Medicare for All (M4A) proposals (Sanders, Jayapal) would expand Medicare to cover every U.S. resident, eliminate most private insurance, and pay providers at single negotiated rates. Coverage would include comprehensive medical, mental health, dental, and vision care with no premiums, deductibles, or copays.
Cost estimates vary widely. CBO and similar analyses generally find total national health spending would change modestly (savings on administration and drug prices roughly offset by higher utilization), but federal spending would rise substantially — requiring significant new revenue (payroll taxes, wealth taxes, premium replacement).
Defenders argue M4A delivers universal coverage at lower per-capita cost than the U.S. fragmented system. Critics argue it disrupts existing coverage 160 million Americans like, requires unprecedented tax increases, and could reduce provider supply.