NPPES file of Aug 9, 2026

Doctors and health care providers in Baltimore, MD

35,183 individual NPPES records list a practice address in Baltimore, 1st of 284 Maryland cities. The largest group is students in training: 4,028, 11% of the city's records, against 4% across Maryland. Page 465 of 704.

CMS NPPES registry, file of Aug 9, 2026 · method · Verify with CMS →

The 8 largest groups in Baltimore

Source: CMS NPPES primary taxonomy, file of Aug 9, 2026.

Baltimore in Maryland

  • Rank in Maryland1st of 284 cities by records
  • Share of the state22.1% of Maryland's records
  • Specialties present25 or more taxonomy codes
  • Top three groups27.1% of all records
  • Students in training rank1st of the 10 Maryland cities with the most

Compared with Maryland as a whole, Baltimore has 3.2× the state's share of student in an organized health care education/training program records and 0.64× its share of professional counselor records.

Providers in Baltimore, alphabetically

  1. Isalena O'Donnell, M.AC. L.AC.Acupuncturist1528343084
  2. Lori O'DonnellHealth Educator1669168795
  3. Martin O'Donnell, M.B., B.CH., B.A.O.Student in an Organized Health Care Education/Training Program1336935113
  4. Meagan O'Donnell, CCC-SLPSpeech-Language Pathologist1548576911
  5. Nicole O'DonnellOccupational Therapist1124668017
  6. Nolan O'Dowd, MDPublic Health & General Preventive Medicine Physician1306342324
  7. Breeze O'Farrell, LMSWSocial Worker1467268896
  8. Claire O'Grady, MDInternal Medicine Physician1730717687
  9. Naomi O'Grady, M.D.Infectious Disease Physician1255378261
  10. Joseph O'HalloranAddiction (Substance Use Disorder) Counselor1881440469
  11. Gina O'HaraMedical Physician Assistant1487043964
  12. Kay O'Hara, D.C.Chiropractor1780760371
  13. Sally O'Hara, LCPCProfessional Counselor1649391723
  14. Anna O'Hare, OTAOccupational Therapy Assistant1720424252
  15. Elena O'Hatnick, MA, LCPCMental Health Counselor1518250273
  16. Helene O'Keefe, C.N.M.Advanced Practice Midwife1356453658
  17. Mary O'Keefe, LCSW-CClinical Social Worker1972942589
  18. Chelsae O'Keiff, PTAPhysical Therapy Assistant1083039028
  19. Brynn O'Laughlin, MDPediatric Gastroenterology Physician1255868352
  20. Allison O'Leary, OTR/LOccupational Therapist1053784470
  21. Janet O'Mahony, M.D.Internal Medicine Physician1538107073
  22. Katherine O'Mahony McEvoy, MB BCHPsychiatry Physician1215296785
  23. Katee O'Malley, DOStudent in an Organized Health Care Education/Training Program1588293419
  24. Kevin O'Malley, M.D.Internal Medicine Physician1043673213
  25. Michael O'Malley, MDAnatomic Pathology & Clinical Pathology Physician1013051499
  26. Sara O'Malley, PHDClinical Psychologist1710262829
  27. Deirdre O'Mara, CCC-SLPSpeech-Language Pathologist1740875681
  28. Rebecca O'Mara, M.S., CCC-SLPSpeech-Language Pathologist1619159225
  29. Lindsay O'Meara, CRNPAcute Care Nurse Practitioner1003107525
  30. Brittney O'Neal, LMSWSocial Worker1669297909
  31. Cashmere O'Neal, LCSW-C, LICSWClinical Social Worker1770950883
  32. Darrin O'NealCase Manager/Care Coordinator1063940393
  33. Jerrica O'Neal, CRNACertified Registered Nurse Anesthetist1114597150
  34. Madelyn O'Neal, DNP, FNP-CFamily Nurse Practitioner1376021832
  35. Boise O'NeilBehavior Technician1649876590
  36. David O'Neil, MDGynecology Physician1154364529
  37. Brittany O'NeillSpeech/Language/Hearing Specialist/Technologist1851863971
  38. Cierra O'Neill, PA-CMedical Physician Assistant1679257364
  39. Jill O'NeillClinical Social Worker1093252249
  40. Joseph O'Neill, M.D.Internal Medicine Physician1528495629
  41. Sharon O'Neill, C.R.N.P.Nurse Practitioner1861439044
  42. Geralyn O'Reilly, M.D.Maternal & Fetal Medicine Physician1548348485
  43. James O'Rourke, MDAnesthesiology Physician1912982430
  44. Kimberly O'Rourke, M.D.Obstetrics & Gynecology Physician1093929366
  45. Paul O'Rourke, MD, MPHInternal Medicine Physician1811280779
  46. Emma O'Shea, DDSStudent in an Organized Health Care Education/Training Program1023949914
  47. Gretchen O'Shea, LCSW-CSocial Worker1316230832
  48. Lucy O'SullivanStudent in an Organized Health Care Education/Training Program1992459010
  49. Jacqueline O'Toole, D.O.Pulmonary Disease Physician1902148471
  50. Kimberly O'ToolePhysical Therapy Assistant1386069391

The largest Maryland cities

  1. Rockville14,353
  2. Bethesda7,245
  3. Columbia6,690
  4. Silver Spring6,531
  5. Frederick3,981

All of Maryland →

How to read this directory

Baltimore, Maryland appears in the CMS National Plan and Provider Enumeration System with 35,183 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 Baltimore - 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 Baltimore 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 Baltimore is weighted toward Student in an Organized Health Care Education/Training Program (4,028 clinicians, followed by Behavior Technician with 3,602 and Clinical Social Worker with 1,917). 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, Baltimore reports roughly 569.3 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.

Of Maryland's most common specialties, Home Health Aide is the most prominent one with no provider currently listing a Baltimore practice address, a coverage gap Baltimore patients typically fill by traveling to a larger nearby hub.

For Baltimore 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 Baltimore, MD?

There are 35,183 registered healthcare providers in Baltimore, MD, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in Baltimore?

The most common specialties in Baltimore are Student in an Organized Health Care Education/Training Program, Behavior Technician, Clinical Social Worker, Internal Medicine Physician, Physician Assistant. Student in an Organized Health Care Education/Training Program has the most providers with 4,028.

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.