Gregory Zanieski, MD
General Surgery · Surgical Oncology (CMS) · New Haven, CT
At a glance
Smilow Cancer Hospital At Yale-New Haven, New Haven, CT 06510
Published activity: Mastectomy. View counts and coverage
NPPES record updated Jul 30, 2019. Public records can lag behind changes at a practice.
Before you call: a quick checklist
- Are you accepting new patients?
- Do you accept my specific insurance plan?
- Do you provide the service I need at this address?
- Do I need a referral, and what is the earliest appointment?
Insurance participation and appointment availability are not established by these public records.
Medicare & insurance
Insurance participation is not established by these public records. Ask the practice and your insurer about your specific plan and this location.
How to check your coverage
Use your plan’s provider directory or the member-services number on your insurance card. Confirm the clinician, practice address, service, and whether a referral is required. A missing opt-out record does not establish Medicare acceptance.
Check the official Medicare directory ↗Practice location
Smilow Cancer Hospital At Yale-New Haven 35 Park Street, 8Th Floor ClinicNew Haven, CT 06510
Education & affiliations
- Medical / professional school
- State University Of New York At Stony Brook, School Of Medicine
- Graduation year
- 2002
- CMS specialties
- General Surgery · Surgical Oncology
Practice groups
Reported hospital affiliations
- Lawrence & Memorial Hospital New London, CT
- Yale-New Haven Hospital New Haven, CT
Graduation year does not establish years in practice. A reported affiliation does not establish employment, current admitting privileges, or insurance participation.
Source: CMS National Downloadable File · Published Oct 15, 2026.
Source: CMS Facility Affiliation Data · Published Oct 15, 2026.
Procedures in the public data
Reported activity can help you ask more informed questions about a practice’s services.
| Procedure category | Published Medicare activity |
|---|---|
| Mastectomy | 28 |
CMS uses a one-year claims window with a reporting lag. Counts cover the Medicare activity included by CMS, not all patients. “1–10” is a published range. Volume is not a quality or outcomes score. Coverage and methodology
Source: CMS Utilization Data · Published Oct 15, 2026.
Find providers with a similar service mix
Compare 2024 published Medicare activity in the same reported specialty, here or in another city.
Industry-reported general payments
No matching general-payment summary in the imported release. This is not a verified zero and does not rule out other payment types or years.
Source: CMS 2025 payments grouped by covered recipient and nature of payments · Published Jun 30, 2026.
Professional details: NPI, taxonomy & registry record
Registry details
- Primary taxonomy
- General Surgery · Surgical Oncology (CMS)
- Taxonomy code
- 2086X0206X
- Enumeration date
- Aug 5, 2007
- Record updated
- Jul 30, 2019
More registry details
- Provider type
- Individual · Type 1
- Reported credentials
- MD
Reported taxonomies and licenses
208600000X
License reported: 256848 NY
208600000X
License reported: MD432356 PA
2086X0206X
License reported: 256848 NY
2086X0206X
License reported: MD432356 PA
2086X0206X · Primary
License reported: 62463 CT
License numbers and credentials are reported to NPPES; HCPList does not independently verify them.
Practice location
Smilow Cancer Hospital At Yale-New Haven35 Park Street, 8Th Floor Clinic
New Haven, CT 06510
- Phone
- (203) 785-3577
- Fax
- (203) 737-4067
Mailing address
P.O. BOX 208062, 330 CEDAR ST, FMB130DEPARTMENT OF SURGERY, SECTION OF SURGICAL ONCOLOGY
NEW HAVEN, CT 06520
Information may be outdated or incomplete. Confirm details directly with the practice. HCPList is an independent directory and is not affiliated with CMS.
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