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U.S. ICD-10-CM · FY 2027

I51 ICD-10-CM Code: Complications and ill-defined descriptions of heart disease

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Code definition

Official description

I51

Complications and ill-defined descriptions of heart disease

ICD-10-CM diagnosis code · United States clinical modification

Classification

Where I51 sits

  1. 1

    Chapter 9

    Diseases of the circulatory system (I00-I99)

  2. 2

    Section

    Other forms of heart disease (I30-I5A)

  3. 3

    Category I51

    Complications and ill-defined descriptions of heart disease

  4. 4

    Code I51

    Complications and ill-defined descriptions of heart disease

More specific choices

Codes under I51

I51 is a non-billable category. Choose the child code that best matches the documented diagnosis.

I51.0

Cardiac septal defect, acquired

I51.1

Rupture of chordae tendineae, not elsewhere classified

I51.2

Rupture of papillary muscle, not elsewhere classified

I51.3

Intracardiac thrombosis, not elsewhere classified

I51.4

Myocarditis, unspecified

I51.5

Myocardial degeneration

I51.7

Cardiomegaly

I51.8

Other ill-defined heart diseases

I51.9

Heart disease, unspecified

Documentation details

Notes for this code

Inclusion terms

No inclusion terms are listed for I51.

Code first

No “code first” instruction is listed for I51.

Use additional code

No “use additional code” instruction is listed for I51.

Excludes1

Conditions that should not be reported together with this code.

No Excludes1 note is listed for I51.

Excludes2

Conditions not included here that may be reported separately when present.

  • heart disease specified as rheumatic (I00-I09)

Transparency

Source and release

Data release

U.S. ICD-10-CM · FY 2027

Effective date

Oct 1, 2026

Publisher

Vero Scribe Inc.

This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.

Review the CDC/NCHS ICD-10-CM source

Code-specific guidance

Frequently asked questions

What does ICD-10-CM code I51 mean?

I51 is the FY 2027 U.S. ICD-10-CM code for “Complications and ill-defined descriptions of heart disease.”

Is I51 a billable or specific ICD-10-CM code?

No. I51 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.

Where is I51 located in ICD-10-CM?

I51 is listed in Chapter 9, Diseases of the circulatory system (I00-I99), within Other forms of heart disease (I30-I5A) (I30–I5A), under category I51, Complications and ill-defined descriptions of heart disease.

What coding notes are listed for I51?

No inclusion terms are listed for I51 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. Excludes2 notes: heart disease specified as rheumatic (I00-I09).

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