NPPES file of Aug 9, 2026

Doctors and health care providers in Gaithersburg, MD

2,580 individual NPPES records list a practice address in Gaithersburg, 9th of 284 Maryland cities. The largest group is behavior technician: 580, 22% of the city's records, against 16% across Maryland. Page 35 of 52.

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

The 8 largest groups in Gaithersburg

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

Gaithersburg in Maryland

  • Rank in Maryland9th of 284 cities by records
  • Share of the state1.6% of Maryland's records
  • Specialties present25 or more taxonomy codes
  • Top three groups36.3% of all records
  • Behavior Technician rank7th of the 10 Maryland cities with the most

Compared with Maryland as a whole, Gaithersburg has 2.5× the state's share of acupuncturist records and 0.26× its share of home health aide records.

Providers in Gaithersburg, alphabetically

  1. Zoe O'Brien, CRNPPediatric Nurse Practitioner1205915766
  2. Kelsey O'Donnell, LCSW-CClinical Social Worker1932684362
  3. William O'Loughlin, DCChiropractor1225127384
  4. Isaac O'NealBehavior Technician1760366595
  5. Jacob O'NeilBehavior Technician1205784105
  6. Melissa O'Neill, M.S. CCC-SLPSpeech-Language Pathologist1013478197
  7. Mario Obando RodriguezAddiction (Substance Use Disorder) Counselor1033052881
  8. Loriann Oberlin, LCPCProfessional Counselor1457525024
  9. Catherine Obrocea, PSY.D.Clinical Neuropsychologist1245214840
  10. Samantha Ocrospoma RomanBehavior Technician1770309452
  11. Catheline Odia, FNPFamily Nurse Practitioner1942882865
  12. Estherla OforiBehavior Technician1790628618
  13. Olufemi OgunderoBehavior Technician1326839192
  14. Uduak Ibanga OgunsiakanRegistered Nurse1972036424
  15. Miriam OkekeBehavior Technician1902798465
  16. Merab OkeyoFamily Nurse Practitioner1821540576
  17. Pauline OkeyoLicensed Practical Nurse1992194625
  18. Dick Okino, DPMPodiatrist1124016506
  19. Chukwunonyeluanyi Okocha, MDObstetrics & Gynecology Physician1669578597
  20. Richard OkonkwoBehavior Technician1356229538
  21. Jordan OkuBehavior Technician1184428393
  22. Ganiyat Oladapo, M.D.Family Medicine Physician1578957932
  23. Nwando OlisaClinical Social Worker1548929664
  24. Melissa OlsenPharmacist1558818369
  25. Folake Olubasusi, RN, MSN, FNP-BCSurgery Physician1912525114
  26. Paula OluwaseyiBehavior Technician1093644718
  27. Kathryn Omerso, LMSWSocial Worker1306513932
  28. Wendy Ominsky, L.C.S.W.-C.Clinical Social Worker1144230137
  29. Alvin OngPhysical Therapist1255923397
  30. Halie OnigoaieBehavior Technician1740009737
  31. Philomene OnokokoBehavior Technician1497550651
  32. Onyekachi OnyekwereMental Health Counselor1558196642
  33. Karen Orloff, PSYDPsychologist1962565663
  34. Beverly Ornberg, PHDPsychologist1851416549
  35. Alan Oroxom, M.D.Anatomic Pathology & Clinical Pathology Physician1790770410
  36. Michael Orr, DCChiropractor1124156575
  37. David Ortega-Navas, R.N.Registered Nurse1699102392
  38. Elizabeth Ortiz Rios, M.D., M.P.H.Pediatrics Physician1588870265
  39. Sarah Osborn, LMSWClinical Social Worker1417439431
  40. Natalie Osoria, LCSWClinical Social Worker1861017121
  41. Mecca PageBehavior Technician1508696337
  42. Kristopher Paik, D.M.D. M.SOral and Maxillofacial Surgery (Dentist)1083030225
  43. Emily PakPharmacist1336498856
  44. Melissa PalaciosBehavior Technician1285453191
  45. Brionna PalmerBehavior Technician1730886359
  46. Chante PalmerBehavior Technician1780433425
  47. Richard Palmer, M.D.Psychiatry Physician1881634046
  48. Gratziella Palza, RNRegistered Nurse1922347715
  49. Liliane Pami, RVTTechnician/Technologist1194659748
  50. Heidi PantherOccupational Therapist1942955463

The largest Maryland cities

  1. Baltimore35,183
  2. Rockville14,353
  3. Bethesda7,245
  4. Columbia6,690
  5. Silver Spring6,531

All of Maryland →

How to read this directory

Gaithersburg, Maryland appears in the CMS National Plan and Provider Enumeration System with 2,580 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 Gaithersburg - 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 Gaithersburg 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 Gaithersburg is weighted toward Behavior Technician (580 clinicians, followed by Clinical Social Worker with 221 and Social Worker with 135). 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 Maryland's population, Gaithersburg reports roughly 41.7 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.

For Gaithersburg 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 Gaithersburg, MD?

There are 2,580 registered healthcare providers in Gaithersburg, MD, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in Gaithersburg?

The most common specialties in Gaithersburg are Behavior Technician, Clinical Social Worker, Social Worker, Pharmacist, Mental Health Counselor. Behavior Technician has the most providers with 580.

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.