John HorwhatM.D.
Gastroenterology·Lancaster, PA
John Horwhat, M.D. is a Gastroenterology provider in Lancaster, PA affiliated with 2 ambulatory surgery centers in PA, as of July 2026.
- NPI1487747242
- Registered2006
- Centers2
- StatePA
- Class of1992
Case volumes, referral patterns, and payer mix live in DataLily AI Insights.
Ambulatory surgery centers
Centers whose service lines match this provider’s. Affiliations change; verify independently.
Education
Education on record as of August 2026.
John Horwhat at a glance
- Provider
- John Horwhat
- Credential
- M.D.
- Specialty
- Gastroenterology
- Procedures
- Gastroenterology CPT codes
- Location
- Lancaster, PA
- Medical school
- Temple University School of Medicine
- Graduated
- 1992
- NPI registered
- 2006
- NPI
- 1487747242
- Snapshot
- July 2026
Identity, specialty, and affiliations change over time. This is not an endorsement, and not clinical, billing, or legal advice. Providers may request corrections at founders@datalilyai.com. Read the DataLily AI data methodology.
Questions
Where does John Horwhat practice?
John Horwhat, M.D. is based in Lancaster, PA and is affiliated with 2 ambulatory surgery centers: Midatlantic Gastronintestinal Center III in Ephrata, PA and Midatlantic Endoscopy LLC Dba Mid Atlantic Gastrointestinal Center in Lancaster, PA. Affiliations reflect the current DataLily AI snapshot (July 2026) and can change.
What is John Horwhat's NPI number?
John Horwhat's National Provider Identifier (NPI) is 1487747242, registered in 2006. Specialty on record: Gastroenterology; credential M.D.
Where did John Horwhat go to medical school?
John Horwhat, M.D. attended Temple University School of Medicine, graduating in 1992.
How many Gastroenterology providers in Pennsylvania work at ambulatory surgery centers?
186 Gastroenterology surgeons and proceduralists in Pennsylvania are affiliated with ambulatory surgery centers in DataLily AI's current snapshot, John Horwhat among them. The Pennsylvania Gastroenterology directory lists each one by city with credential, NPI, and center affiliations.
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