Dr. Gregg E. Zimmerman, MD
- Medicare services, 2024
- 5,334
- Medicare patients, 2024
- 1,087
- Part D claims, 2024
- 1,520
- Publications
- 1
- Hospital affiliations
- 5
- Practice address
- 23 Pocono Rd, Denville, NJ 07834
- Practice phone
- Call (973) 366-6060
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Internal Medicine of Morris County
Denville, New Jersey
Find Dr. Zimmerman'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. Gregg E. Zimmerman is a urologist in Denville, New Jersey
Dr. Zimmerman practices at Internal Medicine of Morris County in Denville, New Jersey.
Dr. Zimmerman's NPI, 1790766228, was assigned on November 10, 2005. Dr. Zimmerman graduated from State University of New York at Stony Brook, School of Medicine in 2000. Dr. Zimmerman holds New Jersey license 25MA08076700.
- NPI
- 1790766228NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0941232458
- NPI enumeration date
- November 10, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (973) 366-6060
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 52
- Medical school graduation
- 2000
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gregg E. Zimmerman practices at Internal Medicine of Morris County in Denville, New Jersey
Dr. Zimmerman's primary practice is Internal Medicine of Morris County, at 23 Pocono Rd, Denville, NJ 07834 in Morris County. The practice phone is (973) 366-6060.
- Internal Medicine of Morris County23 Pocono Rd, Denville, NJ 07834 · Morris CountyPhone(973) 366-6060
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Gregg E. Zimmerman is affiliated with 10 sites of care and 4 medical groups
Dr. Zimmerman's primary practice is Internal Medicine of Morris County in Denville, New Jersey. Dr. Zimmerman is also affiliated with Saint Clare's Denville Hospital. The medical group on file is Astera Cancer Care. Dmand AI also links Dr. Zimmerman to 4 more hospitals, 3 group practices and clinics, 3 medical groups and 1 physician office, each 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. Gregg E. Zimmerman's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Zimmerman practices, 9 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Internal Medicine of Morris County | Available with a free account |
| +9 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gregg E. Zimmerman is one of 405 urologists in New Jersey
Urology is Dr. Zimmerman's primary specialty in the NPI Registry, under taxonomy code 208800000X. Dr. Zimmerman is licensed in New Jersey.
Specialties and state licenses
- Urology, New JerseyPrimary
Urologists near Dr. Zimmerman
Counts of urologists 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. Gregg E. Zimmerman billed Medicare for 5,334 services in 2024
CMS data shows 5,334 Medicare services from Dr. Zimmerman across 25 procedure codes in 2024, for 1,087 Medicare patients. Medicare paid $262,677 for them.
Dr. Zimmerman's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,9442024: 1,8654%
- Surgery
- 2023: 1,5222024: 1,5462%
- Lab and pathology
- 2023: 1,3942024: 1,3483%
- Other services
- 2023: 02024: 304
- Drugs given in the office
- 2023: 1,8812024: 11794%
- Imaging
- 2023: 662024: 8935%
- Tests and treatments
- 2023: 262024: 65150%
Where Dr. Zimmerman's Medicare services took place, 2024
- In an office5,11196%
- In a facility2234%
Dr. Zimmerman compared with the New Jersey median for urologists, 2024
- Dr. Zimmerman
- New Jersey median
- Medicare services
- 5,334vs 2,1442.5 times
- Medicare patients
- 1,087vs 56891% above
- Part D claims
- 1,387vs 1,10925% above
Medians across 388 urologists in New Jersey with Dmand AI profiles that report each measure.
Dr. Zimmerman'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. Zimmerman and other urologists in New Jersey.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gregg E. Zimmerman treated 1,087 Medicare patients in 2024, average age 75
CMS counts 1,087 Medicare patients who saw Dr. Zimmerman in 2024. The largest group is 65 to 74, with 527 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 3% are also on Medicaid. Their average risk score is 1.19, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Zimmerman's median patient age at 70, with 16% women.
Dr. Zimmerman's Medicare patients by age, 2024
Dr. Zimmerman's Medicare patients by sex, 2024
- Women19718%
- Men89082%
Chronic conditions among Dr. Zimmerman's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis43%
- Ischemic heart disease38%
- Cancer36%
- Chronic kidney disease33%
- Diabetes32%
- Atrial fibrillation21%
Share of Medicare patients with each condition. A patient can have several.
Dr. Zimmerman's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 70
Patient panel by sex, all payers
- Women16%
- Men80%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gregg E. Zimmerman wrote 1,520 Medicare Part D claims in 2024
In 2024, Dr. Zimmerman wrote 1,520 Medicare Part D claims for 503 patients. 85% of them were for generic drugs. CMS names the drug for 1,387 of them, across 19 drugs with 11 or more claims each, at $244,816 in total drug cost. In 2023, CMS named 1,234 claims across 19 drugs.
Dr. Zimmerman's Part D claims by kind of drug, 2024
- Generic1,287 claims85%
- Brand-name and other233 claims15%
Dr. Zimmerman'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. Zimmerman's Part D claims, 2024
- Opioids4%55 of 1,520 claims
- Antibiotics12%188 of 1,520 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: 1,2342024: 1,38712%
Drugs named by CMS: 19 in 2024, 19 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. Gregg E. Zimmerman ranks in the 79th percentile for prostate resection in Medicare
Dr. Zimmerman accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Zimmerman as offering telehealth. CMS counts 19 procedures of prostate resection by Dr. Zimmerman, more than 79% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Where Dr. Zimmerman ranks in Medicare procedure volume
- Prostate resection
- 79th percentile19 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Hernia repair (minimally invasive): 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Gregg E. Zimmerman has 1 publication on record
Dmand AI links 1 paper to Dr. Zimmerman in 2011. Dr. Zimmerman's most frequent co-authors are Marc D. Colton, MD and Michael Scott Ingber, MD.
Dr. Zimmerman's most frequent co-authors
Recent publications by Dr. Zimmerman
See who Dr. Zimmerman researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Zimmerman works with, so you can find a warm path to the right urologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Gregg E. Zimmerman received $12,119 in industry payments from 2016 to 2025
CMS Open Payments shows 485 general payments to Dr. Zimmerman from 70 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 94% of the total. Intuitive Surgical, Inc. paid the most, $1,069.
General payments to Dr. Zimmerman by program year, 2016 to 2025
General payments to Dr. Zimmerman by kind, 2016 to 2025
- Food and beverage$11,39994%
- Education$3373%
- Travel and lodging$3213%
- Gifts$340%
- Consulting fees$280%
Companies that paid Dr. Zimmerman the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gregg E. Zimmerman graduated from State University of New York at Stony Brook, School of Medicine
Dr. Zimmerman graduated from State University of New York at Stony Brook, School of Medicine in 2000.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Gregg E. Zimmerman'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)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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. Gregg E. Zimmerman
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. Gregg E. Zimmerman's NPI number?
Dr. Gregg E. Zimmerman's NPI number is 1790766228. It was assigned on November 10, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregg E. Zimmerman?
Dr. Gregg E. Zimmerman is a urologist in Denville, New Jersey. The primary specialty in the NPI Registry is Urology Physician (taxonomy code 208800000X).
Where does Dr. Gregg E. Zimmerman practice?
Dr. Zimmerman practices at 23 Pocono Rd, Denville, NJ 07834. Dr. Zimmerman's primary practice is Internal Medicine of Morris County in Denville, New Jersey. Dmand AI also links Dr. Zimmerman to 4 hospitals, 3 group practices and clinics, 3 medical groups and 1 physician office.
What is Dr. Gregg E. Zimmerman's office phone number?
The practice phone on file for Dr. Zimmerman is (973) 366-6060.
What is Dr. Gregg E. Zimmerman's medical license number?
Dr. Zimmerman holds New Jersey license 25MA08076700.
Which hospitals is Dr. Gregg E. Zimmerman affiliated with?
Dr. Zimmerman is affiliated with Saint Clare's Denville Hospital. Dmand AI links Dr. Zimmerman to 4 more hospitals.
What medical group is Dr. Gregg E. Zimmerman part of?
Dr. Zimmerman is linked to Astera Cancer Care. Dmand AI links Dr. Zimmerman to 3 more medical groups.
Does Dr. Gregg E. Zimmerman accept Medicare?
Yes. CMS data shows Dr. Zimmerman billed Medicare for 5,334 services in 2024, and Dr. Zimmerman accepts Medicare assignment.
Does Dr. Gregg E. Zimmerman offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Zimmerman as offering telehealth services.
How many Medicare patients does Dr. Gregg E. Zimmerman see?
CMS counts 1,087 Medicare patients who saw Dr. Zimmerman in 2024, with an average age of 75.
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What services does Dr. Gregg E. Zimmerman bill to Medicare?
In 2024, Dr. Zimmerman's most billed Medicare services were office visit, established patient (99214), lab and pathology test (81003) and surgery: urinary system (51798).
Where did Dr. Gregg E. Zimmerman go to medical school?
Dr. Zimmerman graduated from State University of New York at Stony Brook, School of Medicine in 2000.
What drugs does Dr. Gregg E. Zimmerman prescribe most?
In 2024 Medicare Part D data, Dr. Zimmerman's most prescribed drugs by claims were Tamsulosin HCl, Finasteride and Gemtesa.
Has Dr. Gregg E. Zimmerman received payments from drug or device companies?
CMS Open Payments shows $12,119 in general payments to Dr. Zimmerman from 70 companies from 2016 to 2025. The largest total came from Intuitive Surgical, Inc.
How long has Dr. Gregg E. Zimmerman been practicing?
Dr. Zimmerman graduated from medical school in 2000, 26 years ago.
Does Dr. Gregg E. Zimmerman do research?
Dmand AI links 1 publication to Dr. Zimmerman.
Who does Dr. Gregg E. Zimmerman publish with?
Dr. Zimmerman's most frequent co-authors are Marc D. Colton, MD (1 shared paper) and Michael Scott Ingber, MD (1 shared paper).
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