Gregory Zwack, MD
NPI 1104857358 · Otolaryngology Physician · Wilmington, NC
Enrolled with Medicare as Practitioner - Otolaryngology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Zwack, MD is a Otolaryngology Physician provider in Wilmington, NC (NPI 1104857358).
Provider details
- NPI number
- 1104857358
- Entity type
- Individual
- Primary specialty
- Otolaryngology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 2009-01440 (NC)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,205 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 264 | $85 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 166 | $104 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 161 | $156 |
| Removal of Impacted Ear Wax69210 | 157 | $44 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 147 | $120 |
| Diagnostic Exam of Nasal Passages Using an Endoscope31231 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 12 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ipratropium Bromide | 102 | 33 |
| Montelukast Sodium | 84 | 25 |
| Prednisone | 41 | 39 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 37 | 36 |
| Ciprofloxacin Hcl/Dexamethbrand: Ciprofloxacin-Dexamethasone | 23 | 11 |
| Mupirocin | 16 | — |
| Meclizine Hcl | 15 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$571 across 19 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-06
- Last updated
- 2019-01-31
Frequently asked questions
- What is Gregory Zwack's NPI number?
- Gregory Zwack's National Provider Identifier (NPI) is 1104857358, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Zwack's specialty?
- Gregory Zwack is listed in the NPPES registry with a primary specialty of Otolaryngology Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Zwack located?
- Gregory Zwack's practice location on file with NPPES is 6727 Parker Farm Drive, Wilmington, NC 28405.
- What is Gregory Zwack's phone number?
- The practice phone number listed in the NPPES registry for Gregory Zwack is (910) 341-3300.
- Does Gregory Zwack accept Medicare?
- Gregory Zwack is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Zwack's NPI active?
- Yes — Gregory Zwack's NPI (1104857358) is active in the NPPES registry as of the last update on 2019-01-31.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.