ICD-10 Code C88.91 – Malignant immunoproliferative disease, unspecified, in remission (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C88.91 – Malignant immunoproliferative disease, unspecified, in remission
What it is
C88.91 identifies a malignant immunoproliferative disorder that is currently in remission. Use it when the record states the condition is inactive or responding, but the specific subtype is not named.
Clinical signs
Clinical features vary; refer to documentation. Prior records may show findings consistent with an immunoproliferative malignancy, but this code itself reflects remission rather than active disease.
When to use this code
Use this code when the provider documents malignant immunoproliferative disease, unspecified, and explicitly notes remission. It is appropriate for follow-up visits, surveillance encounters, or histories where the malignancy remains under monitoring. If the chart does not confirm remission, check documentation before coding.
Do not use for
Do not use C88.91 for active disease, relapse, or a more specific immunoproliferative diagnosis that is documented elsewhere. Do not assume remission from treatment history alone.
Coding tip
Code remission only when the provider clearly states it; otherwise, query for clarification.