National totals
| Active NPI records | 3,196 |
| Registered sole proprietors | 800 (25.0%) |
| NUCC taxonomy code | 163WP2201X |
| Grouping | Nursing 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
| State | Active NPIs | Sole proprietors | Share |
|---|---|---|---|
| California | 971 | 235 | 24.2% |
| Ohio | 179 | 52 | 29.1% |
| Massachusetts | 168 | 42 | 25.0% |
| Texas | 159 | 35 | 22.0% |
| Colorado | 109 | 41 | 37.6% |
| New Mexico | 102 | 21 | 20.6% |
| New York | 96 | 32 | 33.3% |
| Michigan | 88 | 20 | 22.7% |
| Arizona | 81 | 14 | 17.3% |
| Washington | 73 | 17 | 23.3% |
| Florida | 67 | 28 | 41.8% |
| Indiana | 62 | <11 | not reported |
| Missouri | 62 | 12 | 19.4% |
| South Dakota | 61 | 11 | 18.0% |
| Kansas | 54 | <11 | not reported |
| Oregon | 53 | <11 | not reported |
| Pennsylvania | 51 | 18 | 35.3% |
| Georgia | 47 | 22 | 46.8% |
| Wisconsin | 46 | <11 | not reported |
| Virginia | 43 | <11 | not reported |
| Illinois | 42 | 14 | 33.3% |
| Tennessee | 40 | <11 | not reported |
| North Carolina | 36 | <11 | not reported |
| Nebraska | 35 | 13 | 37.1% |
| Oklahoma | 31 | 11 | 35.5% |
| Minnesota | 29 | <11 | not reported |
| Maryland | 28 | <11 | not reported |
| Idaho | 26 | <11 | not reported |
| North Dakota | 26 | <11 | not reported |
| Iowa | 26 | <11 | not reported |
| Rhode Island | 22 | <11 | not reported |
| Hawaii | 20 | <11 | not reported |
| Alabama | 20 | <11 | not reported |
| Kentucky | 20 | <11 | not reported |
| New Jersey | 17 | <11 | not reported |
| Alaska | 15 | <11 | not reported |
| Wyoming | 15 | <11 | not reported |
| Montana | 12 | <11 | not reported |
| Nevada | 11 | <11 | not reported |
New NPI registrations by year
| Year first enumerated | NPIs |
|---|---|
| 2016 | 88 |
| 2017 | 447 |
| 2018 | 60 |
| 2019 | 120 |
| 2020 | 112 |
| 2021 | 131 |
| 2022 | 262 |
| 2023 | 298 |
| 2024 | 308 |
| 2025 | 413 |
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
- The sole-proprietor field is self-reported by the provider in NPPES and is an imperfect proxy for private practice.
- A sole-proprietor count shown as <11 is suppressed: the true value is below 11, which could include zero.
- NPPES records and taxonomy selections can be updated, so these counts are a snapshot rather than a permanent census.
- The figures include records using this classification as the primary taxonomy; a provider may also hold other taxonomy classifications.
- Providers are counted once, by their primary taxonomy code only.
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.
Built for independent practices
Hero EMR is an EMR and practice-management platform for practices that run themselves. The first physician is free.
See a demo