Geriatrics is definitely a rewarding field. My background was FM but I was trained as a fellow in an IM program and I enjoyed it very much because it gave me sort of a different perspective looking at patients and diseases. And my training was very rigorous and I actually worked like a FM intern.
In academia, you can spend 1 hour on each new patient and 30 min. on each f/u or 45 min each encouter if say a procedure (i.e pap, vaginal estrogen ring placement) is needed. You can still make a nice living with 6 figure salary plus university perks. It is not hard to find a geriatric academic position at this time because many FM programs/IM programs would like to use your expertise to teach med students or expose residents to geriatrics. In addition, you can assist in curriculum development as well.
Outside of academia, depending on where you want to practice, there are many subsidized geriatric clinics affiliated with a private hospital. Again, you can make your 6 figure salary and see on the avg 13-15 patients per day.
You can also do LTC 100%. If you're a medical director at a LTC facility, doing only administrative things w/o patient care, you can earn up to $30K/yr. This requires approx 1 day/week to sign papers. Non-geriatric attendings would ask you for advise on geriatric issues if needed. So a lot of geriatrics in an outpt clinic can do this on the side to make extra money. In addition, being a medical director plus being an attending at the facility, then you can make much much more money.
To make $150K, you need to take care of 13-15 subacute patients at one time and 100 NH patients. Medicare dictates that you see your subacute patients once per week and your long term care NH patients every 60 days. So it is not bad. You can also work out a deal with a PA or NP to help you so you can take care of even more patients.
Furthermore, if you go see your patients, in addition to your mandatory visits, for any acute reasons i.e. elevated BP, cough, SOB, constipation, fever, or whatever, you get to bill Medicare under Part A and treat it as a visit to the PCP.
I was told previously by my attendings that an addmission H/P/Orders to a subacute facility or transitional unit is paid more than an acute admission H/P/Orders in a hospital. I don't know why.
Having said all that, you would more likely have to be fellowship trained, board eligible, in order to do what I mentioned above.
Billing is also very important. In 60 min or even 30 min visits, you can easily bill a level 4 if you cover enough systems and document them. Also, when you document in the chart, don't write routine 3 mo. f/u or f/u for DM. You should always write f/u for DM mgt. This will get you more money...again..I don't know why but this is the way it's done during my training.