Ambulatory Care Registered Nurse
NUCC 163WP2201X · Registered Nurse
3,522 CMS NPPES-registered providers across 53 states · 155th of 690 specialties by headcount.
Where this specialty sits in the corpus
Ambulatory Care Registered Nurse ranks 155th of 690 NUCC specialties by CMS NPPES headcount (0.05% of all registered NPIs), densest in California; per resident South Dakota leads.
- 3,522
- NPPES providers in specialty
- 155th
- of 690 specialties
- 983
- state-share HHI
- 4.3%
- Part D prescriber share
South Dakota is densest per capita (8.8× the national rate; North Dakota 5.6×); 1.2% of the Registered Nurse category.
Taxonomy fingerprint
Ambulatory Care Registered Nurse (NUCC 163WP2201X; 4.3% Part D prescribers (153 of 3,522); avg 799 Part D claims/prescriber (203rd of 572); Open Payments avg $615/physician (334th of 551; 111 paid, $68K total); state-share HHI 983; next-larger headcount neighbor Prosthodontics (+28); next-smaller Audiologist-Hearing Aid Fitter (-18)).
Next larger: Prosthodontics (3,550) Next smaller: Audiologist-Hearing Aid Fitter (3,504)
Population-adjusted state index
Each multiple is this specialty's providers-per-resident in a state divided by the national rate (Census Vintage population estimates). Raw headcount favors large states; this ranking surfaces denser markets.
Over-indexed vs national rate
- South Dakota 8.8× · 9.1/100k
- North Dakota 5.6× · 5.9/100k
- New Mexico 4.6× · 4.8/100k
- Wisconsin 2.5× · 2.6/100k
- Wyoming 2.5× · 2.6/100k
Under-indexed vs national rate
- Connecticut 0.19× · 0.2/100k
- Louisiana 0.19× · 0.2/100k
- New Jersey 0.19× · 0.2/100k
- South Carolina 0.21× · 0.2/100k
- Mississippi 0.26× · 0.3/100k
Which states have the most providers?
| # | State | Providers |
|---|---|---|
| 1 | California | 986 |
| 2 | Ohio | 210 |
| 3 | Massachusetts | 177 |
| 4 | Texas | 167 |
| 5 | Wisconsin | 152 |
| 6 | Michigan | 130 |
| 7 | Colorado | 115 |
| 8 | New Mexico | 102 |
| 9 | New York | 101 |
| 10 | South Dakota | 84 |
| 11 | Arizona | 81 |
| 12 | Washington | 80 |
| 13 | Minnesota | 76 |
| 14 | Florida | 72 |
| 15 | Indiana | 69 |
Top Cities for Ambulatory Care Registered Nurse
| # | City | Providers |
|---|---|---|
| 1 | Los AngelesCalifornia | 277 |
| 2 | OaklandCalifornia | 78 |
| 3 | TorranceCalifornia | 74 |
| 4 | ColumbusOhio | 62 |
| 5 | TomahWisconsin | 58 |
| 6 | Van NuysCalifornia | 52 |
| 7 | SylmarCalifornia | 51 |
| 8 | San AntonioTexas | 48 |
| 9 | BostonMassachusetts | 43 |
| 10 | San FranciscoCalifornia | 38 |
| 11 | Ann ArborMichigan | 38 |
| 12 | AlbuquerqueNew Mexico | 38 |
Sample Ambulatory Care Registered Nurse NPIs
A directory sample from this NUCC code (not a ranking). Names and locations are unique to this taxonomy.
| # | Provider |
|---|---|
| 1 | Arlene Kasten, APRNMilwaukee, WI |
| 2 | Lauriann Broad, FNPCHonolulu, HI |
| 3 | Carolyn Marshall, CRNARichmond, VA |
| 4 | Gloria Cooper, CRNARichmond, VA |
| 5 | Gina Bartolo, CRNARichmond, VA |
| 6 | Janet Harvey, CRNARichmond, VA |
| 7 | Richard Henighan, APRN, BC, FNPSevierville, TN |
| 8 | Bonnie Talaski, RNAlpena, MI |
| 9 | Johnna Dettis, ARNPFort Myers, FL |
| 10 | Connie Nelson, RNPlummer, ID |
| 11 | Ada Denny, RNPlummer, ID |
| 12 | Mary Rickard, RNPearl Harbor, HI |
| 13 | Amy Wagar, RNPearl Harbor, HI |
| 14 | Darcy Humphrey, RNPlummer, ID |
| 15 | Susan Bates, RNPlummer, ID |
| 16 | Robert Bowman, RNFort Belvoir, VA |
| 17 | Susan Mehta, FNPConcord, NC |
| 18 | Sheila Wilson, RNFort Myer, VA |
Related Specialties
Adjacent specialties in the NUCC Health Care Provider Taxonomy - same Registered Nurse category.
Compare Ambulatory Care Registered Nurse vs Registered Nurse →
Frequently Asked Questions
Where does the large Ambulatory Care Registered Nurse headcount concentrate?
How large is Ambulatory Care Registered Nurse's Open Payments footprint?
How heavy is Ambulatory Care Registered Nurse Part D prescribing at scale?
Data sources and methodology
Provider data from CMS NPPES (download.cms.gov/nppes). Specialty classification from NUCC Health Care Provider Taxonomy (nucc.org). Part D averages from the CMS Medicare Part D Prescriber PUF; industry payments from CMS Open Payments 2024. Counts reflect self-designated primary taxonomy at NPI enrollment. PlainDoctor does not rate or rank providers. Methodology · About
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2026-08-27.