Under which regulations is medically necessity defined?

The definition of medical necessity is primarily found within Title XVIII of the Social Security Act, which governs the Medicare program. This title outlines the parameters for payment under Medicare, including the necessity requirement for services to be covered. Medical necessity refers to healthcare services that are necessary for the diagnosis or treatment of a medical condition, align with accepted standards of medicine, and are deemed appropriate and not excessive.

While Title XIX of the Social Security Act pertains to Medicaid and includes elements of healthcare services, and although other sources such as Medicare Regulations and acts like the Healthcare Surrogate Act provide guidelines or regulations for specific areas, they do not offer the foundational definition of medical necessity itself as detailed in Title XVIII.

Understanding this context is crucial for professionals working in coding, billing, and compliance within the healthcare system, as it directly impacts reimbursement decisions and service provision standards.