Leroy Thomson, M.D.
NPI 1477651750 · Anesthesiology Physician · Barrington, IL
Enrolled with Medicare as Practitioner - Anesthesiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Leroy Thomson, M.D. is a Anesthesiology Physician provider in Barrington, IL (NPI 1477651750).
Provider details
- NPI number
- 1477651750
- Entity type
- Individual
- Primary specialty
- Anesthesiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 35844 (AZ)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
158 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Anesthesia for Other Procedure on Esophagus, Stomach, Or Upper Small Bowel Using an Endoscope00731 | 33 | $143 |
| Anesthesia for Other Procedure on Large Bowel Using an Endoscope00811 | 28 | $136 |
| Anesthesia for Exam of Colon Using an Endoscope00812 | 24 | $115 |
| Anesthesia for Lens Surgery00142 | 23 | $134 |
| Injection of Anesthetic Agent And/Or Steroid Into Thigh Nerve (femoral Nerve)64447 | 19 | $61 |
| Anesthesia for Procedure on Small and Large Bowel Using an Endoscope00813 | 16 | $172 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-09-20
- Last updated
- 2021-12-20
- Certified
- 2021-12-20
Frequently asked questions
- What is Leroy Thomson's NPI number?
- Leroy Thomson's National Provider Identifier (NPI) is 1477651750, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Leroy Thomson's specialty?
- Leroy Thomson is listed in the NPPES registry with a primary specialty of Anesthesiology Physician (Allopathic & Osteopathic Physicians).
- Where is Leroy Thomson located?
- Leroy Thomson's practice location on file with NPPES is 450 W Il Route 22, Barrington, IL 60010-1919.
- What is Leroy Thomson's phone number?
- The practice phone number listed in the NPPES registry for Leroy Thomson is (224) 465-3288.
- Does Leroy Thomson accept Medicare?
- Leroy Thomson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Leroy Thomson's NPI active?
- Yes — Leroy Thomson's NPI (1477651750) is active in the NPPES registry as of the last update on 2021-12-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.