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ICD-10-CM 2027 diagnosis code

I09Other rheumatic heart diseases

Not billable — use a more specific code

I09 is a header code, so it can't be reported by itself. Choose one of the 5 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About I09

I09 is the ICD-10-CM diagnosis code for other rheumatic heart diseases. It belongs to block I05-I09 (chronic rheumatic heart 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 5 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: I09.0 (myocarditis), I09.1 (unspecified), I09.2 (pericarditis), I09.8 (diseases) and I09.9 (unspecified).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under I09

Notes that apply from higher levels

Instructions written at a parent level also apply to I09.

Broader instructions also apply from Chapter 9: Diseases of the circulatory system.

Codes whose notes reference I09

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)
  • No changes since FY2016.

Common questions about I09

Is I09 billable?

No. I09 is a header code. Report one of its more specific subcodes instead.