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Ambulatory Care Registered Nurse: how many are there, and how many are in private practice?

Ambulatory Care Registered Nurse is a NUCC taxonomy classification within the Nursing Service Providers grouping. NUCC does not publish an official definition for this classification. This page reports 3,196 active NPI records with it as the primary taxonomy, including 800 records, or 25.0%, flagged as sole proprietors in NPPES, along with state and enumeration-year patterns.

National totals

Active NPI records3,196
Registered sole proprietors800 (25.0%)
NUCC taxonomy code163WP2201X
GroupingNursing Service Providers

Reading the sole-proprietor share

For this specialty, the 25.0% sole-proprietor share indicates how often providers report that status in NPPES, not how many operate independent or privately owned practices. Because the field is self-reported and does not fully describe ownership, employment, or organizational relationships, it is an imperfect proxy for private practice.

By state

StateActive NPIsSole proprietorsShare
California97123524.2%
Ohio1795229.1%
Massachusetts1684225.0%
Texas1593522.0%
Colorado1094137.6%
New Mexico1022120.6%
New York963233.3%
Michigan882022.7%
Arizona811417.3%
Washington731723.3%
Florida672841.8%
Indiana62<11not reported
Missouri621219.4%
South Dakota611118.0%
Kansas54<11not reported
Oregon53<11not reported
Pennsylvania511835.3%
Georgia472246.8%
Wisconsin46<11not reported
Virginia43<11not reported
Illinois421433.3%
Tennessee40<11not reported
North Carolina36<11not reported
Nebraska351337.1%
Oklahoma311135.5%
Minnesota29<11not reported
Maryland28<11not reported
Idaho26<11not reported
North Dakota26<11not reported
Iowa26<11not reported
Rhode Island22<11not reported
Hawaii20<11not reported
Alabama20<11not reported
Kentucky20<11not reported
New Jersey17<11not reported
Alaska15<11not reported
Wyoming15<11not reported
Montana12<11not reported
Nevada11<11not reported

New NPI registrations by year

Year first enumeratedNPIs
201688
2017447
201860
2019120
2020112
2021131
2022262
2023298
2024308
2025413

Counts reflect the year each NPI was first issued, among records still active today. The final year is partial: this data covers through 2026-01-11.

Data notes

Source: CMS National Plan and Provider Enumeration System (NPPES) Data Dissemination file, FOIA-disclosable public data under CMS-6060-N. Aggregated by Hero EMR on 2026-08-03; deactivated NPIs excluded; specialty assigned from the primary taxonomy code (NUCC 25.1). Counts below 11 are suppressed. Individual providers are never published. All provider data pages.

Common questions

How many Ambulatory Care Registered Nurses are there in the United States?

There are 3,196 active NPI records nationally with Ambulatory Care Registered Nurse listed as the primary taxonomy.

How many Ambulatory Care Registered Nurses are in private practice?

NPPES flags 800 records, or 25.0%, as sole proprietors. This is an imperfect proxy for private practice because the field is self-reported and does not establish actual practice ownership.

Which states have the most Ambulatory Care Registered Nurses?

The largest counts are in California with 971, Ohio with 179, Massachusetts with 168, Texas with 159, and Colorado with 109.

How many Ambulatory Care Nurse NPIs were first enumerated in recent years?

NPIs first enumerated in this classification totaled 298 in 2023, 308 in 2024, and 413 in 2025.

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