Doctors in Frederick, MD
Active healthcare providers in Frederick sourced from the CMS NPPES weekly file, no proprietary ratings, no editorial scores. NPI counts, specialty distribution, and primary practice addresses refreshed each release.
3,850 healthcare providers across 20 specialties
Frederick, Maryland appears in the CMS National Plan and Provider Enumeration System with 3,850 registered healthcare providers spanning 20 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 2023 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 (368 clinicians, followed by Clinical Social Worker with 319 and Physical Therapist with 238). 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 62.3 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.
Within Maryland, Frederick ranks #6 of 280 cities tracked by provider count, accounting for 2.5% of the state's registered providers. Of Maryland's most common specialties, Student in an Organized Health Care Education/Training Program 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, searching by specialty narrows the 690-taxonomy roster to clinicians with the relevant training, and each provider page links to NPI, state licensing boards, and the NPPES registry for credential verification. 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, so listing details may be out of date; call the practice directly to confirm the provider is still there, accepts your insurance, and is taking new patients. Nothing on this page substitutes for consulting a licensed clinician about your personal health decisions.
Which specialties are most common in Frederick
Healthcare Providers (Page 51)
| Name |
|---|
| Patricia O Brien, PT Physical Therapist |
| John O'Brien, LCSW-C Clinical Social Worker |
| Brian O'Connor, MD Hematology & Oncology Physician |
| Megan O'Connor Speech-Language Pathologist |
| Nancy O'Donnell, PT Physical Therapist |
| Celia O'Fallon Speech-Language Pathologist |
| Jane O'Keefe Behavior Technician |
| Kelli O'Neal, PA-C Physician Assistant |
| Teri O'Neil, MSN,FNP Family Nurse Practitioner |
| Avery O'Neill Behavior Technician |
| James O'Neill, LCPC Mental Health Counselor |
| Erin O'Toole, LCPC Professional Counselor |
| Catherine Oakley Physician Assistant |
| Olivia Oates, LGPC Professional Counselor |
| Frank Oben Nguembou Emergency Registered Nurse |
| Mary Obenland, OTR/L Occupational Therapist |
| James Oberman, M.D. Otolaryngology Physician |
| Margaret Oberman, M.D. Internal Medicine Physician |
| Amarachi Obi, MD Obstetrics & Gynecology Physician |
| Francisca Obodo Psychiatric/Mental Health Nurse Practitioner |
| Diane Ochalek, LCSW-C Clinical Social Worker |
| Beatrice Ochieng, MS, LCPC Professional Counselor |
| Rachel Oddoye, LMSW Mental Health Counselor |
| Elizabeth Odom, LCSW-C Clinical Social Worker |
| Jacinta Oduro Family Nurse Practitioner |
| Sherees Ofori Behavior Technician |
| Claudia Ofori-Marfoh, MD Urology Physician |
| Alexis Ogren Professional Counselor |
| Happiness Oguariri Family Nurse Practitioner |
| Raphael Oguariri Family Nurse Practitioner |
| Yun Oh, M.D. Hematology & Oncology Physician |
| Chigozie Ohanele, NP-C Primary Care Nurse Practitioner |
| John Ohsann, PA-C Physician Assistant |
| Ojedapo Ojeyemi, M.D Orthopaedic Surgery of the Spine Physician |
| Audrey Okech Massage Therapist |
| Daniel Okine, BT Behavior Technician |
| Sandra Okobi Behavior Technician |
| Maryann Okolie Dione Case Manager/Care Coordinator |
| Oyebola Oladeinde, PHARM. D. Pharmacist |
| Fabio Olarte, M.D. Neonatal-Perinatal Medicine Physician |
| Marykay Olive, PT Physical Therapist |
| Sarah Oliveira, NP Oncology Registered Nurse |
| Sheldon Oliver Contractor |
| Alaina Olsen, MS Mental Health Counselor |
| Claudia Olson Acupuncturist |
| Morgan Olson Behavior Technician |
| Nils Olson, D.D.S. General Practice Dentistry |
| Ashley Olszewski, CRNP Obstetrics & Gynecology Nurse Practitioner |
| Ihsan Omar, LCSW-C, CST Clinical Social Worker |
| Nkechi Onazi Registered Nurse |
Nearby Cities in Maryland
Other Maryland cities with provider coverage in the CMS NPPES registry.
Frequently Asked Questions
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Provider data from CMS NPPES (download.cms.gov/nppes); specialty classification from NUCC Health Care Provider Taxonomy. PlainDoctor does not rate or rank providers. Methodology · About
Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from CMS National Plan and Provider Enumeration System (NPPES). Consult a qualified professional before making decisions based on this data.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2026-05-20.