Yes, there are geriatric health managers, often called geriatric or senior case or care managers, and they certainly can help you assess your parents, even from a distance. Many are
social workers, psychologists, or nurses and work as consultants, charging per hour. Some work for agencies, hospitals, or senior nonprofit organizations. Geriatric managers usually operate as planners or organizers, identifying and coordinating all the care your parents might need, from housing to medical. It sounds like your parents might be able to afford hiring a manager, at least for a one-time consultation. It also sounds like this is a practical way for you to get information, and a good way for you to get peace of mind.
Hiring a geriatric care manager is like hiring anyone to do a personal service. You should interview a few people, and choose who you like best. To find candidates start by asking your parents' medical providers. You may also want to ask family friends in the community where your parents live; the local senior center or churches. Referrals are extremely helpful, but you can also do an internet search, or look in the old-fashioned phone book. Caring.com's eldercare directory is another excellent way to find local geriatric care managers. Most urban areas have many geriatric care managers; it's a growing field. It's certainly possible for you to hire someone from afar, by phone. But you might want to consider visiting your parents to make a final selection, as nothing can quite replace meeting in person.