Resident Physician Shortage Reduction Act of 2023 This bill increases the number of residency positions eligible for graduate medical education payments under Medicare for qualifying hospitals, including hospitals in rural areas and health professional shortage areas. Current law provides for an increase of up to 200 positions per fiscal year beginning in FY2023, with a total increase of 1,000 positions; each hospital may receive up to 25 additional positions. Current law also provides for an additional increase of up to 200 positions for FY2026, with at least 100 of these positions for psychiatry or related specialties; each hospital may receive up to 10 additional positions. The bill provides for an additional increase of 2,000 positions per fiscal year from FY2025-FY2031; during this period, each hospital may receive up to 75 additional positions in total under the bill and current law. The bill also requires the Government Accountability Office to report on strategies to increase the diversity of the health professional workforce, including with respect to representation from rural, low-income, and minority communities.