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 · 2024

Total received

$571

Payment records

By payment type

Food and Beverage$521

Education$50

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