This page compares two distinct NUCC-taxonomy specialties tracked by the CMS National Plan and Provider Enumeration System: Cardiovascular Invasive Specialist/Technologist, which currently counts 86 enrolled providers across 23 U.S. states and territories, and Sonography Specialist/Technologist Cardiovascular, with 351 providers across 45 states. Each clinician on these rosters selected a primary NUCC code at NPI enrollment, so the totals measure how many providers self-identify their primary practice as Cardiovascular Invasive Specialist/Technologist or Sonography Specialist/Technologist Cardiovascular rather than the total population ever trained or credentialed in either field — dual-certified clinicians show up under whichever code they registered first.

On national volume, Sonography Specialist/Technologist Cardiovascular carries the larger provider roster (351 vs 86), and Sonography Specialist/Technologist Cardiovascular has the wider geographic footprint at 45 states versus 23. The top Cardiovascular Invasive Specialist/Technologist concentration sits in Colorado (37 providers), while Sonography Specialist/Technologist Cardiovascular peaks in California (53). The per-capita columns in the table below normalize each state's raw count against 2023 Census population estimates, which matters because absolute provider counts track population scale first and specialty density second — a small state with a strong training pipeline can out-rank a larger state on per-100K availability.

Use this comparison to understand relative availability, not to judge clinical substitutability — Cardiovascular Invasive Specialist/Technologist and Sonography Specialist/Technologist Cardiovascular are distinct specialties with different scopes of practice, training requirements, and conditions they treat, even when their NUCC categories overlap. Important: PlainDoctor is a directory of publicly available CMS government data, not medical advice, a provider rating, or a recommendation about which specialty a patient should consult. Always work with a licensed clinician to determine which specialty is appropriate for your condition, verify any specific provider through the NPPES NPI Registry and the relevant state medical board, and consult the NUCC taxonomy documentation for the formal scope-of-practice definitions behind each specialty code.