The Medicare Provider Utilization and Payment Data: Physician and Other Supplier Public Use File (POSPUF) and Medicare Physician and Other Supplier National Provider Identifier (POS NPI) Aggregate Report are publicly available files from the Center for Medicare and Medicaid Services that include payments to providers who care for fee-for-service Medicare recipients. The aim of this study was to analyze variability in gynecologic oncologists' Medicare reimbursements, with attention to differences in provider gender and time in practice.The 2015 POSPUF and POS NPI were analyzed with respect to gynecologic oncologists. We searched external publicly available data sources to confirm subspecialty and to determine each provider's number of years in practice. Evaluation and management (E&M) and procedure/surgery codes were analyzed; drug delivery codes were excluded due to variability in billing by facility/hospital.The POS NPI file included 733 gynecologic oncologist providers receiving $55,626,739 in total payments. Female providers comprised 39% of gynecologic oncologists and received 31% of reimbursements (30% of E&M reimbursements and 24% of surgical reimbursements). During the first ten years in practice, female providers comprised 58% of providers and accounted for 52% of reimbursed services, compared to 38% of providers/26% of reimbursed services (11-20 years), and 18% of providers/19% of reimbursed services (>20 years).Male gynecologic oncologists perform more Medicare services than their female counterparts. There is a comparable number of services performed between genders among both the most senior and the most junior providers, with a gender gap in services and reimbursements among mid-career providers.