Maryellen Estevez Pfeiffer, D.O.
Internal Medicine Physician · York, PA
Maryellen Estevez Pfeiffer, D.O. is an internal medicine physician with a practice address in York, Pennsylvania, and NPI 1609076165, issued on Jul 23, 2007. Check the license (Pennsylvania OS013949, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- Maryellen Estevez Pfeiffer
- Credential
- D.O.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- OS013949 PA
Self-reported in NPPES; status is on the state search - Practice location
- 1001 S George St, York, PA 17403
- Phone
- (717) 851-4005
- Enumerated
- Jul 23, 2007
- Record last updated
- Feb 3, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (717) 812-2495
- Medicaid IDs
- 033831100 MD
102179302 PA - Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,300 in Pennsylvania → Look up another NPI →
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Verify Maryellen Estevez Pfeiffer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license OS013949Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average internal medicine physician in 2024
21 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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.
Maryellen Estevez Pfeiffer among 7,300 internal medicine physician records in Pennsylvania
Maryellen Estevez Pfeiffer, 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 2007, is newer than 36% of them.
- NPI issued2007 · 36% of these records are older, 57% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileNo · 58% of these records are
- Record last updated2020 · 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).
164 internal medicine physician records list a practice address in York
They are 164 of the 4,575 NPPES records with a practice address in York, and 7,300 internal medicine physician records in Pennsylvania.
All 7,300 in Pennsylvania → Every provider in York → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Cyrus Beekey, MDYork, PA 174031972539336
- Todd Butz, MDYork, PA 174031477589026
- Robert Fritz, DOYork, PA 174031003882135
- Benjamin Hoover, M.D.York, PA 174031346272416
- Mark Illfelder, DOYork, PA 174031568438869
- Thomas Kurland, DOYork, PA 174031679549901
- W Leedy, DOYork, PA 174031235105115
- Bonny Lightner, DOYork, PA 174031902872187
Common questions
What is Maryellen Estevez Pfeiffer, D.O.'s NPI number?
Maryellen Estevez Pfeiffer, D.O.'s National Provider Identifier (NPI) is 1609076165, issued on Jul 23, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Maryellen Estevez Pfeiffer, D.O. located?
The NPPES record lists a practice address at 1001 S George St, York, PA, 17403. Phone: (717) 851-4005. Providers update this record themselves, so call before visiting.
How can I verify Maryellen Estevez Pfeiffer, D.O.'s license?
NPPES lists Pennsylvania license number OS013949, 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 Maryellen Estevez Pfeiffer, D.O. prescribe under Medicare Part D?
In 2024, Maryellen Estevez Pfeiffer, D.O. had 21 Medicare Part D claims; 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.