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ICD-10-CM 2027 diagnosis code

Z67.ADuffy phenotype

Not billable — use a more specific code

Z67.A is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.

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.A

Z67.A is the ICD-10-CM diagnosis code for Duffy phenotype. 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 a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

Within Z67 (blood type), Z67.A is specifically for Duffy phenotype. Related codes cover type A blood (Z67.1), type B blood (Z67.2), type AB blood (Z67.3), type O blood (Z67.4) and unspecified blood type (Z67.9).

To report this condition, pick the subcode that matches the documentation: Z67.A1 (null), Z67.A2 (positive), Z67.A3 (positive) and Z67.A4 (positive).

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

Specific codes under Z67.A

Notes that apply from higher levels

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

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

Is Z67.A billable?

No. Z67.A is a header code. Report one of its more specific subcodes instead.