DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

I42 Cardiomyopathy

  • Header · not billable

I42 is not billable. The category heads 13 billable codes in FY2027, grouped under 10 subdivisions.

FY2027 changes under I42: 5 billable codes added; I42.0, I42.8 no longer billable (now headers). All FY2027 changes.

Index → code

  • Endomyofibrosis → I42.3
  • Elastomyofibrosis → I42.4
  • Beer drinker's heart (disease) → I42.6

Where it sits

  1. Chapter 9 Diseases of the circulatory system (I00-I99)
  2. I30-I5A Other forms of heart disease (I30-I5A)
  3. I42 Cardiomyopathy
Billable codes
13
Subdivisions
10
CC / MCC codes
13 / 0
HCC V28 codes
7
New FY2027
5
Index entries
64

Codes in I42

  1. I42.0
    Dilated cardiomyopathy Not billable since FY2027
    Header
  2. I42.00
    Dilated cardiomyopathy, unspecified New FY2027
    BillableCC
    Inclusion terms 1

    Inclusion terms

    • Congestive cardiomyopathy, NOS
  3. I42.01
    Familial-genetic dilated cardiomyopathy New FY2027
    BillableCC
  4. I42.09
    Other dilated cardiomyopathy New FY2027
    BillableCC
    Inclusion terms 1

    Inclusion terms

    • Other nonfamilial dilated cardiomyopathy
  5. I42.1
    Obstructive hypertrophic cardiomyopathy
    BillableCC227
    Inclusion terms 1

    Inclusion terms

    • Hypertrophic subaortic stenosis (idiopathic)
  6. I42.2
    Other hypertrophic cardiomyopathy
    BillableCC227
    Inclusion terms 1

    Inclusion terms

    • Nonobstructive hypertrophic cardiomyopathy
  7. I42.3
    Endomyocardial (eosinophilic) disease
    BillableCC227
    Inclusion terms 2

    Inclusion terms

    • Endomyocardial (tropical) fibrosis
    • Löffler's endocarditis
  8. I42.4
    Endocardial fibroelastosis
    BillableCC227
    Inclusion terms 2

    Inclusion terms

    • Congenital cardiomyopathy
    • Elastomyofibrosis
  9. I42.5
    Other restrictive cardiomyopathy
    BillableCC227
    Inclusion terms 1

    Inclusion terms

    • Constrictive cardiomyopathy NOS
  10. I42.6
    Alcoholic cardiomyopathy
    BillableCC227
    Code also 1

    Code also

    • presence of alcoholism (F10.-) F10
  11. I42.7
    Cardiomyopathy due to drug and external agent
    BillableCC
    Code first 1, Use additional code 1

    Code first

    • poisoning due to drug or toxin, if applicable (T36-T65 with fifth or sixth character 1-4) T36 T65

    Use additional code

    • code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5) T36 T50
  12. I42.8
    Other cardiomyopathies Not billable since FY2027
    Header
  13. I42.81
    Arrhythmogenic cardiomyopathy New FY2027
    BillableCC
  14. I42.89
    Other cardiomyopathies not elsewhere classified New FY2027
    BillableCC
  15. I42.9
    Cardiomyopathy, unspecified
    BillableCC227
    Inclusion terms 1

    Inclusion terms

    • Cardiomyopathy (primary) (secondary) NOS

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).

Sources of each column.

Instructions

At I42

Includes

  • myocardiopathy

Excludes2

  • ischemic cardiomyopathy (I25.5) I25.5
  • peripartum cardiomyopathy (O90.3) O90.3
  • ventricular hypertrophy (I51.7) I51.7

Code first

  • pre-existing cardiomyopathy complicating pregnancy and puerperium (O99.4) O99.4

Notes that also apply

Chapter 9 instructions (Excludes2 10): printed on the chapter 9 page.

Index entries

  • Endomyocardiopathy, South African → I42.3
  • Endomyofibrosis → I42.3
  • Elastomyofibrosis → I42.4
  • Fibroelastosis (cordis) (endocardial) (endomyocardial) → I42.4
  • Beer drinker's heart (disease) → I42.6
  • South African cardiomyopathy syndrome → I42.89
  • Cardiomyopathy (familial) (idiopathic) → I42.9
  • Myocardiopathy (congestive) (constrictive) (familial) (hypertrophic nonobstructive) (idiopathic) (infiltrative) (obstructive) (primary) (restrictive) (sporadic) → I42.9
  • Cardiomyopathy (familial) (idiopathic)congestive → I42.00
  • Cardiomyopathy (familial) (idiopathic)dilated → I42.00
  • Myocardiopathy (congestive) (constrictive) (familial) (hypertrophic nonobstructive) (idiopathic) (infiltrative) (obstructive) (primary) (restrictive) (sporadic)hypertrophic obstructive → I42.1
  • Stenosis, stenotic (cicatricial)hypertrophic subaortic (idiopathic) → I42.1
  • Cardiomyopathy (familial) (idiopathic)hypertrophic (nonobstructive) → I42.2
  • Disease, diseasedendomyocardial (eosinophilic) → I42.3
  • Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular)Löffler's → I42.3
  • Fibrosis, fibroticendomyocardial (tropical) → I42.3
  • Löffler'sendocarditis → I42.3
  • Cardiomyopathy (familial) (idiopathic)congenital → I42.4
  • Sclerosis, scleroticsubendocardial, congenital → I42.4
  • Cardiomyopathy (familial) (idiopathic)constrictive NOS → I42.5
  • Cardiomyopathy (familial) (idiopathic)restrictive NEC → I42.5
  • Alcohol, alcoholic, alcohol-inducedcardiopathy → I42.6
  • Cardiomyopathy (familial) (idiopathic)alcoholic → I42.6
  • Cardiomyopathy (familial) (idiopathic)cobalt-beer → I42.6
  • Myocardiopathy (congestive) (constrictive) (familial) (hypertrophic nonobstructive) (idiopathic) (infiltrative) (obstructive) (primary) (restrictive) (sporadic)alcoholic → I42.6
  • Myocardiopathy (congestive) (constrictive) (familial) (hypertrophic nonobstructive) (idiopathic) (infiltrative) (obstructive) (primary) (restrictive) (sporadic)cobalt-beer → I42.6
  • Cardiomyopathy (familial) (idiopathic)toxic NEC → I42.7
  • Myocardiopathy (congestive) (constrictive) (familial) (hypertrophic nonobstructive) (idiopathic) (infiltrative) (obstructive) (primary) (restrictive) (sporadic)toxic NEC → I42.7
  • Cardiomyopathy (familial) (idiopathic)arrhythmogenic → I42.81
  • Dysplasiaarrhythmogenic right ventricular → I42.81
  • Dysplasiaright ventricular, arrhythmogenic → I42.81
  • Dysplasiaventricular (biventricular) (left) (right), arrhythmogenic → I42.81
  • Becker'scardiomyopathy → I42.89
  • Cardiomyopathy (familial) (idiopathic)newborn → I42.89
  • Cardiomyopathy (familial) (idiopathic)non-ischemic → I42.89
  • Cardiomyopathy (familial) (idiopathic)obscure of Africa → I42.89
  • Cardiomyopathy (familial) (idiopathic)specified NEC → I42.89
  • Collagenosis, collagen disease (nonvascular) (vascular)cardiovascular → I42.89
  • Myocardiopathy (congestive) (constrictive) (familial) (hypertrophic nonobstructive) (idiopathic) (infiltrative) (obstructive) (primary) (restrictive) (sporadic)obscure (African) → I42.89
  • SyndromeSouth African cardiomyopathy → I42.89

24 more, longer entries are not listed; the search box finds them by word.

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy