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Merchant Mariner Credential and Medical Certificate Harmonization

In accordance with Section 304 of the 2015 Coast Guard Authorization Act, Public Law No. 114-120; mariners will be allowed to request harmonized expiration dates of their Merchant Mariner Credential (MMC) and Medical Certificate.

CG-MMC Policy Letter 01-18 provides detailed guidelines for those mariners who wish to harmonize the expiration dates of their original or renewed MMC and Medical Certificate.

For further information, contact the NMC call center via e-mail to, via online chat, or via phone at 1-888-IASKNMC (427-5662).


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