ICD-10 Code C84.AA – Cutaneous T-cell lymphoma, unspecified, in remission (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.AA – Cutaneous T-cell lymphoma, unspecified, in remission
What it is
This code identifies a history of cutaneous T-cell lymphoma that is currently in remission, but the specific subtype is not documented. Use it when the chart confirms remission and does not name a more precise CTCL type.
Clinical signs
Clinical features vary; refer to documentation. CTCL commonly presents with skin lesions such as patches, plaques, or tumors, but remission means active disease findings may be absent or minimal at the time of coding.
When to use this code
Use this code when the provider documents cutaneous T-cell lymphoma in remission and does not specify a subtype. It is appropriate for follow-up visits, surveillance, or ongoing care after treatment when the disease is no longer active.
Check documentation if the record mentions recurrent, progressive, or active lymphoma, because those scenarios require a different code. Also verify whether a more specific CTCL subtype is documented elsewhere in the chart.
Do not use for
Do not use this code for active cutaneous T-cell lymphoma or for a different lymphoma subtype. Do not assign it if remission is not documented or if the chart only says “history of lymphoma” without current status.
Coding tip
Confirm both the CTCL diagnosis and the remission status in provider documentation before assigning C84.AA.