Do they pay you a fixed rate for each CPT code regardless of insurance, or does it depend on the insurance? As there are often very different rates between insurance companies, there is no way every insurance they contract with is paying exactly or even approximately the same. The other thing to bear in mind is your compensation will be lower to start with as you'll have predominantly new patients but will get to that over time.
I'll give you an example. One of the groups near me was getting reimbursed about $335 for the 99214+90833 combo by one insurance. It's probably more now - this was 3 years ago. They take lots of insurances including medicare and this is one of the less common insurances. So if you were estimating your compensation based on this reimbursement it would be quite a bit lower. They also had issues w/ being on prepayment review with another insurance so a lot of people didn't get paid for a lot of claims for like a year which is untenable for a lot of people.
In addition to asking % claims collected it is also help to know average time to collection, the longest time to collection, and whether they have been any audits, prepayment reviews, or clawbacks.
In my consulting work I've found out that the different BCBS subsidiaries under elevance health are being more aggressive and this has been stressful and ruinous even for some group practices. Aetna has also been upping its game with denials, requests for records etc. UHC/optum is no worse than before and interestingly might have even softened down from excrutiating to just plain awful.