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ICD-10-CM 2027 diagnosis code

Z51Encounter for other aftercare and medical care

Not billable — use a more specific code

Z51 is a header code, so it can't be reported by itself. Choose one of the 6 more specific codes beneath it.

Code last changed in FY2017 (effective October 1, 2016). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About Z51

Z51 is the ICD-10-CM diagnosis code for encounter for other aftercare and medical care. It belongs to block Z40-Z53 (Encounters for other specific health care) 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 6 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: Z51.0 (therapy), Z51.1 (immunotherapy), Z51.5 (care), Z51.6 (allergens), Z51.8 (aftercare) and Z51.A (aftercare).

Don't report Z51 together with the conditions in its Excludes1 note: follow-up examination after treatment (Z08-Z09).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2017 (title revised).

Specific codes under Z51

Coding notes

Excludes1Not coded here — never report together with this code
  • follow-up examination after treatment (Z08-Z09)
Code alsoTwo codes may be needed; sequencing depends on circumstances
  • condition requiring care

Notes that apply from higher levels

Instructions written at a parent level also apply to Z51.

Broader instructions also apply from Z40-Z53 Encounters for other specific health care and Chapter 21: Factors influencing health status and contact with health services.

Codes whose notes reference Z51

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
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • FY2017 (effective 10/1/2016): Title revised — was “Encounter for other aftercare”

Common questions about Z51

Is Z51 billable?

No. Z51 is a header code. Report one of its more specific subcodes instead.