MICHAEL J ZEREGA MD
NPI 1073505178
Internal Medicine - Gastroenterology in Lake St Louis, MO

Q: What is Michael Zerega's NPI number?

The NPI number for Michael Zerega is 1073505178. It was assigned to this individual provider in the NPPES registry on August 16, 2005.

Q: What is Michael Zerega'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 Michael Zerega was last updated on April 2, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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 August 16, 2005PECOS EnrolledAccepts Medicare Assignment

200 BREVCO PLZ, SUITE 208, LAKE ST LOUIS, MO 63367(636) 561-9020(636) 561-6208 Get Directions Write a Review

NPPES record last updated: April 2, 2015. Verified against the NPPES registry weekly; last sync: October 25, 2026.

On this page

About Michael J Zerega Md NPPES

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

MICHAEL J ZEREGA MD (NPI 1073505178) is an individual gastroenterology provider in Lake St Louis, Missouri, licensed in Missouri (2000154596) and active in the NPI registry since August 2005. He is enrolled in Medicare PECOS, is affiliated with Mercy Hospital St Louis, and is a graduate of Washington University School Of Medicine (1997).

NPPES Registry Identity

NPI1073505178

Entity TypeIndividualMale

Primary Taxonomy207RG0100X

Provider Legal NameMICHAEL J ZEREGACredential: MD

Location Address200 BREVCO PLZ, SUITE 208Lake St Louis, MO 63367-2949

Mailing Address200 Brevco Plz, Suite 208Lake St Louis, MO 63367-2949 · (636) 561-9020 · Fax (636) 561-6208

Phone(636) 561-9020

Fax(636) 561-6208

Sole ProprietorNo

Medical School CMSWashington University School Of MedicineGraduated 1997

Enumeration DateAugust 16, 2005

Last NPPES UpdateApril 2, 2015

✔ NPI 1073505178 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 · 2000154596

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.

200 BREVCO PLZ, Lake St Louis, MO 63367

Open in Google Maps ↗

Other Identifiers 5

OtherP01015409MO · Railroad Medicare

Other18943Bc Bs Mo

Medicare UPINH78130

Medicare PINMA1838009MO

Medicaid1073505178MO

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

Michael J Zerega Md 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 ID42231250

PECOS Enrollment IDI20051215000647

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 Reassignments

Medicare enrollment records show Michael Zerega reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Mercy Hospitals East Communities

21 mi

Clinic/Center

615 S NEW BALLAS RD
Saint Louis, MO 63141

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

NPI 1851431738 (314) 251-6382

Mercy Clinic Gastroenterology, LLC

21 mi

Gastroenterology

621 S NEW BALLAS RD, SUITE 437-A
Saint Louis, MO 63141

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

NPI 1528295334 (314) 251-3880

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 12

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.

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.

131 services131 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

63 services50 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

57 services49 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.

43 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.

34 services34 patients

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

28 services28 patients

New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203

This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.

20 services20 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.

19 services19 patients

Study of esophagus to assess movement 91010

This procedure, known as esophageal manometry, involves studying the esophagus or food pipe to evaluate its movement and pressure. It helps understand how well the esophagus can move food to the stomach. Involving a thin, flexible tube, it's a safe, minimally invasive test.

15 services15 patients

Balloon dilation of esophagus, stomach, and/or upper small bowel using a flexible endoscope, less than 3.0 cm 43249

This procedure involves using a flexible tube with a camera, called an endoscope, to gently expand narrowed areas in your esophagus, stomach, or upper small bowel. A small balloon is inflated, making it easier for food and liquid to pass through. It's safe and effective.

14 services13 patients

Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk G0121

Colorectal cancer screening, such as a colonoscopy, is a preventive measure to detect early signs of cancer in the large intestine. For individuals not at high risk, it's typically recommended at age 50. A small, flexible tube with a camera is used to examine your colon. It's a safe, effective way to catch issues early.

14 services14 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

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.

Mercy Hospital St Louis

Acute Care Hospitals · Saint Louis, MO

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number260020

Location615 New Ballas RoadSaint Louis, MO 63141 · St. Louis County

Emergency services Birthing friendly

Mercy Hospital Washington

Acute Care Hospitals · Washington, MO

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number260052

Location901 East 5th StreetWashington, MO 63090 · Franklin County

Emergency services

Mercy Hospital South

Acute Care Hospitals · Saint Louis, MO

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number260077

Location10010 Kennerly RoadSaint Louis, MO 63128 · St. Louis County

Emergency services

Missouri Baptist Medical Center

Acute Care Hospitals · Town And Country, MO

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number260108

Location3015 N Ballas RdTown And Country, MO 63131 · St. Louis County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63367 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 3

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

TOTAL RENAL CARE INC

Clinic/Center (End-Stage Renal Disease (ESRD) Treatment)

200 BREVCO PLZ, STE 202
LAKE SAINT LOUIS, MO 63367

St. Charles County (636) 625-4460

DIGESTIVE DISEASE MEDICAL CONSULTANTS, PC

Internal Medicine (Gastroenterology)

200 BREVCO PLZ, SUITE 208
LAKE ST LOUIS, MO 63367

St. Charles County (636) 561-9020

JAMES H PETERSEN M.D.

Internal Medicine (Gastroenterology)

200 BREVCO PLZ, SUITE 208
LAKE ST LOUIS, MO 63367

St. Charles County (636) 561-9020

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 Michael Zerega's NPI number?

The NPI number for Michael Zerega is 1073505178. It was assigned to this individual provider in the NPPES registry on August 16, 2005.

Where is Michael Zerega located?

Michael Zerega practices at 200 Brevco Plz Suite 208, Lake St Louis, MO 63367. The listed phone number is (636) 561-9020.

What is Michael Zerega's specialty?

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

Is Michael Zerega enrolled in Medicare?

Yes. Michael Zerega 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 organizations bill Medicare for Michael Zerega's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Michael Zerega reassigns Medicare benefits to 2 organizations: Mercy Hospitals East Communities (Saint Louis, MO) and Mercy Clinic Gastroenterology, LLC (Saint Louis, MO). Each 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 Michael Zerega's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Michael Zerega 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 3 other insurers list Michael Zerega 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 Michael Zerega affiliated with any hospitals?

According to CMS data, Michael Zerega is affiliated with Mercy Hospital St Louis, Mercy Hospital Washington, Mercy Hospital South and Missouri Baptist Medical Center.

When was this NPI record last updated?

The NPPES record for Michael Zerega was last updated on April 2, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.