NPPES file of Aug 9, 2026

Internal Medicine Physician in Massachusetts

6,825 NPPES records list internal medicine physician with a practice address in Massachusetts, 97 per 100,000 residents, the 2nd highest rate of 51. Boston and Worcester have the most; each record links to the provider's NPI and the Massachusetts license search. Page 91 of 137.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 207R00000X · method

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

Boston has the most, 2,320

  1. Boston2,320
  2. Worcester448
  3. Cambridge300
  4. Springfield282
  5. Burlington144

Internal Medicine Physician records in Massachusetts

  1. Unoma Okoli, MBBSCambridge, MA 021381952983306
  2. Noreen Okwara, MDBoston, MA 021151013437649
  3. Opeyemi Olabisi, MD, PHDBoston, MA 021141104052612
  4. Peter Olds, M.D.Boston, MA 021151841603263
  5. Robert Oldshue, MDJamaica Plain, MA 021301881651255
  6. Nicolette Oleng, MDBoston, MA 021181104142520
  7. L Oliver, MDBoston, MA 021141124019500
  8. Michelle Oliveri, DNP, FNP-BCConcord, MA 017421437048337
  9. Margaret OliverioWestborough, MA 015811740631233
  10. Hannah Olivet, MDCambridge, MA 021391750580197
  11. Sarah OlofssonWest Roxbury, MA 021321427517200
  12. Katie Olsen, MDSpringfield, MA 011071205006665
  13. Alex OlsonBoston, MA 021111053250019
  14. Laura Olson, MDRevere, MA 021511093705642
  15. Rose Olson, MDBoston, MA 021151285195248
  16. Joel Olubodun, M.D.Hyde Park, MA 021361700805835
  17. Olayemi Olubowale, MDBoston, MA 021141528701620
  18. Daniele Olveczky, MD, MSCBoston, MA 022151124075163
  19. Terrence Omalley, MDBoston, MA 021091083605612
  20. Steven Omansky, MDBoston, MA 021181568950467
  21. Dorina Omari, M.D.Beverly, MA 019151083792121
  22. Joseph Omlor, MDCambridge, MA 021381124432869
  23. Kathleen Oneil-Smith, MDMalden, MA 021481891775185
  24. Douglas Oneill, MDNorth Adams, MA 012471003893082
  25. Issam Oneyssi, M.D.Southbridge, MA 015501528026622
  26. Nneka Onwubueke, M.D.Worcester, MA 016551518949767
  27. Kay Thi Oo, MDSpringfield, MA 011071184110538
  28. Paul Oppenheimer, MDSpringfield, MA 011041073570560
  29. Mohamed OrabiBoston, MA 021151649914656
  30. Joshua Orabone, M.D., M.P.H.Clinton, MA 015101285927343
  31. Johanna Marie Orejo, MDWeymouth, MA 021901275195620
  32. Gerry Orfanos, MDBurlington, MA 018031205934064
  33. Seo Yeon Orite, MDBoston, MA 021351831830553
  34. Ariela Orkaby, M.D.Boston, MA 021301114238961
  35. Jay Orlander, M.D.West Roxbury, MA 021321316985690
  36. Lina Ortega, MDBoston, MA 021151083027072
  37. Eduardo Ortiz, MD, MPHBoston, MA 021201972576791
  38. Fausto Ortiz, MDBoston, MA 021181073741427
  39. Iximarie Ortiz-Romero, M.D.Worcester, MA 016051922235654
  40. Dawn Osborne, M.D.Boston, MA 021161225050743
  41. Patricia Oshea, MDBoston, MA 024671467484725
  42. Samuel Osher, MDCambridge, MA 021381174636112
  43. Stephanie Osiecki, MDBoston, MA 021141922080464
  44. Magdi Osman, M.D.Revere, MA 021511780628404
  45. Nora Osman, MDBoston, MA 021151023074598
  46. Sara Osman, MDBoston, MA 021351790946697
  47. Dagmara Osmanska-Jac, M.DChelmsford, MA 018241053413138
  48. Luis OsorioSpringfield, MA 011991013544485
  49. Natalie Osorio, MDAuburn, MA 015011215902846
  50. Nicolai Ostberg, MDCambridge, MA 021381518714583

Source: CMS NPPES, primary taxonomy 207R00000X: records by practice city and the list of records, file of Aug 9, 2026.

Massachusetts ranks 2 of 51 per resident

  1. District of Columbia133
  2. Massachusetts97
  3. Rhode Island94
  4. Connecticut73
  5. 50 states and D.C.44

Source: CMS NPPES, primary taxonomy 207R00000X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

74.5% of these records appear in a Medicare file, against 78.7% nationally

A Medicare file here is Part D prescribing (2024), a MIPS score (2023), an Open Payments record (2024) or Medicare group billing (CMS Doctors and Clinicians). A record outside them may still see patients: these files cover Medicare only.

  1. Massachusetts74.5%
  2. United States78.7%

Internal Medicine Physician records in Massachusetts, measured

  • In a Medicare file5,088 of 6,825 · 74.5% here, 78.7% nationally
  • In the CMS Doctors and Clinicians file4,103 · 60.1% here, 61.4% nationally
  • Not updated in five years or more4,346 · 63.7% here, 55.4% nationally
  • Median graduation year2004 · the 4,103 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 207R00000X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

6,825 NPPES records list internal medicine physician (207R00000X) as their primary taxonomy with a practice address in Massachusetts: 97 per 100,000 residents against 44 nationally (50 states and D.C.). Boston has 2,320 of them (34%).

A record is a registration a provider made and keeps up to date: it shows neither that the provider is licensed nor that they still practice there. The state's own license search is the check.

States with a similar number

  1. Illinois7,238
  2. Pennsylvania7,300
  3. Michigan5,735
  4. Ohio5,277

States with a similar rate per 100,000

  1. Rhode Island94.3
  2. Connecticut72.5
  3. Maryland63.2
  4. Hawaii62.9

The largest states

  1. California17,696
  2. New York12,067
  3. Florida10,151
  4. Texas9,175
  5. Pennsylvania7,300

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy; 2023 Census population estimates. A registry record is not a license.

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.