Health Service Psychologist
NUCC 103TH0100X · Psychologist
935 CMS NPPES-registered providers across 49 states · 275th of 690 specialties by headcount.
Where this specialty sits in the corpus
Health Service Psychologist ranks 275th of 690 NUCC specialties by CMS NPPES headcount (0.01% of all registered NPIs), densest in California; per resident District of Columbia leads.
- 935
- NPPES providers in specialty
- 275th
- of 690 specialties
- 434
- state-share HHI
- 0.1%
- Part D prescriber share
District of Columbia is densest per capita (9.1× the national rate; Massachusetts 3.9×); 0.6% of the Psychologist category.
Taxonomy fingerprint
Health Service Psychologist (NUCC 103TH0100X; 0.1% Part D prescribers (1 of 935); avg 239 Part D claims/prescriber (407th of 572); state-share HHI 434; next-larger headcount neighbor Gerontology Occupational Therapist (+4); next-smaller Sleep Medicine (Internal Medicine) Physician (-3)).
Next larger: Gerontology Occupational Therapist (939) Next smaller: Sleep Medicine (Internal Medicine) Physician (932)
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
- District of Columbia 9.1× · 2.5/100k
- Massachusetts 3.9× · 1.1/100k
- Oklahoma 3.4× · 0.9/100k
- Hawaii 3.3× · 0.9/100k
- Indiana 2.3× · 0.6/100k
Under-indexed vs national rate
- Alabama 0.35× · 0.1/100k
- New Jersey 0.35× · 0.1/100k
- Wisconsin 0.37× · 0.1/100k
- Virginia 0.42× · 0.1/100k
- South Carolina 0.47× · 0.1/100k
Which states have the most providers?
| # | State | Providers |
|---|---|---|
| 1 | California | 92 |
| 2 | Massachusetts | 75 |
| 3 | Ohio | 57 |
| 4 | North Carolina | 56 |
| 5 | Texas | 51 |
| 6 | Tennessee | 45 |
| 7 | Indiana | 44 |
| 8 | Michigan | 44 |
| 9 | Florida | 42 |
| 10 | Oklahoma | 38 |
| 11 | New York | 26 |
| 12 | Oregon | 25 |
| 13 | Illinois | 23 |
| 14 | Missouri | 21 |
| 15 | Colorado | 19 |
Top Cities for Health Service Psychologist
| # | City | Providers |
|---|---|---|
| 1 | IndianapolisIndiana | 18 |
| 2 | BostonMassachusetts | 17 |
| 3 | WashingtonDistrict of Columbia | 16 |
| 4 | Oklahoma CityOklahoma | 16 |
| 5 | PortlandOregon | 13 |
| 6 | ChicagoIllinois | 11 |
| 7 | Saint LouisMissouri | 10 |
| 8 | New YorkNew York | 10 |
| 9 | ClevelandOhio | 10 |
| 10 | NashvilleTennessee | 10 |
| 11 | DetroitMichigan | 9 |
| 12 | CharlotteNorth Carolina | 9 |
Sample Health Service Psychologist NPIs
A directory sample from this NUCC code (not a ranking). Names and locations are unique to this taxonomy.
| # | Provider |
|---|---|
| 1 | Susan Dwyer, PHD CLINICAL PSYCHOLFort Wayne, IN |
| 2 | Mark Randall, PSYD HSPPIndianapolis, IN |
| 3 | Joyce Dunfee, PHDSouth Bend, IN |
| 4 | Thomas Allen, PSYD, HSPPLa Porte, IN |
| 5 | Christopher Robinson, PH.D, MPHNellis Afb, NV |
| 6 | Lois Rifner, PH.D., HSPPBedford, IN |
| 7 | Raymond FolenHonolulu, HI |
| 8 | Kathleen Brown, PH.D.Tamc, HI |
| 9 | Michael Kellar, PSY.D.Tripler Amc, HI |
| 10 | Steven Tovian, PH.D.Highland Park, IL |
| 11 | Larry James, PH.D.Tripler Amc, HI |
| 12 | Marlin Moore, PH.D.Shreveport, LA |
| 13 | Donald McGeary, PH.D.San Antonio, TX |
| 14 | Blain Walker, PH.D.Fort Sam Houston, TX |
| 15 | Jeffrey Cigrang, PH.DLima, OH |
| 16 | Quinn Biggs, MPHOlympia Fields, IL |
| 17 | Elizabeth Hain, PH.D.Portsmouth, VA |
| 18 | Anne Dobmeyer, PH.D.Wright Patterson Afb, OH |
Related Specialties
Adjacent specialties in the NUCC Health Care Provider Taxonomy - same Psychologist category.
Compare Health Service Psychologist vs Clinical Psychologist →
Frequently Asked Questions
How should I read Health Service Psychologist's mid-pack national roster?
Where can I find a Health Service Psychologist provider?
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.