Central Occupational Health Center (COHC) DOT DMV CDL Medical Examination. Offer a 1 stop service covering medical exam and document filings to DMV. NRCME’s at COHC are leading providers within the DOT industry. We maintain comprehensive knowledge on DOT regulations to ensure drivers not only receive valid medical certificates but remain compliant to ever changing regulations. We guarantee you will benefit from our expertise, convenience, and commitment to safety.