Leonard A. Grossman, M.D.
Rheumatology Physician · Princeton, NJ
Leonard A. Grossman, M.D. is a rheumatology physician with a practice address in Princeton, New Jersey, and NPI 1578600136, issued on Jan 31, 2007. Check the license (New Jersey 25MA03747400, as entered in NPPES) on the New Jersey State Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Leonard A. Grossman
- Credential
- M.D.
- Primary taxonomy
- Rheumatology Physician 207RR0500X
- License number
- 25MA03747400 NJ
Self-reported in NPPES; status is on the state search - Practice location
- 419 N Harrison St, Princeton, NJ 08540
- Phone
- (609) 924-9300
- Enumerated
- Jan 31, 2007
- Record last updated
- Mar 12, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (609) 430-9481
- Medicaid ID
- 1651404 NJ
- Entity
- Type 1 · individual
8 nearest rheumatology physician records → All 253 in New Jersey → Look up another NPI →
Also registered at 419 N Harrison St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Leonard A. Grossman in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Jersey State Board of Medical Examiners
Search for license 25MA03747400Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average rheumatology physician in 2024
54 Medicare Part D claims for 20 beneficiaries, against an average of 1,978 among the 6,301 providers of this specialty who prescribed in Part D.
Most prescribed
- Hydroxychloroquine Sulfate15 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.
Leonard A. Grossman among 253 rheumatology physician records in New Jersey
Leonard A. Grossman, M.D. is one of 253 rheumatology physician records with a practice address in New Jersey. 86% 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, 44% newer
- In a Medicare fileYes · 86% of these records are
- In the CMS Doctors and Clinicians fileNo · 75% of these records are
- Record last updated2008 · 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 207RR0500X and a New Jersey practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Rheumatology Physician providers in New Jersey
There are 253 rheumatology physician records in New Jersey.
All 253 in New Jersey → Every provider in Princeton → Rheumatology Physician nationwide →
The 8 rheumatology physician records with the nearest ZIP codes
- Anand Patel, MDPrinceton, NJ 085401669911863
- R Roberts, MDPrinceton, NJ 085401396735429
- Ranju Singh, MDPrinceton, NJ 085401447308846
- Kudret Arslan, MDPlainsboro, NJ 085361255950457
- Sehris Khawaja, DOPennington, NJ 085341669888376
- Sajina Prabhakaran, M.DPennington, NJ 085341437310661
- William Torelli, D.O.Pennington, NJ 085341407247398
- Randall Krakauer, MDPrinceton Junction, NJ 085501588811012
Common questions
What is Leonard A. Grossman, M.D.'s NPI number?
Leonard A. Grossman, M.D.'s National Provider Identifier (NPI) is 1578600136, issued on Jan 31, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Leonard A. Grossman, M.D. located?
The NPPES record lists a practice address at 419 N Harrison St, Princeton, NJ, 08540. Phone: (609) 924-9300. Providers update this record themselves, so call before visiting.
How can I verify Leonard A. Grossman, M.D.'s license?
NPPES lists New Jersey license number 25MA03747400, as entered by the provider. Search the New Jersey State Board of Medical Examiners at https://newjersey.mylicense.com/verification/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Leonard A. Grossman, M.D. prescribe under Medicare Part D?
In 2024, Leonard A. Grossman, M.D. had 54 Medicare Part D claims for 20 beneficiaries; the average among rheumatology physician prescribers was 1,978. 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.