I get Medicare, SSI, SS and Medicaid. I live in CA, and Medicaid is known as Medi-Cal/Partnership. All my medical bills are paid in full, including therapists/shrinks. Medicare usually only pays around 80% of medical bills unless you can afford to pay for the extra premiums. In my case, Medi-Cal picks up where Medicare leaves off. Also, docs only accept the amount Medicare is willing to pay, not the full amount they would normally charge.
Medicare also has drug programs for 'us' poor folks to pay for all our meds. Only $1.25 co-pays for generic meds.....little more for brand names. Fortunately I have all generic.