Oncology Registered Nurse
NUCC 163WX0200X · Registered Nurse
1,025 CMS NPPES-registered providers across 51 states · 260th of 690 specialties by headcount.
Where this specialty sits in the corpus
Oncology Registered Nurse ranks 260th of 690 NUCC specialties by CMS NPPES headcount (0.01% of all registered NPIs), densest in California; per resident Colorado leads.
- 1,025
- NPPES providers in specialty
- 260th
- of 690 specialties
- 419
- state-share HHI
- 17.1%
- Part D prescriber share
Colorado is densest per capita (5× the national rate; Nebraska 4.2×); 0.4% of the Registered Nurse category.
Taxonomy fingerprint
Oncology Registered Nurse (NUCC 163WX0200X; 17.1% Part D prescribers (175 of 1,025); avg 687 Part D claims/prescriber (243rd of 572); Open Payments avg $1K/physician (250th of 551; 149 paid, $176K total); state-share HHI 419; next-larger headcount neighbor Legal Medicine (+20); next-smaller Allergy Physician (-10)).
Next larger: Legal Medicine (1,045) Next smaller: Allergy Physician (1,015)
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
- Colorado 5× · 1.5/100k
- Nebraska 4.2× · 1.3/100k
- Alaska 3.1× · 1/100k
- Massachusetts 2.3× · 0.7/100k
- Oregon 1.8× · 0.5/100k
Which states have the most providers?
| # | State | Providers |
|---|---|---|
| 1 | California | 91 |
| 2 | Colorado | 89 |
| 3 | Texas | 70 |
| 4 | New York | 67 |
| 5 | Massachusetts | 49 |
| 6 | Ohio | 42 |
| 7 | Illinois | 39 |
| 8 | Florida | 36 |
| 9 | Pennsylvania | 36 |
| 10 | Virginia | 32 |
| 11 | Washington | 31 |
| 12 | Indiana | 30 |
| 13 | Michigan | 28 |
| 14 | New Jersey | 28 |
| 15 | Georgia | 26 |
Top Cities for Oncology Registered Nurse
| # | City | Providers |
|---|---|---|
| 1 | New YorkNew York | 31 |
| 2 | DenverColorado | 27 |
| 3 | BostonMassachusetts | 24 |
| 4 | San AntonioTexas | 21 |
| 5 | LincolnNebraska | 19 |
| 6 | ColumbusOhio | 18 |
| 7 | LafayetteColorado | 17 |
| 8 | ChicagoIllinois | 17 |
| 9 | HoustonTexas | 16 |
| 10 | SeattleWashington | 15 |
| 11 | IndianapolisIndiana | 13 |
| 12 | NashvilleTennessee | 12 |
Sample Oncology Registered Nurse NPIs
A directory sample from this NUCC code (not a ranking). Names and locations are unique to this taxonomy.
| # | Provider |
|---|---|
| 1 | Linda Stearns, ARNPClearwater, FL |
| 2 | Marcia Lahaie, N.P.Canton, MI |
| 3 | Deborah Olszewski, CNPDetroit, MI |
| 4 | Adrienne Cacavio, NPNew York, NY |
| 5 | Patricia Nishimoto, RNHonolulu, HI |
| 6 | Suzanne Mahon, RN DNSC AOCN APNGSt Louis, MO |
| 7 | Dianne Harrison, RN, MSCN, AOCN, APNCHackensack, NJ |
| 8 | Lydia Sar, RNLas Angeles, CA |
| 9 | Andrew Guinigundo, CNPCincinnati, OH |
| 10 | Patricia Williams, APRNVidalia, GA |
| 11 | Elizabeth Morgan, A.R.N.P.Brooksville, FL |
| 12 | Anne Elperin, M.S.N., N.P.Boston, MA |
| 13 | Marianne Tawa, NPBoston, MA |
| 14 | Mary Rapp, NPBoston, MA |
| 15 | Dana AyerColorado Springs, CO |
| 16 | Leona Anderson, DNP, AGPCNP-CGlendale, OR |
| 17 | Ruth Gholz, RN MS AOCNCincinnati, OH |
| 18 | Jan Maxson, CNPCleveland, OH |
Related Specialties
Adjacent specialties in the NUCC Health Care Provider Taxonomy - same Registered Nurse category.
Frequently Asked Questions
How should I read Oncology Registered Nurse's mid-pack national roster?
How does Oncology Registered Nurse show up in Open Payments mid-pack?
How much Part D prescribing does this specialty do?
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.