NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Daniel D Mast, D.O.

Internal Medicine Physician in Lancaster, PA · enumerated 2006 · practices at Union Community Care.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1104910140

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Daniel D Mast
Credential D.O.
Sex Male
Practice address 802 New Holland Ave Ste 200, Lancaster, PA, 17602
Phone (717) 299-6371
Enumeration date Oct 3, 2006
Last updated in NPPES Jun 4, 2021

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License C2-0012667 (DE) Secondary
207RG0300X Geriatric Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License OS-006313L (PA) Secondary
207RG0300X Geriatric Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License C2-0012667 (DE) Secondary
207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License OS-006313L (PA) Primary
DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

Other identifiers

Identifier Type State Issuer
0015871020009 Medicaid PA -

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Daniel Mast?
Daniel Mast is registered in NPPES with the primary taxonomy of Internal Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-06-04.