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 76 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. Judith Oakland-Buchanan, M.A.Professional Counselor1164764296
  2. Stephen OakleyAcupuncturist1598997892
  3. Paris Obdan, NLCPsychoanalyst1972197218
  4. Reid Oberer, ODOptometrist1093831612
  5. Mark Oberg, MA, LPC, LACMental Health Counselor1417299884
  6. Danica OchoaBehavior Technician1851982698
  7. Samantha OchoaBehavior Technician1518557503
  8. Stephen Ochs, MDAnesthesiology Physician1316052681
  9. Abigail Odom, RDH, OMTDental Hygienist1437660495
  10. Rebecca Oerter, FNPPrimary Care Nurse Practitioner1841029220
  11. Carla Ogden, RNPsychiatric/Mental Health Registered Nurse1083746275
  12. Alexandra Ogsbury, LMTMassage Therapist1609348069
  13. Mikayla Oko, MA ESERecreation Therapist1356154587
  14. Erin Olander, M.S. O.T.R.Pediatric Occupational Therapist1295977486
  15. Deborah Olcott, LPCProfessional Counselor1720730435
  16. Jonathan Oldham, PTSpecialist1437332764
  17. Katherine Oleary, PTPhysical Therapist1568460392
  18. Cheryl OlinOccupational Therapist1851164693
  19. Tania OlivaresMental Health Counselor1316290273
  20. Susan Oliver, M.D.Psychiatry Physician1578729562
  21. Molly OlkMental Health Counselor1891069175
  22. Gregg Olsen, M.D.Psychiatry Physician1366563389
  23. Margaret Olsen, LPCCMental Health Counselor1932902558
  24. Maryna Olsen, RN, BSNRegistered Nurse1952645962
  25. Beth Olson, PA-CMedical Physician Assistant1841338449
  26. Elizabeth Olson, PSY.D., LCSWPsychoanalysis Psychologist1396525028
  27. Jaret OlsonBehavior Technician1063084853
  28. Victoria Olson, LAC, LPCMental Health Counselor1871354183
  29. Kyle Olszewski, PHARMDPharmacist1659784908
  30. Philip OnMassage Therapist1538932819
  31. Alma OnassisSpecialist1346460052
  32. Terri Oneby, ODOptometrist1457462012
  33. Adam Oneil, PHDClinical Psychologist1548932106
  34. Margaret OneilRegistered Nurse1871781872
  35. Barbara Oonk, RNCNPStudent in an Organized Health Care Education/Training Program1659494003
  36. Suzanne Opfer, MACounselor1225528045
  37. Rebecca Oplinger, PHARM.D.Pharmacist1790085793
  38. Caroline OppenheimerMental Health Counselor1952618118
  39. David Oppenheimer, M.D.Diagnostic Radiology Physician1700851250
  40. Vanessa Oren, NPFamily Nurse Practitioner1487924767
  41. Barbara Ori, LMFTMarriage & Family Therapist1093239154
  42. Timothy Oringer, P.A.Physician Assistant1164779955
  43. Margaret Orkild, P.T.Physical Therapist1770791121
  44. Alexis Ornellas, LPC, LACMental Health Counselor1316352958
  45. Jenna Orosco, LPCProfessional Counselor1497205231
  46. Jason Orowitz, D.C.Chiropractor1528392834
  47. Kimberly OrozcoBehavior Technician1902550155
  48. Camilo Ortega, M.D.Internal Medicine Physician1780971853
  49. Louise OrtegaMental Health Counselor1134353212
  50. Norma Ortega, CNAMental Health Counselor1437450806

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.