Justin Isaac Lowenthal, MD, PHD
Internal Medicine Physician · Boston, MA
Justin Isaac Lowenthal, MD, PHD is an internal medicine physician with a practice address in Boston, Massachusetts, and NPI 1891185617, issued on Feb 1, 2015. Check the license (Massachusetts 1028320, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Justin Isaac Lowenthal
- Credential
- MD, PHD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 1028320 MA
Self-reported in NPPES; status is on the state search - Practice location
- 75 Francis St, Boston, MA 02115
- Phone
- (617) 732-5775
- Enumerated
- Feb 1, 2015
- Record last updated
- Jul 16, 2026
- Medicaid ID
- 110205069A MA
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →
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Verify Justin Isaac Lowenthal in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 1028320Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average internal medicine physician in 2024
129 Medicare Part D claims for 25 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of 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.
Justin Isaac Lowenthal among 6,825 internal medicine physician records in Massachusetts
Justin Isaac Lowenthal, MD, PHD 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 2015, is newer than 74% of them.
- NPI issued2015 · 74% of these records are older, 23% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 60% of these records are
- Record last updated2026 · 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
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- Mark Friedberg, M.D.Boston, MA 021151437149184
- Jaye Hefner, MDBoston, MA 021151053384867
- Allen Kachalia, MD JDBoston, MA 021151346231982
- Daniel Kuritzkes, MDBoston, MA 021151114917416
- Sylvia McKean, MDBoston, MA 021151316938954
Common questions
What is Justin Isaac Lowenthal, MD, PHD's NPI number?
Justin Isaac Lowenthal, MD, PHD's National Provider Identifier (NPI) is 1891185617, issued on Feb 1, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Justin Isaac Lowenthal, MD, PHD located?
The NPPES record lists a practice address at 75 Francis St, Boston, MA, 02115. Phone: (617) 732-5775. Providers update this record themselves, so call before visiting.
How can I verify Justin Isaac Lowenthal, MD, PHD's license?
NPPES lists Massachusetts license number 1028320, 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 Justin Isaac Lowenthal, MD, PHD prescribe under Medicare Part D?
In 2024, Justin Isaac Lowenthal, MD, PHD had 129 Medicare Part D claims for 25 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.