1. Medicare Part B spending on lab tests increased in 2021, driven by higher volume of COVID-19 tests, genetic tests, and chemistry tests Publication: Washington, D.C. : U.S. Department of Health and Human Services, Office of Inspector General, December 2022 Subject(s): Clinical Chemistry TestsCOVID-19 TestingGenetic TestingGovernment RegulationMedicare Part B -- economicsUnited States