Doctors in Massachusetts: 23,129 enrolled in Medicare
Massachusetts has 23,129 MD and DO clinicians enrolled in Medicare in the CMS file dated Aug 18, 2026: 324 per 100,000 residents, 2nd of 51 (the states and DC), against 214 for the US. The most are in Boston, 7,738 in our physician files. Per capita Massachusetts is strongest in internal medicine physicians (2nd, 57.0 per 100,000), anesthesiologists (2nd, 21.2 per 100,000), psychiatrists (2nd, 20.1 per 100,000) and radiologists (2nd, 19.3 per 100,000).
By Ryan Doyle, founder of Doctor Email List. Published Oct 5, 2026.
Massachusetts physicians by specialty
Every specialty with at least one clinician in Massachusetts, largest first. Rank is among the states and DC (51 in all) by clinicians per 100,000 residents. Where we have a state page or a list for the specialty, the name links to it.
| Specialty | Massachusetts | Per 100,000 | Rank | US per 100,000 |
|---|---|---|---|---|
| Nurse Practitioners | 8,163 | 114 | 12th | 83.7 |
| Physician Assistants | 4,391 | 61.5 | 12th | 40.8 |
| Internal Medicine Physicians | 4,069 | 57.0 | 2nd | 30.9 |
| Family Physicians | 1,560 | 21.9 | 46th | 28.7 |
| Anesthesiologists | 1,516 | 21.2 | 2nd | 13.3 |
| Psychiatrists | 1,434 | 20.1 | 2nd | 8.4 |
| Radiologists | 1,374 | 19.3 | 2nd | 11.1 |
| Emergency Physicians | 1,282 | 18.0 | 6th | 13.5 |
| Optometrists | 1,002 | 14.0 | 17th | 10.9 |
| OB/GYNs | 968 | 13.6 | 3rd | 10.1 |
| Cardiologists | 935 | 13.1 | 2nd | 8.7 |
| Chiropractors | 770 | 10.8 | 30th | 11.8 |
| Neurologists | 760 | 10.6 | 2nd | 5.5 |
| Oncologists | 739 | 10.4 | 2nd | 5.0 |
| Hospitalists | 719 | 10.1 | 12th | 7.1 |
| Orthopedic Surgeons | 685 | 9.6 | 11th | 7.4 |
| Ophthalmologists | 589 | 8.3 | 2nd | 5.3 |
| General Surgeons | 562 | 7.9 | 17th | 6.9 |
| Gastroenterologists | 539 | 7.6 | 2nd | 4.7 |
| Pathologists | 519 | 7.3 | 3rd | 3.8 |
| Dermatologists | 508 | 7.1 | 2nd | 4.0 |
| Pediatricians | 498 | 7.0 | 3rd | 3.8 |
| Pulmonologists | 446 | 6.2 | 2nd | 3.4 |
| Endocrinologists | 374 | 5.2 | 2nd | 2.1 |
| Podiatrists | 321 | 4.5 | 18th | 4.7 |
| Infectious Disease Physicians | 299 | 4.2 | 2nd | 2.1 |
| ENTs | 283 | 4.0 | 5th | 2.9 |
| Nephrologists | 282 | 4.0 | 4th | 2.9 |
| Urologists | 271 | 3.8 | 5th | 3.0 |
| Physiatrists | 230 | 3.2 | 12th | 2.7 |
| Rheumatologists | 211 | 3.0 | 2nd | 1.6 |
| Radiation Oncologists | 186 | 2.6 | 2nd | 1.6 |
| Critical care physicians | 174 | 2.4 | 8th | 1.8 |
| Allergists | 146 | 2.0 | 2nd | 1.1 |
| Neurosurgeons | 139 | 1.9 | 16th | 1.7 |
| Plastic Surgeons | 130 | 1.8 | 8th | 1.4 |
| Cardiothoracic Surgeons | 128 | 1.8 | 5th | 1.2 |
| Vascular Surgeons | 120 | 1.7 | 6th | 1.2 |
| Hospice and palliative care physicians | 100 | 1.4 | 5th | 0.7 |
| Geriatric medicine physicians | 86 | 1.2 | 6th | 0.6 |
| Hematologists | 63 | 0.9 | 3rd | 0.3 |
| Sports medicine physicians | 61 | 0.9 | 15th | 0.7 |
| Pain Management Physicians | 53 | 0.7 | 49th | 1.4 |
| Colorectal surgeons | 44 | 0.6 | 13th | 0.5 |
| General practice physicians | 34 | 0.5 | 46th | 1.2 |
| Addiction medicine physicians | 32 | 0.4 | 5th | 0.2 |
| Sleep medicine physicians | 30 | 0.4 | 18th | 0.3 |
| Nuclear medicine physicians | 13 | 0.2 | 20th | 0.2 |
| Preventive medicine physicians | 11 | 0.2 | 17th | 0.2 |
| Micrographic dermatologic surgeons | 9 | 0.1 | 31st | 0.2 |
| Osteopathic manipulative medicine physicians | 7 | 0.1 | 47th | 0.3 |
Counts are one row per NPI under the clinician's primary Medicare specialty, from the CMS file dated Aug 18, 2026. Rates use the Census Bureau's July 2024 estimate for Massachusetts. Nurse practitioners, physician assistants, chiropractors and optometrists have their own files and are not in the MD and DO total. Massachusetts ranks lowest per capita in pain management physicians (49th, 0.7 per 100,000).
Where Massachusetts physicians practice
In the 21,622 clinicians Massachusetts has across the physician specialty files we sell, counted once each, 45% are women and 37% offer telehealth. The median graduation year is 2005. These are the cities with the most of them.
| City | Clinicians | Share of Massachusetts |
|---|---|---|
| Boston | 7,738 | 36% |
| Worcester | 1,428 | 6.6% |
| Burlington | 942 | 4.4% |
| Springfield | 664 | 3.1% |
| Cambridge | 527 | 2.4% |
Largest practice groups in Massachusetts
Groups ranked by the number of Massachusetts clinicians the CMS file lists under them. 86% of Massachusetts physicians with a group on file are in a group of 50 or more listed clinicians, against 80% across the US.
| Practice or health system, as CMS prints it | Massachusetts clinicians listed |
|---|---|
| Massachusetts General Physicians Organization Inc | 2,268 |
| Brigham and Womens Physicians Organization Inc | 1,765 |
| Umass Memorial Medical Group Inc | 1,404 |
| Harvard Medical Faculty Phys at Beth Israel Deaconess Med Ctr Inc | 1,156 |
| Lahey Clinic Inc | 665 |
A health system can appear under more than one legal name, so a group here may be part of a larger one.
Questions about Massachusetts doctors
23,129 MD and DO clinicians in Massachusetts are enrolled in Medicare in the CMS file dated Aug 18, 2026, one per NPI, in the state of their main practice location. That is 324 per 100,000 residents, 2nd of 51 among the states and DC. Physicians who bill no Medicare patients are not in the file.
Nurse Practitioners are the largest group in Massachusetts, with 8,163, then physician assistants with 4,391. Nurse practitioners and physician assistants are counted in their own files and are not in the MD and DO total.
We sell national lists, one CSV per specialty for $295, or every specialty in one file for $995. We don't sell a state-only file. City, state and ZIP are on nearly every row, so keeping the Massachusetts rows is one filter in any spreadsheet.
States with a similar count per capita
Specialty email lists
National CSVs, one per specialty. City, state and ZIP are on the rows, so any state is one filter away.