ICD-9-CM Diagnosis Code 556.5
Diagnosis Code: 556.5 (Raw: 5565)
Description: Left-sided ulcerative (chronic) colitis
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 556.5 is designated for Left-sided ulcerative (chronic) colitis. While superseded by ICD-10 for current healthcare encounters, it remains a recognized reference code for CMS Section 111 reporting, legacy claims adjudication, and historical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.