ICD-10-CM 2027
ICD-10 code for Piedraia hortae infection
From the official ICD-10-CM alphabetic index entry “Infection, infected, infective (opportunistic) › Piedraia hortae”. Page updated September 29, 2026.
About coding Piedraia hortae infection
The ICD-10-CM code for Piedraia hortae infection is B36.3 (Black piedra).
Within B36 (other superficial mycoses), B36.3 is specifically for black piedra. Related codes cover pityriasis versicolor (B36.0), tinea nigra (B36.1), white piedra (B36.2), other specified superficial mycoses (B36.8) and superficial mycosis, unspecified (B36.9).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 606 (Minor Skin Disorders with MCC, relative weight 1.5728) and DRG 607 (Minor Skin Disorders without MCC, relative weight 0.8772), in MDC 09 (Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about Piedraia hortae infection ICD-10 codes
What is the ICD-10 code for Piedraia hortae infection?
- B36.3 — Black piedra.
Is B36.3 billable?
- Yes. B36.3 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can B36.3 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict B36.3 as a principal diagnosis.
Is B36.3 a CC or MCC?
- No. B36.3 is neither a CC nor an MCC under MS-DRG v44.0.