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 43 of 43.
The 8 largest groups in Waltham
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
- Crystal Zhang, MDCornea and External Diseases Specialist Physician1376047415
- Liyun ZhangSchool Social Worker1760357065
- Xiu Xia ZhangNurse Practitioner1992120059
- Yi Zhang, GNPGerontology Nurse Practitioner1083763908
- Zhenzhen ZhangAcupuncturist1417147117
- Shu ZhaoPharmacist1043681828
- Guangwei Zhou, SCD, CCC-AAudiologist1336203330
- Richard Zimmerman, RNRegistered Nurse1609029735
- Sarah Zimmerman, MDPediatrics Physician1295861961
- Kevin Zirko, DPTPhysical Therapist1336862234
- Maan Zuaitar, DDSDentist1780098079
The largest Massachusetts cities
- Boston41,865
- Worcester13,166
- Springfield8,553
- Cambridge5,145
- Brockton4,287
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.