Jacob Josef Kantrowitz, MD
Internal Medicine Physician · Boston, MA
Jacob Josef Kantrowitz, MD is an internal medicine physician with a practice address in Boston, Massachusetts, and NPI 1871055749, issued on Apr 1, 2019. Check the license (Massachusetts 285073, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Jacob Josef Kantrowitz
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 285073 MA
LP04711 RI
Self-reported in NPPES; status is on the state search - Practice location
- 2100 Dorchester Ave, Boston, MA 02124
- Phone
- (617) 506-4000
- Enumerated
- Apr 1, 2019
- Record last updated
- Aug 12, 2022
- Medicare enrollment
- Enrolled (PECOS I20220824001114); accepts Medicare assignment
- Medical or professional school
- Boston University School Of Medicine, 2019
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →
Also registered at 2100 Dorchester Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Jacob Josef Kantrowitz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 285073Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
1% more Medicare Part D claims than the average internal medicine physician in 2024
3,205 Medicare Part D claims for 203 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims. 199 claims were for opioids.
Most prescribed
- Atorvastatin Calcium239 claims
- Amlodipine Besylate137 claims
- Lisinopril112 claims
- Pravastatin Sodium89 claims
- Omeprazole86 claims
- Gabapentin83 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.
Bills Medicare through one group practice
- Pratt Medical Group IncBoston, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jacob Josef Kantrowitz among 6,825 internal medicine physician records in Massachusetts
Jacob Josef Kantrowitz, MD 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 2019, is newer than 84% of them.
- NPI issued2019 · 84% of these records are older, 13% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2019 · median 2004 among the 4,103 with a school on file
- Record last updated2022 · 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
- Barbara Berland, M.D.Dorchester Center, MA 021241790775732
- Marvin Diaz-Lacayo, M.D.Dorchester Center, MA 021241477590214
- Natalia Ganson-Myshkin, M.D.Dorchester Center, MA 021241457340515
- Adam Gladstone, M.D.Dorchester Center, MA 021241437187283
- Rachel Hindin, MDDorchester, MA 021241134163462
- Ritche Mikl Lero, M.D.Dorchester, MA 021241235309014
- Sheldon Lockman, M.D.Dorchester Center, MA 021241245229392
- Kyaw Lwin, MD, MPHDorchester Center, MA 021241972767671
Common questions
What is Jacob Josef Kantrowitz, MD's NPI number?
Jacob Josef Kantrowitz, MD's National Provider Identifier (NPI) is 1871055749, issued on Apr 1, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Jacob Josef Kantrowitz, MD located?
The NPPES record lists a practice address at 2100 Dorchester Ave, Boston, MA, 02124. Phone: (617) 506-4000. Providers update this record themselves, so call before visiting.
How can I verify Jacob Josef Kantrowitz, MD's license?
NPPES lists Massachusetts license number 285073, 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 Jacob Josef Kantrowitz, MD prescribe under Medicare Part D?
In 2024, Jacob Josef Kantrowitz, MD had 3,205 Medicare Part D claims for 203 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.