ICD-10 Code C86.6 – Primary cutaneous CD30-positive T-cell proliferations (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C86.6 – Primary cutaneous CD30-positive T-cell proliferations
What it is
C86.6 identifies a group of skin-limited T-cell lymphoproliferative disorders that express CD30. Use it when documentation specifies a primary cutaneous CD30-positive T-cell proliferation rather than a systemic lymphoma.
Clinical signs
Clinical features vary; refer to documentation. Commonly noted findings include persistent skin lesions such as papules, nodules, or plaques, with pathology confirming CD30-positive atypical T-cell infiltrates.
When to use this code
Use C86.6 when the provider documents a primary cutaneous CD30-positive T-cell disorder, including related entities such as lymphomatoid papulosis or primary cutaneous anaplastic large cell lymphoma. Code it when the condition is confined to the skin and the diagnosis is established in the record.
Do not use for
Do not use this code for systemic CD30-positive lymphomas with skin involvement or for nonspecific rashes without biopsy-confirmed disease. Check documentation if the record does not clearly state a primary cutaneous CD30-positive process.
Coding tip
Confirm that the note identifies a primary cutaneous CD30-positive disorder and not a secondary skin manifestation before assigning C86.6.