ICD-10 Code L63.9 – Alopecia areata, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L63.9 – Alopecia areata, unspecified
What it is
L63.9 identifies alopecia areata when the chart does not specify a subtype or extent. It refers to patchy, non-scarring hair loss of autoimmune origin, documented without further detail.
Clinical signs
Typical findings include smooth, round, or oval areas of hair loss on the scalp or other hair-bearing skin. Clinical features vary; refer to documentation if the record does not clearly describe the pattern.
When to use this code
Use L63.9 when the provider documents alopecia areata but does not name a specific form such as ophiasis or totalis. It also fits when the note confirms hair loss consistent with alopecia areata and no more specific code is supported. Check documentation if the diagnosis is uncertain or another cause of hair loss is recorded.
Do not use for
Do not use this code for nonscarring hair loss from other causes, such as androgenetic alopecia or telogen effluvium. Avoid it when the record specifies a different alopecia areata subtype.
Coding tip
If the note says only “alopecia” or “hair loss,” confirm that alopecia areata is actually documented before assigning L63.9.