2026 ICD-10-CM Diagnosis Code D71.9Functional disorders of polymorphonuclear neutrophils, unspecified

ICD-10-CM Codes›D50–D89›D70-D77›D71

ICD-10-CM D71.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

D71.9 is a billable ICD-10-CM diagnosis code for functional disorders of polymorphonuclear neutrophils, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 808 through 810. Coders also document this condition as functional disorder of polymorphonuclear neutrophil.

Code Identity

ICD-10-CM Code
D71.9
Billable Status
Yes — Valid for Submission
Code Describes
Functional disorders of polymorphonuclear neutrophils, unspecified
Short Description
Functional disorders of polymorphonuclear neutrophils, unsp
Parent Code
D71
Functional disorders of polymorphonuclear neutrophils

Code Classification

ChapterD50–D89Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism
SectionD70-D77Other disorders of blood and blood-forming organs
CategoryD71Functional disorders of polymorphonuclear neutrophils
This CodeD71.9Functional disorders of polymorphonuclear neutrophils, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Functional disorder of polymorphonuclear neutrophil
  • Heritable disorder of neutrophil function

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.

    • Disorder(of)
      • functional polymorphonuclear neutrophils
    • Disorder(of)
      • neutrophil, polymorphonuclear
    • Disorder(of)
      • polymorphonuclear neutrophils

Code History & ChangesHistory

New Code D71.9 was added to the ICD-10-CM code set for FY 2026, effective October 1, 2025.

Replacement D71.9 replaces the following previously assigned code(s):

  • D71 - Functional disorders of polymorphonuclear neutrophils
FY 2026AddedAdded to the ICD-10-CM code setEffective October 1, 2025.
FY 2026CurrentRevised in the current code setEffective October 1, 2025 through September 30, 2026.

Questions About D71.9Overview

Is D71.9 (Functional disorders of polymorphonuclear neutrophils) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report functional disorders of polymorphonuclear neutrophils, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does D71.9 group to?

When functional disorders of polymorphonuclear neutrophils, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 808, 809, 810, with relative weights from 1.0466 to 2.2079 depending on complications. Higher weights mean higher Medicare reimbursement.