Marin I. Marcu, M.D.
Gastroenterology Physician · Saint Charles, MO
Marin I. Marcu, M.D. is a gastroenterology physician with a practice address in Saint Charles, Missouri, and NPI 1295795722, issued on Mar 27, 2006. Check the license (Missouri 103437, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Marin I. Marcu
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 103437 MO
Self-reported in NPPES; status is on the state search - Practice location
- 400 1St Capitol Dr, Saint Charles, MO 63301
- Phone
- (636) 669-2332
- Enumerated
- Mar 27, 2006
- Record last updated
- Nov 20, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (636) 669-2401
- Medicaid ID
- 205337207 MO
- Medicare enrollment
- Enrolled (PECOS I20100723000302); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 414 in Missouri → Look up another NPI →
Also registered at 400 1St Capitol Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Martin Altman, M.D.Gastroenterology Physician1437110491
- Kimberly Cockrell, NPFamily Nurse Practitioner1649648890
- Christina Gaut, FNPFamily Nurse Practitioner1063091387
- Ahmareen Khan, M.D.Pulmonary Disease Physician1669449591
- Shannon Layton, P.T.Physical Therapist1043326812
- Charles Linsenmeyer, M.D.Orthopaedic Surgery Physician1477556405
Verify Marin I. Marcu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license 103437Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
72% more Medicare Part D claims than the average gastroenterology physician in 2024
1,398 Medicare Part D claims for 831 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 27% of claims.
Most prescribed
- Peg 3350-Electrolyte441 claims
- Pantoprazole Sodium303 claims
- Omeprazole99 claims
- Sod Sulf-Potass Sulf-Mag Sulf96 claims
- Sucralfate82 claims
- Sutab66 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: $14.89
1 payment: food and beverage; the largest payer was Fujifilm Healthcare Americas Corporation. The 13,350 providers of this specialty with any payment received $5,015.95 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
- Ssm Medical Group IncSaint Charles, MO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Marin I. Marcu among 414 gastroenterology physician records in Missouri
Marin I. Marcu, M.D. is one of 414 gastroenterology physician records with a practice address in Missouri. 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 14% of them.
- NPI issued2006 · 14% of these records are older, 47% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 73% of these records are
- Graduated1986 · median 2003 among the 303 with a school on file
- Record last updated2020 · 47% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Missouri
There are 414 gastroenterology physician records in Missouri.
All 414 in Missouri → Every provider in Saint Charles → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Martin Altman, M.D.Saint Charles, MO 633011437110491
- Hari Diwakaran, M.D.Saint Charles, MO 633011285694703
- Lawrence Tierney, M.D.Saint Charles, MO 633011053440222
- David Westrich, MDSaint Charles, MO 633011679927230
- Mohhamed Omran, MDLake St Louis, MO 633671861592925
- James Petersen, M.D.Lake St Louis, MO 633671831169275
- Kamran Qureshi, MDLake St Louis, MO 633671417119926
- Joseph Rodemann, MDLake St Louis, MO 633671730101874
Common questions
What is Marin I. Marcu, M.D.'s NPI number?
Marin I. Marcu, M.D.'s National Provider Identifier (NPI) is 1295795722, issued on Mar 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Marin I. Marcu, M.D. located?
The NPPES record lists a practice address at 400 1St Capitol Dr, Saint Charles, MO, 63301. Phone: (636) 669-2332. Providers update this record themselves, so call before visiting.
How can I verify Marin I. Marcu, M.D.'s license?
NPPES lists Missouri license number 103437, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Marin I. Marcu, M.D. prescribe under Medicare Part D?
In 2024, Marin I. Marcu, M.D. had 1,398 Medicare Part D claims for 831 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.