What is Gregory Zwack's specialty?

Gregory Zwack (NPI 1104857358) is a Medicare-billing provider whose primary specialty is Otolaryngology in Wilmington, NC.

Where does Gregory Zwack practice?

Gregory Zwack practices in Wilmington, NC, based on the location reported in the CMS Medicare provider datasets for NPI 1104857358.

How much does Medicare pay Gregory Zwack?

Gregory Zwack (NPI 1104857358) received approximately $131K in total Medicare Part B payments, serving 656 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1104857358

Gregory ZwackMD

OtolaryngologyWilmington, NCI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

1,056

Unique beneficiaries

—

Total services

1,205

Distinct HCPCS

Medicare payment

$88K

Peer benchmark

Total Medicare services vs. 293 Otolaryngology providers in NC — top quintile (cohort median 1,048).

PRESCRIBING · PART D · 2024

Total Rx claims

380

Beneficiaries

—

Total drug cost

$58K

Distinct drugs

Brand share

19.5%

Top prescribed drugs

Ipratropium Bromide102 claims

Montelukast Sodium84 claims

Prednisone41 claims

Hydrocodone/Acetaminophen37 claims

Ciprofloxacin Hcl/Dexameth23 claims

QUALITY · MIPS · 2024

No data available for this provider in 2024.

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2025

Total received

$272

Payment records

By payment type

Food and Beverage$272

Top paying entities

Food and Beverage$272

FACILITY AFFILIATIONS

Hospital & Facility Affiliations (1)

CCN 340141

Hospital

REFERRAL NETWORK

Where Gregory Zwack's patients come from & go

Directional shared-patient flow from Medicare claims — who sends patients to this provider (inbound) and where this provider's patients go next (outbound). 12 inbound referrers · 33 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
SOLSTAS LAB PARTNERS GROUP LLC	50	94
Michael Parker Otolaryngology · Wilmington, NC	22	150
Sandip Patel Diagnostic Radiology · Wilmington, NC	20	27
Catherine Daum Internal Medicine · Wilmington, NC	19	35
Brian Webster Internal Medicine · Wilmington, NC	19	58
Michael Mcwilliams Internal Medicine · Wilmington, NC	17	30
Stuart Point Diagnostic Radiology · Wilmington, NC	15	21
John Parker Endocrinology · Wilmington, NC	14	36
Coastal Carolina Pathology, Pa Clinical Laboratory · Wilmington, NC	14	25
Craig Webb Physician Assistant · Wilmington, NC	12	20
Paul Kamitsuka Infectious Disease · Wilmington, NC	12	26
Laura Tanner Dermatology · Wilmington, NC	11	12

Refers patients to

Outbound — where patients go next

Physician	Patients	Visits
PARKER, AIMEE	179	211
NEW HANOVER REGIONAL MEDICAL CENTER	134	301
David Gagliardi Audiologist · Wilmington, NC	88	107
Laboratory Corporation Of America Holdings Clinical Laboratory · Burlington, NC	70	135
SOLSTAS LAB PARTNERS GROUP LLC	45	92
Michael Parker Otolaryngology · Wilmington, NC	23	172
ONSLOW MEMORIAL HOSPITAL INC	21	48
Stuart Point Diagnostic Radiology · Wilmington, NC	20	33
John Remington Diagnostic Radiology · Wilmington, NC	20	43
WARREN, LEWIS	18	28
John Pasquariello Internal Medicine · Wilmington, NC	17	61
Michael Fisher Diagnostic Radiology · Wilmington, NC	16	24

Source: CMS Physician Shared Patient Patterns (30-day window, Medicare FFS). Direction = a beneficiary seen by the first provider, then the second, within 30 days; a proxy for referral, not a documented referral. Pairs with fewer than 11 shared beneficiaries are suppressed.

CROSS-REFERENCE

Related data on other Healthparse brands

ProviderScore

OIG/SAM exclusion screening, sanctions history

Healthparse Signals

Monitor this provider for changes — dated NPI change events