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 91 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
- Amy Ornelas, RN, BSNRegistered Nurse1316145915
- Bailey Oros, LCSW-CClinical Social Worker1770344814
- Rebecca OrossBehavior Analyst1235022237
- Jennifer Ortiz, MPTPhysical Therapist1568527265
- Robin Ortiz, BCBABehavior Analyst1013423821
- Guillermo Ortiz MachucaPhysical Therapist1346909561
- Janine OsborneRegistered Nurse1568873362
- Sonya Osborne, LGPC, NCCProfessional Counselor1760074637
- Stacie Osburne, RNRegistered Nurse1730750621
- Aubrey OseiBehavior Technician1558807461
- Mhina OseitutuBehavior Technician1134046907
- Abidemi OseniPharmacist1629724240
- Ronald OsheaBehavior Technician1821931759
- Joseph Osheroff, M.D.Specialist1871588707
- Rob Oshinsky, M.DNeurology Physician1265643373
- Oluwayemi OsilajaBehavior Technician1093647174
- Ekaterina Osipova, RNRegistered Nurse1932627304
- Zeena OsmanBehavior Technician1912882838
- Muyinat OsobaOtolaryngology Physician1982100525
- Yu-Ching Ostendorp, LCPCProfessional Counselor1861667875
- Patricia Oswald, CRNPAdult Health Nurse Practitioner1467440859
- Peace OtigbaFamily Nurse Practitioner1730650243
- Lydia OtooPsychiatric/Mental Health Nurse Practitioner1710504899
- Jennifer Otremba-Gorski, MPTOrthopedic Physical Therapist1831205830
- Heather Ott, PT, DPTPhysical Therapist1174953079
- Lisa Ott, M.S.W.Clinical Social Worker1336509033
- Robert Ott, PH.D., L.C.P.C.Professional Counselor1619092939
- Matthew Otto, L.C.P.C.Professional Counselor1598035701
- Katina OurslerBehavior Technician1558024091
- Ana OutlandBehavior Technician1578436812
- Ofek Ovadia, DNP, PMHNP-BC, CRNP-Psychiatric/Mental Health Nurse Practitioner1154245785
- Linda Ovrick, LCSW-CClinical Social Worker1265987200
- Alethea OwanBehavior Technician1861094450
- Ananda OwensBehavior Technician1164233854
- Bonnie OwensBehavior Technician1811678568
- Emily OwensBehavior Technician1326998675
- Lynn Owens, PSYDClinical Psychologist1154618494
- Nikia OwensBehavior Technician1780497016
- Bright OwoaheneBehavior Technician1710739065
- Jane OwohBehavior Technician1083556005
- Folasade Owolabi, LMSWSocial Worker1497409361
- Ruth Owusu-Boahene, DDSDentist1205242187
- Cynthia Owusu-Boaitey, PHARMDPharmacist1427422203
- Yaw Owusu-Poku, PA-CPhysician Assistant1487066726
- Israel OyelakinRegistered Nurse1194182402
- Toluwabori OyetiBehavior Technician1922839406
- Tracy Oyugi, MDAnesthesiology Physician1528706751
- Kailyn OzunaBehavior Technician1619687019
- Tatiana PabonBehavior Analyst1013518570
- Mary Pabst, RDRegistered Dietitian1508677857
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.