J Robot Surg
Anastomosis, SurgicalColectomyColonic Neoplasms
Dr. John H. Marks, MD
NPI1346212594PAC ID3274658877
- Medicare services, 2024
- 727
- Medicare patients, 2024
- 370
- Part D claims, 2024
- 153
- Publications
- 10
- Clinical trials
- 2
- Practice address
- 100 E Lancaster Ave, Wayne, PA 19087
- Practice phone
- Call (610) 645-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Lankenau Medical Center
Wayne, Pennsylvania
Find Dr. Marks' professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. John H. Marks is a colorectal surgeon in Wayne, Pennsylvania
Dr. Marks practices at Lankenau Medical Center in Wayne, Pennsylvania.
Dr. Marks' NPI, 1346212594, was assigned on February 2, 2006. Dr. Marks graduated from Sidney Kimmel Medical College in 1989. Dr. Marks holds Pennsylvania license MD046073L.
NPI and contact details
- NPI
- 1346212594NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3274658877
- NPI enumeration date
- February 2, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (610) 645-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 63
- Medical school graduation
- 1989
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John H. Marks practices at Lankenau Medical Center in Wayne, Pennsylvania
Dr. Marks' primary practice is Lankenau Medical Center, at 100 E Lancaster Ave, Wayne, PA 19087 in Delaware County. The practice phone is (610) 645-2000.
- Lankenau Medical Center100 E Lancaster Ave, Wayne, PA 19087 · Delaware CountyPhone(610) 645-2000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. John H. Marks is affiliated with 5 sites of care and 1 medical group
Dr. Marks' primary practice is Lankenau Medical Center in Wayne, Pennsylvania. Dr. Marks is also affiliated with Lankenau Medical Center. The medical group on file is Main Line Health. Dmand AI also links Dr. Marks to 2 more hospitals and 1 home health agency, each named with a free account.
Lankenau Medical CenterPrimary
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. John H. Marks' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Marks practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Lankenau Medical Center | Available with a free account |
| +4 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John H. Marks is one of 114 colorectal surgeons in Pennsylvania
Colon and rectal surgery is Dr. Marks' primary specialty in the NPI Registry, under taxonomy code 208C00000X. Dr. Marks is board certified in colon & rectal surgery by the American Board of Colon and Rectal Surgery. Dmand AI has Dr. Marks' licenses on file in 2 states: Pennsylvania and Michigan.
Specialties and state licenses
- Colon and rectal surgery, PennsylvaniaPrimary
- Michigan license
Clinical focus
Dmand AI lists colonoscopy, colon removal, gastrointestinal obstruction and hemorrhoids among the conditions Dr. Marks treats.
Colorectal surgeons near Dr. Marks
Counts of colorectal surgeons with a Dmand AI profile, by place and practice. Each opens the list.
114colorectal surgeons in Pennsylvania
3colorectal surgeons in Wayne
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. John H. Marks billed Medicare for 727 services in 2024
CMS data shows 727 Medicare services from Dr. Marks across 14 procedure codes in 2024, for 370 Medicare patients. Medicare paid $82,722 for them.
Medicare services, 2024727
Medicare patients370
Paid by Medicare$82,722
Procedure codes14
Dr. Marks' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 4782024: 4516%
- Surgery
- 2023: 3062024: 27610%
- Other services
- 2023: 212024: 0100%
Where Dr. Marks' Medicare services took place, 2024
- In an office52672%
- In a facility20128%
Dr. Marks compared with the Pennsylvania median for colorectal surgeons, 2024
- Dr. Marks
- Pennsylvania median
- Medicare services
- 727vs 3002.4 times
- Medicare patients
- 370vs 20878% above
- Part D claims
- 91vs 848% above
Medians across 111 colorectal surgeons in Pennsylvania with Dmand AI profiles that report each measure.
Dr. Marks' most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Marks?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Marks and other colorectal surgeons in Pennsylvania.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John H. Marks treated 370 Medicare patients in 2024, average age 74
CMS counts 370 Medicare patients who saw Dr. Marks in 2024. The largest group is 65 to 74, with 197 patients. 75% of them have high cholesterol, and 69% have high blood pressure. 3% are also on Medicaid. Their average risk score is 1.22, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Marks' median patient age at 67, with 53% women.
Medicare patients, 2024370
Average age74
Average risk score1.22
Also on Medicaid3%
Dr. Marks' Medicare patients by age, 2024
Dr. Marks' Medicare patients by sex, 2024
- Women21057%
- Men16043%
Chronic conditions among Dr. Marks' Medicare patients, 2024
- High cholesterol75%
- High blood pressure69%
- Arthritis51%
- Cancer45%
- Ischemic heart disease34%
- Anxiety28%
- Osteoporosis24%
- Chronic kidney disease21%
Share of Medicare patients with each condition. A patient can have several.
Dr. Marks' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 67
Patient panel by sex, all payers
- Women53%
- Men46%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John H. Marks wrote 153 Medicare Part D claims in 2024
In 2024, Dr. Marks wrote 153 Medicare Part D claims for 86 patients. 99% of them were for generic drugs. CMS names the drug for 91 of them, across 2 drugs with 11 or more claims each, at $517 in total drug cost. In 2023, CMS named 103 claims across 2 drugs.
Part D claims, 2024153
Drugs named by CMS2
Total drug cost$517
Part D patients86
Dr. Marks' Part D claims by kind of drug, 2024
- Generic151 claims99%
- Brand-name and other2 claims1%
Dr. Marks' most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Marks' Part D claims, 2024
- Antibiotics65%100 of 153 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1032024: 9112%
Drugs named by CMS: 2 in 2024, 2 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. John H. Marks ranks in the 99th percentile for colonoscopy in Medicare
Dr. Marks accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 399 procedures of colonoscopy by Dr. Marks, more than 99% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Marks ranks in Medicare procedure volume
- Colonoscopy
- 99th percentile399 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. John H. Marks has 10 publications on record
Dmand AI links 10 papers to Dr. Marks, published from 2014 to 2022. The most frequent topics are Rectal Neoplasms, Colectomy and Adenocarcinoma. Dr. Marks has published most often in Dis Colon Rectum. Dr. Marks' most frequent co-authors are Joseph Lawrence Frenkel, MD, Anthony P. D'Andrea, MD and Christopher Edmund Greenleaf, MBA, MD.
Papers10
Years published2014 to 2022
Dr. Marks' papers by year, 2014 to 2022
Topics Dr. Marks writes about most
- Rectal Neoplasms
- Colectomy
- Adenocarcinoma
- Anal Canal
- Laparoscopy
- Length of Stay
- Neoadjuvant Therapy
- Postoperative Complications
Dr. Marks' most frequent co-authors
- Joseph Lawrence Frenkel, MD2 shared papers
- Anthony P. D'Andrea, MD1 shared paper
- Christopher Edmund Greenleaf, MBA, MD1 shared paper
Recent publications by Dr. Marks
AdenocarcinomaNeoadjuvant TherapyPostoperative Complications
ColectomyColonic DiseasesEquipment Design
Anal CanalColon, SigmoidOrgan Sparing Treatments
See who Dr. Marks researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Marks works with, so you can find a warm path to the right colorectal surgeons.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. John H. Marks has worked on 2 clinical trials
Dmand AI links Dr. Marks to 2 clinical trials. Conditions studied include Rectal Neoplasms, Rectal Prolapse and Diverticulitis.
Conditions in Dr. Marks' trials
- Rectal Neoplasms
- Rectal Prolapse
- Diverticulitis
- Rectal Diseases
Recent clinical trials with Dr. Marks
Feasibility and Safety of Single Port Robot in Colorectal Procedures (opens in a new tab)
Status unknown
Rectal ProlapseDiverticulitisSingle Port Robotic Colorectal Surgery
Maintenance Chemotherapy After Neoadjuvant Chemoradiation Therapy for Distal Rectal Cancer (opens in a new tab)
TerminatedPhase 2
Rectal NeoplasmsRectal Diseases5FU/Leucovorin
Sources: Dmand AI Research Linkage; and ClinicalTrials.gov (National Library of Medicine)
Dr. John H. Marks received $336,373 in industry payments from 2016 to 2025
CMS Open Payments shows 493 general payments to Dr. Marks from 66 drug and device companies from 2016 to 2025. Consulting fees make up the largest share, 32% of the total. Intuitive Surgical, Inc. paid the most, $94,995.
General payments to Dr. Marks by program year, 2016 to 2025
General payments to Dr. Marks by kind, 2016 to 2025
$336.4Kin total
- Consulting fees$104,99032%
- Ownership or investment$79,82024%
- Speaker and faculty fees$76,25023%
- Travel and lodging$26,2908%
- Other$38,49912%
Companies that paid Dr. Marks the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John H. Marks has 3 awards and honors on record
Dmand AI lists 3 awards for Dr. Marks.
Awards and honors for Dr. Marks
- Undated
- ACS Fellow
- Checkbook Top Doc
- Super Doc
Source: Dmand AI Professional Profile Data
Dr. John H. Marks graduated from Sidney Kimmel Medical College
Dr. Marks graduated from Sidney Kimmel Medical College in 1989. Dr. Marks is a member of ACS and SLS.
- Medical school
- Board certified in colon & rectal surgery
- Board certified in surgery
Source: Dmand AI Professional Profile Data
Dr. John H. Marks accepts plans from 7 insurance carriers
Dr. Marks is in network with 7 carriers, including Elevance, Blue Cross Blue Shield of Michigan and Cigna. Medicare plans come from the most carriers, 6. Check the plan with the practice before a visit.
- Elevance
- Blue Cross Blue Shield of Michigan
- Cigna
- Highmark
- HCSC
- Humana
- CMS Medicare
Plan types Dr. Marks accepts, by number of carriers
- Medicare6
- PPO6
- HMO4
- EPO2
- POS2
Source: Dmand AI Insurance Network Data
Sources for Dr. John H. Marks's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Clinical trials and co-investigators | Dmand AI Research LinkageClinicalTrials.gov (National Library of Medicine) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. John H. Marks
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. John H. Marks' NPI number?
Dr. John H. Marks' NPI number is 1346212594. It was assigned on February 2, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. John H. Marks?
Dr. John H. Marks is a colorectal surgeon in Wayne, Pennsylvania. The primary specialty in the NPI Registry is Colon & Rectal Surgery Physician (taxonomy code 208C00000X).
Where does Dr. John H. Marks practice?
Dr. Marks practices at 100 E Lancaster Ave, Wayne, PA 19087. Dr. Marks' primary practice is Lankenau Medical Center in Wayne, Pennsylvania. Dmand AI also links Dr. Marks to 2 hospitals and 1 home health agency.
What is Dr. John H. Marks' office phone number?
The practice phone on file for Dr. Marks is (610) 645-2000.
What is Dr. John H. Marks' medical license number?
Dr. Marks holds Pennsylvania license MD046073L, one of the licenses on file in 2 states.
Which states has Dr. John H. Marks been licensed in?
Dmand AI has state licenses on file for Dr. Marks in Pennsylvania (1991 to 2026) and Michigan (1994 to 2017).
Which hospitals is Dr. John H. Marks affiliated with?
Dr. Marks is affiliated with Lankenau Medical Center. Dmand AI links Dr. Marks to 2 more hospitals.
What medical group is Dr. John H. Marks part of?
Dr. Marks is linked to Main Line Health.
Does Dr. John H. Marks accept Medicare?
Yes. CMS data shows Dr. Marks billed Medicare for 727 services in 2024, and Dr. Marks accepts Medicare assignment.
How many Medicare patients does Dr. John H. Marks see?
CMS counts 370 Medicare patients who saw Dr. Marks in 2024, with an average age of 74.
Show 9 more questionsShow fewer questions
Is Dr. John H. Marks board certified?
Yes. Dr. Marks is board certified in colon & rectal surgery by the American Board of Colon and Rectal Surgery.
What services does Dr. John H. Marks bill to Medicare?
In 2024, Dr. Marks' most billed Medicare services were office visit, established patient (99213), surgery: digestive system (45330) and office visit, established patient (99215).
Where did Dr. John H. Marks go to medical school?
Dr. Marks graduated from Sidney Kimmel Medical College in 1989.
What drugs does Dr. John H. Marks prescribe most?
In 2024 Medicare Part D data, Dr. Marks' most prescribed drugs by claims were Doxycycline Hyclate and Dicyclomine HCl.
Has Dr. John H. Marks received payments from drug or device companies?
CMS Open Payments shows $336,373 in general payments to Dr. Marks from 66 companies from 2016 to 2025. The largest total came from Intuitive Surgical, Inc.
How long has Dr. John H. Marks been practicing?
Dr. Marks graduated from medical school in 1989, 37 years ago.
Does Dr. John H. Marks do research?
Dmand AI links 10 publications to Dr. Marks, published from 2014 to 2022. Dr. Marks has worked on 2 clinical trials.
Who does Dr. John H. Marks publish with?
Dr. Marks' most frequent co-authors are Joseph Lawrence Frenkel, MD (2 shared papers), Anthony P. D'Andrea, MD (1 shared paper) and Christopher Edmund Greenleaf, MBA, MD (1 shared paper).
What insurance does Dr. John H. Marks accept?
Dr. Marks is in network with 7 carriers, including Elevance, Blue Cross Blue Shield of Michigan and Cigna. Medicare plans come from the most carriers, 6. Check the plan with the practice before a visit.
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