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 89 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. Casey O'Neal, RMPMassage Therapist1235887258
  2. Ercilia O'Neal, BCBABehavior Analyst1962151282
  3. Teri O'Neil, FAMILY NURSE PRACTITFamily Nurse Practitioner1528241585
  4. Christine O'NeillRegistered Nurse1164832267
  5. Kathryn O'Reilly, CNMAdvanced Practice Midwife1548037112
  6. Esther Oak, DMDGeneral Practice Dentistry1891303830
  7. Kyley OakleyBehavior Technician1407524192
  8. Susan Oates, D.D.S.General Practice Dentistry1790917300
  9. La Shawna Obame, LGPC, NCCProfessional Counselor1437659562
  10. Muleta Obsu, M.D.Family Medicine Physician1033317375
  11. Suzan OchejaBehavior Technician1851250179
  12. Colbie OdenFamily Nurse Practitioner1790358208
  13. Adeyinka Odunowo, PHARMDPharmacist1477170124
  14. Laurie OetzelRegistered Nurse1639542434
  15. Skyler OfferBehavior Technician1003488859
  16. Collin OfficerBehavior Technician1114712288
  17. Favour OfoegbuPsychiatric/Mental Health Nurse Practitioner1891036604
  18. Felicia Ofori-MintahBehavior Analyst1174105795
  19. Joan Ogaitis, MS, OTR/LOccupational Therapist1619445350
  20. Deidra OgbuanyaRegistered Nurse1407524457
  21. Karen OggRegistered Nurse1205225869
  22. Abiola Ogiemwonyi, LMSWSocial Worker1063395978
  23. Omojolade Ogundiya, CNMMidwife1518641521
  24. Olafunsho OgunmuyiwaNurse's Aide1235087297
  25. Iziegbe OgunsanyaOccupational Therapist1124593280
  26. Rotimi OgunsholaBehavior Technician1932092996
  27. Jessica OgunyePsychiatric/Mental Health Nurse Practitioner1366201568
  28. Allysha OhBehavior Technician1356135024
  29. Changwon OhAcupuncturist1013643337
  30. Hyunsuk Oh, D.C.Chiropractor1386944163
  31. Emily Ohland, PA-CPhysician Assistant1336570456
  32. Stephanie Ojeda-Uruburo, PSYDPsychologist1992995518
  33. Chiedozie Ojimba, MDPsychiatry Physician1689198350
  34. Lovelyn OjimbaPsychiatric/Mental Health Nurse Practitioner1669399424
  35. Comfort OjoBehavior Technician1629627583
  36. Fadunwa OjoBehavior Technician1538963665
  37. Chetanna Okasi, MDObstetrics & Gynecology Physician1356484083
  38. Monisola OkeRegistered Nurse1700262920
  39. Shondra Okeefe, RNRegistered Nurse1710363932
  40. Olufunke Okegbenro, RN, CRNPPsychiatric/Mental Health Nurse Practitioner1174881411
  41. Chukwunonso OkekeRegistered Nurse1659702587
  42. Linda Okeke-Ojiudu, MDAnesthesiology Physician1578095865
  43. Christine OkemkpaBehavior Technician1316578123
  44. Harry Oken, MDInternal Medicine Physician1679566160
  45. Olpha OkeroFamily Nurse Practitioner1386479202
  46. Oliver Okinyih, MA., BCBABehavior Analyst1780342956
  47. Onosetale Okojie, MBBSHospitalist Physician1316689011
  48. Jesse Okonigbo, NPFamily Nurse Practitioner1013363670
  49. Isioma Okonkwo, RBTBehavior Technician1700497385
  50. Izegbuwa OkosunPharmacist1356950521

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.