Dr. James Benjamin Grossweiner, MD
- Medicare services, 2024
- 2,480
- Medicare patients, 2024
- 480
- Part D claims, 2024
- 732
- MIPS score, 2024
- 90
- Hospital affiliations
- 1
- Practice address
- 1220 Hobson Rd, Naperville, IL 60540
- Practice phone
- Call (630) 355-6660
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Grossweiner & Blaszak
Naperville, Illinois
Find Dr. Grossweiner's professional email, personal email and mobile number
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Dr. James Benjamin Grossweiner is a dermatologist in Naperville, Illinois
Dr. Grossweiner practices at Grossweiner & Blaszak in Naperville, Illinois.
Dr. Grossweiner's NPI, 1437114907, was assigned on April 19, 2006. Dr. Grossweiner graduated from R Franklin University of Med & Sci/Chicago Medical School in 1985. Dr. Grossweiner holds Illinois license 036-074040.
- NPI
- 1437114907NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3678761673
- NPI enumeration date
- April 19, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (630) 355-6660
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 67
- Medical school graduation
- 1985
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. James Benjamin Grossweiner practices at Grossweiner & Blaszak in Naperville, Illinois
Dr. Grossweiner's primary practice is Grossweiner & Blaszak, at 1220 Hobson Rd, Naperville, IL 60540 in Dupage County. The practice phone is (630) 355-6660.
- Grossweiner & Blaszak1220 Hobson Rd, Naperville, IL 60540 · Dupage CountyPhone(630) 355-6660
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. James Benjamin Grossweiner is affiliated with 3 sites of care and 1 medical group
Dr. Grossweiner's primary practice is Grossweiner & Blaszak in Naperville, Illinois. Dr. Grossweiner is also affiliated with Edward Hospital. The medical group on file is Grossweiner & Blaszak PC. Dmand AI also links Dr. Grossweiner to 1 more group practice or clinic, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. James Benjamin Grossweiner's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Grossweiner practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Grossweiner & Blaszak | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. James Benjamin Grossweiner is one of 564 dermatologists in Illinois
Dermatology is Dr. Grossweiner's primary specialty in the NPI Registry, under taxonomy code 207N00000X. Dr. Grossweiner is licensed in Illinois.
Specialties and state licenses
- Dermatology, IllinoisPrimary
Dermatologists near Dr. Grossweiner
Counts of dermatologists 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. James Benjamin Grossweiner billed Medicare for 2,480 services in 2024
CMS data shows 2,480 Medicare services from Dr. Grossweiner across 15 procedure codes in 2024, for 480 Medicare patients. Medicare paid $123,003 for them. Every service was in an office.
Dr. Grossweiner's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Surgery
- 2023: 2,2422024: 1,70724%
- Office and hospital visits
- 2023: 9322024: 77317%
Dr. Grossweiner compared with the Illinois median for dermatologists, 2024
- Dr. Grossweiner
- Illinois median
- Medicare services
- 2,480vs 1,77939% above
- Medicare patients
- 480vs 491Close to median
- Part D claims
- 619vs 40553% above
Medians across 526 dermatologists in Illinois with Dmand AI profiles that report each measure.
Dr. Grossweiner's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Grossweiner and other dermatologists in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. James Benjamin Grossweiner treated 480 Medicare patients in 2024, average age 75
CMS counts 480 Medicare patients who saw Dr. Grossweiner in 2024. The largest group is 65 to 74, with 231 patients. 75% of them have high cholesterol, and 67% have high blood pressure. Their average risk score is 0.91, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Grossweiner's median patient age at 69, with 45% women.
Dr. Grossweiner's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Grossweiner's Medicare patients by sex, 2024
- Women20443%
- Men27657%
Chronic conditions among Dr. Grossweiner's Medicare patients, 2024
- High cholesterol75%
- High blood pressure67%
- Arthritis42%
- Ischemic heart disease29%
- Diabetes20%
- Cancer16%
- Chronic kidney disease15%
- Anxiety14%
Share of Medicare patients with each condition. A patient can have several.
Dr. Grossweiner's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 69
Patient panel by sex, all payers
- Women45%
- Men53%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. James Benjamin Grossweiner wrote 732 Medicare Part D claims in 2024
In 2024, Dr. Grossweiner wrote 732 Medicare Part D claims for 281 patients. 95% of them were for generic drugs. CMS names the drug for 619 of them, across 21 drugs with 11 or more claims each, at $15,494 in total drug cost. In 2023, CMS named 733 claims across 20 drugs.
Dr. Grossweiner's Part D claims by kind of drug, 2024
- Generic696 claims95%
- Brand-name36 claims5%
Dr. Grossweiner'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.
Drug classes CMS tracks in Dr. Grossweiner's Part D claims, 2024
- Antibiotics7%52 of 732 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 7332024: 61916%
Drugs named by CMS: 21 in 2024, 20 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
Dr. James Benjamin Grossweiner scored 90 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 90 out of 100 for Dr. Grossweiner for performance year 2024, reported as part of a group. Dr. Grossweiner accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 350 procedures of skin biopsy by Dr. Grossweiner, more than 92% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Dr. Grossweiner's MIPS scores, performance year 2024
- 90of 100Final score
- 83.8of 100Quality
- 99of 100Promoting Interoperability
- 40of 100Improvement Activities
- 83of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Where Dr. Grossweiner ranks in Medicare procedure volume
- Skin biopsy
- 92nd percentile350 procedures
- Removal of skin lesions
- 81st percentile262 procedures
- Melanoma (skin cancer) excision
- 79th percentile27 procedures
- Removal or shaving of skin growth
- 65th percentile12 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)
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Dr. James Benjamin Grossweiner received $89 in industry payments from 2016 to 2023
CMS Open Payments shows 6 general payments to Dr. Grossweiner from 4 drug and device companies from 2016 to 2023. Education make up the largest share, 87% of the total. Pfizer Inc. paid the most, $46.
General payments to Dr. Grossweiner by program year, 2016 to 2023
General payments to Dr. Grossweiner by kind, 2016 to 2023
- Education$7787%
- Food and beverage$1113%
Companies that paid Dr. Grossweiner the most, 2016 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. James Benjamin Grossweiner graduated from R Franklin University of Med & Sci/Chicago Medical School
Dr. Grossweiner graduated from R Franklin University of Med & Sci/Chicago Medical School in 1985.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. James Benjamin Grossweiner'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 |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation 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 DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| 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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile 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. James Benjamin Grossweiner
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. James Benjamin Grossweiner's NPI number?
Dr. James Benjamin Grossweiner's NPI number is 1437114907. It was assigned on April 19, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. James Benjamin Grossweiner?
Dr. James Benjamin Grossweiner is a dermatologist in Naperville, Illinois. The primary specialty in the NPI Registry is Dermatology Physician (taxonomy code 207N00000X).
Where does Dr. James Benjamin Grossweiner practice?
Dr. Grossweiner practices at 1220 Hobson Rd, Naperville, IL 60540. Dr. Grossweiner's primary practice is Grossweiner & Blaszak in Naperville, Illinois. Dmand AI also links Dr. Grossweiner to 1 group practice or clinic.
What is Dr. James Benjamin Grossweiner's office phone number?
The practice phone on file for Dr. Grossweiner is (630) 355-6660.
What is Dr. James Benjamin Grossweiner's medical license number?
Dr. Grossweiner holds Illinois license 036-074040.
Which hospitals is Dr. James Benjamin Grossweiner affiliated with?
Dr. Grossweiner is affiliated with Edward Hospital.
What medical group is Dr. James Benjamin Grossweiner part of?
Dr. Grossweiner is linked to Grossweiner & Blaszak PC.
Does Dr. James Benjamin Grossweiner accept Medicare?
Yes. CMS data shows Dr. Grossweiner billed Medicare for 2,480 services in 2024, and Dr. Grossweiner accepts Medicare assignment.
What is Dr. James Benjamin Grossweiner's MIPS score?
Dr. Grossweiner's MIPS final score for performance year 2024 is 90 out of 100, reported as part of a group.
How many Medicare patients does Dr. James Benjamin Grossweiner see?
CMS counts 480 Medicare patients who saw Dr. Grossweiner in 2024, with an average age of 75.
Show 5 more questionsShow fewer questions
What services does Dr. James Benjamin Grossweiner bill to Medicare?
In 2024, Dr. Grossweiner's most billed Medicare services were surgery: skin and soft tissue (17003), office visit, established patient (99212) and office visit, established patient (99213).
Where did Dr. James Benjamin Grossweiner go to medical school?
Dr. Grossweiner graduated from R Franklin University of Med & Sci/Chicago Medical School in 1985.
What drugs does Dr. James Benjamin Grossweiner prescribe most?
In 2024 Medicare Part D data, Dr. Grossweiner's most prescribed drugs by claims were Triamcinolone Acetonide, Mometasone Furoate and Fluocinonide.
Has Dr. James Benjamin Grossweiner received payments from drug or device companies?
CMS Open Payments shows $89 in general payments to Dr. Grossweiner from 4 companies from 2016 to 2023. The largest total came from Pfizer Inc.
How long has Dr. James Benjamin Grossweiner been practicing?
Dr. Grossweiner graduated from medical school in 1985, 41 years ago.
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