ICD-9-CM Diagnosis Code 398.91
Diagnosis Code: 398.91 (Raw: 39891)
Description: Rheumatic heart failure (congestive)
Classification: International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM)
Fiscal Year: 2026 Reference
CMS Section 111 Status: Valid for reporting.
Overview & Historical Usage
ICD-9-CM code 398.91 is designated for Rheumatic heart failure (congestive). While superseded by ICD-10 for current healthcare encounters, it remains a recognized reference code for CMS Section 111 reporting, legacy claims adjudication, and historical clinical data analysis.