Margaret Thomas, M.D.
Family Medicine Physician · Lancaster, PA
Margaret Thomas, M.D. is a family medicine physician with a practice address in Lancaster, Pennsylvania, and NPI 1093871444, issued on Dec 29, 2006. Check the license (Pennsylvania MD431281, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- Margaret Thomas
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- MD431281 PA
Self-reported in NPPES; status is on the state search - Practice location
- 555 N Duke St, Lancaster, PA 17602
- Phone
- (717) 544-4950
- Enumerated
- Dec 29, 2006
- Record last updated
- Jul 19, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (717) 544-4149
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 7,483 in Pennsylvania → Look up another NPI →
Also registered at 555 N Duke St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Margaret Thomas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license MD431281Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4.6 times the Medicare Part D claims of the average family medicine physician in 2024
16,349 Medicare Part D claims for 198 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. 42 claims were for opioids.
Most prescribed
- Atorvastatin Calcium1,075 claims
- Levothyroxine Sodium989 claims
- Eliquis859 claims
- Lisinopril651 claims
- Furosemide646 claims
- Mirtazapine644 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.
Margaret Thomas among 7,483 family medicine physician records in Pennsylvania
Margaret Thomas, 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 fileNo · 61% of these records are
- 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).
213 family medicine physician records list a practice address in Lancaster
They are 213 of the 5,378 NPPES records with a practice address in Lancaster, and 7,483 family medicine physician records in Pennsylvania.
All 7,483 in Pennsylvania → Every provider in Lancaster → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- David Byler, MDLancaster, PA 176021710935648
- Federico Ceppa, MDLancaster, PA 176021144284704
- Howard Gerstein, MDLancaster, PA 176021346298999
- Jeffrey Kirchner, DOLancaster, PA 176021104864214
- D Thais Magill, M.D.Lancaster, PA 176021932172814
- Jeffrey Martin, MDLancaster, PA 176021578501680
- Luke Morley, DOLancaster, PA 176021033196332
- Maria Perlis, M.D.Lancaster, PA 176021275582314
Common questions
What is Margaret Thomas, M.D.'s NPI number?
Margaret Thomas, M.D.'s National Provider Identifier (NPI) is 1093871444, issued on Dec 29, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Margaret Thomas, M.D. located?
The NPPES record lists a practice address at 555 N Duke St, Lancaster, PA, 17602. Phone: (717) 544-4950. Providers update this record themselves, so call before visiting.
How can I verify Margaret Thomas, M.D.'s license?
NPPES lists Pennsylvania license number MD431281, 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 Margaret Thomas, M.D. prescribe under Medicare Part D?
In 2024, Margaret Thomas, M.D. had 16,349 Medicare Part D claims for 198 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.
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.