It shows that you have Part A (Hospital coverage), Part B (Medical coverage) or both. It shows what date your coverage begins.
This is also known as Original Medicare. Original Medicare does not cover everything. It does not cover prescription drugs, routine vision, eye glasses, dental, private duty nurses, or hearing aid.
I have a friend who is self-employed and asked when he turns 65 years old would he be able to keep his current coverage. The answer is no. When you turn age 65, your current carrier will ask you to enroll in their Medicare Advantage or Medicare Supplemental plan, if they are available. If not, you would need to look for a carrier that does offer Medicare health insurance coverage.