US Ambulatory Surgery Centers
U.S. Location Dataset // 6,640

All 6,640 Medicare-certified ambulatory surgery centers in the United States, with CMS Certification Number, street address, phone and ownership. ASCs are where an increasing share of US surgical volume has moved as procedures shift out of hospitals, which makes them the fastest-growing buyer group in medical devices, surgical supplies, sterilisation, anaesthesia and practice-management software. They are also intensely consolidated by physician groups, hospital systems and private equity, so mapping the universe is the first step in any roll-up or partnership strategy. Because these are federally certified, the file is authoritative and the certification number joins to CMS quality and utilisation data. Refreshed weekly.

All 6,640 records, as published — the complete set rather than a sample. That matters most for coverage and gap questions: put together the same list from partial searches and every location you miss reads as a gap that is not there, so the answer is wrong rather than merely late. Assembling the U.S.-wide coverage by hand also means one query per area against sources that cap what they return per search.