I51.9 – Heart disease, unspecified
ICD-10-CM 2027 diagnosis code · Other forms of heart disease
ICD-10-CM code
I51.9
- Code
I51.9(claims format:I519)- Description
- Heart disease, unspecified
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 9. Diseases of the circulatory system (I00-I99)
- Block
- I30-I5A Other forms of heart disease
- Parent codes
- I51
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
I51 – Complications and ill-defined descriptions of heart disease
Index terms for I51.9
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in I51
- I51.0 – Cardiac septal defect, acquiredBillable
- I51.1 – Rupture of chordae tendineae, not elsewhere classifiedBillable
- I51.2 – Rupture of papillary muscle, not elsewhere classifiedBillable
- I51.3 – Intracardiac thrombosis, not elsewhere classifiedBillable
- I51.4 – Myocarditis, unspecifiedBillable
- I51.5 – Myocardial degenerationBillable
- I51.7 – CardiomegalyBillable
- I51.8 – Other ill-defined heart diseasesHeader
Frequently asked questions
What is ICD-10 code I51.9?
I51.9 is the ICD-10-CM code for heart disease, unspecified, in the block I30-I5A (Other forms of heart disease).
Is I51.9 a billable code?
Yes. I51.9 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does I51.9 belong to?
It belongs to category I51 – Complications and ill-defined descriptions of heart disease.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.