Mark Koshar, M.D.
Internal Medicine Physician · Easton, PA
Mark Koshar, M.D. is an internal medicine physician with a practice address in Easton, Pennsylvania, and NPI 1538161963, issued on Aug 15, 2005. Check the license (Pennsylvania MD016576E, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- Mark Koshar
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MD016576E PA
Self-reported in NPPES; status is on the state search - Practice location
- 3735 Nazareth RD, Easton, PA 18045
- Phone
- (610) 829-2200
- Enumerated
- Aug 15, 2005
- Record last updated
- Mar 2, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (610) 829-2211
- Medicaid ID
- 0006859310004 PA
- Medicare enrollment
- Enrolled (PECOS I20070404000179); accepts Medicare assignment
- Medical or professional school
- Rutgers New Jersey Medical School, 1974
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,300 in Pennsylvania → Look up another NPI →
Also registered at 3735 Nazareth RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Anthony Amoroso, M.D.Internal Medicine Physician1144222555
- Isabelita Annulysse, CRNPFamily Nurse Practitioner1720230337
- Mark Auerbach, MDInternal Medicine Physician1811999220
- James Balshi, MDVascular Surgery Physician1164466546
- Rahul Bhagat, M.D.Internal Medicine Physician1205122280
- Thomas Brandt, MDDiagnostic Radiology Physician1124061171
Verify Mark Koshar in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license MD016576ECheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.6 times the Medicare Part D claims of the average internal medicine physician in 2024
11,514 Medicare Part D claims for 701 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 179 claims were for opioids.
Most prescribed
- Amlodipine Besylate806 claims
- Atorvastatin Calcium726 claims
- Levothyroxine Sodium510 claims
- Simvastatin502 claims
- Losartan Potassium373 claims
- Alprazolam272 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.
Industry payments in 2024: $152.99
3 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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
- Lehigh Valley Physician GroupAllentown, PA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Koshar among 7,300 internal medicine physician records in Pennsylvania
Mark Koshar, M.D. 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 91% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated1974 · median 2008 among the 4,208 with a school on file
- Record last updated2016 · 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).
104 internal medicine physician records list a practice address in Easton
They are 104 of the 1,535 NPPES records with a practice address in Easton, and 7,300 internal medicine physician records in Pennsylvania.
All 7,300 in Pennsylvania → Every provider in Easton → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Anthony Amoroso, M.D.Easton, PA 180451144222555
- Mark Auerbach, MDEaston, PA 180451811999220
- Suzette Barreto, MDEaston, PA 180451285617217
- Maria Figueras, MDEaston, PA 180451942408190
- Pramila Gupta, M.D.Easton, PA 180451023010469
- Harvey Hakim, M.D.Easton, PA 180451740282169
- Vikin Lalan, M.D.Easton, PA 180451750693834
- Bharat Mehta, MDEaston, PA 180451033104484
Common questions
What is Mark Koshar, M.D.'s NPI number?
Mark Koshar, M.D.'s National Provider Identifier (NPI) is 1538161963, issued on Aug 15, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Mark Koshar, M.D. located?
The NPPES record lists a practice address at 3735 Nazareth RD, Easton, PA, 18045. Phone: (610) 829-2200. Providers update this record themselves, so call before visiting.
How can I verify Mark Koshar, M.D.'s license?
NPPES lists Pennsylvania license number MD016576E, 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 Mark Koshar, M.D. prescribe under Medicare Part D?
In 2024, Mark Koshar, M.D. had 11,514 Medicare Part D claims for 701 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.