Daniel Mast, DO

Geriatrics

20+ years in practiceNPI: 1104910140Licensed in DELicensed in PA

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Credentials & Recognition

Specialties

Geriatrics

NPI sub-specialties

Internal Medicine207R00000X

Internal Medicine, Geriatric Medicine207RG0300X

Internal Medicine, Geriatric Medicine207RG0300X

Internal Medicine207R00000X

Practice Signals

Editorial signals beyond credentials. Patient transparency over opacity. See methodology.

Mid-Level (PA/NP) Use

Doctor-led visits

Years in Practice

20+ years

Estimated from NPI enumeration date

Featured in PBCMMG Rankings

#3

Top Geriatricians in Delaware, 2026

Geriatrics · Delaware · 2026

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Frequently Asked Questions about Dr. Daniel Mast, DO

Where does Dr. Daniel Mast, DO practice?+
Dr. Daniel Mast, DO practices in Delaware, DE. 802 NEW HOLLAND AVE STE 200 LANCASTER, PA 176022288.
What is Dr. Daniel Mast, DO's phone number?+
Dr. Daniel Mast, DO's practice phone is 717-299-6371. Office contact information is verified on the PBCMMG profile.
What does Dr. Daniel Mast, DO specialize in?+
Dr. Daniel Mast, DO's primary specialty is Geriatrics.
Is Dr. Daniel Mast, DO board certified?+
Board certification status for Dr. Daniel Mast, DO has not been verified in the data sources PBCMMG uses (ABMS, state medical boards). The PBCMMG profile shows their current credential set.
How long has Dr. Daniel Mast, DO been practicing?+
Dr. Daniel Mast, DO has been in active practice for 20+ years, based on NPI enumeration and state licensing records.
What is Dr. Daniel Mast, DO's NPI number?+
Dr. Daniel Mast, DO's National Provider Identifier (NPI) is 1104910140, registered in the federal NPPES registry.

Profile maintained by Palm Beach County Medical Media Group, Inc. | Data verified from public registries (NPPES, ABMS, state medical boards). Methodology · Editorial Standards

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