Plans in the Marketplace are primarily separated into 4 health plan categories — Bronze, Silver, Gold, or Platinum — based on the percentage the plan pays of the average overall cost of providing essential health benefits to members. The plan category you choose affects the total amount you’ll likely spend for essential health benefits during the year. The percentages the plans will spend, on average, are 60% (Bronze), 70% (Silver), 80% (Gold), and 90% (Platinum). This isn’t the same as coinsurance, in which you pay a specific percentage of the cost of a specific service.

References

https://www.healthcare.gov/glossary/health-plan-categories/