MedicaidBilling CodesHigh impact
Maryland Medical Assistance Program ICD-10 Implementation Policy
Maryland Medicaid·MD·Provider Transmittal
We identified it
Jun 20, 2026
Summary
Maryland's Medicaid program is transitioning from ICD-9 to ICD-10 diagnosis coding system. All healthcare providers billing Maryland Medicaid must use ICD-10 codes instead of ICD-9 codes for diagnosis reporting on claims and prior authorization requests.
Action Required
Immediately: Update billing software and systems to use ICD-10 diagnosis codes for all Maryland Medicaid claims and prior authorization requests. Stop using ICD-9 codes entirely. Train billing staff on ICD-10 code structure and mapping. Update encounter forms and EMR templates to ensure ICD-10 codes are captured. Claims submitted with ICD-9 codes will be rejected.