ICD-10 Codes Explained
International Classification of Diseases codes for diagnoses and conditions. Understand what each diagnosis code means on your medical bills.
Showing 50 of 299 ICD-10 codes
D23112Benign (non-cancerous) mole or skin growth on the eyelid
This code refers to a benign nevus, which is a non-cancerous mole or pigmented skin growth located on the eyelid. These are common, harmless skin lesions that contain clusters of pigment-producing cells called melanocytes. While they are typically not dangerous, eyelid nevi may be monitored or removed for cosmetic reasons, if they interfere with vision, or if there are any changes in appearance that warrant evaluation. An ophthalmologist or dermatologist can assess whether any treatment is needed.
L820Inflamed seborrheic keratosis - a common, non-cancerous skin growth that has become irritated or inflamed
Seborrheic keratoses are very common, benign (non-cancerous) skin growths that appear as brown, black, or tan patches on the skin. They often look waxy, scaly, or slightly raised and are sometimes called 'barnacles' because of their appearance. When these growths become inflamed, they may appear red, swollen, tender, or irritated. This inflammation can occur from friction (like clothing rubbing against them), scratching, or other minor trauma. While seborrheic keratoses are harmless, inflamed ones may be uncomfortable and should be evaluated by a healthcare provider to confirm the diagnosis and discuss treatment options if needed.
Z1389Routine screening visit to check for a specific health condition
This code is used when you visit your doctor for preventive screening to check for a particular health disorder or condition, even though you don't currently have symptoms. This is different from a diagnostic visit where you're being examined because of symptoms you're experiencing. Screening visits are proactive healthcare measures designed to catch potential health issues early, when they're most treatable. The specific disorder being screened for would be documented elsewhere in your medical record. This type of visit is typically part of routine preventive care and may be covered by insurance as a preventive service.
R9720Blood test showing higher than normal levels of PSA, a protein made by the prostate gland
This code indicates that a blood test called PSA (Prostate Specific Antigen) showed levels higher than the normal range. PSA is a protein produced by cells in the prostate gland, and small amounts normally circulate in the blood. Elevated PSA levels can have several causes, including prostate cancer, benign prostate enlargement (BPH), prostate infection, recent medical procedures involving the prostate, or even vigorous physical activity. An elevated PSA doesn't automatically mean cancer - it's a screening tool that helps doctors determine if further testing is needed. Your doctor will consider your PSA level along with other factors like your age, family history, and physical exam results to decide on next steps.
Q249A birth defect affecting the heart's structure that hasn't been specifically identified
This code indicates that a person was born with a heart defect, but the specific type of defect hasn't been determined or specified in the medical records. Congenital heart defects are structural problems with the heart that are present from birth. They can affect the heart's walls, valves, or blood vessels. The term 'unspecified' means that while doctors know there is a heart malformation, they either haven't identified the exact type yet or the medical documentation doesn't include those specific details. These conditions can range from very mild defects that may never cause problems to more serious ones that require ongoing medical care or treatment.
F319Bipolar disorder diagnosis without specific subtype identified
This code indicates a diagnosis of bipolar disorder, a mental health condition that causes unusual shifts in mood, energy, and activity levels. People with bipolar disorder experience periods of unusually intense emotion, changes in sleep patterns and activity levels, and uncharacteristic behaviors. These distinct periods are called 'mood episodes.' The 'unspecified' designation means that while bipolar disorder has been diagnosed, the specific type (such as Bipolar I or Bipolar II) has not been determined or documented at this time. This might be used during initial evaluation or when there isn't enough information yet to specify the exact subtype.
M5450Low back pain
This code represents low back pain, which is pain located in the lower portion of your back (lumbar region). This is a very common condition that can range from mild discomfort to severe pain that affects your daily activities. The pain may be caused by muscle strain, ligament sprain, disc problems, arthritis, or other spine-related issues. It can be acute (sudden onset, short-term) or chronic (long-lasting). The pain might stay in one spot or spread to your buttocks, hips, or legs.
M4134Curved spine (scoliosis) in the chest area caused by chest/lung problems
Thoracogenic scoliosis is a sideways curvature of the spine in the chest (thoracic) region that develops as a result of problems with the chest cavity, lungs, or surrounding tissues. Unlike other types of scoliosis that may have unknown causes, this specific type occurs when chest or lung conditions cause the spine to curve abnormally. The curvature typically develops as the body tries to compensate for underlying chest or respiratory issues. This condition affects the middle portion of the spine where the ribs attach, and may impact breathing, posture, and overall spinal alignment.
L4050Joint inflammation and skin condition caused by psoriatic arthritis, type not specified
Arthropathic psoriasis is a condition where you have both psoriasis (a skin condition that causes red, scaly patches) and arthritis (joint inflammation and pain) occurring together. This is also known as psoriatic arthritis. The 'unspecified' part means the doctor hasn't identified which specific type or pattern of psoriatic arthritis you have. This condition can affect various joints in your body, causing pain, stiffness, and swelling, while also causing skin symptoms. It's an autoimmune condition where your immune system mistakenly attacks healthy joints and skin tissue.
N3010Chronic bladder wall inflammation without blood in urine
Interstitial cystitis is a chronic condition where the bladder wall becomes inflamed and irritated. This causes symptoms like frequent urination, urgent need to urinate, and pelvic pain or pressure. The 'without hematuria' part means there is no visible blood in the urine. This is a long-term condition that can significantly impact quality of life, but it can be managed with various treatments including dietary changes, medications, and sometimes procedures to help reduce bladder inflammation and pain.
R319Blood in urine of unknown cause
Hematuria means there is blood present in your urine, which can make it appear pink, red, or brown. 'Unspecified' means your doctor has detected blood in your urine but hasn't yet determined the specific cause. This can happen for many reasons, ranging from minor issues like urinary tract infections or kidney stones to more serious conditions. The blood might be visible to you, or it might only be detected through laboratory testing. Your healthcare provider will likely want to do additional tests to find out why there's blood in your urine and determine the best treatment approach.
M65342Trigger finger condition affecting the left ring finger
Trigger finger is a condition where your left ring finger gets stuck in a bent position and may snap straight like pulling and releasing a trigger. This happens when the tendon that bends your finger becomes inflamed or irritated, making it difficult to move smoothly through the tunnel-like sheath that surrounds it. You may experience pain, stiffness, a catching sensation, or a popping sound when trying to straighten your finger. The finger may also feel locked in a bent position, especially in the morning.
J45909Asthma without complications or specific type identified
This code indicates you have asthma, but the specific type hasn't been determined and you're not currently experiencing severe complications. Asthma is a chronic condition where your airways become inflamed and narrow, making it harder to breathe. 'Uncomplicated' means you don't have additional serious issues like respiratory failure or severe attacks requiring emergency care. This is often used when asthma is newly diagnosed or when the exact subtype (like allergic or non-allergic asthma) hasn't been specified yet.
D6851A blood clotting disorder that increases the risk of developing blood clots
Activated Protein C Resistance is a genetic condition where your blood doesn't respond properly to a natural protein (Protein C) that helps prevent blood clots. This means your blood has a higher tendency to form clots than normal. The most common cause is a genetic variation called Factor V Leiden. People with this condition have an increased risk of developing blood clots in their veins, particularly in the legs (deep vein thrombosis) or lungs (pulmonary embolism). The condition is usually discovered through blood tests, often after someone has had a blood clot or during screening if there's a family history of clotting disorders.
Z136Routine heart health screening visit
This code represents a preventive healthcare visit specifically for screening to check for heart and blood vessel problems before symptoms appear. During this type of encounter, your healthcare provider will evaluate your cardiovascular health through various tests and examinations. The goal is to detect potential heart conditions early, when they're most treatable. This is typically part of routine preventive care and may include tests like blood pressure measurements, cholesterol checks, EKGs (heart rhythm tests), or other cardiovascular assessments based on your age, risk factors, and medical history.
F17210Nicotine addiction from cigarette smoking without other complications
This code indicates that you have been diagnosed with nicotine dependence specifically from cigarette smoking. Nicotine dependence means your body has become physically and psychologically dependent on nicotine, making it difficult to quit smoking without experiencing withdrawal symptoms. The 'uncomplicated' part means that at this time, there are no additional smoking-related health problems or complications documented alongside the addiction itself. This diagnosis is often used when healthcare providers are documenting smoking cessation efforts, prescribing quit-smoking medications, or referring patients to smoking cessation programs.
K219Acid reflux disease without damage to the esophagus lining
This code refers to gastroesophageal reflux disease (GERD), a condition where stomach acid regularly flows back up into the tube connecting your mouth and stomach (esophagus). In this case, the acid reflux is occurring but has not yet caused visible inflammation or damage to the esophageal lining. Common symptoms include heartburn, regurgitation of food or sour liquid, difficulty swallowing, and chest pain. While uncomfortable, this form of GERD is generally manageable with lifestyle changes and medications.
R0789Chest pain not related to heart problems or other specific causes
This code is used when you experience chest pain that doesn't fit into other specific categories like heart-related chest pain, lung problems, or muscle strain. It covers various types of chest discomfort that may come from different sources such as digestive issues, anxiety, or other non-cardiac causes. Your doctor uses this code when they need to document chest pain symptoms while they work to determine the exact cause or when the pain doesn't match typical patterns of serious conditions.
G932Increased pressure inside the skull without a dangerous underlying cause
Benign intracranial hypertension, also called idiopathic intracranial hypertension or pseudotumor cerebri, is a condition where there is increased pressure of the fluid surrounding your brain and spinal cord. Despite the name 'benign,' this condition requires medical attention as it can cause headaches, vision problems, and other symptoms. The pressure increase mimics what would happen with a brain tumor, but no tumor or other serious underlying cause is present. Common symptoms include severe headaches, vision changes, ringing in the ears, and sometimes nausea. The condition is more common in women of childbearing age and those who are overweight, though it can affect anyone.
H9392Unspecified problem with the left ear
This code indicates that you have some type of disorder or problem affecting your left ear, but the specific condition hasn't been identified or documented in detail yet. This is often used when you're experiencing ear-related symptoms like pain, hearing changes, discharge, or discomfort, but further examination or testing is needed to determine the exact cause. It's a general code that doctors use when they know something is wrong with your left ear but need more information to make a specific diagnosis.
R519Headache, unspecified type
This code indicates you experienced a headache, but the specific type or cause wasn't determined or documented during your visit. Headaches are very common and can have many different causes, ranging from stress, dehydration, or lack of sleep to more specific medical conditions. Since this is coded as 'unspecified,' it means your healthcare provider documented that you had head pain but didn't identify it as a particular type of headache (like migraine, tension headache, or cluster headache). This could be because it was a one-time occurrence, the pattern wasn't clear yet, or additional evaluation might be needed to determine the specific type.
H16141Small spots of inflammation on the clear front part of the right eye
Punctate keratitis is a condition where small, dot-like areas of inflammation develop on the cornea (the clear, dome-shaped front surface of your right eye). These tiny spots can cause symptoms like eye pain, sensitivity to light, tearing, and blurred vision. The condition can be caused by various factors including dry eyes, infections (viral, bacterial, or fungal), allergies, contact lens problems, or exposure to irritants. While it sounds concerning, punctate keratitis is often treatable and many cases resolve with proper care.
H5789Other hearing loss in both ears
This code indicates that you have hearing loss affecting both of your ears, but it's a type that doesn't fit into the more specific categories of hearing loss that doctors typically diagnose. This could include mixed hearing loss (combination of different types), hearing loss from multiple causes, or other less common forms of hearing impairment. The hearing loss may range from mild to severe and can affect your ability to hear conversations, sounds in your environment, or specific frequencies of sound.
G90AIdiopathic peripheral autonomic neuropathy - nerve damage affecting automatic body functions
This code refers to a condition where the peripheral autonomic nervous system is damaged, but the cause is unknown (idiopathic). The autonomic nervous system controls automatic body functions like heart rate, blood pressure, digestion, and temperature regulation. When these nerves are damaged, it can affect how your body automatically manages these vital functions. Symptoms might include problems with blood pressure regulation (especially when standing up), digestive issues, temperature control problems, or heart rate irregularities. Since it's 'idiopathic,' doctors haven't been able to identify a specific underlying cause for the nerve damage.
N3001Sudden bladder infection with blood in urine
Acute cystitis with hematuria is a sudden inflammation or infection of the bladder that causes blood to appear in the urine. This condition typically develops quickly and causes symptoms like painful urination, frequent urination, urgency to urinate, and visible blood in the urine (which may appear pink, red, or cola-colored). The blood in urine (hematuria) distinguishes this from regular bladder infections. This condition is usually caused by bacterial infection, though other factors like irritation or inflammation can contribute. While concerning due to the blood in urine, it's generally treatable with appropriate medical care.
D3131Non-cancerous growth in the right choroid (blood vessel layer of the eye)
This code indicates a benign (non-cancerous) tumor or growth in the choroid of your right eye. The choroid is a layer of blood vessels located between the retina (the light-sensitive layer at the back of your eye) and the sclera (the white outer wall of your eye). This layer helps nourish the retina and maintain eye health. A benign neoplasm means the growth is not cancerous and typically does not spread to other parts of the body. However, depending on its size and location, it may still require monitoring or treatment to prevent vision problems or other complications.
H04129Dry eye syndrome affecting the tear-producing glands
Dry eye syndrome is a common condition where your eyes don't produce enough tears or the tears evaporate too quickly, leading to eye discomfort and irritation. This specific code indicates that the condition affects your lacrimal glands (the glands that produce tears), but doesn't specify which particular gland is involved. Symptoms typically include eye dryness, burning, stinging, scratchy feeling, sensitivity to light, and sometimes blurred vision. The condition can be caused by aging, certain medications, medical conditions, environmental factors, or problems with the tear-producing glands themselves.
A6920Lyme disease diagnosis without specific details about the stage or complications
This code indicates you have been diagnosed with Lyme disease, but the specific stage or type hasn't been specified in your medical records. Lyme disease is an infection caused by bacteria transmitted through tick bites, most commonly from deer ticks. Symptoms can include fever, headache, fatigue, and a characteristic skin rash that looks like a bull's-eye. If left untreated, the infection can spread to joints, the heart, and the nervous system. The 'unspecified' designation means your healthcare provider has confirmed Lyme disease but hasn't documented whether it's early-stage, late-stage, or which specific complications may be present.
R5382Ongoing tiredness and exhaustion that doesn't improve with rest
Chronic fatigue, unspecified refers to persistent, overwhelming tiredness that lasts for months and doesn't get better with rest or sleep. This condition goes beyond normal tiredness - it can make daily activities very difficult and may be accompanied by other symptoms like muscle pain, difficulty concentrating, or sleep problems. The 'unspecified' part means the exact cause or type of chronic fatigue hasn't been determined yet. This code is used when you're receiving home health services to help manage your symptoms and improve your daily functioning.
V4352XACar driver injured in a car-to-car collision on a public road - initial medical visit
This code indicates that you were the driver of a car that was involved in a collision with another car on a public road or highway, and this is your first medical visit for injuries from that accident. This is an external cause code that helps healthcare providers and insurance companies understand how your injury occurred. It's used alongside other codes that describe your specific injuries (like broken bones, cuts, or bruises). The code helps track traffic accident patterns and ensures proper documentation for insurance and legal purposes.
R3915Sudden, strong urge to urinate that's difficult to control
Urinary urgency means you experience a sudden, intense need to urinate that feels difficult to delay or control. This can happen even when your bladder isn't completely full. You might feel like you need to rush to the bathroom immediately, and the sensation can be uncomfortable or distressing. This condition can occur on its own or as part of other bladder or urinary tract conditions. It's different from simply needing to urinate frequently - it's specifically about the intensity and suddenness of the urge.
B9689Other bacterial infection causing illness in another part of the body
This code indicates that a bacterial infection (caused by bacteria other than the most common types) is the underlying cause of a disease or condition affecting another part of your body. This is what doctors call a 'secondary code' - it helps explain what caused your main health problem. For example, if you have pneumonia caused by an unusual type of bacteria, this code would identify that specific bacterial cause. The bacteria involved are less common ones that don't have their own specific codes in the medical coding system.
R350Frequent urination - needing to urinate more often than normal
This code indicates that you are experiencing urinary frequency, which means you need to urinate more often than what is considered normal for you. Normal urination frequency is typically 4-8 times per day, but this can vary from person to person. Frequent urination can be caused by various factors including urinary tract infections, bladder conditions, diabetes, medications, excessive fluid intake, or other medical conditions. Your healthcare provider will likely want to determine the underlying cause of your frequent urination through additional tests or evaluation.
R1310Difficulty swallowing food or liquids
Dysphagia is a medical term that describes difficulty or discomfort when swallowing food, liquids, or even saliva. This can feel like food getting stuck in your throat or chest, pain when swallowing, or the sensation that swallowing requires extra effort. The 'unspecified' designation means the exact cause or type of swallowing difficulty hasn't been determined yet. Dysphagia can range from mild discomfort to a serious condition that affects nutrition and safety, as it may increase the risk of choking or food entering the lungs. Common causes include muscle weakness, nerve problems, structural abnormalities, or conditions affecting the esophagus.
Z79890Long-term use of hormone replacement therapy (HRT)
This code indicates that you are currently taking hormone replacement therapy on a long-term basis. Hormone replacement therapy involves taking medications that contain hormones to replace those that your body no longer produces adequately. This is commonly prescribed for conditions like menopause, where estrogen and progesterone levels drop, or for other hormonal deficiencies. The code is used to document your ongoing HRT treatment in your medical records, which helps healthcare providers coordinate your care and be aware of potential interactions with other medications or treatments.
H5210Nearsightedness (myopia) - difficulty seeing distant objects clearly
Myopia, commonly known as nearsightedness, is a vision condition where you can see objects close to you clearly, but objects farther away appear blurry. This happens when your eye is slightly longer than normal or your cornea (the clear front part of your eye) is too curved, causing light to focus in front of your retina instead of directly on it. This code indicates myopia without specifying which eye is affected or the severity level. It's a very common vision problem that typically develops during childhood or teenage years and can be easily corrected with glasses, contact lenses, or refractive surgery.
H6592Ear infection in the left ear without pus formation
This code indicates an ear infection in your left ear that doesn't involve pus or discharge. 'Nonsuppurative' means there's no pus formation, and 'otitis media' refers to inflammation or infection of the middle ear - the space behind your eardrum. This type of ear infection typically causes symptoms like ear pain, feeling of fullness, hearing difficulties, or pressure in the ear. The 'unspecified' part means the exact type or cause of the infection wasn't detailed in your medical record, but it's still a treatable condition that commonly affects both children and adults.
Z8619Personal history of other infectious or parasitic diseases
This code indicates that you have a documented history of having an infectious or parasitic disease that doesn't fall into the more specific categories covered by other codes. This could include various bacterial, viral, fungal, or parasitic infections you've had in the past that are now resolved but remain part of your medical record. Healthcare providers use this information to understand your complete health history, which can be important for future care decisions, risk assessments, or when prescribing medications. The infection itself is no longer active, but the history may be relevant for your ongoing healthcare.
Z91041Medical record notation indicating a known allergy to contrast dye used in medical imaging
This code is used in your medical records to document that you have a known allergy to radiographic contrast dye (also called contrast material or dye). This is the special liquid that is sometimes given before CT scans, MRIs, or other imaging tests to help make certain body parts show up more clearly in the pictures. Having this code in your medical record is important because it alerts all healthcare providers that you cannot safely receive standard contrast dye and may need special preparations, alternative contrast materials, or different imaging approaches. This is a safety measure to prevent allergic reactions during future medical procedures.
R945Blood test results showing your liver isn't working normally
This code means that blood tests checking how well your liver is working came back with abnormal results. Your liver performs many important jobs like filtering toxins from your blood, making proteins, and helping with digestion. When liver function tests are abnormal, it could indicate various conditions ranging from minor issues like medication effects or temporary inflammation to more serious liver problems. The abnormal results don't tell us exactly what's wrong - they're like a warning light that tells your doctor your liver needs more investigation. Your healthcare provider will likely want to do additional tests, review your medications, and possibly repeat the tests to determine what's causing the abnormal results and whether treatment is needed.
Z888Medical record notation indicating you have allergies to certain medications or biological substances
This code is used by healthcare providers to document in your medical record that you have known allergies to specific drugs, medications, or biological substances (like vaccines or blood products). It's not a diagnosis of a new condition, but rather a way to flag important allergy information in your medical chart. This helps ensure that healthcare providers are aware of your allergies when prescribing treatments or medications. The code covers allergies to drugs and biological substances that aren't specifically listed in other, more detailed allergy codes.
Z6825Body Mass Index (BMI) between 25.0-25.9, indicating you are slightly overweight
This code indicates that your Body Mass Index (BMI) falls between 25.0 and 25.9, which is classified as overweight according to standard medical guidelines. BMI is calculated using your height and weight to assess whether you're at a healthy weight. A BMI in this range means you weigh more than what's considered ideal for your height, but you're not yet in the obese category (which starts at BMI 30). This code is often used in home health services to document your current weight status as part of your overall health assessment and care planning. Your healthcare team may use this information to provide guidance on nutrition, exercise, or other health management strategies.
D61811A serious blood condition where medication has caused dangerously low levels of all blood cell types
Pancytopenia is a condition where your body has dangerously low counts of all three main types of blood cells: red blood cells (which carry oxygen), white blood cells (which fight infection), and platelets (which help blood clot). In this case, the condition was caused by a medication or drug you were taking. This is a serious condition that requires immediate medical attention and hospitalization because it leaves you vulnerable to severe anemia, infections, and bleeding problems. Your doctors will need to identify and stop the medication causing the problem while providing supportive care to manage the low blood counts.
T361X5AAdverse reaction to cephalosporin or beta-lactam antibiotics (first occurrence)
This code indicates that you experienced an unwanted side effect or adverse reaction to a specific type of antibiotic medication called cephalosporins or other beta-lactam antibiotics. These are common antibiotics used to treat bacterial infections. The reaction could include symptoms like allergic reactions, digestive problems, or other side effects. The 'initial encounter' designation means this is the first time this particular adverse reaction is being documented and treated during your hospital stay.
K589Irritable bowel syndrome (IBS) without diarrhea - a digestive condition causing abdominal pain and changes in bowel habits
Irritable bowel syndrome (IBS) without diarrhea is a common digestive disorder that affects the large intestine (colon). This condition causes recurring abdominal pain, cramping, bloating, and changes in bowel movements - but specifically without diarrhea as a main symptom. Instead, patients may experience constipation, normal bowel movements, or alternating patterns. The exact cause isn't fully understood, but it's thought to involve problems with how the gut and brain communicate, changes in gut bacteria, or increased sensitivity in the intestines. While IBS can be uncomfortable and disruptive to daily life, it doesn't cause permanent damage to the intestines or increase the risk of serious diseases like cancer. This diagnosis being used for inpatient services suggests the symptoms may have been severe enough to require hospital evaluation or treatment.
J329Long-term sinus infection or inflammation that has lasted more than 12 weeks
Chronic sinusitis is a condition where the spaces inside your nose and head (called sinuses) remain swollen and inflamed for 12 weeks or longer, despite treatment attempts. This ongoing inflammation can cause symptoms like nasal congestion, facial pressure or pain, reduced sense of smell, and thick nasal discharge. The 'unspecified' part means the exact location of the affected sinuses or the specific cause wasn't identified in your medical record. This is a common condition that can significantly impact quality of life but is generally manageable with proper treatment.
T8069XAAllergic or adverse reaction to a blood serum product (first time treated)
This code indicates that you had an allergic or adverse reaction to a blood serum product that was given to you medically. Blood serum products are treatments made from blood plasma that contain antibodies or other proteins to help fight infections or diseases. The reaction could include symptoms like rash, swelling, difficulty breathing, or other allergic responses. This is coded as your 'initial encounter,' meaning this is the first time you're being treated for this particular reaction. The reaction was caused by a serum product other than the most commonly used ones.
M79602Pain in the left arm
This code indicates that you are experiencing pain specifically in your left arm. The pain could be in any part of your left arm including the shoulder, upper arm, elbow, forearm, wrist, or hand. This is a symptom code that describes what you're feeling rather than identifying the underlying cause of the pain. Your healthcare provider will use this code along with other information to document your complaint and may order additional tests or examinations to determine what's causing the arm pain.
R300Painful or difficult urination
Dysuria is the medical term for experiencing pain, burning, stinging, or discomfort when urinating. This symptom can affect anyone and may feel like a burning sensation, sharp pain, or general discomfort during urination. It's often described as feeling like 'fire' when passing urine. Dysuria is a symptom rather than a disease itself, and can be caused by various conditions including urinary tract infections, bladder infections, kidney stones, sexually transmitted infections, or irritation from soaps, perfumes, or certain medications. While uncomfortable, it's usually treatable once the underlying cause is identified.
T50Z95AInitial treatment for an adverse reaction to a vaccine or biological medicine
This code indicates that you experienced an unwanted side effect or adverse reaction to a vaccine or biological medication, and this is your first visit for treatment of that reaction. Biological substances include vaccines, blood products, and certain medications derived from living organisms. Adverse effects can range from mild reactions like soreness at the injection site to more serious allergic reactions. The 'initial encounter' designation means this is the first time you're receiving medical care specifically for this reaction. Your healthcare team will evaluate your symptoms, provide appropriate treatment, and monitor your recovery.
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