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ICD-10-CM 2027 diagnosis code

I34Nonrheumatic mitral valve disorders

Not billable — use a more specific code

I34 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 I34

I34 is the ICD-10-CM diagnosis code for nonrheumatic mitral valve disorders. It belongs to block I30-I5A (other forms of heart disease) 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: I34.0 (insufficiency), I34.1 (prolapse), I34.2 (stenosis), I34.8 (disorders) and I34.9 (unspecified).

Don't report I34 together with the conditions in its Excludes1 note: mitral valve disease (I05.9), mitral valve failure (I05.8), mitral valve stenosis (I05.0), mitral valve disorder of unspecified cause with diseases of aortic and/or tricuspid valve(s) (I08.-) and 3 more.

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 I34

Coding notes

Excludes1Not coded here — never report together with this code
  • mitral valve disease (I05.9)
  • mitral valve failure (I05.8)
  • mitral valve stenosis (I05.0)
  • mitral valve disorder of unspecified cause with diseases of aortic and/or tricuspid valve(s) (I08.-)
  • mitral valve disorder of unspecified cause with mitral stenosis or obstruction (I05.0)
  • mitral valve disorder specified as congenital (Q23.2, Q23.9)
  • mitral valve disorder specified as rheumatic (I05.-)

Notes that apply from higher levels

Instructions written at a parent level also apply to I34.

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

Codes whose notes reference I34

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 I34

Is I34 billable?

No. I34 is a header code. Report one of its more specific subcodes instead.