Dr. Leonard A. Grossman, MD
- Medicare services, 2022
- 2,703
- Part D claims, 2024
- 54
- Industry payments
- $242
- Insurance carriers
- 1
- State licenses
- 2
- Practice address
- 1 Research Way, Princeton, NJ 08540
- Practice phone
- Call (609) 924-9300
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Grossman's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Leonard A. Grossman is a rheumatologist in Princeton, New Jersey
Dr. Grossman practices in Princeton, New Jersey.
Dr. Grossman's NPI, 1578600136, was assigned on January 31, 2007. Dr. Grossman graduated from Albert Einstein College of Medicine in 1975. Dr. Grossman's New Jersey license number on file is 25MA03747400.
- NPI
- 1578600136NPI Registry (opens in a new tab)
- NPI enumeration date
- January 31, 2007
- NPI status
- Active
- Practice phone
- (609) 924-9300
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 77
- Medical school graduation
- 1975
Sources: NPPES NPI Registry (CMS); and Dmand AI Professional Profile Data
Dr. Leonard A. Grossman's practice address is in Princeton, New Jersey
Dr. Grossman's practice address in the NPI Registry is 1 Research Way, Princeton, NJ 08540, in Mercer County. The practice phone is (609) 924-9300.
- NPI Registry address1 Research Way, Princeton, NJ 08540 · Mercer CountyPhone(609) 924-9300
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dmand AI tracks the EHR system at Dr. Leonard A. Grossman's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Grossman practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dr. Grossman's practice | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Leonard A. Grossman is one of 234 rheumatologists in New Jersey
Rheumatology is Dr. Grossman's primary specialty in the NPI Registry, under taxonomy code 207RR0500X. Dmand AI has Dr. Grossman's licenses on file in 2 states: New Jersey and Pennsylvania.
Specialties and state licenses
- Rheumatology, New JerseyPrimary
- Pennsylvania license
Clinical focus
Dmand AI lists hand joint or tendon inflammation and lower back pain among the conditions Dr. Grossman treats.
Rheumatologists near Dr. Grossman
Counts of rheumatologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Leonard A. Grossman billed Medicare for 2,703 services in 2022
CMS data shows 2,703 Medicare services from Dr. Grossman across 8 procedure codes in 2022. Medicare paid $62,137 for them. Every service was in an office.
Dr. Grossman's Medicare services by type, 2021 to 2022
- 2021
- 2022
- Drugs given in the office
- 2021: 2,0042022: 2,0402%
- Office and hospital visits
- 2021: 2752022: 276No change
- Lab and pathology
- 2021: 3392022: 22534%
- Surgery
- 2021: 1692022: 11731%
- Tests and treatments
- 2021: 872022: 4548%
- Other services
- 2021: 152022: 0100%
Dr. Grossman compared with the New Jersey median for rheumatologists, 2022
- Dr. Grossman
- New Jersey median
- Medicare services
- 2,703vs 3,99532% below
- Part D claims
- 15vs 1,06499% below
Medians across 237 rheumatologists in New Jersey with Dmand AI profiles that report each measure.
Dr. Grossman's most billed Medicare procedure codes, 2022
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Grossman?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Grossman and other rheumatologists in New Jersey.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Leonard A. Grossman's patients have a median age of 76
Across all payers, Dmand AI patient panel data puts Dr. Grossman's median patient age at 76, with 37% women.
Dr. Grossman's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 76
Patient panel by sex, all payers
- Women37%
- Men52%
Source: Dmand AI Patient Panel Data
Dr. Leonard A. Grossman wrote 54 Medicare Part D claims in 2024
In 2024, Dr. Grossman wrote 54 Medicare Part D claims for 20 patients. 89% of them were for generic drugs. CMS names the drug for 15 of them, across 1 drug with 11 or more claims each, at $791 in total drug cost. In 2023, CMS named 178 claims across 7 drugs.
Dr. Grossman's Part D claims by kind of drug, 2024
- Generic48 claims89%
- Brand-name and other6 claims11%
Dr. Grossman's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1782024: 1592%
Drugs named by CMS: 1 in 2024, 7 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
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Dr. Leonard A. Grossman received $242 in industry payments from 2018 to 2019
CMS Open Payments shows 28 general payments to Dr. Grossman from 4 drug and device companies from 2018 to 2019. Food and beverage make up the largest share, 56% of the total. Genentech, Inc. paid the most, $204.
General payments to Dr. Grossman by program year, 2018 to 2019
General payments to Dr. Grossman by kind, 2018 to 2019
- Food and beverage$13656%
- Education$10644%
Companies that paid Dr. Grossman the most, 2018 to 2019
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Leonard A. Grossman has 1 award and honors on record
Dmand AI lists 1 award for Dr. Grossman, most recently CMS Stage 1 EHR in 2013.
Awards and honors for Dr. Grossman
- 2013
- CMS Stage 1 EHR
Source: Dmand AI Professional Profile Data
Dr. Leonard A. Grossman graduated from Albert Einstein College of Medicine
Dr. Grossman graduated from Albert Einstein College of Medicine in 1975. Dr. Grossman is a member of ACR.
- Medical school
Source: Dmand AI Professional Profile Data
Dr. Leonard A. Grossman accepts plans from 1 insurance carrier
Dr. Grossman is in network with 1 carrier, including Horizon Blue Cross Blue Shield of New Jersey. HMO plans come from the most carriers, 1. Check the plan with the practice before a visit.
- Horizon Blue Cross Blue Shield of New Jersey
Plan types Dr. Grossman accepts, by number of carriers
- HMO1
- Medicare1
- PPO1
Source: Dmand AI Insurance Network Data
Sources for Dr. Leonard A. Grossman's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Leonard A. Grossman
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Leonard A. Grossman's NPI number?
Dr. Leonard A. Grossman's NPI number is 1578600136. It was assigned on January 31, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Leonard A. Grossman?
Dr. Leonard A. Grossman is a rheumatologist in Princeton, New Jersey. The primary specialty in the NPI Registry is Rheumatology Physician (taxonomy code 207RR0500X).
Where does Dr. Leonard A. Grossman practice?
Dr. Grossman practices at 1 Research Way, Princeton, NJ 08540.
What is Dr. Leonard A. Grossman's office phone number?
The practice phone on file for Dr. Grossman is (609) 924-9300.
What is Dr. Leonard A. Grossman's medical license number?
Dr. Grossman's New Jersey license number on file is 25MA03747400, one of the licenses on file in 2 states.
Which states has Dr. Leonard A. Grossman been licensed in?
Dmand AI has state licenses on file for Dr. Grossman in New Jersey (1980 to 2023) and Pennsylvania (1989 to 2002).
Does Dr. Leonard A. Grossman accept Medicare?
Yes. CMS data shows Dr. Grossman billed Medicare for 2,703 services in 2022.
What services does Dr. Leonard A. Grossman bill to Medicare?
In 2022, Dr. Grossman's most billed Medicare services were injected or infused drug (J0897), office visit, established patient (99214) and office visit, established patient (99213).
Where did Dr. Leonard A. Grossman go to medical school?
Dr. Grossman graduated from Albert Einstein College of Medicine in 1975.
What drugs does Dr. Leonard A. Grossman prescribe most?
In 2024 Medicare Part D data, Dr. Grossman's most prescribed drugs by claims were Hydroxychloroquine Sulfate.
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Has Dr. Leonard A. Grossman received payments from drug or device companies?
CMS Open Payments shows $242 in general payments to Dr. Grossman from 4 companies from 2018 to 2019. The largest total came from Genentech, Inc.
How long has Dr. Leonard A. Grossman been practicing?
Dr. Grossman graduated from medical school in 1975, 51 years ago.
What insurance does Dr. Leonard A. Grossman accept?
Dr. Grossman is in network with 1 carrier, including Horizon Blue Cross Blue Shield of New Jersey. HMO plans come from the most carriers, 1. Check the plan with the practice before a visit.
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