I agree generally. If the fees you've set for a given surgery in your practice include the postoperative care, then those fees will include post-operative care for all patients, including self-pay patients. Think of it this way, if you were a bicycle shop and when the parents paid for a bike for their child you charged one price for the whole bike, but then if an adult came in to buy a bike for themselves, you told them that the price you had on the bike didn't include the wheels, just the frame, and that wheels are an extra cost - that wouldn't be a very good type of business practice.
All that said, if a patient has no insurance, your provider can negotiate a rate as a private contract with that patient, and that can be whatever the provider and patient agree on. As a matter of good business ethics and practice, you should be transparent with the patient as to what is or is not included in the package that the provider and patient decide upon.