Active NPI 1346212594 Individual Practitioner Male Practitioner

Dr. John H Marks , MD

Colon & Rectal Surgery • Wynnewood, PA

✓ Accepts Medicare Assignment

Professional Overview & Biography Verified Profile Summary

Dr. John Marks, MD is a certified Colon & Rectal Surgery practicing in Wynnewood, PA. With approximately 37 years of clinical experience since graduating from Jefferson Medical College Of Thomas Jefferson University in 1989, Dr. Marks delivers high-quality medical care to the local community at 100 E LANCASTER AVE.

Dr. Marks is affiliated with Main Line Healthcare and accepts Medicare assignment.

Frequently performed procedures and clinical services include established patient outpatient office visit, diagnostic exam of lower portion of large bowel using a flexible endoscope, subsequent hospital care with moderate levelof medical decision making, if using time, at least. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

100 E Lancaster Ave
Suite 330 Lankenau Mob West

Wynnewood, PA 190963450

Telephone 6106459093

Fax 6106459476

Associated Practice Facility / Clinic

🏢 Old Man's Home Of Philadelphia Facility NPI 1033114707

Medicare Profile & Education

Medical School

Jefferson Medical College Of Thomas Jefferson University

Graduation Year

1989

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

In-Person Only

Specialty Benchmarks & Practice Insights

Comparative analytics for Colon & Rectal Surgery in Wynnewood, PA

Senior Veteran Specialist (>20 Yrs)

Practitioner Clinical Experience

37 Yrs +7.7 yrs vs City Avg

City Avg: 29.3 Yrs

State Avg: 25.6 Yrs

Regional Practice Density

5 Specialists

Practicing in Wynnewood, PA (126 Statewide)

Telehealth Adoption Rate

0.0% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount

68.0% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Marks (37 Years) 37 Yrs

Wynnewood Specialty Average (29.3 Years) 29.3 Yrs

Performed Procedures & Service Volume

Top Medicare Part B procedures performed by this practitioner

CMS Official Data (2024)

Reporting Year:

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes	132	109	$155.00	$92.78
45330 Diagnostic exam of lower portion of large bowel using a flexible endoscope	124	103	$400.00	$192.14
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	78	57	$340.00	$180.03
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	71	59	$235.00	$130.11
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	70	35	$155.00	$77.03
45380 Biopsy of large bowel using an endoscope	67	67	$1100.00	$156.25
99205 New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more	53	53	$490.00	$225.97
45378 Diagnostic exam of large bowel using a flexible endoscope	26	26	$896.15	$176.06
45385 Removal of polyps or growths of large bowel using an endoscope with mechanical snare	24	24	$1800.00	$245.81
46600 Diagnostic examination of the anus using an endoscope	20	16	$230.00	$121.74
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	17	17	$275.00	$114.60
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	16	16	$385.00	$172.01
45331 Biopsy of lower large bowel using a flexible endoscope	15	15	$500.00	$294.82
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	14	12	$220.00	$119.86

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes	157	129	$155.00	$93.70
45330 Diagnostic exam of lower portion of large bowel using a flexible endoscope	151	129	$400.00	$196.90
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	86	62	$321.40	$184.22
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	85	64	$235.00	$129.88
45380 Biopsy of large bowel using an endoscope	68	67	$1100.00	$155.90
99205 New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more	54	54	$465.93	$228.29
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	53	28	$146.51	$81.43
45378 Diagnostic exam of large bowel using a flexible endoscope	33	33	$1000.00	$187.26
45385 Removal of polyps or growths of large bowel using an endoscope with mechanical snare	28	28	$1800.00	$253.96
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	26	26	$258.08	$117.09
G0105 Colorectal cancer screening; colonoscopy on individual at high risk	21	21	$725.00	$189.03
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	17	17	$369.71	$173.13
44213 Partial release of large bowel and partial removal of large bowel using an endoscope	14	14	$520.00	$193.02
46600 Diagnostic examination of the anus using an endoscope	12	12	$230.00	$127.95

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes	204	146	$155.00	$95.90
45330 Diagnostic exam of lower portion of large bowel using a flexible endoscope	141	115	$400.00	$206.06
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	96	66	$300.00	$189.77
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	76	58	$235.00	$135.37
45380 Biopsy of large bowel using an endoscope	63	63	$1100.00	$149.41
99205 New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more	58	58	$425.00	$231.43
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	42	16	$140.00	$73.76
45378 Diagnostic exam of large bowel using a flexible endoscope	34	34	$1000.00	$189.27
45385 Removal of polyps or growths of large bowel using an endoscope with mechanical snare	32	32	$1800.00	$256.78
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	30	30	$235.00	$119.44
44213 Partial release of large bowel and partial removal of large bowel using an endoscope	19	19	$520.00	$200.67
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	19	19	$320.00	$177.46
G0105 Colorectal cancer screening; colonoscopy on individual at high risk	19	19	$725.00	$189.75
45331 Biopsy of lower large bowel using a flexible endoscope	15	14	$500.00	$305.99
G0121 Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk	14	14	$880.00	$194.56
46600 Diagnostic examination of the anus using an endoscope	13	13	$204.62	$134.78
44205 Partial removal of small and large bowel with attachment of small and large bowel using an endoscope	12	12	$3080.09	$1468.17

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes	201	153	$152.16	$98.24
45330 Diagnostic exam of lower portion of large bowel using a flexible endoscope	100	87	$400.00	$208.76
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	94	76	$229.89	$135.47
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	74	57	$285.08	$189.74
99205 New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more	57	57	$406.05	$236.54
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	55	18	$140.00	$76.27
45380 Biopsy of large bowel using an endoscope	50	50	$1100.00	$165.47
45385 Removal of polyps or growths of large bowel using an endoscope with mechanical snare	32	31	$1800.00	$255.96
G0105 Colorectal cancer screening; colonoscopy on individual at high risk	29	29	$725.00	$198.54
45378 Diagnostic exam of large bowel using a flexible endoscope	26	26	$1000.00	$183.56
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	25	25	$320.00	$175.71
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	22	22	$223.41	$121.75
46600 Diagnostic examination of the anus using an endoscope	17	17	$200.00	$135.78
44205 Partial removal of small and large bowel with attachment of small and large bowel using an endoscope	15	15	$3049.07	$1485.41
44625 Closure of large or small bowel opening with bowel removal and reattachment	14	14	$2709.00	$1113.16

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes	130	106	$150.00	$81.45
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	101	68	$276.00	$154.81
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	83	57	$223.17	$115.37
45330 Diagnostic exam of lower portion of large bowel using a flexible endoscope	72	62	$400.00	$194.41
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	53	23	$140.00	$78.11
99205 New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more	46	46	$385.00	$217.18
45380 Biopsy of large bowel using an endoscope	33	32	$1100.00	$166.87
45385 Removal of polyps or growths of large bowel using an endoscope with mechanical snare	25	25	$1815.84	$275.10
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	20	20	$320.00	$178.42
45378 Diagnostic exam of large bowel using a flexible endoscope	19	18	$1000.00	$173.52
99231 Follow-up hospital inpatient care per day, typically 15 minutes	18	12	$80.00	$42.46
G0105 Colorectal cancer screening; colonoscopy on individual at high risk	15	15	$725.00	$206.87
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	15	15	$220.00	$117.03
44213 Partial release of large bowel and partial removal of large bowel using an endoscope	13	13	$520.00	$211.62

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes	225	169	$150.00	$78.70
45330 Diagnostic exam of lower portion of large bowel using a flexible endoscope	119	103	$400.00	$188.33
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	117	84	$206.00	$114.50
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	107	74	$276.00	$154.86
45380 Biopsy of large bowel using an endoscope	65	64	$1103.72	$159.45
99205 New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more	57	57	$385.00	$211.94
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	52	20	$140.00	$77.71
45385 Removal of polyps or growths of large bowel using an endoscope with mechanical snare	36	36	$1800.00	$279.01
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	33	33	$220.00	$116.75
46600 Diagnostic examination of the anus using an endoscope	32	31	$185.94	$105.08
45378 Diagnostic exam of large bowel using a flexible endoscope	26	26	$1000.00	$208.03
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	24	24	$320.00	$176.67
99231 Follow-up hospital inpatient care per day, typically 15 minutes	20	11	$80.00	$42.13
45331 Biopsy of lower large bowel using a flexible endoscope	16	15	$500.00	$293.20
44205 Partial removal of small and large bowel with attachment of small and large bowel using an endoscope	13	13	$2825.00	$1507.06
44213 Partial release of large bowel and partial removal of large bowel using an endoscope	13	13	$520.00	$211.72
44207 Partial removal of large bowel and reattachment to rectum using an endoscope	12	12	$3845.00	$2045.18

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes	247	177	$142.11	$74.59
45330 Diagnostic exam of lower portion of large bowel using a flexible endoscope	151	129	$400.00	$177.41
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	120	89	$206.00	$109.60
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	109	78	$276.00	$148.30
99205 New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more	70	70	$372.14	$213.30
45380 Biopsy of large bowel using an endoscope	61	61	$1100.00	$177.76
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	39	39	$216.92	$111.82
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	37	18	$131.08	$74.59
45378 Diagnostic exam of large bowel using a flexible endoscope	35	35	$1000.00	$196.22
45385 Removal of polyps or growths of large bowel using an endoscope with mechanical snare	29	28	$1800.00	$267.52
46600 Diagnostic examination of the anus using an endoscope	28	25	$184.64	$94.19
99231 Follow-up hospital inpatient care per day, typically 15 minutes	24	11	$75.63	$40.24
44207 Partial removal of large bowel and reattachment to rectum using an endoscope	24	24	$3700.00	$1962.09
44213 Partial release of large bowel and partial removal of large bowel using an endoscope	20	20	$520.00	$203.05
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	13	13	$320.00	$169.58

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes	331	241	$138.52	$76.78
45330 Diagnostic exam of lower portion of large bowel using a flexible endoscope	185	163	$400.00	$180.36
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	122	97	$204.38	$112.85
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	91	71	$274.59	$152.68
45380 Biopsy of large bowel using an endoscope	73	72	$1100.00	$168.74
99205 New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more	66	66	$370.00	$218.56
45378 Diagnostic exam of large bowel using a flexible endoscope	52	52	$1000.00	$194.20
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	45	16	$130.00	$75.75
45385 Removal of polyps or growths of large bowel using an endoscope with mechanical snare	42	41	$1800.00	$270.24
46600 Diagnostic examination of the anus using an endoscope	37	32	$180.00	$96.08
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	29	29	$199.48	$114.94
44213 Partial release of large bowel and partial removal of large bowel using an endoscope	29	29	$520.00	$207.95
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	23	23	$316.52	$174.23
44207 Partial removal of large bowel and reattachment to rectum using an endoscope	21	21	$3700.00	$2003.98
44205 Partial removal of small and large bowel with attachment of small and large bowel using an endoscope	13	13	$2800.00	$1477.60
G0121 Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk	12	12	$880.00	$204.05

Medical Specialties & State Licenses

Colon & Rectal Surgery Primary Specialty

NUCC Taxonomy Code: 208C00000X

State License PA MD046073L

A colon and rectal surgeon is trained to diagnose and treat various diseases of the intestinal tract, colon, rectum, anal canal and perianal area by medical and surgical means. This specialist also deals with other organs and tissues (such as the liver, urinary and female reproductive system) involved with primary intestinal disease.

Hospital & Practice Group Affiliations

Main Line Healthcare

830 Old Lancaster Rd, Bryn Mawr, PA 190103118

Main Line Healthcare

100 E Lancaster Ave, Wynewood, PA 190963450

Practice Associates & Co-Workers

Healthcare professionals and specialists practicing at this location or sharing practice phone/fax

9 Associated Practitioners

Dr. Jonathan Josse , MD

Student in an Organized Health Care Education/Training Program

NPI 1104328996

Doctor of Medicine (M.D.)

Dr. Gerald Marks , MD

Colon & Rectal Surgery

NPI 1174595532

Doctor of Medicine (M.D.)

Dr. Lauren Kosinski , MD

Colon & Rectal Surgery

NPI 1184670721

Doctor of Medicine (M.D.)

Emily Prencipe , PA-C

Physician Assistant

NPI 1487431185

Physician Assistant (Certified)

Shelley Epstein , PA-C

Physician Assistant - Surgical

NPI 1528197241

Physician Assistant (Certified)

Meghan Hoerz , PA-C

Physician Assistant

NPI 1568121432

Physician Assistant (Certified)

Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

6 Historical Events

✅

NPI Profile Active October 21, 2015

NPI status registered as active in NPPES database

📍

Updated Practice Location October 21, 2015

Registered at 100 E LANCASTER AVE, SUITE 330 LANKENAU MOB WEST, WYNNEWOOD, PA 190963450 (Tel: 6106459093)

📍

Updated Business Mailing Address October 21, 2015

Registered at 100 E LANCASTER AVE, SUITE 330 LANKENAU MOB WEST, WYNNEWOOD, PA 190963450 (Tel: 6106459093)

👤

Provider Name / Credentials Updated October 21, 2015

Recorded as JOHN MARKS, MD

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) October 21, 2015

Colon & Rectal Surgery (License #MD046073L in PA)

🟢

Initial NPI Registration & Enumeration February 02, 2006

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

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NPI Administrative Meta

NPI Number: 1346212594

Entity Type:

Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)

Enumeration Date: February 02, 2006

Last Update: October 21, 2015

Sole Proprietor: No

Update or Correct Profile

Mailing Address

100 E Lancaster Ave, Suite 330 Lankenau Mob West

Wynnewood, PA 190963450

Phone: 6106459093

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).

⚠️ Medical Disclaimer

This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.