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 208 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. Brett OrtizBehavior Technician1811590672
  2. Shelby Ortiz, PHDHealth Psychologist1639994445
  3. Jill Ortmann, RNRegistered Nurse1437423894
  4. Paul Ortquist, PA-CPhysician Assistant1013926310
  5. Elizaveta Orysheva, MDStudent in an Organized Health Care Education/Training Program1457036303
  6. Megan Orzech, PA-CPhysician Assistant1790555126
  7. Rebecca Osaigbovo, RNRegistered Nurse1558768507
  8. Grace Osborne, MDPediatric Dermatology Physician1043714744
  9. Jenae Osborne, MS, CGCGenetic Counselor (M.S.)1497904825
  10. Nicholas Osborne, M.D.Vascular Surgery Physician1770602922
  11. Abena Osei, MDObstetrics & Gynecology Physician1205762523
  12. Robert Osenkowski, CRNACertified Registered Nurse Anesthetist1871080689
  13. Alexander Oserowsky, MDDiagnostic Radiology Physician1760066609
  14. Katie Osgood, LPCMental Health Counselor1720977879
  15. Lily OsgoodBehavior Technician1558079509
  16. Maissa Osman, LLPCMental Health Counselor1932539392
  17. Oluseyi OsobamiroBehavior Technician1982588117
  18. Gisselle Osorio VazquezNurse's Aide1558152454
  19. Elisa Ostafin, MDInternal Medicine Physician1770672917
  20. John Osterholzer, MDPulmonary Disease Physician1669588083
  21. Rebecca Osterhout, PHDPsychologist1417281072
  22. Michael Osterman, PA-C, ATCPhysician Assistant1225429996
  23. Breann Ostlund, DPTPhysical Therapist1598315079
  24. Shelby Ostrewich, LLMSWClinical Social Worker1871482406
  25. Natalie Ostrom, RNRegistered Nurse1932834314
  26. Waseem Ostwani, MDPediatric Critical Care Medicine Physician1265646335
  27. Jennifer Otersen, CRNACertified Registered Nurse Anesthetist1437199478
  28. Amal Othman, MDFamily Medicine Physician1457510349
  29. Amna Othman, MB BCHClinical Genetics (M.D.) Physician1881321768
  30. Faith Otieno, LBSWSocial Worker1730586199
  31. Amanda OtisPhysical Therapist1578065421
  32. Mackenzie Ott, LLMSWClinical Social Worker1811430895
  33. Sarah Otte, ATCAthletic Trainer1366832768
  34. Rebecca Otten, M.D.Emergency Medicine Physician1013355353
  35. Lauren Ottenhoff, DONeurology Physician1831584499
  36. Alana Otto, M.D.Pediatric Adolescent Medicine Physician1588927974
  37. Megan OttoRegistered Nurse1861318016
  38. Mira Otto, M.D.Internal Medicine Physician1851719553
  39. Erika OuchiStudent in an Organized Health Care Education/Training Program1184463341
  40. Rebecca Oudsema, MDDiagnostic Radiology Physician1437563756
  41. Lindsay Overall, NPNurse Practitioner1861092900
  42. Ryan Overby, MDDiagnostic Radiology Physician1881125516
  43. Christina Overgaard, PTAPhysical Therapy Assistant1114566346
  44. Richard Overman, M.D.Surgery Physician1780004069
  45. Marilyn Overmyer, MSWSocial Worker1427192954
  46. Rieham Owda, MDComplex Family Planning Physician1629503537
  47. Christopher OwenClinical Child & Adolescent Psychologist1235852468
  48. Debra OwenPsychologist1720463912
  49. Susan Owen, MA, RNRegistered Nurse1124150503
  50. David Owen-Cruise, LLPClinical Psychologist1396497210

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.