Tom Harry Karson, M.D.
Internal Medicine Physician · Boston, MA
Tom Harry Karson, M.D. is an internal medicine physician with a practice address in Boston, Massachusetts, and NPI 1497958961, issued on Jun 11, 2007. Check the license (Massachusetts 150393, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Tom Harry Karson
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 150393 MA
Self-reported in NPPES; status is on the state search - Practice location
- 72 E. Concord St, Boston, MA 02118
- Phone
- (617) 638-6100
- Enumerated
- Jun 11, 2007
- Record last updated
- Dec 6, 2019 (not updated in 7 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →
Also registered at 72 E. Concord St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Yves FredericFamily Nurse Practitioner1912391970
- Xi Liu, DNP, APRN, FNP-BCFamily Nurse Practitioner1477996163
- Tara Salstein, NPAdult Health Nurse Practitioner1780136374
Verify Tom Harry Karson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 150393Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
77% fewer Medicare Part D claims than the average internal medicine physician in 2024
723 Medicare Part D claims for 161 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 18% of claims.
Most prescribed
- Amlodipine Besylate47 claims
- Atorvastatin Calcium42 claims
- Lisinopril40 claims
- Losartan Potassium29 claims
- Omeprazole28 claims
- Metformin Hcl26 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Tom Harry Karson among 6,825 internal medicine physician records in Massachusetts
Tom Harry Karson, M.D. is one of 6,825 internal medicine physician records with a practice address in Massachusetts. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 46% of them.
- NPI issued2007 · 46% of these records are older, 45% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 60% of these records are
- Record last updated2019 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
2,320 internal medicine physician records list a practice address in Boston
They are 2,320 of the 41,865 NPPES records with a practice address in Boston, and 6,825 internal medicine physician records in Massachusetts.
All 6,825 in Massachusetts → Every provider in Boston → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Daniel Alford, M.D., M.P.H.Boston, MA 021181194708628
- Lori Balestrero, MDBoston, MA 021181750384046
- Virginia Barrow, M.D.Boston, MA 021181639175466
- Monica Bharel, MDBoston, MA 021181093798084
- Claire Carlo, M.D.Boston, MA 021181336125871
- Chava Chapman, M.D., M.P.H.Boston, MA 021181558346239
- Paul Fallon, MDBoston, MA 021181437145927
- Irene Gavras, M.D.Boston, MA 021181619953601
Common questions
What is Tom Harry Karson, M.D.'s NPI number?
Tom Harry Karson, M.D.'s National Provider Identifier (NPI) is 1497958961, issued on Jun 11, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Tom Harry Karson, M.D. located?
The NPPES record lists a practice address at 72 E. Concord St, Boston, MA, 02118. Phone: (617) 638-6100. Providers update this record themselves, so call before visiting.
How can I verify Tom Harry Karson, M.D.'s license?
NPPES lists Massachusetts license number 150393, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Tom Harry Karson, M.D. prescribe under Medicare Part D?
In 2024, Tom Harry Karson, M.D. had 723 Medicare Part D claims for 161 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it 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.