NPPES file of Aug 9, 2026

Doctors and health care providers in Waterloo, IA

1,512 individual NPPES records list a practice address in Waterloo, 6th of 215 Iowa cities. The largest group is pharmacist: 115, 8% of the city's records, against 7% across Iowa. Page 11 of 31.

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

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Waterloo in Iowa

  • Rank in Iowa6th of 215 cities by records
  • Share of the state3.2% of Iowa's records
  • Specialties present25 or more taxonomy codes
  • Top three groups20.1% of all records
  • Pharmacist rank5th of the 10 Iowa cities with the most

Compared with Iowa as a whole, Waterloo has 16.8× the state's share of music therapist records and 0.45× its share of chiropractor records.

Providers in Waterloo, alphabetically

  1. Dillon Greer, HISHearing Instrument Specialist1477189686
  2. Samarah Greeves, LISWMental Health Counselor1316462682
  3. Mackenzie GriffinBehavior Technician1417766999
  4. Rickie Griffith, DOEmergency Medicine Physician1215315536
  5. Robert Grittmann, DOInternal Medicine Physician1689707291
  6. Melissa Groeneveld, ARNPFamily Nurse Practitioner1851671192
  7. Rhian Gronewold, ARNP-BCFamily Nurse Practitioner1912374141
  8. Daniel Grosser, LMSWClinical Social Worker1740524883
  9. Colleen Grote, LMHCMental Health Counselor1386013753
  10. Cindy Grow, ARNPAdult Health Nurse Practitioner1942686811
  11. Alyssa Grycko, PHARMDPharmacist1487258737
  12. Stephanie Grzybek, L.I.S.WClinical Social Worker1093086803
  13. Christine Guevara, PH.D.Psychologist1629262316
  14. Lauren GulanFamily Nurse Practitioner1326696717
  15. Jeffrey GuseFamily Nurse Practitioner1063827798
  16. Joanna Gustas, PHARMDAmbulatory Care Pharmacist1396200580
  17. Tracey Guthrie, CD(DONA)Doula1144590597
  18. Kaylie HackenmillerNurse Practitioner1851260418
  19. Sierra HackmanBehavior Technician1306700687
  20. Geoffrey Hadlock, MDFamily Medicine Physician1184668709
  21. Katherine Hadsall, DPMFoot & Ankle Surgery Podiatrist1619861309
  22. David Hagedorn, DOFamily Medicine Physician1922078369
  23. Nathan Hahn, MDAnesthesiology Physician1104806280
  24. Kari Haislet, ARNPNurse Practitioner1235182627
  25. Brady Hakeman, D.C.Chiropractor1013284488
  26. Emily Halbur, O.D.Optometrist1417113812
  27. Jennifer Hall, PA-CPhysician Assistant1447364823
  28. Carol Halloran, DDSDentist1407831746
  29. Mohamad Hamdi, MDObstetrics & Gynecology Physician1750570172
  30. John Hamiel, PHARM.D.Pharmacist1376962258
  31. Gabrielle HamptonBehavior Technician1205790581
  32. Allison Hancock, PTA, ATC, LATAthletic Trainer1598645574
  33. Kirre Hannan, PHARMDPharmacist1386278117
  34. Andrea Hansen, PAPhysician Assistant1578791570
  35. Danielle Hansen, LMSWSocial Worker1598204075
  36. Erin Hansen, DOCTOR OF PHARMACYPharmacist1750844411
  37. Robert Hansen, DDSGeneral Practice Dentistry1861578189
  38. Scott Hansen, DDSGeneral Practice Dentistry1558581553
  39. Tricia Hansen, RNPsychiatric/Mental Health Registered Nurse1568234706
  40. Teresa Hanson, DNP, PMHNPPsychiatric/Mental Health Nurse Practitioner1659108090
  41. Alexandra Harden, TLMHCMental Health Counselor1255015640
  42. James Harding, PH.DPsychologist1124108873
  43. Melissa Harding, MA, CADCAddiction (Substance Use Disorder) Counselor1699341297
  44. Nupur Harkness, PHARMDPharmacist Clinician (PhC)/ Clinical Pharmacy Specialist1497387989
  45. Madelynn Harman, MS, BCBABehavior Analyst1528462538
  46. Michael HarmanBehavior Analyst1467395970
  47. Margaret HarnStudent in an Organized Health Care Education/Training Program1073291407
  48. Sara Harnack, AUDAudiologist1285722041
  49. Raymond Harrington, PTPhysical Therapist1932152733
  50. Toni Harris, CRT/CHCHealth & Wellness Coach1841046109

The largest Iowa cities

  1. Iowa City7,163
  2. Des Moines5,538
  3. Cedar Rapids2,949
  4. West Des Moines2,201
  5. Davenport2,058

All of Iowa →

How to read this directory

Waterloo, Iowa appears in the CMS National Plan and Provider Enumeration System with 1,512 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 Waterloo - 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 Waterloo 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 Waterloo is weighted toward Pharmacist (115 clinicians, followed by Nurse Practitioner with 96 and Family Medicine Physician with 93). 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 Iowa's population, Waterloo reports roughly 47.1 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 Iowa's most common specialties, Occupational Therapist is the most prominent one with no provider currently listing a Waterloo practice address, a coverage gap Waterloo patients typically fill by traveling to a larger nearby hub.

For Waterloo 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 Waterloo, IA?

There are 1,512 registered healthcare providers in Waterloo, IA, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in Waterloo?

The most common specialties in Waterloo are Pharmacist, Nurse Practitioner, Family Medicine Physician, Clinical Social Worker, Mental Health Counselor. Pharmacist has the most providers with 115.

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.