Can a non-physician own a med spa in Delaware?

Short answer
Only outside a professional corporation — a Delaware PC may have as shareholders only those licensed to render the same service (medicine, or medicine plus podiatry), so a non-physician can't hold shares in a medical PC; other entity forms aren't addressed.

Delaware’s cited restriction runs through the Professional Corporation form. A corporation organized under Chapter 6 of Title 8 exists for the sole and specific purpose of rendering a single professional service, and its shareholders may be only individuals who are themselves licensed or otherwise legally authorized to render that same service. The chapter permits exactly one combination — medicine and podiatry — and expressly leaves untouched the professional relationship, the contract and tort liabilities, and the standards for professional conduct of the person rendering the service. These claims survey Chapter 6 alone and do not report on requirements elsewhere in Delaware law. The Board of Medical Licensure and Discipline’s regulation then names the arrangement among its enumerated unprofessional conduct: Payment of a fee by a physician to another physician who referred the patient, unless the fee is in proportion to work actually performed by the referring physician, and willful failure to disclose to a patient that a referring physician holds a financial interest in an outside ancillary testing or treatment facility.