Outpatient surgery : medical necessity and quality of care / Department of Health and Human Services, Office of Inspector General. - 1 online resource ([36] pages) : illustrations, map "OEI-09-88-01000." "February 1991." CRDP Project record. Includes bibliographical references (pages C-1-C-8). Subjects--Topical Terms: Medicare--Claims administration.Ambulatory medical care--Evaluation.--United States GPO Item No.: 0445-B-07 (online) Gov. Doc. Class. No.: HE 1.75:OEI-09-88-01000 Report. No.: OEI-09-88-01000