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Internist, Geriatric Specialist (elderly care)
25 years of experience
License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

Patient Reviews

Patient comments (2)

The overall average patient rating of Dr. Daniel Mast is Good. Dr. Mast has been reviewed by 13 patients who have provided 2 comments. The rating is 4 out of 5 stars.

Patient Ratings
Ease of Appointment 4.8
Promptness 4.8
Courteous Staff 4.8
Accurate Diagnosis 4.4
Bedside Manner 4.4
Spends Time with Me 4.6
Follows Up After Visit 4.8

Specialties & Research

Dr. Daniel Mast, DO is board certified in Internal Medicine and Geriatric Medicine.

  • He has special expertise in 1 area:
  • Alzheimer's Disease

Education & Awards

Dr. Mast graduated from Philadelphia College of Osteopathic Medicine. He has 2 awards.

Compassionate Doctor Recognition (2012)
On-Time Doctor Award (2014)


Dr. Mast has 4 hospital affiliations:

  • Lancaster General Hospital 
  • Lancaster Regional Medical Center 


  • Spanish
  • English

> > > > Dr. Daniel Mast, DO

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Additional Information
Dr. Daniel D Mast DO is a male Internist, has 25 years of experience and practices in Internal Medicine and Geriatric Medicine.
Where does Dr. Daniel D. Mast practice?
Dr. Daniel Mast has 2 office locations.
Dr. Daniel Mast practices Internal Medicine and Geriatric Medicine near Lancaster, PA.
See Lancaster Internists and Lancaster Geriatric Doctors.