ICD-10 Code B36.0 – Pityriasis versicolor (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B36.0 – Pityriasis versicolor
What it is
B36.0 identifies pityriasis versicolor, a superficial fungal infection of the skin caused by Malassezia species. It usually affects the trunk, neck, or upper arms and produces patchy color changes.
Clinical signs
Look for fine scaling with hypo- or hyperpigmented macules or patches, often on oily skin areas. Clinical features vary; refer to documentation if the appearance or distribution is unclear.
When to use this code
Use B36.0 when the provider documents pityriasis versicolor, tinea versicolor, or a confirmed equivalent diagnosis. Apply it for outpatient or inpatient records when the condition is the reason for evaluation, treatment, or follow-up. If the note only says “rash,” check documentation before coding.
Do not use for
Do not use this code for other fungal skin infections, eczema, or nonspecific pigment changes without a documented diagnosis. If the record does not clearly identify pityriasis versicolor, check documentation.
Coding tip
Code from the clinician’s stated diagnosis, not from skin color changes alone.