Patrick Michael Casey, DO, MS
Internal Medicine Physician · Lancaster, PA
Patrick Michael Casey, DO, MS is an internal medicine physician with a practice address in Lancaster, Pennsylvania, and NPI 1114603248, issued on Jun 23, 2023. Check the license (Pennsylvania OS025899, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- Patrick Michael Casey
- Credential
- DO, MS
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- OS025899 PA
Self-reported in NPPES; status is on the state search - Practice location
- 555 N Duke St, Lancaster, PA 17602
- Phone
- (717) 544-8144
- Enumerated
- Jun 23, 2023
- Record last updated
- Jul 13, 2026
- Fax
- (717) 544-8140
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,300 in Pennsylvania → Look up another NPI →
Also registered at 555 N Duke St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ashraf Abou-Elella, MDAnatomic Pathology & Clinical Pathology Physician1972567626
- Joyce AbrahamCertified Registered Nurse Anesthetist1962242099
- Marie AceboRegistered Dietitian1053347757
- Nancy Adamopoulos, MDInternal Medicine Physician1003896283
- Jill Adams, MDFamily Medicine Physician1356184733
- Rebecca Adams, CRNPGerontology Nurse Practitioner1780041723
Verify Patrick Michael Casey in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license OS025899Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average internal medicine physician in 2024
272 Medicare Part D claims for 88 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium20 claims
- Amlodipine Besylate18 claims
- Metformin Hcl18 claims
- Losartan-Hydrochlorothiazide13 claims
- Lisinopril12 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.
Patrick Michael Casey among 7,300 internal medicine physician records in Pennsylvania
Patrick Michael Casey, DO, MS is one of 7,300 internal medicine physician records with a practice address in Pennsylvania. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2023, is newer than 89% of them.
- NPI issued2023 · 89% of these records are older, 7% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileNo · 58% of these records are
- Record last updated2026 · 56% 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 Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
91 internal medicine physician records list a practice address in Lancaster
They are 91 of the 5,378 NPPES records with a practice address in Lancaster, and 7,300 internal medicine physician records in Pennsylvania.
All 7,300 in Pennsylvania → Every provider in Lancaster → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Nancy Adamopoulos, MDLancaster, PA 176021003896283
- Christopher Addis, M.D.Lancaster, PA 176021649269150
- Philip Billoni, MDLancaster, PA 176021255320222
- Hyasmine Charles, MDLancaster, PA 176021922059526
- Vinesh Dedhia, MDLancaster, PA 176021487747614
- John Derderian, DOLancaster, PA 176021477595445
- Michelle Jordan, DOLancaster, PA 176021700815214
- Otto Lauter, M.D.Lancaster, PA 176021174512230
Common questions
What is Patrick Michael Casey, DO, MS's NPI number?
Patrick Michael Casey, DO, MS's National Provider Identifier (NPI) is 1114603248, issued on Jun 23, 2023. An NPI identifies a provider in billing; it is not a license.
Where is Patrick Michael Casey, DO, MS located?
The NPPES record lists a practice address at 555 N Duke St, Lancaster, PA, 17602. Phone: (717) 544-8144. Providers update this record themselves, so call before visiting.
How can I verify Patrick Michael Casey, DO, MS's license?
NPPES lists Pennsylvania license number OS025899, 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 Patrick Michael Casey, DO, MS prescribe under Medicare Part D?
In 2024, Patrick Michael Casey, DO, MS had 272 Medicare Part D claims for 88 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.