Reminder to Include ICD-9-CM Diagnosis Codes On Claims

All Medicare claims must be billed to Part B carriers with a valid diagnosis code with the exception of Ambulance suppliers. Carriers will return as unprocessable, claims that do not contain a valid diagnosis code in item 21 of the CMS -1500 claim form or equivalent electronic field (HI segment – Loop 2300). Enter up to 4 codes in priority order (primary, secondary condition).