MedicaidBilling CodesHigh impact
24-1213 Bill Correct Primary Diagnosis on Facility Claims to Avoid Payment Delays
Health Net·CA·Reimbursement
Effective date
Feb 4, 2025
We identified it
Jun 20, 2026
Summary
Effective February 4, 2025, HealthNet California will implement new claim edits that will automatically deny facility claims with inappropriate primary diagnosis codes, including manifestation, sequela, or circumstance codes that don't describe current illness/injury. Providers must use correct ICD-10-CM primary diagnosis codes following CMS guidelines to avoid claim denials and resubmission requirements.
Action Required
Before February 4, 2025: Billing team must review and update all facility claim coding processes to ensure primary diagnosis codes comply with ICD-10-CM guidelines. Train coding staff to avoid using manifestation codes, sequela codes (seventh character 'S'), and circumstance codes as primary diagnoses. Update coding software validation rules to flag inappropriate primary diagnosis codes. Review ICD-10-CM Official Guidelines and CMS coding requirements. Claims with incorrect primary diagnosis codes will be automatically denied requiring corrected claim resubmission.