William Francis Barker, DO
Internal Medicine Physician · Springfield, MO
William Francis Barker, DO is an internal medicine physician with a practice address in Springfield, Missouri, and NPI 1245868157, issued on Mar 28, 2020. Check the license (Missouri 2023013570, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- William Francis Barker
- Credential
- DO
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 2023013570 MO
Self-reported in NPPES; status is on the state search - Practice location
- 3801 S National Ave Ste 1122, Springfield, MO 65807
- Phone
- (417) 269-7728
- Enumerated
- Mar 28, 2020
- Record last updated
- Oct 10, 2023
- Fax
- (417) 269-7729
- Medicare enrollment
- Enrolled (PECOS I20230816004148); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,604 in Missouri → Look up another NPI →
Also registered at 3801 S National Ave Ste 1122
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify William Francis Barker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license 2023013570Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
95% fewer Medicare Part D claims than the average internal medicine physician in 2024
163 Medicare Part D claims for 74 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Nifedipine Er15 claims
- Prednisone15 claims
- Lisinopril12 claims
- Cefdinir11 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.
Bills Medicare through one group practice
- Lester E Cox Medical CentersSpringfield, MO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Francis Barker among 2,604 internal medicine physician records in Missouri
William Francis Barker, DO is one of 2,604 internal medicine physician records with a practice address in Missouri. 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 2020, is newer than 75% of them.
- NPI issued2020 · 75% of these records are older, 21% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 55% of these records are
- Graduated2020 · median 2006 among the 1,443 with a school on file
- Record last updated2023 · 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 207R00000X and a Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
135 internal medicine physician records list a practice address in Springfield
They are 135 of the 6,403 NPPES records with a practice address in Springfield, and 2,604 internal medicine physician records in Missouri.
All 2,604 in Missouri → Every provider in Springfield → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- William Baird, DOSpringfield, MO 658071194798512
- Gigi Baker, MDSpringfield, MO 658071184666117
- John Caster, MDSpringfield, MO 658071902849854
- John Dexter, MDSpringfield, MO 658071205805538
- Stephen Holmes, MDSpringfield, MO 658071831132240
- Frederick Lobati, M.D.Springfield, MO 658071306823273
- William Moore, MDSpringfield, MO 658071700829819
- Lisa Pham, M.D.Springfield, MO 658071275502379
Common questions
What is William Francis Barker, DO's NPI number?
William Francis Barker, DO's National Provider Identifier (NPI) is 1245868157, issued on Mar 28, 2020. An NPI identifies a provider in billing; it is not a license.
Where is William Francis Barker, DO located?
The NPPES record lists a practice address at 3801 S National Ave Ste 1122, Springfield, MO, 65807. Phone: (417) 269-7728. Providers update this record themselves, so call before visiting.
How can I verify William Francis Barker, DO's license?
NPPES lists Missouri license number 2023013570, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William Francis Barker, DO prescribe under Medicare Part D?
In 2024, William Francis Barker, DO had 163 Medicare Part D claims for 74 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.