Medicare AdvantageAdministrativeHigh impact
[Ohio] Important Reminder: Coordination of Benefits
CareSource·OH·Provider Bulletin
Effective date
Nov 3, 2025
We identified it
May 9, 2026
Summary
CareSource Ohio is reminding providers that Coordination of Benefits (COB) documentation must be submitted with all claims to prevent denials and expedite processing. Providers are responsible for verifying other insurance coverage at the time of service using the Provider Portal, 270/271 transactions, or phone verification, and must include all COB information when submitting claims electronically or by mail.
Action Required
Immediately: (1) Billing team must implement mandatory COB verification workflow at point of service using CareSource Provider Portal, HIPAA 270/271 transactions, or Provider Services phone line before claim submission. (2) Update billing software and clearinghouse settings to require COB information entry at line level for CMS-1500 claims and claim level for UB-04 claims, including other carrier paid amounts and all adjustment codes. (3) Train all front-desk and billing staff to verify insurance coverage for every patient and document third-party liability information in the patient record. (4) Establish process to submit Explanation of Benefits (EOB) documentation to COBOhio@CareSource.com, fax 937-396-3138, or mailing address when COB denials are received. (5) Configure billing system to flag claims missing COB documentation before submission. Failure to include COB information will result in claim denials and payment delays.