Privacy & Security. Model Notices of Privacy Practices. The Office of the National Coordinator for Health Information Technology (ONC) and the Office for Civil Rights (OCR) collaborated to develop model Notices of Privacy Practices for health care providers and health plans for use when communicating with their patients and plan members.
Q.O.D. = every other day. Q.A.D. = every alternate day. Technically speaking, I would be hard pressed to find a difference. Nevertheless, I have spent a lifetime writing q.o.d. on prescriptions so that pharmacists can transcribe the latin abbreviation back into plain English for the patient. What a useless step!
1 The o is a contraction or abbreviation of four of the clock.  2 O 'clock is an abbreviation of of the clock.  In times past clocks were relatively rare. Most people told time by some reference to the position of the sun or moon. The times provided by these two bodies do not always concur with those provided by a clock.