HCPCS Level II code G9880 documents that a Medicare Diabetes Prevention Program (MDPP) beneficiary achieved at least 5% weight loss from baseline during months 1–12 of the MDPP expanded model; it is a one-time payment triggered when an in-person weight measurement at a core or core maintenance session confirms the first attainment of at least 5% weight loss. The service type is a targeted MDPP outcome measurement and the typical site of service is an in-person MDPP core or core maintenance session held in a clinical or community program setting.