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.
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
- Casey O'Neal, RMPMassage Therapist1235887258
- Ercilia O'Neal, BCBABehavior Analyst1962151282
- Teri O'Neil, FAMILY NURSE PRACTITFamily Nurse Practitioner1528241585
- Christine O'NeillRegistered Nurse1164832267
- Kathryn O'Reilly, CNMAdvanced Practice Midwife1548037112
- Esther Oak, DMDGeneral Practice Dentistry1891303830
- Kyley OakleyBehavior Technician1407524192
- Susan Oates, D.D.S.General Practice Dentistry1790917300
- La Shawna Obame, LGPC, NCCProfessional Counselor1437659562
- Muleta Obsu, M.D.Family Medicine Physician1033317375
- Suzan OchejaBehavior Technician1851250179
- Colbie OdenFamily Nurse Practitioner1790358208
- Adeyinka Odunowo, PHARMDPharmacist1477170124
- Laurie OetzelRegistered Nurse1639542434
- Skyler OfferBehavior Technician1003488859
- Collin OfficerBehavior Technician1114712288
- Favour OfoegbuPsychiatric/Mental Health Nurse Practitioner1891036604
- Felicia Ofori-MintahBehavior Analyst1174105795
- Joan Ogaitis, MS, OTR/LOccupational Therapist1619445350
- Deidra OgbuanyaRegistered Nurse1407524457
- Karen OggRegistered Nurse1205225869
- Abiola Ogiemwonyi, LMSWSocial Worker1063395978
- Omojolade Ogundiya, CNMMidwife1518641521
- Olafunsho OgunmuyiwaNurse's Aide1235087297
- Iziegbe OgunsanyaOccupational Therapist1124593280
- Rotimi OgunsholaBehavior Technician1932092996
- Jessica OgunyePsychiatric/Mental Health Nurse Practitioner1366201568
- Allysha OhBehavior Technician1356135024
- Changwon OhAcupuncturist1013643337
- Hyunsuk Oh, D.C.Chiropractor1386944163
- Emily Ohland, PA-CPhysician Assistant1336570456
- Stephanie Ojeda-Uruburo, PSYDPsychologist1992995518
- Chiedozie Ojimba, MDPsychiatry Physician1689198350
- Lovelyn OjimbaPsychiatric/Mental Health Nurse Practitioner1669399424
- Comfort OjoBehavior Technician1629627583
- Fadunwa OjoBehavior Technician1538963665
- Chetanna Okasi, MDObstetrics & Gynecology Physician1356484083
- Monisola OkeRegistered Nurse1700262920
- Shondra Okeefe, RNRegistered Nurse1710363932
- Olufunke Okegbenro, RN, CRNPPsychiatric/Mental Health Nurse Practitioner1174881411
- Chukwunonso OkekeRegistered Nurse1659702587
- Linda Okeke-Ojiudu, MDAnesthesiology Physician1578095865
- Christine OkemkpaBehavior Technician1316578123
- Harry Oken, MDInternal Medicine Physician1679566160
- Olpha OkeroFamily Nurse Practitioner1386479202
- Oliver Okinyih, MA., BCBABehavior Analyst1780342956
- Onosetale Okojie, MBBSHospitalist Physician1316689011
- Jesse Okonigbo, NPFamily Nurse Practitioner1013363670
- Isioma Okonkwo, RBTBehavior Technician1700497385
- Izegbuwa OkosunPharmacist1356950521
The largest Maryland cities
- Baltimore35,183
- Rockville14,353
- Bethesda7,245
- Silver Spring6,531
- Frederick3,981
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.