Ronald A. Zlotoff, M.D.
Gastroenterology Physician · Waterbury, CT
Ronald A. Zlotoff, M.D. is a gastroenterology physician with a practice address in Waterbury, Connecticut, and NPI 1346229556, issued on Jan 16, 2006. Check the license (Connecticut 20649, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Ronald A. Zlotoff
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 20649 CT
Self-reported in NPPES; status is on the state search - Practice location
- 140 Grandview Ave, Waterbury, CT 06708
- Phone
- (203) 755-4515
- Enumerated
- Jan 16, 2006
- Record last updated
- Oct 29, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (203) 755-8129
- Medicare enrollment
- Enrolled (PECOS I20031104000510); accepts Medicare assignment
- Medical or professional school
- University Of Oklahoma College Of Medicine, 1977
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 336 in Connecticut → Look up another NPI →
Also registered at 140 Grandview Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Lydia Aoun-Barakat, MDInfectious Disease Physician1033183355
- Girvice Archer, M.DAnesthesiology Physician1023058724
- Steven Aronin, MDInfectious Disease Physician1164495875
- Elisa Benzoni, DOObstetrics & Gynecology Physician1679581847
Verify Ronald A. Zlotoff in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 20649Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average gastroenterology physician in 2024
13 Medicare Part D claims, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 85% of claims.
Most prescribed
- Linzess11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Gaylord Hospital, Inc.Wallingford, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ronald A. Zlotoff among 336 gastroenterology physician records in Connecticut
Ronald A. Zlotoff, M.D. is one of 336 gastroenterology physician records with a practice address in Connecticut. 86% 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 15% of them.
- NPI issued2006 · 15% of these records are older, 49% newer
- In a Medicare fileYes · 86% of these records are
- In the CMS Doctors and Clinicians fileYes · 76% of these records are
- Graduated1977 · median 2001 among the 255 with a school on file
- Record last updated2021 · 69% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Connecticut
There are 336 gastroenterology physician records in Connecticut.
All 336 in Connecticut → Every provider in Waterbury → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Priyanka Chugh, MDWaterbury, CT 067081700147915
- Joel Garsten, M.DWaterbury, CT 067081679521363
- Robert Leventhal, MDWaterbury, CT 067081275506214
- Bhupinder Lyall, M.D.Waterbury, CT 067081104874999
- Paolo Mapelli, MDWaterbury, CT 067081790757383
- Albert Marano, MDWaterbury, CT 067081588627467
- Eduardo Mari, MDWaterbury, CT 067081063458396
- Russell Parvin, MDWaterbury, CT 067081669710414
Common questions
What is Ronald A. Zlotoff, M.D.'s NPI number?
Ronald A. Zlotoff, M.D.'s National Provider Identifier (NPI) is 1346229556, issued on Jan 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ronald A. Zlotoff, M.D. located?
The NPPES record lists a practice address at 140 Grandview Ave, Waterbury, CT, 06708. Phone: (203) 755-4515. Providers update this record themselves, so call before visiting.
How can I verify Ronald A. Zlotoff, M.D.'s license?
NPPES lists Connecticut license number 20649, 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.
How much does Ronald A. Zlotoff, M.D. prescribe under Medicare Part D?
In 2024, Ronald A. Zlotoff, M.D. had 13 Medicare Part D claims; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
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.