Thomas Robert Mercier, MD
Pediatrics Physician · Mattituck, NY
Thomas Robert Mercier, MD is a pediatrics physician with a practice address in Mattituck, New York, and NPI 1467539023, issued on Nov 1, 2006. Check the license (New York 134761, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Thomas Robert Mercier
- Credential
- MD
- Primary taxonomy
- Pediatrics Physician 208000000X
- License number
- 134761 NY
Self-reported in NPPES; status is on the state search - Practice location
- 1045 Love Lane, Mattituck, NY 11952
- Phone
- (631) 298-5454
- Enumerated
- Nov 1, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (631) 298-5452
- Medicaid ID
- 00589693 NY
- Entity
- Type 1 · individual
8 nearest pediatrics physician records → All 5,795 in New York → Look up another NPI →
Verify Thomas Robert Mercier in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
Search for license 134761Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average pediatrics physician in 2024
32 Medicare Part D claims, against an average of 375 among the 5,609 providers of this specialty who prescribed in Part D.
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.
Thomas Robert Mercier among 5,795 pediatrics physician records in New York
Thomas Robert Mercier, MD is one of 5,795 pediatrics physician records with a practice address in New York. 36% 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, 51% newer
- In a Medicare fileYes · 36% of these records are
- In the CMS Doctors and Clinicians fileNo · 8% of these records are
- Record last updated2007 · 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 208000000X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Pediatrics Physician providers in New York
There are 5,795 pediatrics physician records in New York.
All 5,795 in New York → Every provider in Mattituck → Pediatrics Physician nationwide →
The 8 pediatrics physician records with the nearest ZIP codes
- Farzana Ahsan, M.D.Mastic, NY 119501346230430
- Tatiana Erdely, M.D.Mastic, NY 119501598755860
- Robert Rubin, D.O.Manorville, NY 119491821282054
- Briana Cohen, MDHampton Bays, NY 119461437809027
- Barbara Cusumano, MDHampton Bays, NY 119461023172418
- Robert Gottlieb, MDHampton Bays, NY 119461154489847
- Alexandra Halitsky, MDHampton Bays, NY 119461962589960
- Linda Hamilton, ARNPHampton Bays, NY 119461518044510
Common questions
What is Thomas Robert Mercier, MD's NPI number?
Thomas Robert Mercier, MD's National Provider Identifier (NPI) is 1467539023, issued on Nov 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Thomas Robert Mercier, MD located?
The NPPES record lists a practice address at 1045 Love Lane, Mattituck, NY, 11952. Phone: (631) 298-5454. Providers update this record themselves, so call before visiting.
How can I verify Thomas Robert Mercier, MD's license?
NPPES lists New York license number 134761, as entered by the provider. Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Thomas Robert Mercier, MD prescribe under Medicare Part D?
In 2024, Thomas Robert Mercier, MD had 32 Medicare Part D claims; the average among pediatrics physician prescribers was 375. 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.