NPPES file of Aug 9, 2026

Doctors and health care providers in Columbia, MD

6,690 individual NPPES records list a practice address in Columbia, 4th of 284 Maryland cities. The largest group is behavior technician: 2,034, 30% of the city's records, against 16% across Maryland. Page 90 of 134.

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

The 8 largest groups in Columbia

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

Columbia in Maryland

  • Rank in Maryland4th of 284 cities by records
  • Share of the state4.2% of Maryland's records
  • Specialties present25 or more taxonomy codes
  • Top three groups47.3% of all records
  • Behavior Technician rank3rd of the 10 Maryland cities with the most

Compared with Maryland as a whole, Columbia has 7.6× the state's share of registered nurse records and 0.47× its share of occupational therapist records.

Providers in Columbia, alphabetically

  1. Mevin Okpala, RBTBehavior Technician1245127059
  2. Martha OkukuRegistered Nurse1225534837
  3. Sharon OladimejiRegistered Nurse1467059246
  4. Hassanat OladosuBehavior Technician1679409833
  5. Olayinka OlakanyeBehavior Technician1730030255
  6. Blessing OlaleyeBehavior Technician1548995525
  7. Yetunde OlaleyePsychiatric/Mental Health Nurse Practitioner1558864157
  8. Raealyne Olarte, LCSW-CClinical Social Worker1598362030
  9. Oluwatomisin Olasimbo, PA-CMedical Physician Assistant1790507283
  10. Yewande Olasimbo, PA-CPhysician Assistant1265771109
  11. Brooke OldfinBehavior Technician1700485828
  12. Kionna Oleru, PHARM DPharmacist1366742421
  13. Darya Oleynik, RNRegistered Nurse1457958142
  14. Jenna OlinerArt Therapist1760328553
  15. Dakota Oliphant-LindenBehavior Technician1033874847
  16. Melissa OlisseBehavior Technician1679208417
  17. Rodra Oliver, LCSW-CClinical Social Worker1568053825
  18. Oluwaseun OlojoSpeech-Language Pathologist1417623455
  19. Promise Olomo, DNP, CRNACertified Registered Nurse Anesthetist1760911853
  20. Jozalin OlsonBehavior Technician1992639736
  21. Olawunmi OlufowobiPsychiatric/Mental Health Nurse Practitioner1316531353
  22. Bridget Olulana, PMHNP-BCPsychiatric/Mental Health Nurse Practitioner1083471791
  23. Adewumi OluwasolaBehavior Technician1215683263
  24. Karen Olvera-LoaezaBehavior Technician1780382689
  25. Eslam Omar, RPH, MPH.Pharmacist1790226132
  26. Tolulope Omojokun, MDChild & Adolescent Psychiatry Physician1083145338
  27. Mary OmoniyiBehavior Technician1467184184
  28. Raolat Omowarere, PHARMDPharmacist1407444904
  29. Sajidah Omran, PT, DPTPhysical Therapist1114635646
  30. Olanireti Onabanjo, NURSE PRACTITIONERFamily Nurse Practitioner1316156391
  31. Yewande OnabanjoBehavior Technician1841997517
  32. Phanedra Oneal, PSYCH NPPsychiatric/Mental Health Nurse Practitioner1144918491
  33. Nicole Onolfi, LMSWSocial Worker1942898648
  34. Jessica OnonakuBehavior Technician1851021414
  35. Grace Onuegbu, CRNPPsychiatric/Mental Health Nurse Practitioner1801363593
  36. Fidelis Onyimba, PHARM. DPharmacist1861794240
  37. Ruby Oommen Monichan, MDFamily Medicine Physician1952861353
  38. Uzoma Opaigbeogu, BA, MS, MDIV, DMINMental Health Counselor1235880899
  39. Sharon Opdyke, L/PTAPhysical Therapy Assistant1093961633
  40. Ernest Opoku-AgyemangRegistered Nurse1720543630
  41. Mylove OppongPharmacist1245787126
  42. Yvette Oquendo, M.D.Family Medicine Physician1225054091
  43. Hala OraibiBehavior Analyst1700764081
  44. James OrbanHearing Instrument Specialist1457796393
  45. Emellie OrdonezBehavior Technician1497636625
  46. Claudia OrellanaBehavior Technician1316521453
  47. Leslie Orellana-ABehavior Technician1972320299
  48. Philip Oreoluwa, MDPsychiatry Physician1184374480
  49. Adetoro OriaifoPharmacist1134429236
  50. Lisa OrlicRegistered Nurse1689213969

The largest Maryland cities

  1. Baltimore35,183
  2. Rockville14,353
  3. Bethesda7,245
  4. Silver Spring6,531
  5. Frederick3,981

All of Maryland →

How to read this directory

Columbia, Maryland appears in the CMS National Plan and Provider Enumeration System with 6,690 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 Columbia - 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 Columbia 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 Columbia is weighted toward Behavior Technician (2,034 clinicians, followed by Registered Nurse with 783 and Clinical Social Worker with 346). 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, Columbia reports roughly 108.2 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 Maryland's most common specialties, Home Health Aide is the most prominent one with no provider currently listing a Columbia practice address, a coverage gap Columbia patients typically fill by traveling to a larger nearby hub.

For Columbia 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 Columbia, MD?

There are 6,690 registered healthcare providers in Columbia, MD, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in Columbia?

The most common specialties in Columbia are Behavior Technician, Registered Nurse, Clinical Social Worker, Behavior Analyst, Physical Therapist. Behavior Technician has the most providers with 2,034.

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.