Joseph Cassilly, M.D.
Emergency Medicine Physician · York, PA
Joseph Cassilly, M.D. is an emergency medicine physician with a practice address in York, Pennsylvania, and NPI 1184859498, issued on May 16, 2009. Check the license (Pennsylvania MT194779, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- Joseph Cassilly
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- MT194779 PA
Self-reported in NPPES; status is on the state search - Practice location
- 1001 S George St, York, PA 17403
- Phone
- (717) 851-2753
- Enumerated
- May 16, 2009
- Record last updated
- Feb 3, 2022
- Fax
- (717) 851-3020
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 3,911 in Pennsylvania → Look up another NPI →
Also registered at 1001 S George St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Saira Aamir, MDInternal Medicine Physician1184515686
- Mohammed Asfar Abdus SamadInternal Medicine Physician1487491353
- Elias Abebe, MDNeonatal-Perinatal Medicine Physician1831358480
- Amanda Achenbach, PACMedical Physician Assistant1972865095
- Basilio Addo, M.DCardiovascular Disease Physician1124515838
- Ayotemi AdewalePsychiatry Physician1801727300
Verify Joseph Cassilly in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license MT194779Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
60% fewer Medicare Part D claims than the average emergency medicine physician in 2024
91 Medicare Part D claims for 68 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 18 claims were for opioids.
Most prescribed
- Oxycodone Hcl15 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.
Joseph Cassilly among 3,911 emergency medicine physician records in Pennsylvania
Joseph Cassilly, M.D. is one of 3,911 emergency medicine physician records with a practice address in Pennsylvania. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 43% of them.
- NPI issued2009 · 43% of these records are older, 54% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileNo · 57% of these records are
- Record last updated2022 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
184 emergency medicine physician records list a practice address in York
They are 184 of the 4,575 NPPES records with a practice address in York, and 3,911 emergency medicine physician records in Pennsylvania.
All 3,911 in Pennsylvania → Every provider in York → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- James Amsterdam, D.M.D., M.D.York, PA 174031003852807
- Ronald Benenson, M.D.York, PA 174031760410252
- Michael Bohrn, M.D.York, PA 174031912936444
- John Cole, MDYork, PA 174031144293531
- Aizad Dasti, M.D.York, PA 174031518995182
- Karen Dipasquale, DOYork, PA 174031902824535
- Thomas Falvo, D.O.York, PA 174031568492148
- Lynn Jensen, M.D.York, PA 174031508893256
Common questions
What is Joseph Cassilly, M.D.'s NPI number?
Joseph Cassilly, M.D.'s National Provider Identifier (NPI) is 1184859498, issued on May 16, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Joseph Cassilly, M.D. located?
The NPPES record lists a practice address at 1001 S George St, York, PA, 17403. Phone: (717) 851-2753. Providers update this record themselves, so call before visiting.
How can I verify Joseph Cassilly, M.D.'s license?
NPPES lists Pennsylvania license number MT194779, 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 Joseph Cassilly, M.D. prescribe under Medicare Part D?
In 2024, Joseph Cassilly, M.D. had 91 Medicare Part D claims for 68 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.