Dr. Patrick Michael Casey , DO, MS
Internal Medicine • Lancaster, PA
Professional Overview & Biography Verified Profile Summary
Dr. Patrick Casey, DO, MS is a registered healthcare professional specializing in Internal Medicine in Lancaster, PA. Practice services are available at 555 N DUKE ST under active NPI credentials.
Practice Location & Contact Primary Location
555 N Duke St
Lancaster, PA 176022250
Specialty Benchmarks & Practice Insights
Comparative analytics for Internal Medicine in Lancaster, PA
Practicing in Lancaster, PA (7609 Statewide)
In-Person Office Visits Only
Under CMS Medicare Fee Schedule vs Standard Submitted Charges
Medical Specialties & State Licenses
CMS Verified: 2026-07-13NUCC Taxonomy Code: 207R00000X
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Secondary Practice Locations
5501 Old York Rd Ste 1
Philadelphia, PA 191413098
Phone: 4846221000
Practice Associates & Co-Workers
Healthcare professionals and specialists practicing at this location or sharing practice phone/fax
Internal Medicine
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Internal Medicine - Addiction Medicine
Doctor of Osteopathic Medicine (D.O.)
Physician Assistant - Medical
Physician Assistant (Certified)
Internal Medicine
Doctor of Medicine (M.D.)
Career & Practice History Timeline
Chronological log of verified NPI updates, location relocations, credentials, and registry changes
Internal Medicine (License #OS025899 in PA)
Registered at 555 N DUKE ST, LANCASTER, PA 176022250 (Tel: 7175448144)
Registered at 555 N DUKE ST, LANCASTER, PA 176022250 (Tel: 7175448144)
Recorded as PATRICK CASEY, DO, MS
NPI status registered as active in NPPES database
Registered at 5501 OLD YORK RD STE 1, PHILADELPHIA, PA 191413098 (Tel: 4846221000)
Registered at 5501 OLD YORK RD STE 1, PHILADELPHIA, PA 191413098
Recorded as PATRICK CASEY, DO, MBS
Internal Medicine (License #OT022930 in PA)
First registered as active Individual Practitioner in NPPES Database.
Patient & Community Reviews
Verified patient ratings, medical care experiences, and facility photos
Sign in to leave a review for Dr. Patrick Casey
Only verified registered users can submit ratings, post feedback, and upload facility photos.
NPI Administrative Meta
Mailing Address
555 N Duke St
Lancaster, PA 176022250
Phone: 7175448144
This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.