ICD-10-CM 2027 diagnosis code
R71.8Other abnormality of red blood cells
R71.8 is a valid, billable ICD-10-CM code for other abnormality of red blood cells. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
Looking up by condition? See ICD-10 code for Anisocytosis, ICD-10 code for Poikilocytosis.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About R71.8
R71.8 is the ICD-10-CM diagnosis code for other abnormality of red blood cells. It belongs to category R71 (abnormality of red blood cells), block R70-R79 (abnormal findings on examination of blood, without diagnosis) and chapter 18 (symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
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.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 790.09 (other abnormality of red blood cells).
Coding notes
- Abnormal red-cell morphology NOS
- Abnormal red-cell volume NOS
- Anisocytosis
- Poikilocytosis
Notes that apply from higher levels
Instructions written at a parent level also apply to R71.8.
Alphabetic index entries
6 entriesTerms in the official ICD-10-CM index that lead to R71.8.
- Abnormal, abnormality, abnormalities › red blood cell (s) (morphology) (volume)
- Anisocytosis
- Findings, abnormal, inconclusive, without diagnosis › anisocytosis
- Findings, abnormal, inconclusive, without diagnosis › poikilocytosis
- Findings, abnormal, inconclusive, without diagnosis › red blood cell (count) (morphology) (sickling) (volume)
- Poikilocytosis
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 16 · Diseases and Disorders of the Blood and Blood Forming Organs and Immunological Disorders
ICD-9-CM equivalent
Converter →- 790.09Other abnormality of red blood cellsexact
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about R71.8
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.
What DRG does R71.8 group to?
- R71.8 is used in the MS-DRG v44.0 logic for MS-DRG 811 (Red Blood Cell Disorders with MCC) and MS-DRG 812 (Red Blood Cell Disorders without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for R71.8?
- The CMS General Equivalence Mappings map R71.8 to ICD-9-CM 790.09.