NPPES file of Aug 9, 2026

John J. Mast, M.D.

Family Medicine Physician · Elizabethtown, PA

John J. Mast, M.D. is a family medicine physician with a practice address in Elizabethtown, Pennsylvania, and NPI 1154392371, issued on Jan 27, 2006. Check the license (Pennsylvania MD066311L, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1154392371
Name
John J. Mast
Credential
M.D.
Primary taxonomy
Family Medicine Physician 207Q00000X
License number
MD066311L PA
Self-reported in NPPES; status is on the state search
Practice location
418 Cloverleaf RD, Elizabethtown, PA 17022
Phone
(717) 653-1467
Enumerated
Jan 27, 2006
Record last updated
Oct 25, 2007 (not updated in 19 years: call before relying on the address or phone)
Fax
(717) 653-1001
Medicaid ID
0017331020001 PA
Medicare enrollment
Enrolled (PECOS I20051017000619); accepts Medicare assignment
Medical or professional school
Indiana University School Of Medicine, 1996
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest family medicine physician records → All 7,483 in Pennsylvania → Look up another NPI →

Also registered at 418 Cloverleaf RD

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Alyxandria Andrews, CRNPFamily Medicine Physician1568237022
  2. Gerald Baer, M.D.Family Medicine Physician1255310637
  3. Caitlin Basile, M.D.Family Medicine Physician1821418443
  4. Paul Brubaker, M.D.Family Medicine Physician1457330722
  5. Anna Catalano, D.O.Family Medicine Physician1508392440
  6. Scott Conley, M.D.Family Medicine Physician1164401436

Verify John J. Mast in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
    Search for license MD066311L    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Pennsylvania license search

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36% more Medicare Part D claims than the average family medicine physician in 2024

4,818 Medicare Part D claims for 290 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 65 claims were for opioids.

  1. John Mast4,818
  2. Specialty average3,544

Most prescribed

  1. Memantine Hcl269 claims
  2. Eliquis231 claims
  3. Levothyroxine Sodium228 claims
  4. Gabapentin176 claims
  5. Metoprolol Succinate149 claims
  6. Amlodipine Besylate140 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.

One hospital affiliation

  1. Lancaster General HospitalLancaster, PA · Acute Care Hospitals5 of 5 stars

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.

John J. Mast among 7,483 family medicine physician records in Pennsylvania

John J. Mast, M.D. is one of 7,483 family medicine physician records with a practice address in Pennsylvania. 79% 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 12% of them.

  • NPI issued2006 · 12% of these records are older, 53% newer
  • In a Medicare fileYes · 79% of these records are
  • In the CMS Doctors and Clinicians fileYes · 61% of these records are
  • Graduated1996 · median 2005 among the 4,529 with a school on file
  • Record last updated2007 · 58% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

37 family medicine physician records list a practice address in Elizabethtown

They are 37 of the 302 NPPES records with a practice address in Elizabethtown, and 7,483 family medicine physician records in Pennsylvania.

All 7,483 in Pennsylvania → Every provider in Elizabethtown → Family Medicine Physician nationwide →

The 8 family medicine physician records with the nearest ZIP codes

  1. Gerald Baer, M.D.Elizabethtown, PA 170221255310637
  2. Christopher Brabazon, DOElizabethtown, PA 170221942260435
  3. Paul Brubaker, M.D.Elizabethtown, PA 170221457330722
  4. Scott Conley, M.D.Elizabethtown, PA 170221164401436
  5. Glenda Cook, M.D.Elizabethtown, PA 170221275503286
  6. Dwight Eichelberger, M.D.Elizabethtown, PA 170221336128719
  7. Eric Esch, M.D.Elizabethtown, PA 170221245219625
  8. Robin Gish, M.D.Elizabethtown, PA 170221992785448

Common questions

What is John J. Mast, M.D.'s NPI number?

John J. Mast, M.D.'s National Provider Identifier (NPI) is 1154392371, issued on Jan 27, 2006. An NPI identifies a provider in billing; it is not a license.

Where is John J. Mast, M.D. located?

The NPPES record lists a practice address at 418 Cloverleaf RD, Elizabethtown, PA, 17022. Phone: (717) 653-1467. Providers update this record themselves, so call before visiting.

How can I verify John J. Mast, M.D.'s license?

NPPES lists Pennsylvania license number MD066311L, 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 John J. Mast, M.D. prescribe under Medicare Part D?

In 2024, John J. Mast, M.D. had 4,818 Medicare Part D claims for 290 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.