Wilhelm Leonard Castellon
Internal Medicine Physician · Clarion, PA
Wilhelm Leonard Castellon is an internal medicine physician with a practice address in Clarion, Pennsylvania, and NPI 1821471327, issued on Jul 1, 2015. Check the license (Pennsylvania OT016669, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- Wilhelm Leonard Castellon
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- OT016669 PA
U2802 TX
Self-reported in NPPES; status is on the state search - Practice location
- 24 Doctors LN, Clarion, PA 16214
- Phone
- (814) 226-2500
- Enumerated
- Jul 1, 2015
- Record last updated
- May 16, 2023
- Fax
- (814) 226-2501
- Medicare enrollment
- Enrolled (PECOS I20230530002549); accepts Medicare assignment
- Medical or professional school
- Lake Erie College Of Osteopathic Medicine, Erie, 2014
- Entity
- Type 1 · individual
Also registered at 24 Doctors LN
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Arthur Dortort, DOFamily Medicine Physician1780633636
- Brandon Doverspike, D.O.Family Medicine Physician1962811497
- Shelby FillmanNurse Practitioner1073394532
- Thomas Freenock, M.D.Physical Medicine & Rehabilitation Physician1184604498
- Pamela Karg, MSN, CRNPNurse Practitioner1619943974
- Beverly O'Rourke, CRNPFamily Nurse Practitioner1003990409
Verify Wilhelm Leonard Castellon in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license OT016669Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
94% fewer Medicare Part D claims than the average internal medicine physician in 2024
203 Medicare Part D claims for 123 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 6% of claims.
Most prescribed
- Cefdinir27 claims
- Prednisone26 claims
- Doxycycline Hyclate21 claims
- Pantoprazole Sodium13 claims
- Levofloxacin11 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 2 group practices
- Hospitalist Medicine Physicians OF Ohio-Columbus II Professional CorpChillicothe, OH
- Hospitalist Medicine Physicians OF Texas PLLCPlainview, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
3 internal medicine physician records list a practice address in Clarion
They are 3 of the 307 NPPES records with a practice address in Clarion, and 7,300 internal medicine physician records in Pennsylvania.
All 3 in Clarion → All 7,300 in Pennsylvania → Every provider in Clarion →
Other internal medicine physician records in Pennsylvania
- Saira Aamir, MDYork, PA1184515686
- John Aaron, MDWest Grove, PA1427094531
- Todd Aaron, MDPhiladelphia, PA1457350522
- Joseph Abalos, M.D.Seneca, PA1215128434
- Mubasher Abbas, MDYork, PA1578978425
- Nicholas AbbottFarrell, PA1639525678
- Sara Abbruzzi, D.O.Philadelphia, PA1689686313
- Ahmad Abdalla, MDPhiladelphia, PA1730981127
- Tori Abdalla, DOPhiladelphia, PA1942091699
- Hany Abdel, D.O.Plymouth Meeting, PA1164467262
Common questions
What is Wilhelm Leonard Castellon's NPI number?
Wilhelm Leonard Castellon's National Provider Identifier (NPI) is 1821471327, issued on Jul 1, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Wilhelm Leonard Castellon located?
The NPPES record lists a practice address at 24 Doctors LN, Clarion, PA, 16214. Phone: (814) 226-2500. Providers update this record themselves, so call before visiting.
How can I verify Wilhelm Leonard Castellon's license?
NPPES lists Pennsylvania license number OT016669, 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 Wilhelm Leonard Castellon prescribe under Medicare Part D?
In 2024, Wilhelm Leonard Castellon had 203 Medicare Part D claims for 123 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.