Gail D. Williamson, MD
Internal Medicine Physician · Canton, IL
Gail D. Williamson, MD is an internal medicine physician with a practice address in Canton, Illinois, and NPI 1376597732, issued on May 20, 2006. Check the license (Illinois 036078962, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Gail D. Williamson
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 036078962 IL
Self-reported in NPPES; status is on the state search - Practice location
- 762 E Chestnut St, Canton, IL 61520
- Phone
- (309) 353-6301
- Enumerated
- May 20, 2006
- Record last updated
- Jul 11, 2025
- Fax
- (844) 813-1772
- Medicaid ID
- 036078962 IL
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Verify Gail D. Williamson 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 036078962Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average internal medicine physician in 2024
213 Medicare Part D claims for 27 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 5% of claims.
Most prescribed
- Amlodipine Besylate24 claims
- Metoprolol Tartrate11 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.
Gail D. Williamson among 7,238 internal medicine physician records in Illinois
Gail D. Williamson, MD is one of 7,238 internal medicine physician records with a practice address in Illinois. 73% 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, 61% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileNo · 50% of these records are
- Record last updated2025 · 47% 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 Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
5 internal medicine physician records list a practice address in Canton
They are 5 of the 197 NPPES records with a practice address in Canton, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Canton → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Kenneth Krock, MDCanton, IL 615201699883868
- John McCarthy, MDCanton, IL 615201033327069
- Benjamin Phillips, MDCanton, IL 615201275678021
- Jimmie Smith, MDCanton, IL 615201194834937
- Christopher Nau, MDChillicothe, IL 615231104023092
- Robert Riech, M.D., MPHChillicothe, IL 615231437225935
- Jason Chamberlin, DOFarmington, IL 615311831207349
- Thaw Tun, MDHenry, IL 615371326142902
Common questions
What is Gail D. Williamson, MD's NPI number?
Gail D. Williamson, MD's National Provider Identifier (NPI) is 1376597732, issued on May 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gail D. Williamson, MD located?
The NPPES record lists a practice address at 762 E Chestnut St, Canton, IL, 61520. Phone: (309) 353-6301. Providers update this record themselves, so call before visiting.
How can I verify Gail D. Williamson, MD's license?
NPPES lists Illinois license number 036078962, 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.
How much does Gail D. Williamson, MD prescribe under Medicare Part D?
In 2024, Gail D. Williamson, MD had 213 Medicare Part D claims for 27 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.