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Dx

ICD-10-CM 2027 diagnosis code

Z67.A2Duffy a positive

✓ Billable / specificPOA exemptNot a principal dx

Z67.A2 is a valid, billable ICD-10-CM code for duffy a positive. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code last changed in FY2025 (effective October 1, 2024). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About Z67.A2

Z67.A2 is the ICD-10-CM diagnosis code for Duffy a positive. It belongs to category Z67 (blood type), block Z67 (blood type) and chapter 21 (factors influencing health status and contact with health services). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within Z67.A (Duffy phenotype), Z67.A2 is specifically for Duffy a positive. Related codes cover null (Z67.A1), b positive (Z67.A3) and a and b positive (Z67.A4).

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 951 (Other Factors Influencing Health Status, relative weight 0.5577), 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.

It is not acceptable as the principal diagnosis for an inpatient stay; it may be reported as a secondary diagnosis.

It is exempt from present-on-admission (POA) reporting, so no POA indicator is required.

It was added in FY2025, effective October 1, 2024.

Coding notes

Applicable toConditions and synonyms classified to this code
  • Duffy phenotype Fy(a+b-)

Notes that apply from higher levels

Instructions written at a parent level also apply to Z67.A2.

Broader instructions also apply from Chapter 21: Factors influencing health status and contact with health services.

Alphabetic index entries

2 entries

Terms in the official ICD-10-CM index that lead to Z67.A2.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

MDC 23 · Factors Influencing Health Status and Other Contacts with Health Services

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2025 (effective 10/1/2024): Added
  • No changes since FY2025.

Common questions about Z67.A2

Is Z67.A2 billable?

Yes. Z67.A2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can Z67.A2 be used as a principal diagnosis?

No. It is not acceptable as the principal diagnosis for an inpatient stay; it may be reported as a secondary diagnosis.

Is Z67.A2 a CC or MCC?

No. Z67.A2 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does Z67.A2 group to?

Z67.A2 is used in the MS-DRG v44.0 logic for MS-DRG 951 (Other Factors Influencing Health Status). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.