Third Party Liability Federal regulations require Medicaid to be the "payer of last resort". This means that all third party insurance carriers, inculding Medicare and private health insurance carriers, must be billed before Medicaid processes the claim. Additionally, Providers must report any payments from third parties on claims filed for Medicaid payment. Third Party Insurance Codes Carrier Codes Coverage Codes Third Party Liability Information Card Electronic Secondary Billing for Medicare and Senior Replacement Plans Please view billing instructions if using the Provider Electronic Solutions Software. The appropriate Carrier Codes can be found in the table below. Electronic Secondary Billing for Medicare and Senior Replacement Plans To facilitate electronic billing and proper reimbursement for Medicare and Commercial Medicare Plans (Advantage/Replacement Plans) such as United Senior Care, Blue-Chip Medicare HMO, WellCare Advantage Plan the following fields are required: Loop 2320 Other Subscriber Information SBR09 - Must contain MA or MB as appropriate for the claim filing indictor Loop 2320 Claim Level Adjustments CAS segment - Must contain Deductible PR 1 or Coinsurance of PR 2 Loop 2320 Coordination of Benefits (COB) Payer Paid Amount – Must contain the Amount Paid (other insurance paid amount) Loop 2330B Other Payer Name (Carrier Code) Segment NM109 Other Payer Primary Identifier – Must contain the appropriate carrier code, see below for a list: MDA/MDB – Medicare 22A – Aetna Medicare Advantage Plan 06A – United Senior Care 24A – Connecticare Medicare Advantage Plan 08A – Healthfirst Medicare Advantage Plan 26A – Humana Medicare Advantage Plan 09A – HMO Blue of Massachusetts Advantage Plan 26B – Humana Medicare Advantage Dental Plan 12A – Blue Chip Medicare HMO 89A – Tufts Health Plan (PPO) Medicare Advantage Plan 18A – Wellcare Medicare Advantage Plan C01 – CarePlus Advantage Plan 19A – MMM Healthcare of Puerto Rico Advantage Plan C02 – Commonwealth Care Alliance, Inc. Medicare Advantage Plan