I51
⚠ Non-billable
Complications and ill-defined descriptions of heart disease
ICD-10-CM · FY2026 · Diseases of the Circulatory System
Code
I51
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Diseases of the Circulatory System
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code I51?
ICD-10-CM code I51 represents Complications and ill-defined descriptions of heart disease. It is a non-billable header code requiring a more specific subcategory in the Diseases of the Circulatory System chapter, effective October 1, 2025 – September 30, 2026.
Is I51 billable?
No. I51 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is I51 in?
I51 belongs to the Diseases of the Circulatory System chapter (I00–I99) of ICD-10-CM.
Related codes in the I51 category
I51.0
Cardiac septal defect, acquired
Billable
I51.1
Rupture of chordae tendineae, not elsewhere classified
Billable
I51.2
Rupture of papillary muscle, not elsewhere classified
Billable
I51.3
Intracardiac thrombosis, not elsewhere classified
Billable
I51.4
Myocarditis, unspecified
Billable
I51.5
Myocardial degeneration
Billable
I51.7
Cardiomegaly
Billable
I51.8
Other ill-defined heart diseases
Non-billable
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