Daniel D. Mast, D.O.
Internal Medicine Physician · Lancaster, PA
Daniel D. Mast, D.O. is an internal medicine physician with a practice address in Lancaster, Pennsylvania, and NPI 1104910140, issued on Oct 3, 2006. Check the license (Pennsylvania OS-006313L, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- Daniel D. Mast
- Credential
- D.O.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- OS-006313L PA
C2-0012667 DE
Self-reported in NPPES; status is on the state search - Practice location
- 802 New Holland Ave Ste 200, Lancaster, PA 17602
- Phone
- (717) 299-6371
- Enumerated
- Oct 3, 2006
- Record last updated
- Jun 4, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 0015871020009 PA
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,300 in Pennsylvania → Look up another NPI →
Also registered at 802 New Holland Ave Ste 200
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Augustine Chebarwett, CRNPFamily Nurse Practitioner1851010300
- Taylor Corbin, PHARMDPharmacist1487290748
- Jessica D'Souza, MDFamily Medicine Physician1780179671
- Thomas Gates, MDFamily Medicine Physician1477591584
- Christine Gold, CRNPAdult Health Nurse Practitioner1982636643
- Linda Gort, CRNP (FNP)Nurse Practitioner1043256076
Verify Daniel D. Mast in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license OS-006313LCheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
31% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,204 Medicare Part D claims for 143 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 90 claims were for opioids.
Most prescribed
- Atorvastatin Calcium125 claims
- Gabapentin102 claims
- Omeprazole78 claims
- Trulicity72 claims
- Lisinopril71 claims
- Amlodipine Besylate63 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Daniel D. Mast among 7,300 internal medicine physician records in Pennsylvania
Daniel D. Mast, D.O. is one of 7,300 internal medicine physician records with a practice address in Pennsylvania. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 64% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileNo · 58% of these records are
- Record last updated2021 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
91 internal medicine physician records list a practice address in Lancaster
They are 91 of the 5,378 NPPES records with a practice address in Lancaster, and 7,300 internal medicine physician records in Pennsylvania.
All 7,300 in Pennsylvania → Every provider in Lancaster → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Nancy Adamopoulos, MDLancaster, PA 176021003896283
- Christopher Addis, M.D.Lancaster, PA 176021649269150
- Philip Billoni, MDLancaster, PA 176021255320222
- Hyasmine Charles, MDLancaster, PA 176021922059526
- Vinesh Dedhia, MDLancaster, PA 176021487747614
- John Derderian, DOLancaster, PA 176021477595445
- Michelle Jordan, DOLancaster, PA 176021700815214
- Otto Lauter, M.D.Lancaster, PA 176021174512230
Common questions
What is Daniel D. Mast, D.O.'s NPI number?
Daniel D. Mast, D.O.'s National Provider Identifier (NPI) is 1104910140, issued on Oct 3, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Daniel D. Mast, D.O. located?
The NPPES record lists a practice address at 802 New Holland Ave Ste 200, Lancaster, PA, 17602. Phone: (717) 299-6371. Providers update this record themselves, so call before visiting.
How can I verify Daniel D. Mast, D.O.'s license?
NPPES lists Pennsylvania license number OS-006313L, as entered by the provider. Search the Pennsylvania Department of State (PALS) at https://www.pals.pa.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Daniel D. Mast, D.O. prescribe under Medicare Part D?
In 2024, Daniel D. Mast, D.O. had 2,204 Medicare Part D claims for 143 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.