NPPES file of Aug 9, 2026

Doctors and health care providers in Boulder, CO

5,635 individual NPPES records list a practice address in Boulder, 5th of 193 Colorado cities. The largest group is mental health counselor: 1,009, 18% of the city's records, against 6% across Colorado. Page 40 of 113.

CMS NPPES registry, file of Aug 9, 2026 · method · Verify with CMS →

The 8 largest groups in Boulder

Source: CMS NPPES primary taxonomy, file of Aug 9, 2026.

Boulder in Colorado

  • Rank in Colorado5th of 193 cities by records
  • Share of the state3.8% of Colorado's records
  • Specialties present25 or more taxonomy codes
  • Top three groups29.4% of all records
  • Mental Health Counselor rank2nd of the 10 Colorado cities with the most

Compared with Colorado as a whole, Boulder has 3.9× the state's share of acupuncturist records and 0.47× its share of behavior technician records.

Providers in Boulder, alphabetically

  1. Ben GreenfieldHealth Educator1356934012
  2. Ellen Greenhouse, PH.D.Clinical Psychologist1124176318
  3. Sara Greenlee, LCSWClinical Social Worker1356097232
  4. Rosemary Greenslade, M.D.Adult Medicine Physician1134245319
  5. Valerie Greenslade, PAPhysician Assistant1457072761
  6. Debra Greenstein, M.D.Pediatrics Physician1093779530
  7. Lauren Greenwell, CAC IAddiction (Substance Use Disorder) Counselor1669723235
  8. Kelly GreggPediatric Occupational Therapist1942766076
  9. Amber Greves, M.S. CCC-SLPSpeech-Language Pathologist1750620365
  10. Karen Grey, M.S., L.P.C.C.Professional Counselor1619776291
  11. Ariel GriffinPhysician Assistant1801412267
  12. Caleb GriffinMassage Therapist1700232238
  13. Dina Griffin, RDRegistered Dietitian1275782682
  14. Julie Griffin, PTPhysical Therapist1285768283
  15. Lucinda Griffith, NPPsychiatric/Mental Health Nurse Practitioner1477857175
  16. Mary Griffith, MA, LPCProfessional Counselor1760268411
  17. Sue Griffith, P.A.Physician Assistant1134103286
  18. Samantha Grigsby, PHDClinical Psychologist1427514231
  19. Laurie Grimm, MS, CCC-SLPSpeech-Language Pathologist1548602337
  20. Margaret GrinnellPeer Specialist1487052569
  21. Aaron Grobler, LPCCProfessional Counselor1972497048
  22. Jennifer Grodberg, MDInternal Medicine Physician1114067097
  23. Hunter GroganBehavior Technician1669282901
  24. Cliff Gronseth, MDPhysical Medicine & Rehabilitation Physician1811983802
  25. Thomas Groover, DCChiropractor1417047051
  26. Jenna Groshong, CAC IIAddiction (Substance Use Disorder) Counselor1922413681
  27. Lesli Groshong, DVMVeterinarian1073929592
  28. Steven Gross, M.D.Orthopaedic Surgery Physician1639344351
  29. Simsimran Grover, M.D.Internal Medicine Physician1992141923
  30. Forrest Groves, BA DDSPublic Health Dentistry1730180506
  31. Shauna GrovesClinical Social Worker1366602823
  32. Barton Grow, MA, NCC, LCPC, MISAProfessional Counselor1225101520
  33. Johanna GrubeProfessional Counselor1790276624
  34. Jason Gruhl, MACounseling Psychologist1023993524
  35. Linda Gruidel, RNRegistered Nurse1902084338
  36. Samantha GrunderBehavior Technician1740060870
  37. Diana Grushan, RNAmbulatory Women's Health Care Registered Nurse1366858136
  38. Ruby GuardadoCase Manager/Care Coordinator1891506374
  39. Barbara GuastellaMental Health Counselor1861554131
  40. Lindsay Guber, OTR/LOccupational Therapist1518444785
  41. Saanvi GudreddiBehavior Technician1013721976
  42. Susan Guegan, NC, CHCNutrition Education Nutritionist1124717095
  43. Rebecca Guidera, MA, LPCCounselor1245955780
  44. Steven Guigelaar, R.N.Registered Nurse1083025852
  45. Katherine Guinn, M.A., CCC-SLPSpeech-Language Pathologist1275196958
  46. Caurel Gulbranson, MA, CCC-SLPSpeech-Language Pathologist1851423966
  47. Joshua Gumpert, PA-CPhysician Assistant1922541986
  48. Lindsey Gunay, PA-CPhysician Assistant1568855575
  49. Jeffrey Gunter, M.D.Emergency Medical Services (Emergency Medicine) Physician1023058047
  50. Kevin GuptonHome Modifications Contractor1659868792

The largest Colorado cities

  1. Denver25,068
  2. Colorado Springs19,771
  3. Aurora17,400
  4. Fort Collins6,928
  5. Lakewood4,944

All of Colorado →

How to read this directory

Boulder, Colorado appears in the CMS National Plan and Provider Enumeration System with 5,635 registered healthcare providers spanning 25 or more distinct NUCC-taxonomy specialties. This count includes every individual clinician who has applied for an NPI and listed a practice address in Boulder - physicians, dentists, nurse practitioners, physician assistants, chiropractors, physical therapists, optometrists, psychologists, podiatrists, and every other credentialed provider type CMS tracks. It does not measure hospital beds, urgent-care capacity, or whether a given clinic is accepting new patients; it measures the pool of professionals with current NPI enrollment and a Boulder practice location on file. Every figure is drawn from the federal National Provider Identifier Registry (CMS NPPES) - more than 7 million providers, maintained since May 2007, with 2024 Medicare Part D data, and, according to CMS, can be searched, compared, and traced in our methodology.

The provider mix in Boulder is weighted toward Mental Health Counselor (1,009 clinicians, followed by Professional Counselor with 334 and Clinical Social Worker with 316). That distribution reflects how NPPES records specialty: providers self-select a primary taxonomy code, so a family physician who also practices geriatrics will show up under whichever NUCC code they registered first. Relative to Colorado's population, Boulder reports roughly 95.9 providers per 100,000 residents using the state-level denominator, which is a rough proxy rather than a precise access-to-care measurement; the true catchment area of any {cityName} clinician extends beyond the municipal boundary.

Of Colorado's most common specialties, Student in an Organized Health Care Education/Training Program is the most prominent one with no provider currently listing a Boulder practice address, a coverage gap Boulder patients typically fill by traveling to a larger nearby hub.

For Boulder patients, this directory is most useful as a starting shortlist. Important: PlainDoctor is a directory of publicly available CMS government data, not a review site, a ranking, or medical advice. NPPES data is self-reported and refreshed monthly; call the practice directly to confirm the provider is still there, accepts your insurance, and is taking new patients.

For informational purposes only; this directory is not medical advice and not a substitute for checking a license. See also: how to find a doctor and how to verify one.

Common questions

How many doctors are in Boulder, CO?

There are 5,635 registered healthcare providers in Boulder, CO, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in Boulder?

The most common specialties in Boulder are Mental Health Counselor, Professional Counselor, Clinical Social Worker, Physical Therapist, Behavior Technician. Mental Health Counselor has the most providers with 1,009.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov). Records are self-reported registrations, not licenses.

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.