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 60 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. Anup KarlathDorchester, MA 021241184026635
  2. Samantha Karle, MDBoston, MA 021141831891639
  3. Bruce Karlin, MDWorcester, MA 016051245311166
  4. Huda Karman, MDSalem, MA 019701275111429
  5. Samuel KarmiyBoston, MA 021111083293492
  6. Joseph Karpicz, M.D.Salem, MA 019701144294935
  7. Nicholas Karr, MDSpringfield, MA 011071609365691
  8. Douglas Karrel, M.D.Adams, MA 012201457333437
  9. Andrew Karson, MDWorcester, MA 016551194706002
  10. Tom Karson, M.D.Boston, MA 021181497958961
  11. Anand Kartha, M.D,, M.SCWest Roxbury, MA 021321457361727
  12. Elizabeth Karwowski, M.D.Boston, MA 021301487690699
  13. Robert Kasabian, MDNorwell, MA 020611912989492
  14. Parnag Kasarjian, M.D.Brookline, MA 024461114966207
  15. Mitchell Kase, M.D.Billerica, MA 018211497701650
  16. Rebecca Kasenge, D.O.Sutton, MA 015901629121660
  17. Ivi Kasimati, MDQuincy, MA 021711205921160
  18. Bilal Kaskar, MDBrighton, MA 021351265478440
  19. Jean Kasmer, M.D.Cambridge, MA 021381780631473
  20. Elizabeth Kass, M.D.Boston, MA 022151710906169
  21. Christina Kassab, D.O.Burlington, MA 018051558709626
  22. Noor Kassamali, MDLexington, MA 024201326004870
  23. Gerald Kassels, M.D.Boston, MA 021141093797599
  24. Steven Kassels, MDWestfield, MA 010851154458735
  25. Zachary KassirBoston, MA 022151346971546
  26. Jerome Kassirer, M.D.Wellesley, MA 024811184663189
  27. Mark Kassis, M.D.Springfield, MA 011071356309744
  28. Samir Kassissieh, MDBurlington, MA 018051922107077
  29. Paul Kasuba, MDWatertown, MA 024721851389969
  30. Sai Sriram Katada, MDWorcester, MA 016081699453043
  31. Deepak Kataria, M.D.Boston, MA 021241215623061
  32. Christos Katavolos, M.D.Brockton, MA 023011417911611
  33. Benjamin KatcherBoston, MA 021111518751700
  34. Donna Katcher, MDArlington, MA 024761780681031
  35. Sekar Kathiresan, MDBoston, MA 021141134101280
  36. Anilkumar Katta, M.D.Boston, MA 022151740444991
  37. Douglas Katz, MDAndover, MA 018101780693820
  38. Ingrid Katz, M.D.Boston, MA 021151043235740
  39. Martha Katz, MDCambridge, MA 021381942213517
  40. Nurit Katz, MDBrighton, MA 021351295121515
  41. Ronald Katz, M.D.Brookline, MA 024451508834011
  42. Harry Katz-Pollak, MDWhitman, MA 023821831172774
  43. John Katzenberg, M.D.Townsend, MA 014691265426076
  44. Daniel Katzman, MDCambridge, MA 021381609138130
  45. Laurie Katzman, MDChestnut Hill, MA 024671881650125
  46. Michael Kauffman, MD, PHDConcord, MA 017421275669418
  47. Robert Kauffman, MD, PHDCambridge, MA 021391750414355
  48. Alexander KaufmanBoston, MA 021111508569450
  49. Jennifer Kaufman, MDChestnut Hill, MA 024671740205400
  50. Julie Kaufman, M.D.Boston, MA 021091487622536

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.