ICD-9-CM Diagnosis Code 538
Diagnosis Code: 538 (Raw: 538)
Description: Gastrointestinal mucositis (ulcerative)
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 538 is designated for Gastrointestinal mucositis (ulcerative). While superseded by ICD-10 for current healthcare encounters, it remains a recognized reference code for CMS Section 111 reporting, legacy claims adjudication, and historical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.