R509 - Fever of unknown cause - when you have an elevated body temperature but the specific reason hasn't been identified yet
International Classification of Diseases
What is a ICD-10 Code?
ICD-10 (International Classification of Diseases, 10th Revision) codes are used to classify and code all diagnoses, symptoms, and procedures recorded in association with hospital care. These codes provide a standardized way to track health conditions and their treatment outcomes.
Detailed Description
This code is used when you have a fever (elevated body temperature above normal) but your healthcare provider hasn't yet determined what's causing it. Fever is your body's natural response to infection or illness, but many different conditions can cause fever. During your office visit, your doctor will work to identify the underlying cause through examination, questions about your symptoms, and possibly additional tests. The fever itself is a symptom rather than a specific disease, so finding and treating the root cause is important for your recovery.
Additional Information
This is a symptom code used when fever is present but the underlying cause hasn't been determined. The cost range reflects a typical established patient office visit. Additional diagnostic tests or treatments may incur separate charges.
Category
Symptoms and Signs
Medical Specialty
General Medicine/Primary Care
Expected Costs
We expect this to normally be in the range of:
$150 - $400
This is an estimate based on typical billing patterns. Your actual cost may vary depending on your insurance coverage, provider location, and specific circumstances.
What's Required Before This
- Office visit with established patient
What to Expect After
- Monitor temperature regularly
- Stay hydrated and rest
- Return if fever persists or worsens
- Follow up for additional testing if needed
- Take prescribed medications as directed
Why Understanding This Code Matters
On Your Medical Bill
This code appears on your medical bills to identify the specific service, procedure, drug, or medical diagnosis you received. Understanding what it means helps you verify you're being charged correctly and know what to expect.
For Your Health
Knowing what this code represents helps you understand your treatment plan, ask better questions during appointments, and track your healthcare journey more effectively.
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