Ambulatory Health Care Data
The National Hospital Ambulatory Medical Care Survey (NHAMCS) is designed to collect data on the utilization and provision of ambulatory care services in hospital emergency and outpatient departments and ambulatory surgery locations. Findings are based on a national sample of visits to the emergency departments, outpatient departments, and ambulatory surgery locations of noninstitutional general and short-stay hospitals.
The National Health Care Surveys (including NAMCS, NHAMCS, and NHCS) are working with the Centers for Medicare and Medicaid Services Electronic Health Record Incentive Programs: Promoting Interoperability (PI) (formerly known as Meaningful Use (MU)) and the Merit-based Incentive Payment System (MIPS). Click here to find out more.
- 2021 NHAMCS Emergency Department Summary Tables [PDF – 831 KB]
NOTE: Table 1 of this document was revised on October 11, 2023, to correct visit estimates for nursing home and homeless patients and update footnotes 2 and 3. (10/13/2023)
- National estimates of office-based physician characteristics and practice characteristics by physician type [PDF – 118 KB] (8/2023)
- 2021 NHAMCS Emergency Department Public Use File (7/10/2023)
- 2021 Data Available on Emergency Visits (7/10/2023)
- Emergency Department Visits Related to Mental Health Disorders Among Children and Adolescents: United States, 2018–2021 (10/24/2023)
- Emergency Department Visit Rates for Assault: United States, 2019–2021 (10/12/2023)
- Emergency Department Visit Rates by Selected Characteristics: United States, 2021( 8/24/2023)
- Sampling Procedures for the Collection of Electronic Health Record Data From Federally Qualified Health Centers, 2021–2022 National Ambulatory Medical Care Survey (6/26/2023)
- Emergency Department Visits Among Children Aged 0–17 by Selected Characteristics: United States, 2019–2020 (6/6/2023)
- Emergency Department Visit Rates for Motor Vehicle Crashes by Selected Characteristics: United States, 2019–2020 (4/21/2023)
- Characteristics of Office-based Physician Visits by Age, 2019 [PDF – 412 KB] (4/19/2023)