2026 ICD-10-CM Diagnosis Code Z67.A2Duffy a positive

ICD-10-CM Codes›Z00–Z99›Z67›Z67

ICD-10-CM Z67.A2
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Z67.A2 is a billable ICD-10-CM diagnosis code for duffy a positive. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is not accepted as a principal diagnosis by the Medicare Code Editor and exempt from POA reporting. Coders also document this condition as duffy blood group phenotype. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified status.

Code Identity

ICD-10-CM Code
Z67.A2
Billable Status
Yes — Valid for Submission
Code Describes
Duffy a positive
Short Description
Duffy a positive
Same as the full description in the CMS dataset.
Parent Code
Z67.A
Duffy phenotype

Code Classification

ChapterZ00–Z99Factors influencing health status and contact with health services
SectionZ67Blood type
CategoryZ67Blood type
This CodeZ67.A2Duffy a positive

Code EditsBilling

Medicare Code Editor checks that affect claim validity for Z67.A2.

Unacceptable principal diagnosis
There are selected codes that describe a circumstance which influences an individual's health status but not a current illness or injury, or codes that are not specific manifestations but may be due to an underlying cause. These codes are considered unacceptable as a principal diagnosis.

Present on Admission (POA)Billing

Z67.A2 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Duffy blood group phenotype
  • Fy phenotype

Tabular List NotesGuidance

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

Inclusion Terms

  • Duffy phenotype Fy(a+b-)

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.

    • Phenotype
      • Duffy
        • a positive
    • Phenotype
      • Duffy
        • Fy (a+b-)

Clinical ClassificationClinical

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

CCSR FAC025
Other specified status
Default principal diagnosis: inpatient No · outpatient Yes

Code HistoryHistory

FY 2025AddedAdded to the ICD-10-CM code setEffective October 1, 2024.
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About Z67.A2Overview

Is Z67.A2 (Duffy phenotype) a billable code?

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

Can Z67.A2 be a principal diagnosis?

No. The Medicare Code Editor rejects this code as a principal diagnosis because duffy a positive describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.

Is Z67.A2 exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for duffy a positive on inpatient claims.