Methodology & sources

Source

Plan attributes (counts, metal tiers, plan types, issuers) come from the CMS ACA Plan Attributes Public Use File (2026 plan year, source id src:cms:aca-plan-attributes-puf:2026). Sticker (pre-subsidy) premiums come from the separate CMS Marketplace Rate PUF (source id src:cms:aca-rate-puf:2026). Both are published by the Centers for Medicare & Medicaid Services.

Grain & segmentation

The file has one row per plan variant. We segment it into medical qualified health plans (metal tiers Silver, Gold, Bronze, Expanded Bronze, Platinum, Catastrophic) and standalone dental plans (SADPs, the Low/High tiers), and we never blend them into a single "plan count". Plan counts are variant counts.

What is not in the data

• Net (post-subsidy) premiums are never estimated. We show sticker premiums — the full pre-credit price for a benchmark 40-year-old, by metal tier, from the CMS Rate PUF (federal-marketplace states only; state-based-exchange states are not in that file). What you actually pay depends on your income and current tax-credit rules — get that at HealthCare.gov.
• We show only fields that are densely populated in the source. Sparse fields are omitted rather than rendered as nulls.
• Scope is the 30 states present in this file. We state that scope literally and do not assert why a given state is or is not included.

What this is not

Coverage Atlas is a reference catalog. It informs and compares which plans exist and routes you to HealthCare.gov to act. It does not sell plans, rank plans, recommend a "best plan", or give medical, financial, or insurance advice.

Current coverage: 20,670 medical + 1,389 dental plans across 30 states. Data exported June 24, 2026.