Gregory Zanieski, MD
Surgical Oncology Physician · New Haven, CT
Gregory Zanieski, MD is a surgical oncology physician with a practice address in New Haven, Connecticut, and NPI 1235320474, issued on Aug 5, 2007. Check the license (Connecticut 62463, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Gregory Zanieski
- Credential
- MD
- Primary taxonomy
- Surgical Oncology Physician 2086X0206X
- License numbers
- 62463 CT
256848 NY
MD432356 PA
Self-reported in NPPES; status is on the state search - Practice location
- Smilow Cancer Hospital AT Yale-New Haven, New Haven, CT 06510
- Phone
- (203) 785-3577
- Enumerated
- Aug 5, 2007
- Record last updated
- Jul 30, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (203) 737-4067
- Medicaid ID
- 03227869 NY
- Medicare enrollment
- Enrolled (PECOS I20190729003574); accepts Medicare assignment
- Medical or professional school
- State University Of New York At Stony Brook, School Of Medicine, 2002
- Entity
- Type 1 · individual
8 nearest surgical oncology physician records → All 38 in Connecticut → Look up another NPI →
Verify Gregory Zanieski in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 62463Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The practice group's MIPS final score for 2023 (Medicare payment program): 73.6 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $26.75
1 payment: food and beverage; the largest payer was Endomagnetics Ltd. The 1,132 providers of this specialty with any payment received $4,224.74 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
- Yale UniversityNew Haven, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory Zanieski among 38 surgical oncology physician records in Connecticut
Gregory Zanieski, MD is one of 38 surgical oncology physician records with a practice address in Connecticut. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 45% of them.
- NPI issued2007 · 45% of these records are older, 32% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated2002 · median 2002 among the 27 with a school on file
- Record last updated2019 · 66% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2086X0206X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Surgical Oncology Physician providers in Connecticut
There are 38 surgical oncology physician records in Connecticut.
All 38 in Connecticut → Every provider in New Haven → Surgical Oncology Physician nationwide →
The 8 surgical oncology physician records with the nearest ZIP codes
- Kevin Billingsley, MDNew Haven, CT 065101346258803
- John Kunstman, MDNew Haven, CT 065101265666184
- Tristen Park, MDNew Haven, CT 065101295062081
- Joshua Bleicher, M.D.New Haven, CT 065191871957720
- Vera Hendrix, M.D.New Haven, CT 065191225490931
- Isaac Kim, MD, PHDNew Haven, CT 065191235217985
- Sung Kwon, M.D.New Haven, CT 065191447458484
- Donald Lannin, MDNew Haven, CT 065191972587830
Common questions
What is Gregory Zanieski, MD's NPI number?
Gregory Zanieski, MD's National Provider Identifier (NPI) is 1235320474, issued on Aug 5, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Zanieski, MD located?
The NPPES record lists a practice address at Smilow Cancer Hospital AT Yale-New Haven, New Haven, CT, 06510. Phone: (203) 785-3577. Providers update this record themselves, so call before visiting.
How can I verify Gregory Zanieski, MD's license?
NPPES lists Connecticut license number 62463, as entered by the provider. Search the Connecticut Medical Examining Board at https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
What is Gregory Zanieski, MD's MIPS final score?
The 2023 MIPS final score is 73.6 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.