William J. Barker, MD
Emergency Medical Services (Emergency Medicine) Physician · Warrenton, VA
William J. Barker, MD is an emergency medical services (emergency medicine) physician with a practice address in Warrenton, Virginia, and NPI 1770599847, issued on Jul 31, 2006. Check the license (Virginia 0101036994, as entered in NPPES) on the Virginia Department of Health Professions; the Medicare figures below come from public CMS files.
- Name
- William J. Barker
- Credential
- MD
- Primary taxonomy
- Emergency Medical Services (Emergency Medicine) Physician 207PE0004X
- License number
- 0101036994 VA
Self-reported in NPPES; status is on the state search - Practice location
- 500 Hospital Dr, Warrenton, VA 20186
- Phone
- (540) 349-0595
- Enumerated
- Jul 31, 2006
- Record last updated
- Apr 30, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (540) 349-0587
- Medicaid IDs
- 006028608 VA
010055601 VA - Entity
- Type 1 · individual
8 nearest emergency medical services (emergency medicine) physician records → All 82 in Virginia → Look up another NPI →
Also registered at 500 Hospital Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Zohayr Alshaial, M.D.Internal Medicine Physician1841245537
- Arij Azhar, MDCritical Care Medicine (Internal Medicine) Physician1811493299
- Jennifer Benjamin, PAMedical Physician Assistant1639183593
- Melissa Braun, NPNeonatal Nurse Practitioner1023365335
- Robert Burrus, PAMedical Physician Assistant1730195819
Verify William J. Barker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersVirginia Department of Health Professions
Search for license 0101036994Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
50% fewer Medicare Part D claims than the average emergency medical services (emergency medicine) physician in 2024
147 Medicare Part D claims for 97 beneficiaries, against an average of 292 among the 1,653 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims. 18 claims were for opioids.
Most prescribed
- Tramadol Hcl13 claims
- Albuterol Sulfate Hfa12 claims
- Doxycycline Hyclate11 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 J. Barker among 82 emergency medical services (emergency medicine) physician records in Virginia
William J. Barker, MD is one of 82 emergency medical services (emergency medicine) physician records with a practice address in Virginia. 52% 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 4% of them.
- NPI issued2006 · 4% of these records are older, 15% newer
- In a Medicare fileYes · 52% of these records are
- In the CMS Doctors and Clinicians fileNo · 39% of these records are
- Record last updated2008 · 82% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207PE0004X and a Virginia practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
12 emergency medical services (emergency medicine) physician records list a practice address in Warrenton
They are 12 of the 592 NPPES records with a practice address in Warrenton, and 82 emergency medical services (emergency medicine) physician records in Virginia.
All 82 in Virginia → Every provider in Warrenton → Emergency Medical Services (Emergency Medicine) Physician nationwide →
The 8 emergency medical services (emergency medicine) physician records with the nearest ZIP codes
- Joseph Chu, MDWarrenton, VA 201861104832278
- Michael Jenks, MDWarrenton, VA 201861487660551
- Jeffrey Joseph, DOWarrenton, VA 201861346256427
- Aamir Latif, MDWarrenton, VA 201861750395612
- Patrick Meehan, MDWarrenton, VA 201861356355226
- Kristy Reynolds, MDWarrenton, VA 201861306850268
- Joseph Servideo, MDWarrenton, VA 201861013921972
- Nasser Sitta, MDWarrenton, VA 201861992719843
Common questions
What is William J. Barker, MD's NPI number?
William J. Barker, MD's National Provider Identifier (NPI) is 1770599847, issued on Jul 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William J. Barker, MD located?
The NPPES record lists a practice address at 500 Hospital Dr, Warrenton, VA, 20186. Phone: (540) 349-0595. Providers update this record themselves, so call before visiting.
How can I verify William J. Barker, MD's license?
NPPES lists Virginia license number 0101036994, 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 J. Barker, MD prescribe under Medicare Part D?
In 2024, William J. Barker, MD had 147 Medicare Part D claims for 97 beneficiaries; the average among emergency medical services (emergency medicine) physician prescribers was 292. 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.