Hidden costs can be in a variety categories. Prior doc/owner at my practice was spending $3k/month on "IT support" that basically wasn't doing anything, I cut that immediately (this company threatened to sue me when I cut them, probably because their free money was going to be gone). He was spending $2k/month on marketing, she wasn't doing anything and just came in once or twice a month to chat with the office ladies. Cut that immediately. He was spending about $1k/month on phone/internet, we are down to about $300/month for both now. He was letting prior office manager order supplies, spending 8-10k/month, we have it down to about 5k/month now (just took a minimal amount of effort shopping around for better prices). He was wildly over-paying our physician assistants - they are now gone and replaced with one far more reasonably-paid one.
All together, we cut costs by like 20k a month or more probably - and we are far more efficient and busier than before.
You really need to have access to the expense list - I guarantee most places are not paying attention to areas of cost cutting that can be implemented without reducing quality. Everyone needs to DOGE their practices.