NPPES file of Aug 9, 2026

Doctors and health care providers in Ann Arbor, MI

15,616 individual NPPES records list a practice address in Ann Arbor, 4th of 515 Michigan cities. The largest group is clinical social worker: 1,236, 8% of the city's records, against 6% across Michigan. Page 205 of 313.

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

The 8 largest groups in Ann Arbor

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

Ann Arbor in Michigan

  • Rank in Michigan4th of 515 cities by records
  • Share of the state5.5% of Michigan's records
  • Specialties present25 or more taxonomy codes
  • Top three groups22.1% of all records
  • Clinical Social Worker rank3rd of the 10 Michigan cities with the most

Compared with Michigan as a whole, Ann Arbor has 4.2× the state's share of anesthesiology physician records and 0.29× its share of behavior technician records.

Providers in Ann Arbor, alphabetically

  1. Florence O'Gara, LMSW, RNClinical Social Worker1548455272
  2. Levon O'Haodha, MDEmergency Medicine Physician1700905213
  3. Patrick O'HayerStudent in an Organized Health Care Education/Training Program1659932564
  4. Emily O'KeefePharmacist1104718618
  5. Sean O'Keefe, M.D.Internal Medicine Physician1811526759
  6. Heather O'Mahen Willis, PHDMental Health Counselor1063520708
  7. Mackenzie O'MalleyBehavior Technician1972177145
  8. Andrea O'Neil, LMSWClinical Social Worker1649315250
  9. Tara O'NeilCase Manager/Care Coordinator1386421014
  10. Casey O'Neill, LLMSWSocial Worker1508539701
  11. Dana O'Neill, D.O.Family Medicine Physician1023305216
  12. Jennifer O'NeillObstetrics & Gynecology Physician1437545431
  13. Jessica O'Neill, PHARM.D.Pharmacist1215033733
  14. Morgan O'Neill, DOStudent in an Organized Health Care Education/Training Program1669213948
  15. Kevin O'Reilly, DOInternal Medicine Physician1952693079
  16. Michael O'Reilly, MDAnesthesiology Physician1760400253
  17. Elisa O'Riordan, MA, RDRegistered Dietitian1821936808
  18. Alyssa O'Rourke, NPFamily Nurse Practitioner1730826801
  19. Lindsay O'Rourke, LLPCProfessional Counselor1639864382
  20. Robert O'Rourke, MDSurgery Physician1346256955
  21. Riley O'RyanPhysical Therapy Assistant1265884563
  22. Jessica O'Shea, CGCGenetic Counselor (M.S.)1811474042
  23. Kelly O'Shea, MDAllergy & Immunology Physician1427445022
  24. Timothy O'Shea, DMDDentist1558713842
  25. Daniel O'TooleGeneral Practice Dentistry1013005776
  26. Daniel O'Toole, OTRLOccupational Therapist1326608167
  27. Alice OakesBehavior Technician1275203317
  28. Emery OakesBehavior Technician1235002858
  29. Faye Oakes, MDAnatomic Pathology & Clinical Pathology Physician1396488730
  30. Nosazena ObasekiPsychologist1346043445
  31. Joy ObayemiGeneral Practice Physician1457974834
  32. Kelly Oberhelman, PAPhysician Assistant1003967811
  33. Andrea Obi, MDVascular Surgery Physician1851554570
  34. Ekenedirichukwu ObiPharmacist1336970359
  35. Susan OblenderGerontology Occupational Therapist1508374398
  36. Colleen Obrien, RNRegistered Nurse1972634574
  37. Tulicaa OchaniBehavior Technician1891653507
  38. Hanna OchsBehavior Technician1790353399
  39. James Oconnor, D.O.Adult Medicine Physician1659442184
  40. Lauren OconnorOccupational Therapist1194212803
  41. Jashan Octain, M.D.Internal Medicine Physician1356636997
  42. Mary Odalovich, NPNurse Practitioner1285821751
  43. David Odell, MDThoracic Surgery (Cardiothoracic Vascular Surgery) Physician1033354592
  44. Kenechukwu OdenigboStudent in an Organized Health Care Education/Training Program1245024488
  45. Folafoluwa Odetola, MB, CHBPediatric Critical Care Medicine Physician1376557397
  46. Dominic Oehler, BSN, RNCommunity Health Registered Nurse1104516137
  47. Steve Oestreich, ATCAthletic Trainer1992734438
  48. Samantha Oetting, LMTMassage Therapist1780253682
  49. Henry Oexmann, MDChild & Adolescent Psychiatry Physician1720615180
  50. Linda Offerle, R.D.Registered Dietitian1356442545

The largest Michigan cities

  1. Farmington Hills36,305
  2. Detroit19,832
  3. Grand Rapids18,005
  4. Novi7,641
  5. Kalamazoo6,553

All of Michigan →

How to read this directory

Ann Arbor, Michigan appears in the CMS National Plan and Provider Enumeration System with 15,616 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 Ann Arbor - 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 Ann Arbor 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 Ann Arbor is weighted toward Clinical Social Worker (1,236 clinicians, followed by Student in an Organized Health Care Education/Training Program with 1,217 and Behavior Technician with 1,000). 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 Michigan's population, Ann Arbor reports roughly 155.6 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 Michigan's most common specialties, Family Nurse Practitioner is the most prominent one with no provider currently listing a Ann Arbor practice address, a coverage gap Ann Arbor patients typically fill by traveling to a larger nearby hub.

For Ann Arbor 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 Ann Arbor, MI?

There are 15,616 registered healthcare providers in Ann Arbor, MI, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in Ann Arbor?

The most common specialties in Ann Arbor are Clinical Social Worker, Student in an Organized Health Care Education/Training Program, Behavior Technician, Nurse Practitioner, Physician Assistant. Clinical Social Worker has the most providers with 1,236.

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.