39
APRIL 2026
homepage under the Credential Veri-
fication tab where a mariner’s creden-
tials, including medical certificates can 
be verified. An employer or prospec-
tive employer only needs the mariner’s 
name, MMC reference number, and 
a valid email address where results 
should be sent to complete the inquiry.
Any discrepancies detected during the 
online verification process or other 
concerns regarding Coast Guard-issued 
mariner credentials and medical certifi-
cates should first be addressed through 
the National Maritime Center via Live 
Chat, email, or by calling 1-888-IASK-
NMC. If the MMC is found to be 
expired* or otherwise not valid, follow 
up with your local Coast Guard Inves-
tigations Division is required.
*Note: Due to recent funding issues 
with the Department of Homeland 
Security (DHS), the Coast Guard 
has used their authority to extend the 
validity of MMCs expiring between 
Jan. 1 and May 31, 2026, until Aug. 31, 
2026. Mariners who are actively work-
ing on expired credentials that meet 
the previously mentioned expiration 
criteria, must carry the expired creden-
tial and a copy of the letter attached to 
Update #3 — Lapse in Appropriations 
and Government Shutdown while sail-
ing under the authority of their MMC. 
The NMC portal for submitting appli-
cations for MMCs and medical certifi-
cates remains operational; applications 
will be processed in the order received.
DRUG AND ALCOHOL BACK-
GROUND CHECKS
Beyond mariner citizenship, compe-
tency, and medical fitness for duty, 
adherence to federal drug testing 
requirements is something the pro-
spective employer must verify. In ad-
dition to conducting pre-employment 
testing, marine employers are required 
to obtain drug and alcohol testing in-
formation on new crewmembers, cre-
dentialed or not, that will be working 
in a safety sensitive position. 
After obtaining an individual’s writ-
ten consent, the marine employer 
must request specific drug and alco-
hol information from all the individ-
ual’s previous DOT employers in the 
last two years. Each request should 
have the employee’s original signature. 
Ideally the requested information is 
received by the potential employer be-
fore the individual starts performing 
safety sensitive duties; however, a ma-
rine employer can employ the individ-
ual for up to 30 days while the request 
is pending at previous employers. 
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