Physician Profile
Unclaimed ProfileAbout MARKS
Based in Wynnewood, PA, John H Marks, MD is listed in the NPI registry under colorectal surgery (proctology). John graduated from Jefferson Medical College of Thomas Jefferson University in 1989. John is also listed as specialising in colon & rectal surgery.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Common questions
What does Dr. Marks specialise in?
Dr. Marks is a colorectal surgery (proctology) in Wynnewood, PA. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “COLORECTAL SURGERY (PROCTOLOGY)”.
NPI registry
Where is Dr. Marks located?
Dr. Marks is listed at 100 E LANCASTER AVE SUITE 330 LANKENAU MOB WEST, Wynnewood, PA 19096. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Marks's phone number?
The number on file is (610) 645-9093. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Marks's NPI number?
Dr. Marks's National Provider Identifier is 1346212594. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Marks go to medical school?
Dr. Marks attended Jefferson Medical College of Thomas Jefferson University, graduating in 1989. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Marks been practising?
Dr. Marks has 37 years experience. Calculated from a graduation year of 1989, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Marks do most often?
According to Medicare billing data, Dr. Marks performs procedures including diagnostic exam of lower portion of large bowel using a flexible endoscope, biopsy of large bowel using a flexible endoscope and diagnostic exam of large bowel using a flexible endoscope, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Marks confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Marks. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (610) 645-9093
- Email not available
Practice Locations
100 E LANCASTER AVE SUITE 330 LANKENAU MOB WEST
Wynnewood, PA 19096
Procedures Most Often Billed to Medicare
727 services · 609 patients · 14 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Diagnostic exam of lower portion of large bowel using a flexible endoscope | Procedure | 45330 |
124 |
| Biopsy of large bowel using a flexible endoscope | Procedure | 45380 |
67 |
| Diagnostic exam of large bowel using a flexible endoscope | Procedure | 45378 |
26 |
| Removal of polyps or growths of large bowel using an endoscope with mechanical snare | Procedure | 45385 |
24 |
| Diagnostic exam of anus using an endoscope | Procedure | 46600 |
20 |
| Biopsy of lower large bowel using a flexible endoscope | Procedure | 45331 |
15 |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
132 |
| Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more | Office visit | 99215 |
78 |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
71 |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | Office visit | 99232 |
70 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other colorectal surgery specialists in Wynnewood 2
Same specialty, same city.
Trained at Jefferson Medical College of Thomas Jefferson University 8
Other providers in the same specialty who trained at the same institution.
More connections — 16 related providers in 2 groups
Class of 1989 at Jefferson Medical College of Thomas Jefferson University 8
Providers who graduated from the same medical school in the same year.
Also performs Diagnostic exam of lower portion of large bowel using a flexible endoscope 8
Providers in PA who bill this service to Medicare most often.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.