John H. Marks, MD
NPI 1346212594ActiveIndividual· Colon & Rectal Surgery· Wynnewood, PA
Colon & Rectal Surgery (MD) in Wynnewood, Pennsylvania, trained at Jefferson Medical College of Thomas Jefferson University (class of 1989). 370 Medicare patients in 2024, $154,653 paid; nearly all of their 153 Part D prescriptions were generic (99%). Vascular Technology, Inc. was the largest of 12 companies reporting payments in 2025, $44,911 in all, mostly consulting fees.
Overview
| NPI | 1346212594 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Feb 2, 2006 |
| Last updated in NPPES | Oct 21, 2015 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Colon & Rectal Surgery Primary | 208C00000X | MD046073L | PA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Colorectal Surgery (Proctology) (PA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 370 |
|---|---|
| Services billed | 883 across 74 procedure codes |
| Paid by Medicare | $154,653 |
Part D prescriptions in 2024
| Prescriptions (claims) | 153 · 180 30-day fills |
|---|---|
| Patients | 86 |
| Total drug cost | $6,465 |
| Generic share | 99% of claims |
Education and affiliations
| Medical school | Jefferson Medical College of Thomas Jefferson University |
|---|---|
| Graduation year | 1989 |
| Medicare specialty | Colorectal Surgery (Proctology) |
Medical group
- Main Line HealthcareWynewood, PA · 1,184 clinicians
Hospital affiliations
- Bryn Mawr HospitalBryn Mawr, PA
- Main Line Hospital LankenauWynnewood, PA
- Paoli HospitalPaoli, PA
Other facilities
- Main Line Health Home Care & Hospice - Home HealthHome health agency · Radnor, PA
Industry payments (Open Payments)
- 2025$44,911 · 51 payments from 12 companies
- 2024$27,906 · 44 payments from 15 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Vascular Technology, Inc. | $12,000 | 12 |
| Arthrex, Inc. | $11,890 | 1 |
| Intuitive Surgical, Inc. | $11,584 | 19 |
| Stryker Corporation | $7,175 | 3 |
| Medtronic, Inc. | $1,795 | 3 |
What the 2025 payments were for
- Consulting Fee$30,890 · 15 payments
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$7,590 · 3 payments
- Education$4,000 · 4 payments
- Travel and Lodging$1,346 · 8 payments
- Food and Beverage$1,085 · 21 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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