B36.3
BillableBlack piedra
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is B36.3 an HCC code?
No. B36.3 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
B36.3 is the ICD-10-CM diagnosis code for black piedra. Black piedra is a fungal infection of the hair shaft that causes small, hard, dark nodules or concretions to form on hair strands, typically affecting the scalp and facial hair. It is caused by the fungus Piedraia hortae and is more common in tropical and subtropical regions. B36.3 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering mycoses (b35-b49).
B36.3 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Verify the specific site of infection (scalp, beard, etc.) as this may affect documentation and treatment planning, though B36.3 is the primary code for black piedra regardless of location.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for B36.3 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify the specific site of infection (scalp, beard, etc.) as this may affect documentation and treatment planning, though B36.3 is the primary code for black piedra regardless of location
- •Distinguish black piedra from white piedra (B36.2), which is caused by a different fungus and presents with lighter-colored nodules on the hair shaft