ICD-9-CM Diagnosis Code 991.9
Diagnosis Code: 991.9 (Raw: 9919)
Description: Unspecified effect of reduced temperature
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 991.9 is designated for Unspecified effect of reduced temperature. While superseded by ICD-10 for current healthcare encounters, it remains a recognized reference code for CMS Section 111 reporting, legacy claims adjudication, and historical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.