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ICD-10-CM 2027 diagnosis code

I1AOther hypertension

Not billable — use a more specific code

I1A is a header code, so it can't be reported by itself. Choose one of the 1 more specific codes beneath it.

Code last changed in FY2024 (effective October 1, 2023). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About I1A

I1A is the ICD-10-CM diagnosis code for other hypertension. It belongs to block I10-I1A (hypertensive diseases) and chapter 9 (diseases of the circulatory system). It is a header code, so it can't be reported by itself; one of its 1 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: I1A.0 (hypertension).

It was added in FY2024, effective October 1, 2023.

Specific codes under I1A

Notes that apply from higher levels

Instructions written at a parent level also apply to I1A.

Broader instructions also apply from I10-I1A Hypertensive diseases and Chapter 9: Diseases of the circulatory system.

Codes whose notes reference I1A

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
  • FY2024 (effective 10/1/2023): Added
  • No changes since FY2024.

Common questions about I1A

Is I1A billable?

No. I1A is a header code. Report one of its more specific subcodes instead.