C95.90

HCC Category Mapping

What This Code Means

A type of blood cancer (leukemia) where the specific cell type is unknown and the cancer has not responded to treatment or gone into remission.

Coding Tips

• •Use this code when leukemia type is unspecified and documentation does not indicate remission status
• •Verify with oncology documentation whether remission status is known before assigning this code versus C95.91 or C95.92

Clinical Significance

Leukemia, unspecified, not having achieved remission is the least specific leukemia code, used when neither the cell type nor the acute/chronic distinction can be determined. This code represents a significant documentation gap and should prompt immediate efforts to obtain diagnostic specificity.

Documentation Requirements

• ✓Documentation should explain why the leukemia remains completely unspecified and what diagnostic workup has been performed or is pending.
• ✓Peripheral blood and bone marrow findings, even if preliminary, should be documented.
• ✓Treatment initiated without definitive diagnosis and response status should be recorded.

Commonly Confused Codes