Gregory Charles Zwack, MD
Otolaryngology Physician · Wilmington, NC
Gregory Charles Zwack, MD is an otolaryngology physician with a practice address in Wilmington, North Carolina, and NPI 1104857358, issued on Jul 6, 2006. Check the license (North Carolina 2009-01440, as entered in NPPES) on the North Carolina Medical Board; the Medicare figures below come from public CMS files.
- Name
- Gregory Charles Zwack
- Credential
- MD
- Primary taxonomy
- Otolaryngology Physician 207Y00000X
- License number
- 2009-01440 NC
Self-reported in NPPES; status is on the state search - Practice location
- 6727 Parker Farm Drive, Wilmington, NC 28405
- Phone
- (910) 341-3300
- Enumerated
- Jul 6, 2006
- Record last updated
- Jan 31, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (910) 251-2067
- Medicare enrollment
- Enrolled (PECOS I20090917000565); accepts Medicare assignment
- Medical or professional school
- Jefferson Medical College Of Thomas Jefferson University, 1992
- Entity
- Type 1 · individual
8 nearest otolaryngology physician records → All 403 in North Carolina → Look up another NPI →
Also registered at 6727 Parker Farm Drive
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Gregory Charles Zwack in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNorth Carolina Medical Board
Search for license 2009-01440Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
8% fewer Medicare Part D claims than the average otolaryngology physician in 2024
497 Medicare Part D claims for 199 beneficiaries, against an average of 541 among the 8,339 providers of this specialty who prescribed in Part D. 38 claims were for opioids.
Most prescribed
- Ipratropium Bromide102 claims
- Montelukast Sodium84 claims
- Prednisone41 claims
- Hydrocodone-Acetaminophen37 claims
- Ciprofloxacin-Dexamethasone23 claims
- Mupirocin16 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.
Industry payments in 2024: $571.12
19 payments; by number, the most common kind was food and beverage; the largest payer was GlaxoSmithKline, LLC. The 6,429 providers of this specialty with any payment received $1,922.50 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Wilmington Health PLLCJacksonville, NC
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory Charles Zwack among 403 otolaryngology physician records in North Carolina
Gregory Charles Zwack, MD is one of 403 otolaryngology physician records with a practice address in North Carolina. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 11% of them.
- NPI issued2006 · 11% of these records are older, 45% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 67% of these records are
- Graduated1992 · median 2002 among the 269 with a school on file
- Record last updated2019 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Y00000X and a North Carolina practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Otolaryngology Physician providers in North Carolina
There are 403 otolaryngology physician records in North Carolina.
All 403 in North Carolina → Every provider in Wilmington → Otolaryngology Physician nationwide →
The 8 otolaryngology physician records with the nearest ZIP codes
- John Boyle, MDWilmington, NC 284051104357706
- George Brinson, M.D.Wilmington, NC 284031861454399
- Robert Fulk, M.D.Wilmington, NC 284031972830545
- Stuart Hardy, M.D.Wilmington, NC 284031386608495
- Edmund Haywood, MDWilmington, NC 284031427492230
- J McMurry, M.D.Wilmington, NC 284031366403826
- Joel Oubre, MDWilmington, NC 284031023638103
- John Roche, M.D.Wilmington, NC 284031205837689
Common questions
What is Gregory Charles Zwack, MD's NPI number?
Gregory Charles Zwack, MD's National Provider Identifier (NPI) is 1104857358, issued on Jul 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Charles Zwack, MD located?
The NPPES record lists a practice address at 6727 Parker Farm Drive, Wilmington, NC, 28405. Phone: (910) 341-3300. Providers update this record themselves, so call before visiting.
How can I verify Gregory Charles Zwack, MD's license?
NPPES lists North Carolina license number 2009-01440, as entered by the provider. Search the North Carolina Medical Board at https://portal.ncmedboard.org/verification/search.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gregory Charles Zwack, MD prescribe under Medicare Part D?
In 2024, Gregory Charles Zwack, MD had 497 Medicare Part D claims for 199 beneficiaries; the average among otolaryngology physician prescribers was 541. 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.