Leroy Stewart Thomson, M.D.
Anesthesiology Physician · Barrington, IL
Leroy Stewart Thomson, M.D. is an anesthesiology physician with a practice address in Barrington, Illinois, and NPI 1477651750, issued on Sep 20, 2006. Check the license (Illinois 036.119201, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Leroy Stewart Thomson
- Credential
- M.D.
- Primary taxonomy
- Anesthesiology Physician 207L00000X
- License numbers
- 036.119201 IL
35844 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 450 W IL Route 22, Barrington, IL 60010
- Phone
- (224) 465-3288
- Enumerated
- Sep 20, 2006
- Record last updated
- Dec 20, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20071219000745); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest anesthesiology physician records → All 2,575 in Illinois → Look up another NPI →
Also registered at 450 W IL Route 22
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Kelly HoskingPhysical Therapist1790978468
- Leo Kelly, M.D.Internal Medicine Physician1386704666
- Catherine Montalbano, MDDiagnostic Radiology Physician1285652636
Verify Leroy Stewart Thomson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036.119201Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Barrington Anesthesia Associates, SCBarrington, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Leroy Stewart Thomson among 2,575 anesthesiology physician records in Illinois
Leroy Stewart Thomson, M.D. is one of 2,575 anesthesiology physician records with a practice address in Illinois. 71% 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 6% of them.
- NPI issued2006 · 6% of these records are older, 61% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2002 · median 2006 among the 1,608 with a school on file
- Record last updated2021 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207L00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
21 anesthesiology physician records list a practice address in Barrington
They are 21 of the 756 NPPES records with a practice address in Barrington, and 2,575 anesthesiology physician records in Illinois.
All 2,575 in Illinois → Every provider in Barrington → Anesthesiology Physician nationwide →
The 8 anesthesiology physician records with the nearest ZIP codes
- Eric Bessonny, M.D.Barrington, IL 600101336147156
- Amy Chhadia, M.D.Barrington, IL 600101649332586
- J. Feldman, M.D.Barrington, IL 600101306845169
- Michael Fox, M.D.Barrington, IL 600101104825967
- Mary Fugina, M.D. S.C.Barrington, IL 600101447259205
- Prabhakar Gupta GarlaBarrington Hills, IL 600101134288483
- Yaung Kim, M.D.Barrington, IL 600101114926862
- Paul Kuo, M.D.Barrington, IL 600101316140452
Common questions
What is Leroy Stewart Thomson, M.D.'s NPI number?
Leroy Stewart Thomson, M.D.'s National Provider Identifier (NPI) is 1477651750, issued on Sep 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Leroy Stewart Thomson, M.D. located?
The NPPES record lists a practice address at 450 W IL Route 22, Barrington, IL, 60010. Phone: (224) 465-3288. Providers update this record themselves, so call before visiting.
How can I verify Leroy Stewart Thomson, M.D.'s license?
NPPES lists Illinois license number 036.119201, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. 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. 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.