SilverSneakers Program for Seniors with Osteoarthritis

Inclusion Criteria: * Aged 65 and older. * ICD-9 or ICD-10 code for hip, knee, or general osteoarthritis. * Positive response to a standardized question from the Medical Expenditure Panel Survey that asks if patient was diagnosed with osteoarthritis/arthritis and self-report confirmation of hip and/or knee pain due to their osteoarthritis/arthritis. * Continuous enrollment for at least one year in a Humana Medicare Advantage plan which provides free SilverSneakers access and both medical and prescription drug coverage. * Not currently or previously enrolled in SilverSneakers. * Speak English or Spanish. * Physical/mental capacity to provide informed consent, based on not having an ICD-9 or ICD-10 code for dementia and being able to answer three questions to verify comprehension of the informed consent form. Exclusion Criteria: * Another person in the same household is enrolling/enrolled in the study (to prevent treatment contamination, only one participant per household can participate). * Medicare/Medicaid dual enrollment due to limited data accessibility for this group. * Receiving hospice care or under long-term institutional care (Part C) due to limited data accessibility for this group. * Receiving care from a provider credentialed through a delegated arrangement (i.e., delegated provider), due to limited data accessibility for this group. * Lack of a valid mailing address in the Humana medical claims databases.