John David Six, MD
Family Medicine Physician · Claysville, PA
John David Six, MD is a family medicine physician with a practice address in Claysville, Pennsylvania, and NPI 1750332342, issued on May 16, 2006. Check the license (Pennsylvania MD428275, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- John David Six
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- MD428275 PA
Self-reported in NPPES; status is on the state search - Practice location
- 1263 Route 40 W, Claysville, PA 15323
- Phone
- (724) 663-9018
- Enumerated
- May 16, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (724) 663-9022
- Medicare enrollment
- Enrolled (PECOS I20041129000268); accepts Medicare assignment
- Medical or professional school
- Jefferson Medical College Of Thomas Jefferson University, 2003
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 7,483 in Pennsylvania → Look up another NPI →
Also registered at 1263 Route 40 W
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Frederick Landenwitsch, MDFamily Medicine Physician1427001783
- Mark Mamros, M.D.Family Medicine Physician1245221829
- Jennifer MayFamily Nurse Practitioner1295396943
- Tammy Underwood, FNP-CFamily Medicine Physician1902587405
- Jay Ziegler, M.D.Family Medicine Physician1386697662
Verify John David Six in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license MD428275Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average family medicine physician in 2024
24 Medicare Part D claims, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
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
- Upmc WashingtonWashington, PA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John David Six among 7,483 family medicine physician records in Pennsylvania
John David Six, MD is one of 7,483 family medicine physician records with a practice address in Pennsylvania. 79% 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 12% of them.
- NPI issued2006 · 12% of these records are older, 53% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 61% of these records are
- Graduated2003 · median 2005 among the 4,529 with a school on file
- Record last updated2007 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
10 family medicine physician records list a practice address in Claysville
They are 10 of the 25 NPPES records with a practice address in Claysville, and 7,483 family medicine physician records in Pennsylvania.
All 7,483 in Pennsylvania → Every provider in Claysville → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Frederick Landenwitsch, MDClaysville, PA 153231427001783
- Mark Mamros, M.D.Claysville, PA 153231245221829
- Elizabeth Oshnock, DOClaysville, PA 153231750527529
- Kristen Romesburg, DOClaysville, PA 153231467698225
- Brian Szklinski, M.DClaysville, PA 153231902897770
- Abigail Templeton, M.D.Claysville, PA 153231194978486
- Tammy Underwood, FNP-CClaysville, PA 153231902587405
- Sarah White, DOClaysville, PA 153231225474315
Common questions
What is John David Six, MD's NPI number?
John David Six, MD's National Provider Identifier (NPI) is 1750332342, issued on May 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John David Six, MD located?
The NPPES record lists a practice address at 1263 Route 40 W, Claysville, PA, 15323. Phone: (724) 663-9018. Providers update this record themselves, so call before visiting.
How can I verify John David Six, MD's license?
NPPES lists Pennsylvania license number MD428275, as entered by the provider. Search the Pennsylvania Department of State (PALS) at https://www.pals.pa.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John David Six, MD prescribe under Medicare Part D?
In 2024, John David Six, MD had 24 Medicare Part D claims; the average among family medicine physician prescribers was 3,544. 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.