UCR (Usual, Customary, and Reasonable) September 22, 2020 03:12 Updated The amount paid for a medical service in a geographic area based on what providers in the area usually charge for the same or similar medical service. The UCR amount sometimes is used to determine the allowed amount. Related articles What should I do if I experience a change in income or another change in circumstance during the year? Second Lowest Cost Silver Plan (SLCSP) Can't find your answer? Find local assistance or contact us.