SSM Health Plan is an HMO/HMO-POS with a Medicare contract. Enrollment in SSM Health Plan depends on contract renewal. SSM Health Plan markets under the name WellFirst Health — Provided by SSM Health Plan. This information is not a complete description of benefits. Call 833-551-0565 (TTY: 711) for more information. You must continue to pay your Medicare Part B premium. Every year, Medicare evaluates plans based on a 5-star rating system