2026 ICD-10-CM Diagnosis Code R71.0Precipitous drop in hematocrit

ICD-10-CM Codes›R00–R99›R70-R79›R71

ICD-10-CM R71.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

R71.0 is a billable ICD-10-CM diagnosis code for precipitous drop in hematocrit. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 811 through 812. As a symptom code, it should not be used as a principal diagnosis once a related definitive diagnosis has been established. Coders also document this condition as hematocrit - PCV level - finding. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Abnormal findings without diagnosis.

Code Identity

ICD-10-CM Code
R71.0
Billable Status
Yes — Valid for Submission
Code Describes
Precipitous drop in hematocrit
Short Description
Precipitous drop in hematocrit
Same as the full description in the CMS dataset.
Parent Code
R71
Abnormality of red blood cells

Code Classification

ChapterR00–R99Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
SectionR70-R79Abnormal findings on examination of blood, without diagnosis
CategoryR71Abnormality of red blood cells
This CodeR71.0Precipitous drop in hematocrit

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Hematocrit - PCV level - finding
  • Hematocrit below reference range
  • Hematocrit outside reference range
  • Hemolytic crisis
  • Precipitous drop in hematocrit

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Drop (precipitous) in hemoglobin
  • Drop in hematocrit

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Decrease(d)
      • hematocrit
    • Decrease(d)
      • hemoglobin
    • Drop(in)
      • hematocrit (precipitous)
    • Drop(in)
      • hemoglobin
    • Findings, abnormal, inconclusive, without diagnosis
      • hematocrit drop (precipitous)

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR SYM017
Abnormal findings without diagnosis
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Blood

Your blood is made up of liquid and solids. The liquid part, called plasma, is made of water, salts, and protein. Over half of your blood is plasma. The solid part of your blood contains red blood cells, white blood cells, and platelets.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert R71.0 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
790.01 Drop, hematocrit, precip
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About R71.0Overview

Is R71.0 (Abnormality of red blood cells) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report precipitous drop in hematocrit on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does R71.0 group to?

When precipitous drop in hematocrit is the principal diagnosis on an inpatient stay, it groups to MS-DRG 811, 812, with relative weights from 0.9182 to 1.4043 depending on complications. Higher weights mean higher Medicare reimbursement.

Can R71.0 be a principal diagnosis?

Use it with care. This is a symptom code, so once a definitive diagnosis explaining the precipitous drop in hematocrit is established, that condition takes the principal position instead.

What is the ICD-9 equivalent of R71.0?

Under the General Equivalence Mappings, precipitous drop in hematocrit converts to ICD-9-CM 790.01 (drop, hematocrit, precip). The mapping is a direct match.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.