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ICD-10-CM 2027 diagnosis code

I42.8Other cardiomyopathies

Not billable — use a more specific code

I42.8 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 FY2027 (effective October 1, 2026). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About I42.8

I42.8 is the ICD-10-CM diagnosis code for other cardiomyopathies. It belongs to category I42 (cardiomyopathy), 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 I42, choose I42.8 (Other cardiomyopathies) only when documentation doesn't support a more specific option: dilated cardiomyopathy (I42.0), obstructive hypertrophic cardiomyopathy (I42.1), other hypertrophic cardiomyopathy (I42.2), Endomyocardial (eosinophilic) disease (I42.3), endocardial fibroelastosis (I42.4), other restrictive cardiomyopathy (I42.5), alcoholic cardiomyopathy (I42.6), due to drug and external agent (I42.7) and 1 more.

To report this condition, pick the subcode that matches the documentation: I42.81 (cardiomyopathy) and I42.89 (not elsewhere classified).

Code first: pre-existing cardiomyopathy complicating pregnancy and puerperium (O99.4).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2027 (expanded into subcodes).

Before ICD-10, this condition was coded in ICD-9-CM as 425.2 (Obscure cardiomyopathy of Africa) and 425.4 (other primary cardiomyopathies).

Specific codes under I42.8

Notes that apply from higher levels

Instructions written at a parent level also apply to I42.8.

› From I42 Cardiomyopathy
Includes
  • myocardiopathy
Excludes2
  • ischemic cardiomyopathy (I25.5)
  • peripartum cardiomyopathy (O90.3)
  • ventricular hypertrophy (I51.7)
Code first
  • pre-existing cardiomyopathy complicating pregnancy and puerperium (O99.4)

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

ICD-9-CM equivalent

Converter →
  • 425.2Obscure cardiomyopathy of Africaapproximate
  • 425.4Other primary cardiomyopathiesapproximate

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)
  • FY2027 (effective 10/1/2026): Expanded — no longer billable

Common questions about I42.8

Is I42.8 billable?

No. I42.8 is a header code. Report one of its more specific subcodes instead.

What is the ICD-9 code for I42.8?

The CMS General Equivalence Mappings map I42.8 to ICD-9-CM 425.2 and 425.4.

Did I42.8 change for 2027?

Yes. For FY2027 (effective October 1, 2026) it was expanded into more specific subcodes, so it is no longer billable.