ICD-10-CM 2027
ICD-10 code for red blood cell abnormal
From the official ICD-10-CM alphabetic index entry “Abnormal, abnormality, abnormalities › red blood cell (s) (morphology) (volume)”. Page updated September 29, 2026.
About coding red blood cell abnormal
The ICD-10-CM code for red blood cell abnormal is R71.8 (Other abnormality of red blood cells).
Within R71, choose R71.8 (Other abnormality of red blood cells) only when documentation doesn't support a more specific option: Precipitous drop in hematocrit (R71.0).
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 red blood cell abnormal ICD-10 codes
What is the ICD-10 code for red blood cell abnormal?
- R71.8 — Other abnormality of red blood cells.
Is R71.8 billable?
- Yes. R71.8 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can R71.8 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict R71.8 as a principal diagnosis.
Is R71.8 a CC or MCC?
- No. R71.8 is neither a CC nor an MCC under MS-DRG v44.0.