John J. Messmer, MD
Family Medicine Physician · Palmyra, PA
John J. Messmer, MD is a family medicine physician with a practice address in Palmyra, Pennsylvania, and NPI 1669437414, issued on Apr 17, 2006. Check the license (Pennsylvania MD020821E, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- John J. Messmer
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- MD020821E PA
Self-reported in NPPES; status is on the state search - Practice location
- 941 Park Dr, Palmyra, PA 17078
- Phone
- (800) 233-4082
- Enumerated
- Apr 17, 2006
- Record last updated
- Nov 16, 2009 (not updated in 17 years: call before relying on the address or phone)
- Medicaid ID
- 0010533300007 PA
- Medicare enrollment
- Enrolled (PECOS I20101130001072); accepts Medicare assignment
- Medical or professional school
- Pennsylvania State University College Of Medicine, 1977
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 7,483 in Pennsylvania → Look up another NPI →
Also registered at 941 Park Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Hadjh Ahrns, MDFamily Medicine Physician1568606713
- Erich Batra, M.D.Pediatrics Physician1952315012
- Jill D'Amico, D.O.Family Medicine Physician1811950678
- Mary Joyce Green, M.D.Family Medicine Physician1306006747
- Maria Hayes, DOFamily Medicine Physician1689639437
- George Henning, MDFamily Medicine Physician1447214275
Verify John J. Messmer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license MD020821ECheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
94% more Medicare Part D claims than the average family medicine physician in 2024
6,888 Medicare Part D claims for 486 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 150 claims were for opioids.
Most prescribed
- Atorvastatin Calcium301 claims
- Amlodipine Besylate296 claims
- Levothyroxine Sodium256 claims
- Losartan Potassium213 claims
- Metoprolol Succinate200 claims
- Simvastatin193 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 71.8 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $146.62
2 payments; by number, the most common kind was food and beverage; the largest payer was Eisai Inc. The 55,478 providers of this specialty with any payment received $902.55 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- The Milton S Hershey Medical Center Physicians GroupPalmyra, PA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John J. Messmer among 7,483 family medicine physician records in Pennsylvania
John J. Messmer, MD 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
- Graduated1977 · median 2005 among the 4,529 with a school on file
- Record last updated2009 · 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).
22 family medicine physician records list a practice address in Palmyra
They are 22 of the 149 NPPES records with a practice address in Palmyra, and 7,483 family medicine physician records in Pennsylvania.
All 7,483 in Pennsylvania → Every provider in Palmyra → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Jill D'Amico, D.O.Palmyra, PA 170781811950678
- Maria Hayes, DOPalmyra, PA 170781689639437
- George Henning, MDPalmyra, PA 170781447214275
- Adrian Hohenwarter, M.D.Palmyra, PA 170781194758227
- David Keller, M.D.Palmyra, PA 170781467417733
- Mark Leach, M.D.Palmyra, PA 170781619932936
- Jenny Lee, M.D.Palmyra, PA 170781508821836
- Samuel Rashid, M.D.Palmyra, PA 170781982669289
Common questions
What is John J. Messmer, MD's NPI number?
John J. Messmer, MD's National Provider Identifier (NPI) is 1669437414, issued on Apr 17, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John J. Messmer, MD located?
The NPPES record lists a practice address at 941 Park Dr, Palmyra, PA, 17078. Phone: (800) 233-4082. Providers update this record themselves, so call before visiting.
How can I verify John J. Messmer, MD's license?
NPPES lists Pennsylvania license number MD020821E, 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. Messmer, MD prescribe under Medicare Part D?
In 2024, John J. Messmer, MD had 6,888 Medicare Part D claims for 486 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
What is John J. Messmer, MD's MIPS final score?
The 2023 MIPS final score is 71.8 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.