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ICD-10-CM 2027 diagnosis code

F78.AOther genetic related intellectual disabilities

Not billable — use a more specific code

F78.A is a header code, so it can't be reported by itself. Choose one of the 2 more specific codes beneath it.

Code last changed in FY2022 (effective October 1, 2021). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About F78.A

F78.A is the ICD-10-CM diagnosis code for other genetic related intellectual disabilities. It belongs to category F78 (other intellectual disabilities), block F70-F79 (intellectual Disabilities) and chapter 5 (mental, Behavioral and Neurodevelopmental disorders). It is a header code, so it can't be reported by itself; one of its 2 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: F78.A1 (disability) and F78.A9 (disability).

It was added in FY2022, effective October 1, 2021.

Specific codes under F78.A

Notes that apply from higher levels

Instructions written at a parent level also apply to F78.A.

Broader instructions also apply from F70-F79 Intellectual Disabilities and Chapter 5: Mental, Behavioral and Neurodevelopmental disorders.

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
  • FY2022 (effective 10/1/2021): Added
  • No changes since FY2022.

Common questions about F78.A

Is F78.A billable?

No. F78.A is a header code. Report one of its more specific subcodes instead.