Dr. John H. Marks, MD
Colorectal Surgery (Colon & Rectal Surgery Physician)
100 E Lancaster Ave, Suite 330 Lankenau Mob West
Wynnewood, PA 19096
- Medicare participating
At a glance
- Medical school
- Jefferson Medical College of Thomas Jefferson University (1989)
- Years since graduation
- 37
- In the NPI registry since
- 2006
- Medicare patients seen, 2024
- 370
The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. NPIs were first issued in May 2005 and became required on claims in 2007–2008, so an early date usually means the clinician was already in practice before then. What an NPI is
Education and training
- 1989Medical school: Jefferson Medical College of Thomas Jefferson University
- 2006Registered with an NPI (national billing number; not a license date) — NPIs began in 2005, so practice likely started earlier
Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).
Specialties and state licenses
-
Colon & Rectal Surgery Physician primary
PA license MD046073L
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Main Line Hospital Lankenau Wynnewood, PA
- Paoli Hospital Paoli, PA
- Bryn Mawr Hospital Bryn Mawr, PA
Medical groups
- Main Line Healthcare (1,184 clinicians)
Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.
Medicare patients and services
- Medicare patients, 2024
- 370
- Services billed
- 883
- Patients’ average age
- 74
| Service | Times | Patients |
|---|---|---|
| Established patient office or other outpatient visit, 20-29 minutes | 157 | 129 |
| Diagnostic exam of lower portion of large bowel using a flexible endoscope | 151 | 129 |
| Established patient office or other outpatient visit, 40-54 minutes | 86 | 62 |
| Established patient office or other outpatient visit, 30-39 minutes | 85 | 64 |
| Biopsy of large bowel using a flexible endoscope | 68 | 67 |
| New patient office or other outpatient visit, 60-74 minutes | 54 | 54 |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 53 | 28 |
| Diagnostic exam of large bowel using a flexible endoscope | 33 | 33 |
| Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 28 | 28 |
| New patient office or other outpatient visit, 30-44 minutes | 26 | 26 |
Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.
Medicare prescriptions
| Drug | Prescriptions |
|---|---|
| Doxycycline Hyclate Other prescribers in Wynnewood, PA | 77 |
| Dicyclomine Hcl Other prescribers in Wynnewood, PA | 14 |
Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.
Payments from drug and device companies
In 2025, 12 companies reported 40 payments worth $44,911 in total to this clinician.
| Vascular Technology, Inc. | $12,000 |
|---|---|
| Arthrex, Inc. | $11,890 |
| Intuitive Surgical, Inc. | $11,584 |
| Stryker Corporation | $7,175 |
| Medtronic, Inc. | $1,795 |
| Ethicon US, LLC | $194 |
| Caris Mpi, Inc. | $121 |
| Incyte Corporation | $44.71 |
| Consulting Fee | $30,890 |
|---|---|
| Compensation for services other than consulting (speaking, faculty) | $7,590 |
| Education | $4,000 |
| Travel and Lodging | $1,346 |
| Food and Beverage | $1,085 |
What the payments were for
| Company | What it was for | Amount |
|---|---|---|
| Vascular Technology, Inc. Jan 2, 2025 | Consulting Fee | $12,000 |
| Arthrex, Inc. Feb 13, 2025 | Consulting Fee | $11,890 |
| Stryker Corporation Dec 11, 2025 | Consulting Fee 1788 · ENDOSCOPY | $5,000 |
| Intuitive Surgical, Inc. Aug 20, 2025 | Compensation for services other than consulting (speaking, faculty) Da Vinci Surgical System · SURGERY | $4,000 |
| Intuitive Surgical, Inc. Jun 25, 2025 | Compensation for services other than consulting (speaking, faculty) Da Vinci Surgical System · SURGERY | $2,000 |
| Stryker Corporation Nov 13, 2025 | Consulting Fee | $2,000 |
| Medtronic, Inc. Jun 26, 2025 | Compensation for services other than consulting (speaking, faculty) SIGNIA · Surgical Stapling | $1,590 |
| Intuitive Surgical, Inc. Dec 19, 2025 | Education Da Vinci Surgical System · SURGERY | $1,000 |
| Intuitive Surgical, Inc. Nov 7, 2025 | Education Da Vinci Surgical System · SURGERY | $1,000 |
| Intuitive Surgical, Inc. Dec 19, 2025 | Education Da Vinci Surgical System · SURGERY | $1,000 |
All 19 payments other than meals, newest first
| Company | What it was for | Amount |
|---|---|---|
| Intuitive Surgical, Inc. Dec 19, 2025 | Education Da Vinci Surgical System · SURGERY | $1,000 |
| Intuitive Surgical, Inc. Dec 19, 2025 | Education Da Vinci Surgical System · SURGERY | $1,000 |
| Stryker Corporation Dec 11, 2025 | Consulting Fee 1788 · ENDOSCOPY | $5,000 |
| Stryker Corporation Nov 13, 2025 | Consulting Fee | $2,000 |
| Intuitive Surgical, Inc. Nov 7, 2025 | Education Da Vinci Surgical System · SURGERY | $1,000 |
| Intuitive Surgical, Inc. Oct 28, 2025 | Education Da Vinci Surgical System · SURGERY | $1,000 |
| Intuitive Surgical, Inc. Aug 20, 2025 | Compensation for services other than consulting (speaking, faculty) Da Vinci Surgical System · SURGERY | $4,000 |
| Medtronic, Inc. Jun 26, 2025 | Compensation for services other than consulting (speaking, faculty) SIGNIA · Surgical Stapling | $1,590 |
| Intuitive Surgical, Inc. Jun 25, 2025 | Compensation for services other than consulting (speaking, faculty) Da Vinci Surgical System · SURGERY | $2,000 |
| Intuitive Surgical, Inc. May 13, 2025 | Travel and Lodging Da Vinci Surgical System · SURGERY · travel to SAN FRANCISCO, CA · in-kind | $165 |
| Intuitive Surgical, Inc. May 12, 2025 | Travel and Lodging Da Vinci Surgical System · SURGERY · travel to SAN FRANCISCO, CA · in-kind | $90.65 |
| Intuitive Surgical, Inc. May 12, 2025 | Travel and Lodging Da Vinci Surgical System · SURGERY · travel to SAN FRANCISCO, CA · in-kind | $74.25 |
| Intuitive Surgical, Inc. May 1, 2025 | Travel and Lodging Da Vinci Surgical System · SURGERY · travel to SANTA CLARA, CA · in-kind | $317 |
| Intuitive Surgical, Inc. May 1, 2025 | Travel and Lodging Da Vinci Surgical System · SURGERY · travel to SAN FRANCISCO, CA · in-kind | $19.00 |
| Intuitive Surgical, Inc. Apr 29, 2025 | Travel and Lodging Da Vinci Surgical System · SURGERY · travel to SAN FRANCISCO, CA · in-kind | $453 |
| Intuitive Surgical, Inc. Apr 29, 2025 | Travel and Lodging Da Vinci Surgical System · SURGERY · travel to SAN FRANCISCO, CA · in-kind | $208 |
| Intuitive Surgical, Inc. Apr 29, 2025 | Travel and Lodging Da Vinci Surgical System · SURGERY · travel to SAN FRANCISCO, CA · in-kind | $19.00 |
| Arthrex, Inc. Feb 13, 2025 | Consulting Fee | $11,890 |
| Vascular Technology, Inc. Jan 2, 2025 | Consulting Fee | $12,000 |
Each payment as the company reported it, with the products it named. Meals are counted in the totals above but not listed one by one.
From CMS Open Payments. A payment is not evidence of wrongdoing; many are for consulting, teaching or meals. Clinicians can review and dispute their records with CMS.