DR. MARIN I MARCU M.D.
NPI 1295795722
Internal Medicine - Gastroenterology in Saint Charles, MO

Q: What is Marin Marcu's NPI number?

The NPI number for Marin Marcu is 1295795722. It was assigned to this individual provider in the NPPES registry on March 27, 2006.

Q: What is Marin Marcu's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Q: When was this NPI record last updated?

The NPPES record for Marin Marcu was last updated on November 20, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since March 27, 2006PECOS EnrolledAccepts Medicare Assignment

400 1ST CAPITOL DR, SUITE 201, SAINT CHARLES, MO 63301(636) 669-2332(636) 669-2401 Get Directions Write a Review

NPPES record last updated: November 20, 2020. Verified against the NPPES registry weekly; last sync: October 18, 2026.

On this page

About Dr. Marin I Marcu M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MARIN I MARCU M.D. (NPI 1295795722) is an individual gastroenterology provider in Saint Charles, Missouri, licensed in Missouri (103437) and active in the NPI registry since March 2006. He is enrolled in Medicare PECOS, is affiliated with Ssm St Joseph Health Center, and is a graduate of Other (1986).

NPPES Registry Identity

NPI1295795722

Entity TypeIndividualMale

Primary Taxonomy207RG0100X

Provider Legal NameDR. MARIN I MARCUCredential: M.D.

Location Address400 1ST CAPITOL DR, SUITE 201Saint Charles, MO 63301-2880

Mailing AddressPo Box 955534Saint Louis, MO 63195-5534

Phone(636) 669-2332

Fax(636) 669-2401

Sole ProprietorNo

Medical School CMSOtherGraduated 1986

Enumeration DateMarch 27, 2006

Last NPPES UpdateNovember 20, 2020

NPPES CertifiedNovember 20, 2020

✔ NPI 1295795722 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians

Taxonomy Code207RG0100X

License✔ Licensed in MO · 103437

Definition

An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.

400 1ST CAPITOL DR, Saint Charles, MO 63301

Open in Google Maps ↗

Other Identifiers 1

Medicaid205337207MO

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arkansas Health & Wellness, Ambetter from Sunflower Health Plan, Ambetter Health and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Marin I Marcu M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID5597656496

PECOS Enrollment IDI20100723000302

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Marin Marcu reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Ssm Medical Group, Inc.

14 mi

Clinic/Center

1101 HIGHWAY K STE A
O Fallon, MO 63366

Reassigned Medicare billing, Missouri enrollment
697 clinicians in this Medicare group

NPI 1851896146 (844) 766-7200

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 16

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232

Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.

307 services100 patients

Removal of polyps or growths of large bowel using a flexible endoscope with electrical cautery 45384

This procedure involves using a flexible tube with a camera, called an endoscope, to view the large intestine. If any abnormal growths or polyps are found, they are removed with an electrically-heated instrument. This is a common way to prevent bowel issues.

190 services189 patients

Removal of polyps or growths of large bowel using an endoscope with mechanical snare 45385

This procedure involves using a thin, flexible tube called an endoscope to examine the large bowel. If any abnormal growths or polyps are found, a tool called a mechanical snare is used to remove them. This is a common method to prevent potential health issues.

178 services176 patients

Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope 43239

This procedure involves using a thin, flexible tube with a light and camera, known as an endoscope, to examine the esophagus, stomach, and upper part of the small intestine. Small tissue samples are taken for further examination to help diagnose various conditions.

140 services122 patients

Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223

Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.

88 services83 patients

Insertion of guide wire with dilation of esophagus using a flexible endoscope 43248

This is a procedure where a thin tube, called an endoscope, is gently passed through your mouth into your esophagus. A guide wire is then inserted to help widen any narrow areas. This helps improve swallowing and reduce discomfort.

53 services42 patients

Colorectal cancer screening; colonoscopy on individual at high risk G0105

Colorectal cancer screening, specifically a colonoscopy, is a preventive measure for those at high risk. A thin, flexible tube with a camera inspects the colon to spot any abnormal growths. This test helps detect potential issues early, enhancing the effectiveness of treatment.

44 services44 patients

Removal of polyps or growths of esophagus, stomach, and/or upper small bowel using an endoscope with mechanical snare 43251

This procedure involves the use of a thin, flexible instrument called an endoscope to visualize and remove abnormal growths, known as polyps, from the esophagus, stomach, or upper small bowel. A tool called a mechanical snare is used to safely cut and remove these growths.

34 services31 patients

Biopsy of large bowel using a flexible endoscope 45380

A biopsy of the large bowel using a flexible endoscope is a procedure where a thin, flexible tube with a camera is inserted through the rectum to examine the bowel. If abnormal tissue is found, a small sample is taken for further examination. This helps in diagnosing conditions like inflammation, polyps, or cancer.

26 services26 patients

Biopsy of gallbladder, pancreatic, liver, and bile ducts using a flexible endoscope 43261

This procedure involves using a flexible tube, called an endoscope, to examine and take small tissue samples from your gallbladder, pancreas, liver, and bile ducts. These samples can help diagnose various conditions.

24 services17 patients

Removal of stone or debris from bile or pancreatic duct using a flexible endoscope 43264

This procedure, called an endoscopic retrograde cholangiopancreatography (ERCP), involves using a flexible tube with a camera (endoscope) to locate and remove stones or debris from your bile or pancreatic duct. It's a non-surgical method to clear the ducts, enhancing your digestive health.

20 services14 patients

Biopsy of small bowel (except ileum) using an endoscope 44361

A small bowel biopsy involves using a thin, flexible tube called an endoscope to examine the small intestine and take a small tissue sample. This sample is then examined under a microscope for any abnormalities. It's a safe, minimally invasive procedure.

20 services19 patients

Review by radiologist of image from tube placement into bile duct using an endoscope 74328

This procedure involves a specialist, called a radiologist, examining an image taken during a tube placement into your bile duct. The tube is inserted with the help of a tool called an endoscope. This allows the doctor to check for any issues or abnormalities in your bile duct.

20 services14 patients

Imaging of digestive tract done from the inside of the digestive tract 91110

This procedure, known as an endoscopy, involves a small camera being passed into the digestive tract. It helps doctors to see the inside of your digestive system in detail. This can aid in diagnosing conditions or planning treatments. It's generally safe and can provide valuable information.

17 services16 patients

Injection beneath lining of large bowel using a flexible endoscope 45381

This procedure involves a flexible tube, called an endoscope, being inserted into the large bowel. A small needle is then passed through the tube to inject medication under the bowel lining. This is typically done to treat inflammation or bleeding.

15 services15 patients

Diagnostic exam of large bowel using a flexible endoscope 45378

This procedure, known as a colonoscopy, involves using a flexible tube with a light and camera to examine the large intestine. It helps detect any abnormalities such as polyps or inflammation. It's a standard procedure to ensure gut health.

11 services11 patients

Hospital Affiliations CMS Care Compare 4

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Ssm St Joseph Health Center

Acute Care Hospitals · Saint Charles, MO

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number260005

Location300 1st Capitol DrSaint Charles, MO 63301 · St. Charles County

Emergency services

Ssm Health Depaul Hospital St Louis

Acute Care Hospitals · Bridgeton, MO

2/5 CMS rating

OwnershipVoluntary non-profit - Church

CMS Certification Number260104

Location12303 Depaul DriveBridgeton, MO 63044 · St. Louis County

Emergency services Birthing friendly

Ssm Health Saint Louis University Hospital

Acute Care Hospitals · Saint Louis, MO

1/5 CMS rating

OwnershipVoluntary non-profit - Church

CMS Certification Number260105

Location3635 Vista AveSaint Louis, MO 63110 · St. Louis City County

Emergency services

Ssm St Joseph Hospital West

Acute Care Hospitals · Lake Saint Louis, MO

3/5 CMS rating

OwnershipVoluntary non-profit - Church

CMS Certification Number260200

Location100 Medical PlazaLake Saint Louis, MO 63367 · St. Charles County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63301 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$128.28 typical visit price

range $55.65 – $169.38

Typical copayment $32.07 (range $13.91 – $42.34)

Most-billed visit code 99204

Established Patient

$98.37 typical visit price

range $17.76 – $137.92

Typical copayment $24.59 (range $4.44 – $34.48)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MRS. SHANNON M LAYTON P.T.

Physical Therapist

400 1ST CAPITOL DR, SUITE 101
SAINT CHARLES, MO 63301

St. Charles County (636) 947-5467

CHRISTINA JEANETTE GAUT FNP

Nurse Practitioner (Family)

400 1ST CAPITOL DR, SUITE 301
SAINT CHARLES, MO 63301

St. Charles County (636) 669-3080

DR. MICHELE A WOOD D.O.

Psychiatry & Neurology (Neurology)

400 1ST CAPITOL DR
SAINT CHARLES, MO 63301

St. Charles County (636) 946-1152

SSM CARDIOVASCULAR AND THORACIC SERVICES, INC.

Thoracic Surgery (Cardiothoracic Vascular Surgery)

400 1ST CAPITOL DR, SUITE 301
SAINT CHARLES, MO 63301

St. Charles County (314) 647-8269

DR. MIN PAN M.D.

Psychiatry & Neurology (Neurology)

400 1ST CAPITOL DR, SUITE 407
SAINT CHARLES, MO 63301

St. Charles County (636) 946-1152

CONSULTATIVE CARDIOLOGY, LLC

Internal Medicine (Cardiovascular Disease)

400 1ST CAPITOL DR
SAINT CHARLES, MO 63301

St. Charles County (636) 724-6433

DR. THOMAS A SCHNEIDER II M.D.

Surgery

400 1ST CAPITOL DR
SAINT CHARLES, MO 63301

St. Charles County (636) 940-5710

MARTIN P. ALTMAN M.D.

Internal Medicine (Gastroenterology)

400 1ST CAPITOL DR, SUITE 201
SAINT CHARLES, MO 63301

St. Charles County (636) 669-2332

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Marin Marcu's NPI number?

The NPI number for Marin Marcu is 1295795722. It was assigned to this individual provider in the NPPES registry on March 27, 2006.

Where is Marin Marcu located?

Marin Marcu practices at 400 1st Capitol Dr Suite 201, Saint Charles, MO 63301. The listed phone number is (636) 669-2332.

What is Marin Marcu's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Is Marin Marcu enrolled in Medicare?

Yes. Marin Marcu is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Marin Marcu's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Marin Marcu reassigns Medicare benefits to Ssm Medical Group, Inc. (O Fallon, MO). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Marin Marcu's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Marin Marcu accept?

Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from Arkansas Health & Wellness, Ambetter from Sunflower Health Plan and Ambetter of Oklahoma and 4 other insurers list Marin Marcu as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Marin Marcu affiliated with any hospitals?

According to CMS data, Marin Marcu is affiliated with Ssm St Joseph Health Center, Ssm Health Depaul Hospital St Louis, Ssm Health Saint Louis University Hospital and Ssm St Joseph Hospital West.

When was this NPI record last updated?

The NPPES record for Marin Marcu was last updated on November 20, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.