John H. Marks, MD
Colon & Rectal Surgery Physician · Wynnewood, PA
John H. Marks, MD is a colon & rectal surgery physician with a practice address in Wynnewood, Pennsylvania, and NPI 1346212594, issued on Feb 2, 2006. Check the license (Pennsylvania MD046073L, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- John H. Marks
- Credential
- MD
- Primary taxonomy
- Colon & Rectal Surgery Physician 208C00000X
- License number
- MD046073L PA
Self-reported in NPPES; status is on the state search - Practice location
- 100 E Lancaster Ave, Wynnewood, PA 19096
- Phone
- (610) 645-9093
- Enumerated
- Feb 2, 2006
- Record last updated
- Oct 21, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (610) 645-9476
- Medicare enrollment
- Enrolled (PECOS I20100920001097); accepts Medicare assignment
- Medical or professional school
- Jefferson Medical College Of Thomas Jefferson University, 1989
- Entity
- Type 1 · individual
8 nearest colon & rectal surgery physician records → All 122 in Pennsylvania → Look up another NPI →
Also registered at 100 E Lancaster Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Sandra Abramson, MDCardiovascular Disease Physician1275538282
- Olivia Ackley, MDInternal Medicine Physician1174453930
- Ashley Adams, CRNPWomen's Health Nurse Practitioner1497225635
- Bonnie Adelman, M.S.P.A.Audiologist1568718088
Verify John H. Marks in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license MD046073LCheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
20% fewer Medicare Part D claims than the average colon & rectal surgery physician in 2024
153 Medicare Part D claims for 86 beneficiaries, against an average of 192 among the 1,836 providers of this specialty who prescribed in Part D.
Most prescribed
- Doxycycline Hyclate77 claims
- Dicyclomine Hcl14 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $27,549.56
30 payments; by number, the most common kind was food and beverage; the largest payer was Vascular Technology, Inc. The 1,524 providers of this specialty with any payment received $3,468.16 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Main Line HealthcareWynewood, PA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John H. Marks among 122 colon & rectal surgery physician records in Pennsylvania
John H. Marks, MD is one of 122 colon & rectal surgery physician records with a practice address in Pennsylvania. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 20% of them.
- NPI issued2006 · 20% of these records are older, 45% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 75% of these records are
- Graduated1989 · median 2000 among the 91 with a school on file
- Record last updated2015 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208C00000X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Colon & Rectal Surgery Physician providers in Pennsylvania
There are 122 colon & rectal surgery physician records in Pennsylvania.
All 122 in Pennsylvania → Every provider in Wynnewood → Colon & Rectal Surgery Physician nationwide →
The 8 colon & rectal surgery physician records with the nearest ZIP codes
- Lauren Kosinski, MDWynnewood, PA 190961184670721
- Robert Noone, MDWynnewood, PA 190961881697845
- Henry Schoonyoung, M.D.Wynnewood, PA 190961578792461
- Robert Fry, MDPhiladelphia, PA 191041336171636
- Paul Hernandez, M.D.Philadelphia, PA 191041609261171
- Lillias Maguire, MDPhiladelphia, PA 191041063674562
- Najjia Mahmoud, MDPhiladelphia, PA 191041780614784
- Joshua Bleier, MDPhiladelphia, PA 191061124292487
Common questions
What is John H. Marks, MD's NPI number?
John H. Marks, MD's National Provider Identifier (NPI) is 1346212594, issued on Feb 2, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John H. Marks, MD located?
The NPPES record lists a practice address at 100 E Lancaster Ave, Wynnewood, PA, 19096. Phone: (610) 645-9093. Providers update this record themselves, so call before visiting.
How can I verify John H. Marks, MD's license?
NPPES lists Pennsylvania license number MD046073L, as entered by the provider. Search the Pennsylvania Department of State (PALS) at https://www.pals.pa.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John H. Marks, MD prescribe under Medicare Part D?
In 2024, John H. Marks, MD had 153 Medicare Part D claims for 86 beneficiaries; the average among colon & rectal surgery physician prescribers was 192. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.