Cathy J. Zack, MD
Family Medicine Physician · East Hampton, CT
Cathy J. Zack, MD is a family medicine physician with a practice address in East Hampton, Connecticut, and NPI 1003828435, issued on Aug 13, 2006. Check the license (Connecticut 030910, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Cathy J. Zack
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License numbers
- 030910 CT
30910 CT
Self-reported in NPPES; status is on the state search - Practice location
- 120 Main St, East Hampton, CT 06424
- Phone
- (860) 267-2593
- Enumerated
- Aug 13, 2006
- Record last updated
- May 4, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (860) 267-4889
- Medicare enrollment
- Enrolled (PECOS I20040316000025); accepts Medicare assignment
- Medical or professional school
- Geisel School Of Medicine At Dartmouth, 1988
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 958 in Connecticut → Look up another NPI →
Verify Cathy J. Zack in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 030910Check 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 MIPS final score for 2023 (Medicare payment program): 97.3 of 100
The Merit-based Incentive Payment System score is reported for this clinician. 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; category weights for 2023 (qpp.cms.gov).
One hospital affiliation
- Middlesex HospitalMiddletown, CT · Acute Care Hospitals3 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Cathy J. Zack among 958 family medicine physician records in Connecticut
Cathy J. Zack, MD is one of 958 family medicine physician records with a practice address in Connecticut. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 57% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 64% of these records are
- Graduated1988 · median 2009 among the 611 with a school on file
- Record last updated2017 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
3 family medicine physician records list a practice address in East Hampton
They are 3 of the 90 NPPES records with a practice address in East Hampton, and 958 family medicine physician records in Connecticut.
All 958 in Connecticut → Every provider in East Hampton → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Domenic Casablanca, M.D.East Hampton, CT 064241548227267
- Ana Garcia, D.O.East Hampton, CT 064241710418249
- Michael Baldwin, DOEssex, CT 064261104895382
- Theodore Bruno, MDDurham, CT 064221174068803
- John Carbone, MDDurham, CT 064221366487563
- Nazmiye Hatiboglu, MDDurham, CT 064221225266547
- Louise Maloney, MDEssex, CT 064261801825799
- Thomas McDowell, MDEssex, CT 064261275015141
Common questions
What is Cathy J. Zack, MD's NPI number?
Cathy J. Zack, MD's National Provider Identifier (NPI) is 1003828435, issued on Aug 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Cathy J. Zack, MD located?
The NPPES record lists a practice address at 120 Main St, East Hampton, CT, 06424. Phone: (860) 267-2593. Providers update this record themselves, so call before visiting.
How can I verify Cathy J. Zack, MD's license?
NPPES lists Connecticut license number 030910, 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 Cathy J. Zack, MD's MIPS final score?
The 2023 MIPS final score is 97.3 of 100. 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.