NPPES file of Aug 9, 2026

Doctors and health care providers in Waltham, MA

2,111 individual NPPES records list a practice address in Waltham, 19th of 406 Massachusetts cities. The largest group is clinical social worker: 234, 11% of the city's records, against 8% across Massachusetts. Page 34 of 43.

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).

The 8 largest groups in Waltham

  1. Clinical Social Worker234
  2. Physical Therapist173
  3. Behavior Technician166
  4. Mental Health Counselor147
  5. Speech-Language Pathologist120
  6. Social Worker82
  7. Pharmacist78
  8. Occupational Therapist70

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

Waltham in Massachusetts

  • Rank in Massachusetts19th of 406 cities by records
  • Share of the state1% of Massachusetts's records
  • Specialties present25 or more taxonomy codes
  • Top three groups27.1% of all records

Compared with Massachusetts as a whole, Waltham has 9.1× the state's share of gerontology nurse practitioner records and 0.32× its share of student in an organized health care education/training program records.

Providers in Waltham, alphabetically

  1. Katrina Rudd, LICSWClinical Social Worker1073090973
  2. Elaine Rudel, MS, SLP-CCCSpeech-Language Pathologist1619045580
  3. Franziska RudorfClinical Social Worker1346643186
  4. Maxwell RuelMental Health Counselor1336853282
  5. Odell RuffinBehavior Technician1598314395
  6. Kristine Ruggiero, PNP, PHDPediatric Nurse Practitioner1437520855
  7. Jennifer Ruhl, MSWClinical Social Worker1871658187
  8. Isaac Rurengo, LPNLicensed Practical Nurse1417719048
  9. Susanne Russell, OTErgonomics Occupational Therapist1417921826
  10. Kevin Russo, BCBA, LABABehavior Analyst1740899665
  11. Michael RyanCounselor1043097090
  12. Robert Sabatino, PT, DPTPhysical Therapist1386240851
  13. Riwa SabbaghReproductive Endocrinology Physician1831621085
  14. Deborah Sabin, OTOccupational Therapist1902439714
  15. Mary Sabolsi, MD, MPHInfectious Disease Physician1386679439
  16. Cynthia Sacco, M.D.Pediatrics Physician1164576237
  17. Linda Sacks, LICSWClinical Social Worker1497081707
  18. Hannah SacraMental Health Counselor1770340010
  19. Negaar Sagafi, D.M.D.Orthodontics and Dentofacial Orthopedics Dentistry1942349360
  20. Shahin Sagafi, DMDPediatric Dentistry1508937673
  21. Patricia Sagrero AlonzoCounselor1053199810
  22. Jill Sahai, MSWBehavior Analyst1144606617
  23. Yehudah SahlerBehavior Technician1215593918
  24. Nicole SalamySpeech-Language Pathologist1548711922
  25. Elizabeth SaldanaBehavior Technician1720566326
  26. Muhammad SaleemPharmacist1356817779
  27. Kathryn SalemmeOccupational Therapist1619541075
  28. Regina SallBehavior Analyst1548587561
  29. Rami Salloum, DMDDentist1851998827
  30. Carolyn SalviClinical Social Worker1932020963
  31. Rosaria Salvucci, RNRegistered Nurse1326763939
  32. Christopher Salzillo, DMDGeneral Practice Dentistry1588040737
  33. Lisa Samios, MS, SLP-CCCSpeech-Language Pathologist1811065246
  34. Kathleen Samp, MSW, LICSWClinical Social Worker1588957286
  35. Tatianna SamuelBehavior Technician1245893221
  36. Patricia SanchezBehavior Technician1285272930
  37. Zayda SanchezMental Health Counselor1861073926
  38. Nicholas Sang, DPTPhysical Therapist1427458488
  39. Lorraine SanikDevelopmental Therapist1518135219
  40. Claudia Santander VinardellGeneral Practice Dentistry1801596531
  41. Valeria SantangeloSocial Worker1881465375
  42. Sarah SantoroClinical Social Worker1356590541
  43. Palmira SantosDevelopmental Therapist1538648597
  44. Katherine SaphireOccupational Therapist1235698804
  45. Ava SarafanClinical Social Worker1720582489
  46. Leo Sarkissian, MSWSocial Worker1639644651
  47. Priya SashtiMental Health Counselor1932987450
  48. Linda Satkowski, NPGerontology Nurse Practitioner1043360837
  49. Charles Sauerwald, LADC IAddiction (Substance Use Disorder) Counselor1376350504
  50. Amy SaundersMental Health Counselor1912359985

The largest Massachusetts cities

  1. Boston41,865
  2. Worcester13,166
  3. Springfield8,553
  4. Cambridge5,145
  5. Brockton4,287

All of Massachusetts →

How to read this directory

Waltham, Massachusetts appears in the CMS National Plan and Provider Enumeration System with 2,111 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 Waltham - 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 Waltham 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 Waltham is weighted toward Clinical Social Worker (234 clinicians, followed by Physical Therapist with 173 and Behavior Technician with 166). 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 Massachusetts's population, Waltham reports roughly 30.2 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.

For Waltham 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 Waltham, MA?

There are 2,111 registered healthcare providers in Waltham, MA, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in Waltham?

The most common specialties in Waltham are Clinical Social Worker, Physical Therapist, Behavior Technician, Mental Health Counselor, Speech-Language Pathologist. Clinical Social Worker has the most providers with 234.

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.