The CG-719K medical certificate and disqualifiers

The medical certificate is the step people worry about the most and understand the least. The fear is usually that a diagnosis will end the whole thing. In practice, an outright bar is rare. What is common is a detailed review: a condition that is not disqualifying on its own, but that the National Maritime Center (NMC) wants to see documented before it signs off. Knowing which conditions those are lets you gather the paperwork before you submit, instead of after your package is returned.

The certificate is completed on Form CG-719K, the Merchant Mariner Medical Certificate. This site is independent and is not the Coast Guard, the NMC, or a course provider, and nothing here is medical or legal advice.

What does the CG-719K check?

A licensed medical practitioner examines you and records the results on the CG-719K. The exam covers the fitness a mariner needs to stand a watch and respond in an emergency:

• Vision: distant visual acuity, color vision (important for reading navigation lights and buoys), and field of vision.
• Hearing: enough to hear signals and communications.
• General physical and mental fitness: cardiovascular, neurological, metabolic, psychiatric, and musculoskeletal status, plus current medications.

Most healthy applicants clear it in a single visit. The certificate is the practitioner’s professional finding, and the NMC then reviews it as part of your package.

What conditions trigger a detailed review?

The Coast Guard publishes medical guidance (in its Navigation and Vessel Inspection Circular, or NVIC, on medical evaluation) that flags conditions warranting closer scrutiny. These are generally not automatic disqualifiers, but they move your file from a routine sign-off into a detailed review, which takes longer and often asks for a treating physician’s letter. The commonly flagged categories include:

• Insulin-treated diabetes, because of hypoglycemia risk on watch.
• Cardiac disease: significant coronary artery disease, certain arrhythmias, implanted devices, or a recent cardiac event.
• Seizure disorders and epilepsy, where the concern is a sudden loss of function.
• Sleep apnea, especially untreated, because of daytime alertness.
• Serious psychiatric conditions and certain psychoactive medications.
• Substance-use history and medications that impair alertness.
• Vision or hearing below the standard, which may still be workable with a waiver.

If none of these apply to you, the CG-719K is usually a formality. If one does, it is manageable, but it is worth preparing for.

Can a medical condition disqualify you outright?

Rarely, and even then there is often a path. The Coast Guard uses a waiver process: when a condition falls outside the routine standard, you can request a waiver by documenting that the condition is controlled and does not create a safety risk. A well-supported waiver, with a treating physician’s letter, current test results, and evidence of stable management, turns many “flagged” conditions into an approval. The point of the detailed review is to decide whether you can safely stand a watch, not to punish a diagnosis.

How do you prepare for a flagged condition?

If you know you have one of the review-triggering conditions, do the work up front:

• Bring current records to the exam: recent test results, a medication list, and a treating physician’s summary.
• Ask your treating physician for a letter stating the condition is stable and controlled and does not impair your ability to perform mariner duties.
• Do not omit it. Like the conviction disclosure, a medical issue the NMC discovers you left off is a far bigger problem than one you documented.
• Submit the supporting package with the CG-719K, so the reviewer has everything in one pass instead of writing back for it.

How the medical fits the overall timeline

The CG-719K is one of several pieces in the application package, and a clean certificate keeps your file moving. A flagged condition that needs a waiver can add weeks, especially on top of the NMC’s current backlog (see the dated processing tracker), so if you suspect a review, start gathering documentation at the same time you start logging sea time. Use the current edition of the form from the NMC forms page; older editions get returned.

Sources: the public U.S. Coast Guard medical NVIC and CG-719K Merchant Mariner Medical Certificate guidance (dco.uscg.mil/nmc), and 46 CFR Part 10 medical standards via ecfr.gov, verified 2026-07-22. The current CG-719K is edition 12/25 (10 pages); editions change, so use the version on the NMC forms page. Medical determinations are made by the examining practitioner and the National Maritime Center; this guide is not medical or legal advice.