Aetna sells three plans to new enrollees that help pay for skilled nursing and rehab care for up to 90 days following a qualifying hospitalization: Plans D, G, and N. Aetna also operates Plan C and F, which also cover Medicare-qualifying skilled nursing and rehab care. But those two plans are closed to new enrollees.
Neither Medicare nor Medicare supplement insurance covers long-term custodial care for chronic conditions. To pay for that, you may want to consider long-term care insurance, or a hybrid life and long-term care insurance policy.