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ICD-10-CM 2027 diagnosis code

I34.8Other nonrheumatic mitral valve disorders

Not billable — use a more specific code

I34.8 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 FY2023 (effective October 1, 2022). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About I34.8

I34.8 is the ICD-10-CM diagnosis code for other nonrheumatic mitral valve disorders. It belongs to category I34 (nonrheumatic mitral valve disorders), 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 2 subcodes must be used instead.

Within I34, choose I34.8 (Other nonrheumatic mitral valve disorders) only when documentation doesn't support a more specific option: nonrheumatic mitral (valve) insufficiency (I34.0), nonrheumatic mitral (valve) prolapse (I34.1), nonrheumatic mitral (valve) stenosis (I34.2) and nonrheumatic mitral valve disorder, unspecified (I34.9).

To report this condition, pick the subcode that matches the documentation: I34.81 (calcification) and I34.89 (disorders).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2023 (expanded into subcodes).

Before ICD-10, this condition was coded in ICD-9-CM as 424.0 (mitral valve disorders).

Specific codes under I34.8

Notes that apply from higher levels

Instructions written at a parent level also apply to I34.8.

› From I34 Nonrheumatic mitral valve disorders
Excludes1
  • 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.-)

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

ICD-9-CM equivalent

Converter →
  • 424.0Mitral valve disordersapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

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)
  • FY2023 (effective 10/1/2022): Expanded — no longer billable

Common questions about I34.8

Is I34.8 billable?

No. I34.8 is a header code. Report one of its more specific subcodes instead.

What is the ICD-9 code for I34.8?

The CMS General Equivalence Mappings map I34.8 to ICD-9-CM 424.0.