ICD-10-CM 2027
ICD-10 code for Reticulocytosis
From the official ICD-10-CM alphabetic index entry “Reticulocytosis”. Page updated September 29, 2026.
About coding Reticulocytosis
The ICD-10-CM code for Reticulocytosis is R70.1 (Abnormal plasma viscosity).
Within R70 (elevated erythrocyte sedimentation rate and abnormality of plasma viscosity), R70.1 is specifically for abnormal plasma viscosity. Related codes cover elevated erythrocyte sedimentation rate (R70.0).
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 947 (Signs and Symptoms with MCC, relative weight 1.261) and DRG 948 (Signs and Symptoms without MCC, relative weight 0.7835), in MDC 23 (Factors Influencing Health Status and Other Contacts with Health Services), 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 Reticulocytosis ICD-10 codes
What is the ICD-10 code for Reticulocytosis?
- R70.1 — Abnormal plasma viscosity.
Is R70.1 billable?
- Yes. R70.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can R70.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict R70.1 as a principal diagnosis.
Is R70.1 a CC or MCC?
- No. R70.1 is neither a CC nor an MCC under MS-DRG v44.0.