Nelson Tan Chao, M.D.
Internal Medicine Physician · Shelton, CT
Nelson Tan Chao, M.D. is an internal medicine physician with a practice address in Shelton, Connecticut, and NPI 1619974896, issued on Jul 4, 2005. Check the license (Connecticut 032857, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Nelson Tan Chao
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 032857 CT
Self-reported in NPPES; status is on the state search - Practice location
- 4 Corporate Dr, Shelton, CT 06484
- Phone
- (203) 402-0377
- Enumerated
- Jul 4, 2005
- Record last updated
- Apr 24, 2024
- Fax
- (203) 402-0772
- Medicare enrollment
- Enrolled (PECOS I20050110000056); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,623 in Connecticut → Look up another NPI →
Also registered at 4 Corporate Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Oluwaseun Adekanye, M.D.Pediatrics Physician1578843116
- Piotr Baginski, MDInternal Medicine Physician1164449906
- Grace Bandow, M.D.Dermatology Physician1871709147
- Jessica Bursell, PA-CPhysician Assistant1073848495
- Julie Cantatore-Francis, MDPediatric Dermatology Physician1235334913
- Richard Carroll, M.D.Pediatrics Physician1922011766
Verify Nelson Tan Chao in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 032857Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
68% more Medicare Part D claims than the average internal medicine physician in 2024
5,321 Medicare Part D claims for 463 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Amlodipine Besylate442 claims
- Losartan Potassium391 claims
- Rosuvastatin Calcium241 claims
- Levothyroxine Sodium231 claims
- Trelegy Ellipta226 claims
- Atorvastatin Calcium191 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 MIPS final score for 2023 (Medicare payment program): 81.2 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).
Industry payments in 2024: $20.42
1 payment: food and beverage; the largest payer was GlaxoSmithKline, LLC. The 50,334 providers of this specialty with any payment received $1,303.06 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.
Nelson Tan Chao among 2,623 internal medicine physician records in Connecticut
Nelson Tan Chao, 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 89% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1982 · median 2004 among the 1,646 with a school on file
- Record last updated2024 · 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).
10 internal medicine physician records list a practice address in Shelton
They are 10 of the 811 NPPES records with a practice address in Shelton, and 2,623 internal medicine physician records in Connecticut.
All 2,623 in Connecticut → Every provider in Shelton → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Bardia Asgari, MDShelton, CT 064841811938533
- Ana Graciela Azueta-Jimenez, MDShelton, CT 064841083293518
- Piotr Baginski, MDShelton, CT 064841164449906
- Nami Bayan, MDShelton, CT 064841760413538
- John Farens, MDShelton, CT 064841427133354
- Shaun Najarian, DOShelton, CT 064841568824589
- Michael Naso, M.D.Shelton, CT 064841538423488
- Lenore Snowden Opalak, M.D.Shelton, CT 064841033163605
Common questions
What is Nelson Tan Chao, M.D.'s NPI number?
Nelson Tan Chao, M.D.'s National Provider Identifier (NPI) is 1619974896, issued on Jul 4, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Nelson Tan Chao, M.D. located?
The NPPES record lists a practice address at 4 Corporate Dr, Shelton, CT, 06484. Phone: (203) 402-0377. Providers update this record themselves, so call before visiting.
How can I verify Nelson Tan Chao, M.D.'s license?
NPPES lists Connecticut license number 032857, 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 Nelson Tan Chao, M.D. prescribe under Medicare Part D?
In 2024, Nelson Tan Chao, M.D. had 5,321 Medicare Part D claims for 463 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Nelson Tan Chao, M.D.'s MIPS final score?
The 2023 MIPS final score is 81.2 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.