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ICD-10-CM 2027

ICD-10 code for polymorphic reticulosis

C86.0

Extranodal NK/T-cell lymphoma, nasal type

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Reticulosis (skin) › polymorphic”. Page updated September 29, 2026.

About coding polymorphic reticulosis

The ICD-10-CM code for polymorphic reticulosis is C86.0 (Extranodal NK/T-cell lymphoma, nasal type).

Within C86 (other specified types of T/NK-cell lymphoma), C86.0 is specifically for extranodal NK/T-cell lymphoma, nasal type. Related codes cover Hepatosplenic T-cell lymphoma (C86.1), Enteropathy-type (intestinal) T-cell lymphoma (C86.2), subcutaneous panniculitis-like T-cell lymphoma (C86.3), Blastic NK-cell lymphoma (C86.4), Angioimmunoblastic T-cell lymphoma (C86.5) and primary cutaneous CD30-positive T-cell proliferations (C86.6).

To report this condition, pick the subcode that matches the documentation: C86.00 (not having achieved remission) and C86.01 (in remission).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2025 (expanded into subcodes).

Common questions about polymorphic reticulosis ICD-10 codes

What is the ICD-10 code for polymorphic reticulosis?

C86.0 — Extranodal NK/T-cell lymphoma, nasal type (a header code; report a more specific subcode).

Is C86.0 billable?

No. C86.0 is a header code. Report one of its more specific subcodes instead.