The medical practice entity, state by state.

In many states, yes, but as a professional LLC rather than an ordinary one. Some states do not permit medical practices to use the LLC form at all and require a professional corporation instead. It is a state-level answer with no national version, and it is the first thing your state page settles, because the documents and the ownership rules all follow from it.

In most states, licensed physicians and nobody else. The all-physician membership rule means outside investors, non-clinical partners and management companies cannot hold membership interests, however the practice is financed or administered day to day. It also means adding an owner later is a licensing question before it is a business one. The rule as your state applies it is on its page.

In most states the board's approval is part of the formation path rather than a follow-up to it. It can reach the entity's name, its ownership and the documents filed with the state, which is why the board's requirements are worth reading before anything is submitted rather than after a rejection. Where a state handles this differently, its page says so.

Both are professional entities restricted to licensed practitioners, and which one is open to physicians is decided by state law rather than by preference. The practical difference is the machinery: a corporation runs on bylaws, a board, resolutions and shares, while an LLC runs on an operating agreement and membership interests. The clinical obligations sitting on top are the same either way.

No. The entity limits business liability. It does not answer a claim about clinical care, and it does not shield a physician's own negligence, which is exactly what malpractice cover exists for. That is why insurance sits inside the formation steps on every state page rather than in a list of things to arrange once the practice is already seeing patients.

HIPAA for patient information, the federal rules on referrals and kickbacks, DEA registration where controlled substances are prescribed, and the ongoing reporting the state board requires. Renewals sit on top of all of it: physician licenses, the DEA registration, the malpractice policy and the entity's own state filings, each on its own cycle and none of them synchronized.