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

ICD-10-CM Diagnosis Code (2025)

Official Description for I51

Complications and ill-defined descriptions of heart disease

Coding Notes & Guidelines for I51

Excludes1: Not Coded Here
  • any condition in I51.4-I51.9 due to hypertension (I11.-)
  • any condition in I51.4-I51.9 due to hypertension and chronic kidney disease (I13.-)
  • heart disease specified as rheumatic (I00-I09)
Excludes1: Not Coded Here

cardiac septal defect as current complication following acute myocardial infarction (I23.1, I23.2)

Excludes1: Not Coded Here

rupture of chordae tendineae as current complication following acute myocardial infarction (I23.4)

Excludes1: Not Coded Here

rupture of papillary muscle as current complication following acute myocardial infarction (I23.5)

Excludes1: Not Coded Here

intracardiac thrombosis as current complication following acute myocardial infarction (I23.6)

Excludes1: Not Coded Here

acute or subacute myocarditis (I40.-)

Inclusion Terms
  • Acquired septal atrial defect (old)
  • Acquired septal auricular defect (old)
  • Acquired septal ventricular defect (old)
Inclusion Terms
  • Apical thrombosis (old)
  • Atrial thrombosis (old)
  • Auricular thrombosis (old)
  • Mural thrombosis (old)
  • Ventricular thrombosis (old)
Inclusion Terms
  • Chronic (interstitial) myocarditis
  • Myocardial fibrosis
  • Myocarditis NOS
Inclusion Terms
  • Fatty degeneration of heart or myocardium
  • Myocardial disease
  • Senile degeneration of heart or myocardium
Inclusion Terms
  • Cardiac dilatation
  • Cardiac hypertrophy
  • Ventricular dilatation
Inclusion Terms
  • Reversible left ventricular dysfunction following sudden emotional stress
  • Stress induced cardiomyopathy
  • Takotsubo cardiomyopathy
  • Transient left ventricular apical ballooning syndrome
Inclusion Terms
  • Carditis (acute)(chronic)
  • Pancarditis (acute)(chronic)

Child Codes (More Specific Codes for I51):

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 I51.81 - Takotsubo syndrome I51.89 - Other ill-defined heart diseases I51.9 - Heart disease, unspecified

About ICD-10-CM Code I51 (Complications and ill-defined descriptions of heart disease)

ICD-10-CM code I51 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM I51 became effective on October 1, 2024.

This page provides detailed information about I51 - Complications and ill-defined descriptions of heart disease. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Complications and ill-defined descriptions of heart disease.