Doctors and health care providers in Frederick, MD
3,981 individual NPPES records list a practice address in Frederick, 6th of 284 Maryland cities. The largest group is behavior technician: 427, 11% of the city's records, against 16% across Maryland. Page 53 of 80.
The 8 largest groups in Frederick
Source: CMS NPPES primary taxonomy, file of Aug 9, 2026.
Frederick in Maryland
- Rank in Maryland6th of 284 cities by records
- Share of the state2.5% of Maryland's records
- Specialties present25 or more taxonomy codes
- Top three groups25.7% of all records
Compared with Maryland as a whole, Frederick has 2.3× the state's share of massage therapist records and 0.60× its share of internal medicine physician records.
Providers in Frederick, alphabetically
- Olivia Oates, LGPCProfessional Counselor1316696594
- Frank Oben NguembouAcute Care Nurse Practitioner1881275378
- Mary Obenland, OTR/LOccupational Therapist1982177994
- James Oberman, M.D.Otolaryngology Physician1780664979
- Margaret Oberman, M.D.Internal Medicine Physician1972583581
- Francisca ObodoPsychiatric/Mental Health Nurse Practitioner1174270995
- Diane Ochalek, LCSW-CClinical Social Worker1144797762
- Beatrice Ochieng, MS, LCPCProfessional Counselor1285938373
- Rachel Oddoye, LMSWMental Health Counselor1730927666
- Elizabeth Odom, LCSW-CClinical Social Worker1386368991
- Jacinta OduroFamily Nurse Practitioner1891422002
- Noah OffenbacherSocial Worker1881526184
- Sherees OforiBehavior Technician1073252789
- Claudia Ofori-Marfoh, MDUrology Physician1083172134
- Alexis OgrenProfessional Counselor1669179214
- Happiness OguaririFamily Nurse Practitioner1386264083
- Raphael OguaririFamily Nurse Practitioner1588328835
- Yun Oh, M.D.Hematology & Oncology Physician1194898791
- Chigozie Ohanele, NP-CPrimary Care Nurse Practitioner1568710440
- John Ohsann, PA-CPhysician Assistant1508379199
- Ojedapo Ojeyemi, M.DOrthopaedic Surgery of the Spine Physician1437317005
- Audrey OkechMassage Therapist1174348619
- Daniel Okine, BTBehavior Technician1861095457
- Sandra OkobiBehavior Technician1164285607
- Maryann Okolie DioneCase Manager/Care Coordinator1255192860
- Oyebola Oladeinde, PHARM. D.Pharmacist1376935841
- Fabio Olarte, M.D.Neonatal-Perinatal Medicine Physician1932119344
- Marykay Olive, PTPhysical Therapist1730305244
- Sarah Oliveira, NPFamily Nurse Practitioner1184235681
- Sheldon OliverContractor1316648066
- Alaina Olsen, MSMental Health Counselor1922827310
- Claudia OlsonAcupuncturist1316463284
- Morgan OlsonBehavior Technician1144890294
- Nils Olson, D.D.S.General Practice Dentistry1497889075
- Ashley Olszewski, CRNPObstetrics & Gynecology Nurse Practitioner1396462859
- Ihsan Omar, LCSW-C, CSTClinical Social Worker1427364108
- Nkechi OnaziRegistered Nurse1275936411
- Sarah Onderko, DPTPhysical Therapist1255908521
- Melanie Ondrejko, CRNPAcute Care Nurse Practitioner1992265656
- Jennifer Ononiba, PMHNPPsychiatric/Mental Health Nurse Practitioner1548062383
- Joshua Oppenheimer, M.D.Emergency Medicine Physician1861841447
- Kayla OrcuttProfessional Counselor1235851585
- Heather Orndorff, CRNPCritical Care Neonatal Nurse Practitioner1225374804
- Julio OrozcoProfessional Counselor1144778572
- Jaeda OrrBehavior Technician1194619585
- Lisa OrtizChiropractor1366471740
- Melissa Ortiz, OTROccupational Therapist1609035419
- Daegan OsbornePharmacist1730763350
- David OsbornePharmacist1174276729
- Margaret Oshai, RNDiabetes Educator Registered Nurse1124454699
The largest Maryland cities
- Baltimore35,183
- Rockville14,353
- Bethesda7,245
- Columbia6,690
- Silver Spring6,531
How to read this directory
Frederick, Maryland appears in the CMS National Plan and Provider Enumeration System with 3,981 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 Frederick - 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 Frederick 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 Frederick is weighted toward Behavior Technician (427 clinicians, followed by Clinical Social Worker with 348 and Physical Therapist with 249). 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, Frederick reports roughly 64.4 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 Frederick practice address, a coverage gap Frederick patients typically fill by traveling to a larger nearby hub.
For Frederick 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 Frederick, MD?
There are 3,981 registered healthcare providers in Frederick, MD, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.
What are the most common medical specialties in Frederick?
The most common specialties in Frederick are Behavior Technician, Clinical Social Worker, Physical Therapist, Professional Counselor, Mental Health Counselor. Behavior Technician has the most providers with 427.
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.