Giac Chan Nguyen Tan, M.D.
Internal Medicine Physician · Waterbury, CT
Giac Chan Nguyen Tan, M.D. is an internal medicine physician with a practice address in Waterbury, Connecticut, and NPI 1962585042, issued on Oct 23, 2006. Check the license (Connecticut 028148, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Giac Chan Nguyen Tan
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 028148 CT
Self-reported in NPPES; status is on the state search - Practice location
- 171 Grandview Ave, Waterbury, CT 06708
- Phone
- (203) 694-8200
- Enumerated
- Oct 23, 2006
- Record last updated
- Feb 16, 2022
- Medicare enrollment
- Enrolled (PECOS I20110420000589); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,623 in Connecticut → Look up another NPI →
Also registered at 171 Grandview Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Kimberely Casagni, A.P.R.N.-FNPFamily Nurse Practitioner1427158781
- Lance Eriksen, MDDermatology Physician1891898821
- Victor Gotay, MDOtolaryngology Physician1417952110
- Ihsan Jabbour, M.D.General Practice Physician1407899610
Verify Giac Chan Nguyen Tan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 028148Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
78% fewer Medicare Part D claims than the average internal medicine physician in 2024
702 Medicare Part D claims for 416 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 29 claims were for opioids.
Most prescribed
- Prednisone177 claims
- Doxycycline Hyclate109 claims
- Amoxicillin-Clavulanate Potass43 claims
- Ibuprofen36 claims
- Nitrofurantoin Mono-Macro32 claims
- Betamethasone Dipropionate27 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 92.6 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).
One hospital affiliation
- Midstate Medical CenterMeriden, CT · Acute Care Hospitals4 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.
Giac Chan Nguyen Tan among 2,623 internal medicine physician records in Connecticut
Giac Chan Nguyen Tan, M.D. is one of 2,623 internal medicine physician records with a practice address in Connecticut. 81% 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 11% of them.
- NPI issued2006 · 11% of these records are older, 52% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1984 · median 2004 among the 1,646 with a school on file
- Record last updated2022 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
119 internal medicine physician records list a practice address in Waterbury
They are 119 of the 3,148 NPPES records with a practice address in Waterbury, and 2,623 internal medicine physician records in Connecticut.
All 2,623 in Connecticut → Every provider in Waterbury → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Ionut Anton, MDWaterbury, CT 067081770550238
- Kevin Carr, MDWaterbury, CT 067081356316061
- Deborah Casey, MDWaterbury, CT 067081740253632
- Shiven Chabria, MDWaterbury, CT 067081932172830
- Dragoslav Drca, M.D.Waterbury, CT 067081700820008
- Yvette Fernandez, MDWaterbury, CT 067081114968302
- Thomas Gniadek, M.D.Waterbury, CT 067081972591931
- Fausto Lanao, MDWaterbury, CT 067081801844675
Common questions
What is Giac Chan Nguyen Tan, M.D.'s NPI number?
Giac Chan Nguyen Tan, M.D.'s National Provider Identifier (NPI) is 1962585042, issued on Oct 23, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Giac Chan Nguyen Tan, M.D. located?
The NPPES record lists a practice address at 171 Grandview Ave, Waterbury, CT, 06708. Phone: (203) 694-8200. Providers update this record themselves, so call before visiting.
How can I verify Giac Chan Nguyen Tan, M.D.'s license?
NPPES lists Connecticut license number 028148, 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 Giac Chan Nguyen Tan, M.D. prescribe under Medicare Part D?
In 2024, Giac Chan Nguyen Tan, M.D. had 702 Medicare Part D claims for 416 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Giac Chan Nguyen Tan, M.D.'s MIPS final score?
The 2023 MIPS final score is 92.6 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.