MassHealth (Medicaid)

Other Carrier Codes

When sending secondary claims to MassHealth (Massachusetts Medicaid), or when passing an other payer ID, this payer requires their proprietary payer ID's (Carrier Code). Reference the MassHealth Appendix C: Third-Party Liability Codes page for a list of allowed codes. 

Secondary / Other payer ID's can be sent in block 9d for Professional Claims and block 51b for Institutional Claims.

Facility Claim

Institutional Claim

Medicaid Provider ID and NPI Crosswalk

Per HIPAA 5010 X12 standards, Medicaid is not allowed to receive a Medicaid provider ID on electronic claims, if the provider has an NPI.

Medicaid may tell you the wrong provider ID was sent on a claim, but this means their crosswalk did not match the correct provider ID.

The payer is using a table of information that tells them which provider ID to assign to the claim after it has been received.

This table or "crosswalk" of information normally includes:

- Provider NPI

- Provider Address

- Provider taxonomy code