Includes
Physicians (MD & DO) and Physician Assistants working in Cardiology and Interventional Cardiology, Cardiac Catheterization Technologist, Cardiovascular/Echocardiographer Technologist, and telemetry technicians.

Excludes
Cardiothoracic Surgeons (Q524), Interventional Radiologist (Q522), Vascular Surgeons (Q523 Surgery), Registered nurses (RNs), Licensed Practical/Vocational Nurses (LPN/LVN), Medical Assistant, Nursing Assistant, Advanced Practice Registered Nurses (APRN), and Clinical Nurse Specialists (also APRNs) (Q401, Nursing), Surgical Technologist (Q523 Surgery), Radiology Technician or Technologist (Q522 Radiology) and Medical and Surgical Equipment, Instruments and Supplies (6515).

Possible NAICS Codes
621111 – Offices of Physicians (except Mental Health Specialists)
611310 – Colleges, Universities, and Professional Schools
561320 – Temporary Help Services
621999 – All Other Miscellaneous Ambulatory Health Care Services
621399 – Offices of All Other Miscellaneous Health Practitioners
621511 – Medical Laboratories
621512 – Diagnostic Imaging Centers
622110 – General Medical and Surgical Hospitals
541990 – All Other Professional, Scientific, and Technical Services
811210 – Electronic and Precision Equipment Repair and Maintenance