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Edit this profileAt a glance
- 100 E Lancaster Ave, Suite 330 Lankenau Mob West, Wynnewood, PA 19096
About Dr. 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 specializing in colon & rectal surgery. According to Medicare claims data, John cared for 609 Medicare patients across 727 services. The services billed most often include established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more, diagnostic exam of lower portion of large bowel using a flexible endoscope, and established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more. NPI 1346212594 identifies this record in the national registry.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (610) 645-9093
- Email not available
Practice Locations
100 E LANCASTER AVE SUITE 330 LANKENAU MOB WEST
Wynnewood, PA 19096
Conditions Commonly Evaluated or Treated
Within Colon and Rectal Surgery generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
- Anal fissures
- Colon cancer
- Crohn's disease
- Diverticulitis
- Hemorrhoids
Anorectal conditions
- Anal fistula
- Rectal Ulcer
Anorectal disorders
- Anal Itching
- Anal Skin Tags
- Anal Stricture
- Perianal Hematoma
- Rectovaginal Fistula
Bowel disorders
- Bowel Blockage in Babies
- Chronic diarrhea
- Constipation From Pain Medicine
- Difficulty Emptying Bowels
- Severely Enlarged Colon
- Twisted Bowel
Bowel symptoms
- Constipation
- Diverticulosis
- Lower gastrointestinal bleeding
Cancer
- Anal cancer
- Appendix cancer
- Inherited Cancer Risk
- Precancerous Anal Cells
Colon conditions
- Inherited Colon Polyps
Digestive emergencies
Infections
Infections & cysts
Inflammatory bowel disease
- Radiation Proctitis
- Ulcerative colitis
Inflammatory conditions
- Rectal Inflammation
Ostomy & surgical complications
- Stoma Problems
Pain
- Rectal Pain
- Tailbone pain
Pelvic disorders
- Bowel Endometriosis
Pelvic floor & structure
Skin conditions
- Perianal Boils
Tumors & growths
Vascular & inflammatory
Procedures & services
Most searched procedures
- Bowel resection
- Colonoscopy
- Fistula repair
- Hemorrhoid removal
Abdominal surgery
- Appendectomy
- Bowel Adhesion Removal
Anorectal procedures
- Anal Dilation
Bowel management
- Transanal Irrigation
Cancer screening
Cancer surgery
- Complete Rectum and Anus Removal
- Heated Chemotherapy for Abdominal Cancer
- Low Anterior Resection
Diagnostic tests
- Endorectal Ultrasound
- J-Pouch Scope
- Rectal Exam with Scope
Diagnostics
- Defecography
- High-Resolution Anorectal Manometry
- High-Resolution Anoscopy
- Prostate Ultrasound
Digestive health
Endoscopy & minimally invasive
- Colon polyp removal
- Flexible sigmoidoscopy
- Transanal Minimally Invasive Surgery
Excision & drainage
- Anal Skin Tag Removal
- Anal Wart Removal
- Drainage of anal abscess
- Pilonidal cyst surgery
Fistula procedures
- Seton Drain Placement
Hemorrhoid treatments
- Hemorrhoid Injections
- Laser Hemorrhoid Treatment
- Rubber-band ligation of hemorrhoids
Inflammatory bowel surgery
- Bowel-Sparing Surgery for Crohn's
Injections & pain relief
- Anal Sphincter Botox
Minimally invasive surgery
- Robotic Colon Surgery
Ostomy surgery
- Colostomy Placement
- Ileostomy Surgery
- Parastomal Hernia Repair
- Stoma Revision
Pelvic floor & prolapse
Pelvic therapy
- Pelvic Biofeedback Therapy
Reconstructive surgery
- Anal Sphincter Repair
- J-Pouch Surgery
- Ostomy reversal
- Rectovaginal Fistula Repair
Therapy & rehabilitation
Procedures Most Often Billed to Medicare
727 services · 609 patients · 14 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Diagnostic exam of lower portion of large bowel using a flexible endoscope | Procedure | 45330 |
124 | More than most peers in Colorectal Surgery (Proctology) |
| Biopsy of large bowel using a flexible endoscope | Procedure | 45380 |
67 | More often than most peers in Colorectal Surgery (Proctology) |
| Diagnostic exam of large bowel using a flexible endoscope | Procedure | 45378 |
26 | More often than most peers in Colorectal Surgery (Proctology) |
| Removal of polyps or growths of large bowel using an endoscope with mechanical snare | Procedure | 45385 |
24 | As often as other peers in Colorectal Surgery (Proctology) |
| Diagnostic exam of anus using an endoscope | Procedure | 46600 |
20 | Less often than most peers in Colorectal Surgery (Proctology) |
| Biopsy of lower large bowel using a flexible endoscope | Procedure | 45331 |
15 | Too few peers to compare |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
132 | More often than most peers in Colorectal Surgery (Proctology) |
| 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 | More than most peers in Colorectal Surgery (Proctology) |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
71 | More often than most peers in Colorectal Surgery (Proctology) |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | Office visit | 99232 |
70 | More often than most peers in Colorectal Surgery (Proctology) |
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 — 15 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 7
Providers in PA who bill this service to Medicare most often.
Common questions
What does Dr. Marks specialize in?
Dr. Marks is a colorectal surgery (proctology) in Wynnewood, PA. That is the designation recorded for this NPI in the federal registry.
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. Contact the office directly to confirm availability and scheduling.
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 practicing?
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.
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