How can he get better if he can't find a psychiatrist?

My boyfriend has severe depression (and all of the signs and symptoms of severe depression) that he's been dealing with since he was 5.
He said that growing up he thought it was normal to feel that way so he never asked for help. He says it's now getting much worse and it's very visibly affecting him. He looked up psychiatrists in our area (Indianapolis) and he found one that he thought would be good, so we called and he just called back saying he doesn't accept insurance. We kept looking again and that seems to be a recurring thing with the psychiatrists we're calling.
Since I strongly believe he has low dopamine (I'm a 3rd year psychology student), I think he needs more than just having someone to talk to.
Any advice on what he should do?

I think finding someone professional to talk to would still be a good first step. Certified psychologists [and many counsellors] will be able to sign post him to a psychiatrist. And might be able to advise on getting through the insurance red tape. It also gives him support while he's going through that process.

He could also try contacting his healthcare provider directly. As they should be able to list psychs that they work with. Or community mental health centers locally may be able to offer lower cost services directly. [Which depending on his copay might still work out more manageable.]

He can go to his insurance company and ask for a list of psychiatrists that are in network. (He might even be able to find this online if he has an online account with his insurance company.) A professional will be able to tell if he needs therapy, medication, a combination, etc. and get him those things. Some insurance companies in the US even have psychiatric nurses who will call to check in on a their clients every week or so to see if they need a treatment change or doctor change.

Also, I know it's tempting to diagnose when you have a psych background, but be careful - I, personally, want my friends and family to be just that: friends and family.

I hope he is able to find something that works for him. Best of luck.