Mark Koshar, M.D.
NPI 1538161963 · Internal Medicine Physician · Easton, PA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Koshar, M.D. is a Internal Medicine Physician provider in Easton, PA (NPI 1538161963).
Provider details
- NPI number
- 1538161963
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- MD016576E (PA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,939 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 592 | $121 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 351 | $122 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 311 | $86 |
| Administration of Influenza Virus VaccineG0008 | 237 | $31 |
| Admn Sarscov2 Vacc 1 Dose90480 | 130 | $41 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 97 | $13 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 152 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 806 | 214 |
| Atorvastatin Calcium | 726 | 202 |
| Levothyroxine Sodium | 510 | 122 |
| Simvastatin | 502 | 135 |
| Losartan Potassium | 373 | 100 |
| Alprazolam | 272 | 61 |
| Lisinopril | 265 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$153 across 3 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-08-15
- Last updated
- 2016-03-02
Frequently asked questions
- What is Mark Koshar's NPI number?
- Mark Koshar's National Provider Identifier (NPI) is 1538161963, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Koshar's specialty?
- Mark Koshar is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Koshar located?
- Mark Koshar's practice location on file with NPPES is 3735 Nazareth Rd, Easton, PA 18045-8338.
- What is Mark Koshar's phone number?
- The practice phone number listed in the NPPES registry for Mark Koshar is (610) 829-2200.
- Does Mark Koshar accept Medicare?
- Mark Koshar is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Koshar's NPI active?
- Yes — Mark Koshar's NPI (1538161963) is active in the NPPES registry as of the last update on 2016-03-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.