ICD-10-CM 2027
ICD-10 code for white blood cell findings
From the official ICD-10-CM alphabetic index entry “Findings, abnormal, inconclusive, without diagnosis › white blood cell (count) (differential) (morphology)”. Page updated September 29, 2026.
About coding white blood cell findings
The ICD-10-CM code for white blood cell findings is D72.9 (Disorder of white blood cells, unspecified).
Within D72, choose D72.9 (Disorder of white blood cells, unspecified) only when documentation doesn't support a more specific option: genetic anomalies of leukocytes (D72.0), eosinophilia (D72.1) and other specified disorders of white blood cells (D72.8).
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 814 (Reticuloendothelial and Immunity Disorders with MCC, relative weight 2.0729), DRG 815 (Reticuloendothelial and Immunity Disorders with CC, relative weight 1.0444) and DRG 816 (Reticuloendothelial and Immunity Disorders without CC/MCC, relative weight 0.7381), 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 white blood cell findings ICD-10 codes
What is the ICD-10 code for white blood cell findings?
- D72.9 — Disorder of white blood cells, unspecified.
Is D72.9 billable?
- Yes. D72.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can D72.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict D72.9 as a principal diagnosis.
Is D72.9 a CC or MCC?
- No. D72.9 is neither a CC nor an MCC under MS-DRG v44.0.