ICD-10 Code L73.9 – Follicular disorder, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L73.9 – Follicular disorder, unspecified
What it is
L73.9 identifies a disorder of the hair follicles that is not further specified in the chart. Use it when the record confirms a follicular condition but does not name a more exact diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Follicular disorders may present with follicle-centered bumps, inflammation, irritation, or abnormal hair growth patterns, but you should not assume a specific subtype without provider detail.
When to use this code
Use L73.9 when the clinician documents a follicular disorder and no more specific code is supported. It is appropriate when the note describes follicular involvement but does not identify acne, cyst, infection, or another named condition. Check documentation carefully before assigning it.
Do not use for
Do not use this code when the record supports a more specific follicular diagnosis. Exclude cases where the provider documents a clearly named skin lesion, infection, cyst, or other distinct disorder.
Coding tip
If the description is vague, query for the exact follicular diagnosis before defaulting to L73.9.