John T. Larossa, M.D.
Specialist · Newton, MA
John T. Larossa, M.D. is a specialist with a practice address in Newton, Massachusetts, and NPI 1346217155, issued on Mar 1, 2006. Check the license (Massachusetts 36773, as entered in NPPES) with the Massachusetts board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- John T. Larossa
- Credential
- M.D.
- Primary taxonomy
- Specialist 174400000X
- License number
- 36773 MA
Self-reported in NPPES; status is on the state search - Practice location
- 2000 Washington St, Newton, MA 02462
- Phone
- (617) 244-1311
- Enumerated
- Mar 1, 2006
- Record last updated
- Jul 13, 2026
- Fax
- (617) 244-2819
- Medicaid ID
- 2051524 MA
- Medicare enrollment
- Enrolled (PECOS I20051029000058); accepts Medicare assignment
- Medical or professional school
- Tufts University School Of Medicine, 1973
- Entity
- Type 1 · individual
8 nearest specialist records → All 1,096 in Massachusetts → Look up another NPI →
Also registered at 2000 Washington St
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Verify John T. Larossa in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Massachusetts board licenses this profession
Search for license 36773Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
95% more Medicare Part D claims than the average specialist in 2024
2,697 Medicare Part D claims for 307 beneficiaries, against an average of 1,380 among the 8,233 providers of this specialty who prescribed in Part D. Brand-name drugs were 40% of claims. 25 claims were for opioids.
Most prescribed
- Levothyroxine Sodium362 claims
- Jardiance257 claims
- Metformin Hcl169 claims
- Ozempic118 claims
- Glipizide110 claims
- Synthroid90 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.
John T. Larossa among 1,096 specialist records in Massachusetts
John T. Larossa, M.D. is one of 1,096 specialist records with a practice address in Massachusetts. 15% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 69% newer
- In a Medicare fileYes · 15% of these records are
- In the CMS Doctors and Clinicians fileYes · 12% of these records are
- Graduated1973 · median 1989 among the 128 with a school on file
- Record last updated2026 · 82% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Specialist providers in Massachusetts
There are 1,096 specialist records in Massachusetts.
All 1,096 in Massachusetts → Every provider in Newton → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Mark Goldman, M.D.Newton, MA 024621215997846
- Henry Lerner, MDNewton, MA 024621316033343
- Timothy O'Connor, MDNewton, MA 024621124095997
- Joel Rubenstein, M.D.Newton, MA 024621689634164
- Giulia Sheftel, M.D.Newton, MA 024621770543696
- Jeffrey Wisch, MDNewton, MA 024621871560664
- Dorothy Norcross, IBCLCNewton, MA 024611659586659
- Arthur Barsky, M.D.W Newton, MA 024651396746681
Common questions
What is John T. Larossa, M.D.'s NPI number?
John T. Larossa, M.D.'s National Provider Identifier (NPI) is 1346217155, issued on Mar 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John T. Larossa, M.D. located?
The NPPES record lists a practice address at 2000 Washington St, Newton, MA, 02462. Phone: (617) 244-1311. Providers update this record themselves, so call before visiting.
How can I verify John T. Larossa, M.D.'s license?
NPPES lists Massachusetts license number 36773, as entered by the provider. Search the Massachusetts board that licenses this profession; the NPPES record confirms identity only.
How much does John T. Larossa, M.D. prescribe under Medicare Part D?
In 2024, John T. Larossa, M.D. had 2,697 Medicare Part D claims for 307 beneficiaries; the average among specialist prescribers was 1,380. 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.