Doctors and health care providers in Boston, MA
41,865 individual NPPES records list a practice address in Boston, 1st of 406 Massachusetts cities. The largest group is students in training: 6,126, 15% of the city's records, against 5% across Massachusetts. Page 123 of 838.
The 8 largest groups in Boston
Source: CMS NPPES primary taxonomy, file of Aug 9, 2026.
Boston in Massachusetts
- Rank in Massachusetts1st of 406 cities by records
- Share of the state19.1% of Massachusetts's records
- Specialties present25 or more taxonomy codes
- Top three groups24.7% of all records
- Students in training rank1st of the 10 Massachusetts cities with the most
Compared with Massachusetts as a whole, Boston has 2.9× the state's share of student in an organized health care education/training program records and 0.23× its share of mental health counselor records.
Providers in Boston, alphabetically
- Cathleen CasilloCertified Registered Nurse Anesthetist1225656242
- Teresa CasimireMarriage & Family Therapist1760276240
- Rachel Caso, LICSWClinical Social Worker1922651199
- Kelly CasottanaStudent in an Organized Health Care Education/Training Program1891526000
- Jessica Casper, PA-CPhysician Assistant1255853917
- Shelby Casper, FNP-BCFamily Nurse Practitioner1821886144
- Melissa Casperson, CPNP-PCPediatric Nurse Practitioner1508375767
- Krysta CassSurgical Physician Assistant1679075410
- Maureen Cassady, MDPsychiatry Physician1386149797
- Nicole CassarinoPsychiatry Physician1427997600
- Mary Ann Cassel, M.A.Audiologist1396750709
- Anna Cassell, MD, MBA, MPHILHospitalist Physician1639756430
- Rachel Casseres, MDPsychiatry Physician1386272177
- Anilady Casserino, ARNPFamily Nurse Practitioner1407390636
- Morgan CassfordAudiologist1285567974
- Susan Cassiani, BSN,RN,CDEDiabetes Educator Registered Nurse1639682198
- Brett Cassidy, MDAnatomic Pathology & Clinical Pathology Physician1255126520
- Caroline Cassidy, PA-CPhysician Assistant1669165999
- Charles Cassidy, M.D.Orthopaedic Hand Surgery Physician1053351585
- Douglas CassidyStudent in an Organized Health Care Education/Training Program1487413746
- Michael Cassidy, M.D.Surgical Oncology Physician1114186905
- Ryan Cassidy, MDSurgery Physician1689377970
- Carolyn Cassill, PH.D.Psychologist1801479639
- Natalie Cassis, DDSGeneral Practice Dentistry1649686759
- Jenna Cassoli, LCSWClinical Social Worker1306238969
- Clark Cassone, MSN, FNP-BCNurse Practitioner1720335615
- Alfonso Casta, MDAnesthesiology Physician1861460149
- Peter Castaldi, M.D.Internal Medicine Physician1902891062
- Lorraine Castaldo, RDRenal Nutrition Registered Dietitian1144346016
- Carmen Castaneda MojenaDentist1881560720
- Morgan Castanet, CRNACertified Registered Nurse Anesthetist1427561919
- Juliana Castedo, MDFamily Medicine Physician1992191167
- Emily CasteenInternal Medicine Physician1215875570
- Shahar Castel, PA-CPhysician Assistant1275194490
- Flavia Castelino, M.D.Rheumatology Physician1962611301
- Alyssa Castellani, LCSWSocial Worker1740905686
- Daniel Castellanos, M.D.Pediatric Cardiology Physician1003298126
- Lina CastellanosStudent in an Organized Health Care Education/Training Program1356935480
- Mario Castellanos, MDEmergency Medicine Physician1164050910
- Juan Pablo Castello, MDStudent in an Organized Health Care Education/Training Program1366022675
- Chiara Castellucci, D.M.D.Dentist1649620873
- Enrico CastellucciStudent in an Organized Health Care Education/Training Program1821354622
- Federico Castellucci, D.M.D.Prosthodontics1861897175
- Coleen Caster, RN,C, MN, FNPFamily Nurse Practitioner1740448570
- Mark Castera, MDNeonatal-Perinatal Medicine Physician1649775396
- Natalie Castile, LCSWClinical Social Worker1699433714
- Cindy CastilloEndodontics1922663400
- David CastilloMental Health Counselor1841155447
- Elizabeth Castillo, MD PHDGeriatric Medicine (Internal Medicine) Physician1932176443
- Hector Castillo, MDOrthopaedic Surgery Physician1841819091
The largest Massachusetts cities
- Worcester13,166
- Springfield8,553
- Cambridge5,145
- Brockton4,287
- Milford3,459
How to read this directory
Boston, Massachusetts appears in the CMS National Plan and Provider Enumeration System with 41,865 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 Boston - 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 Boston 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 Boston is weighted toward Student in an Organized Health Care Education/Training Program (6,126 clinicians, followed by Internal Medicine Physician with 2,320 and Clinical Social Worker with 1,906). 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, Boston reports roughly 598 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 Massachusetts's most common specialties, Counselor is the most prominent one with no provider currently listing a Boston practice address, a coverage gap Boston patients typically fill by traveling to a larger nearby hub.
For Boston 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 Boston, MA?
There are 41,865 registered healthcare providers in Boston, MA, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.
What are the most common medical specialties in Boston?
The most common specialties in Boston are Student in an Organized Health Care Education/Training Program, Internal Medicine Physician, Clinical Social Worker, Physician Assistant, Anesthesiology Physician. Student in an Organized Health Care Education/Training Program has the most providers with 6,126.
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.