William L. Simpson, M.D.
Internal Medicine Physician · Warrenton, VA
William L. Simpson, M.D. is an internal medicine physician with a practice address in Warrenton, Virginia, and NPI 1124092309, issued on Feb 15, 2006. Check the license (Virginia 0101048951, as entered in NPPES) on the Virginia Department of Health Professions; the Medicare figures below come from public CMS files.
- Name
- William L. Simpson
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 0101048951 VA
Self-reported in NPPES; status is on the state search - Practice location
- 332 W Lee Hwy # 251, Warrenton, VA 20186
- Phone
- (833) 362-8800
- Enumerated
- Feb 15, 2006
- Record last updated
- Jul 25, 2025
- Fax
- (540) 351-8650
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 3,599 in Virginia → Look up another NPI →
Verify William L. Simpson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersVirginia Department of Health Professions
Search for license 0101048951Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
68% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,013 Medicare Part D claims for 76 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 24 claims were for opioids.
Most prescribed
- Levothyroxine Sodium49 claims
- Sertraline Hcl44 claims
- Lisinopril43 claims
- Amlodipine Besylate41 claims
- Trazodone Hcl29 claims
- Atorvastatin Calcium26 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.
William L. Simpson among 3,599 internal medicine physician records in Virginia
William L. Simpson, M.D. is one of 3,599 internal medicine physician records with a practice address in Virginia. 77% 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 9% of them.
- NPI issued2006 · 9% of these records are older, 55% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileNo · 62% of these records are
- Record last updated2025 · 53% 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 Virginia practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
17 internal medicine physician records list a practice address in Warrenton
They are 17 of the 592 NPPES records with a practice address in Warrenton, and 3,599 internal medicine physician records in Virginia.
All 3,599 in Virginia → Every provider in Warrenton → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Jeffrey Abrams, M.D.Warrenton, VA 201861598768400
- Michael Ackerman, D.O.Warrenton, VA 201861174687917
- Jennifer Ackerman, D.O.Warrenton, VA 201861902958986
- Zohayr Alshaial, M.D.Warrenton, VA 201861841245537
- Francis Bourgeois, M.D.Warrenton, VA 201861063422830
- Joseph David, M.D.Warrenton, VA 201861851365936
- Larry Heath, MDWarrenton, VA 201861841305331
- Jae Lee, M.D.Warrenton, VA 201861851365720
Common questions
What is William L. Simpson, M.D.'s NPI number?
William L. Simpson, M.D.'s National Provider Identifier (NPI) is 1124092309, issued on Feb 15, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William L. Simpson, M.D. located?
The NPPES record lists a practice address at 332 W Lee Hwy # 251, Warrenton, VA, 20186. Phone: (833) 362-8800. Providers update this record themselves, so call before visiting.
How can I verify William L. Simpson, M.D.'s license?
NPPES lists Virginia license number 0101048951, as entered by the provider. Search the Virginia Department of Health Professions at https://dhp.virginiainteractive.org/lookup/index. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William L. Simpson, M.D. prescribe under Medicare Part D?
In 2024, William L. Simpson, M.D. had 1,013 Medicare Part D claims for 76 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.