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Dr. John J. Mast, MD

Internal Medicine - Geriatrics

  • (717) 689-4243

Dr. Mast's Overview

Dr. John J. Mast graduated from the Indiana University School of Medicine in 1996. He works in Elizabethtown, PA and specializes in Internal Medicine - Geriatrics. Dr. Mast is affiliated with Lancaster General Hospital.

Dr. Mast's Experience

Years in Practice: 19

Dr. Mast's Specialties

Internal Medicine - Geriatrics

Dr. Mast's Education & Training

Medical School: Indiana University School of Medicine; Graduated 1996

Dr. Mast's Rating

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Overall Rating


  • Explains conditions & treatments
  • Takes time to answer my questions
  • Provides follow-up as needed
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Dr. Mast's Accepted Insurance

  • Aetna Choice POS II
  • Aetna HMO
  • Aetna Managed Choice POS Open Access
  • Aetna Select
  • Aetna Signature Administrators PPO
  • BCBS Blue Card PPO
  • Capital BC Keystone Health Plan Central HMO
  • Capital BC PPO
  • CIGNA Open Access Plus
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Dr. Mast's Office Information & Appointments

Office Locations

Lancaster General Medical Group
Sycamore Square Family Medicine

99 Masonic Dr Ste 101
Elizabethtown, PA 17022
(717) 689-4243


Office Hours and Information

Fax: (717) 689-1950

Practice Website:

Accepting New Patients: No

Medicare Accepted: Yes

Medicaid Accepted: No

Not Available

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Dr. Mast's Hospital Affiliations

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