R71.0 Precipitous drop in hematocrit

ICD-10-CM R71.0: Precipitous drop in hematocrit

ICD-10-CM code R71.0 identifies a precipitous drop in hematocrit, functioning as an active diagnosis or health-status concept. This terminology record is situated within the broader category of red blood cell abnormalities. The available public sources establish the code's official label, structural hierarchy, and historical mapping. 1 3

Plain-language overview

ICD-10-CM code R71.0 carries the official display label of precipitous drop in hematocrit, representing a recognized abnormal finding regarding red blood cell volume. 1

The R71.0 terminology record includes the published abbreviation of precipitous drop in hematocrit, matching the preferred name exactly for this specific clinical concept. 1

What this code represents

The concept R71.0 is classified under the semantic types of Disease or Syndrome, Finding, and Sign or Symptom within the ICD-10-CM version 2026 terminology. 1

In the ICD-10-CM hierarchy, R71.0 is a narrower concept of the parent code R71, which encompasses abnormalities of red blood cells, and it currently holds an active status. 1

Coding details

The terminology record for R71.0 indicates it has narrower concepts within the ICD-10-CM system, and it is associated with the historical code 790.01 from MTHICD9. 1 3

Documentation considerations

The terminology record for R71.0 establishes the preferred name of precipitous drop in hematocrit, providing the exact clinical text that corresponds to this specific diagnosis code. 1

What the sources add

While one source details the hierarchical and semantic classification of R71.0, another source maps this exact concept to its corresponding historical ICD-9-CM code. 1 3

A separate clinical report mentions a precipitous drop in blood pressure, but this distinct event does not define or support the hematocrit-specific meaning of code R71.0. 2

Coverage and utilization context

The code R71.0 is accessible for lookup within a clinical reference application available across mobile and web platforms, without establishing any specific billing or utilization rules. 4

Sources

1. ICD-10-CM R71.0 terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Adverse Events in Hospitals: A Quarter of Medicare Patients ... — collections.nlm.nih.gov; accessed 2026-07-27.
3. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-27.
4. R71.0 - Precipitous drop in hematocrit | ICD-10-CM — unboundmedicine.com; accessed 2026-07-27.