L659 - Hair loss without scarring where the specific cause is not identified

International Classification of Diseases

Last updated: 10/3/2025

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 refers to a type of hair loss where hair falls out but doesn't leave scars on the scalp, and the doctor hasn't determined the exact cause. Unlike scarring hair loss where hair follicles are permanently damaged, nonscarring hair loss means the hair follicles are still intact and hair may potentially regrow. This could include conditions like stress-related hair loss, nutritional deficiencies, hormonal changes, or other temporary causes. The 'unspecified' part means additional testing or evaluation may be needed to determine the exact reason for the hair loss.

Additional Information

This is a diagnostic code used when hair loss is present but the specific cause hasn't been determined yet. The good news is that nonscarring hair loss is often treatable once the underlying cause is identified, and hair regrowth is frequently possible since the hair follicles remain undamaged.

Category

Dermatological Condition

Medical Specialty

Dermatology

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

  • Physical examination of scalp and hair
  • Medical history review

What to Expect After

  • Possible blood tests to check for underlying causes
  • Follow-up appointments to monitor hair regrowth
  • Potential referral for additional testing if needed
  • Discussion of treatment options once cause is identified

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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