ICD-10 Code C93.91 – Monocytic leukemia, unspecified in remission (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C93.91 – Monocytic leukemia, unspecified in remission
What it is
This code identifies a history of monocytic leukemia that is currently in remission. You use it when the disease is documented as inactive, but the specific monocytic leukemia type remains unspecified.
Clinical signs
Clinical features vary; refer to documentation. In remission, active leukemia findings are absent or improved, and the record should support that the malignancy is no longer being treated as active disease.
When to use this code
Use C93.91 when the provider documents monocytic leukemia in remission and does not specify a more exact subtype. It is appropriate for follow-up visits, surveillance, or encounters where the leukemia remains part of the patient’s past or ongoing cancer history. Check documentation if remission status is unclear.
Do not use for
Do not use this code for active monocytic leukemia or when the chart says “suspected” or “rule out.” If a more specific leukemia subtype is documented, code that specific diagnosis instead.
Coding tip
Confirm both “in remission” and “unspecified” wording in the provider note before assigning C93.91.