Ambulatory Care Registered Nurse providers in the U.S.
3,308 NPPES records list ambulatory care registered nurse as their primary taxonomy, about 1.0 per 100,000 residents; South Dakota and North Dakota have the most per resident. 26 of them appear in the Medicare Part D prescriber file: a registry record is not proof of an active practice.
What taxonomy code 163WP2201X means
163WP2201X is the National Uniform Claim Committee code for Registered Nurse, Ambulatory Care, in the grouping Nursing Service Providers. 3,308 NPPES records list it as their primary taxonomy (file of Aug 9, 2026).
Source: NUCC Health Care Provider Taxonomy code set, definition as NUCC publishes it (nucc.org); counts from CMS NPPES.
Most per resident: the 8 highest
Source: CMS NPPES, primary taxonomy 163WP2201X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.
Los Angeles has the most, 272
Source: CMS NPPES, primary taxonomy 163WP2201X by practice city, file of Aug 9, 2026.
All 51 by state
| State | Records | Per 100,000 |
|---|---|---|
| Alabama | 18 | 0.4 |
| Alaska | 19 | 2.6 |
| Arizona | 79 | 1.1 |
| Arkansas | 9 | 0.3 |
| California | 940 | 2.4 |
| Colorado | 112 | 1.9 |
| Connecticut | 6 | 0.2 |
| Delaware | 4 | 0.4 |
| District of Columbia | 8 | 1.2 |
| Florida | 59 | 0.3 |
| Georgia | 40 | 0.4 |
| Hawaii | 18 | 1.3 |
| Idaho | 26 | 1.3 |
| Illinois | 40 | 0.3 |
| Indiana | 58 | 0.8 |
| Iowa | 32 | 1.0 |
| Kansas | 51 | 1.7 |
| Kentucky | 18 | 0.4 |
| Louisiana | 8 | 0.2 |
| Maine | 4 | 0.3 |
| Maryland | 22 | 0.4 |
| Massachusetts | 164 | 2.3 |
| Michigan | 130 | 1.3 |
| Minnesota | 71 | 1.2 |
| Mississippi | 7 | 0.2 |
| Missouri | 60 | 1.0 |
| State | Records | Per 100,000 |
|---|---|---|
| Montana | 14 | 1.2 |
| Nebraska | 38 | 1.9 |
| Nevada | 14 | 0.4 |
| New Hampshire | 8 | 0.6 |
| New Jersey | 15 | 0.2 |
| New Mexico | 95 | 4.5 |
| New York | 88 | 0.4 |
| North Carolina | 30 | 0.3 |
| North Dakota | 46 | 5.9 |
| Ohio | 199 | 1.7 |
| Oklahoma | 32 | 0.8 |
| Oregon | 59 | 1.4 |
| Pennsylvania | 43 | 0.3 |
| Rhode Island | 24 | 2.2 |
| South Carolina | 12 | 0.2 |
| South Dakota | 82 | 8.9 |
| Tennessee | 35 | 0.5 |
| Texas | 159 | 0.5 |
| Utah | 12 | 0.4 |
| Vermont | 2 | 0.3 |
| Virginia | 34 | 0.4 |
| Washington | 69 | 0.9 |
| West Virginia | 6 | 0.3 |
| Wisconsin | 151 | 2.6 |
| Wyoming | 16 | 2.7 |
In federal data
- NUCC code163WP2201X · Registered Nurse
- Size rank160th of 688 specialties by records (0.05% of all)
- In its family12th of 56 Registered Nurse codes, 1.4% of the family
- Part D prescribers26 (0.8% of records)
- Part D claims469 a year per prescriber, on average (180th of 496)
- Industry payments26 physicians paid $42K in 2024, $2K each on average
- Concentration6 states hold half of all records
Source: CMS NPPES; Medicare Part D Prescriber PUF; CMS Open Payments 2024. Presence in these files is not a quality judgment.
A sample of ambulatory care registered nurse records
- Caryn Clements, RNChugiak, AK1386088664
- Denise Hendrickson, RNDillingham, AK1386472421
- Brittainy Shafer, MSN, RNEagle River, AK1891625901
- Michelle Mueller, RNEagle River, AK1326978354
- Lynn Pura, NPHomer, AK1609906379
- Judith Eller, R.N.Kodiak, AK1417933763
- Bernadette Baez, RNWasilla, AK1801103981
- Kevin Collis, RNSoldotna, AK1952670945
- Lee Wachmann, RNJuneau, AK1841407897
- Trevor Baird, RNJuneau, AK1750678116
- Keely BaumgartnerHaines, AK1538082235
- Colleen Dahlquist, RNSitka, AK1548398324
- Christine Pool, RNSitka, AK1568677789
- Laurie Johnson, RNSitka, AK1700092087
- Kathleen Moats, RNSitka, AK1326230947
- Lisa Brooks, RNSitka, AK1174708473
Registry order, not a ranking. Search by name to find one provider.
Common questions
Where does the large Ambulatory Care Registered Nurse headcount concentrate?
3,308 Ambulatory Care Registered Nurse NPIs span 53 states; California alone holds 940. Top metros include Los Angeles, CA; Oakland, CA; Torrance, CA; Columbus, OH. Nationally this is 160th of 688 NUCC codes.
How large is Ambulatory Care Registered Nurse's Open Payments footprint?
CMS Open Payments 2024 lists 26 Ambulatory Care Registered Nurse physicians totaling $42K (190 payments; average $2K, 179th of 470). Presence in Open Payments is not a quality judgment.
How heavy is Ambulatory Care Registered Nurse Part D prescribing at scale?
Among Ambulatory Care Registered Nurse NPIs, 26 appear in the Medicare Part D Prescriber PUF (average 469 claims and $43K drug cost per prescriber; 180th of 496 specialties by average claims). Non-prescribing clinicians in the same NUCC code are still in NPPES.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy (nucc.org); Medicare Part D Prescriber PUF; CMS Open Payments 2024. Counts are self-designated primary taxonomy, not board certification.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.