Mark Nicholson Gilroy, D.O.
Pediatrics Physician · Unionville, CT
Mark Nicholson Gilroy, D.O. is a pediatrics physician with a practice address in Unionville, Connecticut, and NPI 1225370349, issued on Mar 27, 2013. Check the license (Connecticut 55457, as entered in NPPES) on the Connecticut Medical Examining Board; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Mark Nicholson Gilroy
- Credential
- D.O.
- Primary taxonomy
- Pediatrics Physician 208000000X
- License number
- 55457 CT
Self-reported in NPPES; status is on the state search - Practice location
- 101 Main St, Unionville, CT 06085
- Phone
- (860) 673-6124
- Enumerated
- Mar 27, 2013
- Record last updated
- Dec 19, 2019 (not updated in 7 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
Also registered at 101 Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Peter Jannuzzi, MDPediatrics Physician1962572677
- Mitra Kabakoff, D.D.S.Pediatric Dentistry1336271030
- Kevin Maltz, D.D.S.Pediatric Dentistry1659403251
- Frederick O'Connor, MDPediatrics Physician1982774618
- Jenny Petrauskas, M.D.Pediatrics Physician1043605231
- Julia Ryan, MD, PHDPediatrics Physician1437619384
Verify Mark Nicholson Gilroy in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 55457Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
6 pediatrics physician records list a practice address in Unionville
They are 6 of the 46 NPPES records with a practice address in Unionville, and 1,043 pediatrics physician records in Connecticut. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 6 in Unionville → All 1,043 in Connecticut → Every provider in Unionville →
Other pediatrics physician records in Connecticut
- Sobia Aamir, MDHartford, CT1245998475
- Nada Abdel A'Al, M.D.Trumbull, CT1679586580
- Sakena Abedin, M.D.Hamden, CT1891949954
- Matthew Abel, MEDICAL DOCTORNew Milford, CT1538166806
- Suja Abraham, MDStamford, CT1568537090
- Robin Abramowicz, M.D.Westport, CT1346383023
- Nicole Abramowitz, MDWestport, CT1245243922
- Carnie Acier, MDNew Haven, CT1881331031
- Robert Adamenko, MDGlastonbury, CT1629040100
- Susan Adeife Lee, MDBristol, CT1528120094
Common questions
What is Mark Nicholson Gilroy, D.O.'s NPI number?
Mark Nicholson Gilroy, D.O.'s National Provider Identifier (NPI) is 1225370349, issued on Mar 27, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Mark Nicholson Gilroy, D.O. located?
The NPPES record lists a practice address at 101 Main St, Unionville, CT, 06085. Phone: (860) 673-6124. Providers update this record themselves, so call before visiting.
How can I verify Mark Nicholson Gilroy, D.O.'s license?
NPPES lists Connecticut license number 55457, 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.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. 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.