Version-pinned public dataset · 3,144 counties and county equivalents
Area-level cardiology access indicators, mapped with reproducible public data.
An interactive atlas of qualifying NPPES-listed provider locations, great-circle distance, Critical Access Hospitals, CDC PLACES adult coronary-heart-disease prevalence, and primary-care HPSA evidence. Companion to the peer-reviewed HEARTLAND Protocol.
Under the preregistered address-geocoding and fallback rules, 1,869 of 3,144 counties and county equivalents in the 50 states and District of Columbia (59.4%) had no qualifying provider assigned in the June 8, 2026 NPPES snapshot. Aggregate public data only; no patient health information.
Areas with zero qualifying providers
1,869
of 3,144 (59.4%)
Median distance — rural areas
25.2 mi
raw-first median across 1,958 evaluable areas
CAHs ≥20 mi from a qualifying provider
909
66.3% among 1,372 evaluable in-scope CAHs
Population in zero-provider areas
34,233,412
residents of areas with zero qualifying providers
How this map is built
The Atlas counts NPPES-listed individual providers with an active NPI record and a primary adult-cardiology taxonomy. Practice addresses are assigned directly with the pinned Census Batch Geocoder when valid; unsuccessful or ineligible addresses with a valid ZIP use the preregistered same-state HUD-USPS business-ratio fallback. Great-circle distance from the Census county internal point to the nearest canonical qualifying-provider location; it is not road distance or travel time. Full methodology.