ICD-10-CM 2027
ICD-10 code for Oligocythemia
From the official ICD-10-CM alphabetic index entry “Oligocythemia”. Page updated September 29, 2026.
About coding Oligocythemia
The ICD-10-CM code for Oligocythemia is D64.9 (Anemia, unspecified).
Within D64, choose D64.9 (Anemia, unspecified) only when documentation doesn't support a more specific option: hereditary sideroblastic anemia (D64.0), secondary sideroblastic anemia due to disease (D64.1), secondary sideroblastic anemia due to drugs and toxins (D64.2), other sideroblastic anemias (D64.3), congenital dyserythropoietic anemia (D64.4) and other specified anemias (D64.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 811 (Red Blood Cell Disorders with MCC, relative weight 1.3988) and DRG 812 (Red Blood Cell Disorders without MCC, relative weight 0.9234), in MDC 16 (Diseases and Disorders of the Blood and Blood Forming Organs and Immunological Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about Oligocythemia ICD-10 codes
What is the ICD-10 code for Oligocythemia?
- D64.9 — Anemia, unspecified.
Is D64.9 billable?
- Yes. D64.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can D64.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict D64.9 as a principal diagnosis.
Is D64.9 a CC or MCC?
- No. D64.9 is neither a CC nor an MCC under MS-DRG v44.0.