Dr. Gregory Charles Zwack, MD
- Medicare services, 2024
- 1,205
- Medicare patients, 2024
- 656
- Part D claims, 2024
- 497
- Hospital affiliations
- 1
- Industry payments
- $4,095
- Practice address
- 1202 Medical Center Dr, Wilmington, NC 28401
- Practice phone
- Call (910) 341-3300
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Wilmington Health
Wilmington, North Carolina
Find Dr. Zwack'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. Gregory Charles Zwack is an otolaryngologist in Wilmington, North Carolina
Dr. Zwack practices at Wilmington Health in Wilmington, North Carolina.
Dr. Zwack's NPI, 1104857358, was assigned on July 6, 2006. Dr. Zwack graduated from Jefferson Medical College of Thomas Jefferson University in 1992. Dr. Zwack holds North Carolina license 2009-01440.
- NPI
- 1104857358NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0840198305
- NPI enumeration date
- July 6, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (910) 341-3300
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 60
- Medical school graduation
- 1992
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gregory Charles Zwack practices at Wilmington Health in Wilmington, North Carolina
Dr. Zwack's primary practice is Wilmington Health, at 1202 Medical Center Dr, Wilmington, NC 28401 in New Hanover County. The practice phone is (910) 341-3300.
- Wilmington Health1202 Medical Center Dr, Wilmington, NC 28401 · New Hanover CountyPhone(910) 341-3300
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Gregory Charles Zwack is affiliated with 3 sites of care and 1 medical group
Dr. Zwack's primary practice is Wilmington Health in Wilmington, North Carolina. Dr. Zwack is also affiliated with Novant Health New Hanover Regional Medical Center. The medical group on file is Wilmington Health. Dmand AI also links Dr. Zwack 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. Gregory Charles Zwack's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Zwack practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Wilmington Health | 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. Gregory Charles Zwack is one of 342 otolaryngologists in North Carolina
Otolaryngology is Dr. Zwack's primary specialty in the NPI Registry, under taxonomy code 207Y00000X. Dr. Zwack is licensed in North Carolina.
Specialties and state licenses
- Otolaryngology, North CarolinaPrimary
Otolaryngologists near Dr. Zwack
Counts of otolaryngologists 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. Gregory Charles Zwack billed Medicare for 1,205 services in 2024
CMS data shows 1,205 Medicare services from Dr. Zwack across 14 procedure codes in 2024, for 656 Medicare patients. Medicare paid $88,152 for them.
Dr. Zwack's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 8472024: 7877%
- Surgery
- 2023: 3462024: 3305%
- Tests and treatments
- 2023: 812024: 7310%
- Other services
- 2023: 202024: 1525%
Where Dr. Zwack's Medicare services took place, 2024
- In an office1,19399%
- In a facility121%
Dr. Zwack compared with the North Carolina median for otolaryngologists, 2024
- Dr. Zwack
- North Carolina median
- Medicare services
- 1,205vs 62892% above
- Medicare patients
- 656vs 2862.3 times
- Part D claims
- 380vs 25450% above
Medians across 333 otolaryngologists in North Carolina with Dmand AI profiles that report each measure.
Dr. Zwack'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.
Need commercial claims for Dr. Zwack?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Zwack and other otolaryngologists in North Carolina.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gregory Charles Zwack treated 656 Medicare patients in 2024, average age 74
CMS counts 656 Medicare patients who saw Dr. Zwack in 2024. The largest group is 65 to 74, with 322 patients. 75% of them have high cholesterol, and 74% have high blood pressure. 6% are also on Medicaid. Their average risk score is 1.21, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Zwack's median patient age at 64, with 53% women.
Dr. Zwack's Medicare patients by age, 2024
Dr. Zwack's Medicare patients by sex, 2024
- Women33050%
- Men32650%
Chronic conditions among Dr. Zwack's Medicare patients, 2024
- High cholesterol75%
- High blood pressure74%
- Arthritis46%
- Diabetes32%
- Ischemic heart disease29%
- Mood disorders29%
- Depression27%
- Anxiety26%
Share of Medicare patients with each condition. A patient can have several.
Dr. Zwack's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 64
Patient panel by sex, all payers
- Women53%
- Men46%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gregory Charles Zwack wrote 497 Medicare Part D claims in 2024
In 2024, Dr. Zwack wrote 497 Medicare Part D claims for 199 patients. 89% of them were for generic drugs. CMS names the drug for 380 of them, across 12 drugs with 11 or more claims each, at $58,069 in total drug cost. In 2023, CMS named 298 claims across 12 drugs.
Dr. Zwack's Part D claims by kind of drug, 2024
- Generic443 claims89%
- Brand-name and other54 claims11%
Dr. Zwack'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. Zwack's Part D claims, 2024
- Opioids8%38 of 497 claims
- Antibiotics7%35 of 497 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: 2982024: 38028%
Drugs named by CMS: 12 in 2024, 12 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
How Dr. Gregory Charles Zwack takes part in Medicare
Dr. Zwack accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Gregory Charles Zwack received $4,095 in industry payments from 2016 to 2025
CMS Open Payments shows 122 general payments to Dr. Zwack from 33 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 73% of the total. Medtronic, Inc. paid the most, $1,213.
General payments to Dr. Zwack by program year, 2016 to 2025
General payments to Dr. Zwack by kind, 2016 to 2025
- Food and beverage$2,99973%
- Travel and lodging$88122%
- Speaker and faculty fees$1654%
- Education$501%
Companies that paid Dr. Zwack 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. Gregory Charles Zwack graduated from Jefferson Medical College of Thomas Jefferson University
Dr. Zwack graduated from Jefferson Medical College of Thomas Jefferson University in 1992.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Gregory Charles Zwack'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) |
| 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. Gregory Charles Zwack
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. Gregory Charles Zwack's NPI number?
Dr. Gregory Charles Zwack's NPI number is 1104857358. It was assigned on July 6, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory Charles Zwack?
Dr. Gregory Charles Zwack is an otolaryngologist in Wilmington, North Carolina. The primary specialty in the NPI Registry is Otolaryngology Physician (taxonomy code 207Y00000X).
Where does Dr. Gregory Charles Zwack practice?
Dr. Zwack practices at 1202 Medical Center Dr, Wilmington, NC 28401. Dr. Zwack's primary practice is Wilmington Health in Wilmington, North Carolina. Dmand AI also links Dr. Zwack to 1 group practice or clinic.
What is Dr. Gregory Charles Zwack's office phone number?
The practice phone on file for Dr. Zwack is (910) 341-3300.
What is Dr. Gregory Charles Zwack's medical license number?
Dr. Zwack holds North Carolina license 2009-01440.
Which hospitals is Dr. Gregory Charles Zwack affiliated with?
Dr. Zwack is affiliated with Novant Health New Hanover Regional Medical Center.
What medical group is Dr. Gregory Charles Zwack part of?
Dr. Zwack is linked to Wilmington Health.
Does Dr. Gregory Charles Zwack accept Medicare?
Yes. CMS data shows Dr. Zwack billed Medicare for 1,205 services in 2024, and Dr. Zwack accepts Medicare assignment.
How many Medicare patients does Dr. Gregory Charles Zwack see?
CMS counts 656 Medicare patients who saw Dr. Zwack in 2024, with an average age of 74.
What services does Dr. Gregory Charles Zwack bill to Medicare?
In 2024, Dr. Zwack's most billed Medicare services were office visit, established patient (99213), office visit, new patient (99203) and office visit, new patient (99204).
Show 4 more questionsShow fewer questions
Where did Dr. Gregory Charles Zwack go to medical school?
Dr. Zwack graduated from Jefferson Medical College of Thomas Jefferson University in 1992.
What drugs does Dr. Gregory Charles Zwack prescribe most?
In 2024 Medicare Part D data, Dr. Zwack's most prescribed drugs by claims were Ipratropium Bromide, Montelukast Sodium and Prednisone.
Has Dr. Gregory Charles Zwack received payments from drug or device companies?
CMS Open Payments shows $4,095 in general payments to Dr. Zwack from 33 companies from 2016 to 2025. The largest total came from Medtronic, Inc.
How long has Dr. Gregory Charles Zwack been practicing?
Dr. Zwack graduated from medical school in 1992, 34 years ago.
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