One of my friends worked for a medical insurer, they had excellent coverage and the employees benefitted from MDs who “insiders” knew would facilitate frauds.
She, and colleagues used to get aesthetic treatments and spa facials at a dermatology spa. The treatments got put thru with codes for acne, biopsy, other medical diagnosis. They would joke about their skin cancer treatment which was actually latest anti wrinkles, fillers & Botox.
The MD had a lucrative business doing the aesthetic & cosmetic business but patients making claims for medical treatments.
My ex-SIL used to get certain “off label” treatments one MD would put through for prescriptions and physio which was a personal trainer.
The kids wisdom teeth removals which claimed as medical “emergencies” but really are not. The deviated septum on insurance which is really cosmetic rhinoplasty.Etc
These are frauds and I’m sure it’s common.