ICD-9-CM Diagnosis Code 339.42
Diagnosis Code: 339.42 (Raw: 33942)
Description: New daily persistent headache
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 339.42 is designated for New daily persistent headache. While superseded by ICD-10 for current healthcare encounters, it remains a recognized reference code for CMS Section 111 reporting, legacy claims adjudication, and historical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.