This guide covers telehealth law across licensure, clinical practice, prescribing, payment, privacy, and business structure. Part One establishes the governing principle that practice occurs where the patient is located and traces its consequences. Part Two covers licensure, compacts, and the exceptions that make multistate practice workable. Part Three covers the clinical standard of care and documentation. Part Four covers prescribing, including the controlled substance framework and its temporary flexibilities. Part Five covers reimbursement under federal programs and commercial parity laws. Part Six covers privacy, platforms, and data. Part Seven covers entity structure, corporate practice restrictions, and fraud and abuse exposure. Part Eight covers program design, audits, and the recurring failure modes.