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    Dr. John J. Mast, MD

    Internal Medicine - Geriatrics

    • (717) 689-4243

    Dr. Mast's Overview

    Dr. 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: 20

    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

    Please verify insurance information directly with your doctor's office as it may change frequently.

    • Aetna Choice POS II
    • Aetna HMO
    • Aetna Managed Choice POS
    • 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
    • View More

    Dr. Mast's Office Information & Appointments

    Office Locations

    Lancaster General Health Phsyicians
    Sycamore Geriatric

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


    Office Hours and Information

    Fax: (717) 689-1950

    Practice Website:

    Accepting New Patients: Yes

    Medicare Accepted: Yes

    Medicaid Accepted: No

    Not Available

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