Michael J Zerega, MD - Medicare Gastroenterology in Lake St Louis, MO

Michael J Zerega, MD is a medicare enrolled "Internal Medicine - Gastroenterology" physician in Lake St Louis, Missouri. He went to Washington University School Of Medicine and graduated in 1997 and has 27 years of diverse experience with area of expertise as Gastroenterology. He is a member of the group practice Mercy Clinic Gastroenterology Llc and his current practice location is 200 Brevco Plz, Suite 208, Lake St Louis, Missouri. You can reach out to his office (for appointments etc.) via phone at (636) 561-9020.

Michael J Zerega is licensed to practice in Missouri (license number 2000154596) and he also participates in the medicare program. He accepts medicare assignments (which means he accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and his NPI Number is 1073505178.

Contact Information

Michael J Zerega, MD
200 Brevco Plz, Suite 208,
Lake St Louis, MO 63367-2949
(636) 561-9020
(636) 561-6208

Map and Direction




Physician's Profile

Full NameMichael J Zerega
GenderMale
SpecialityGastroenterology
Experience27 Years
Location200 Brevco Plz, Lake St Louis, Missouri
Accepts Medicare AssignmentsYes. He accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Michael J Zerega attended and graduated from Washington University School Of Medicine in 1997
  NPI Data:
  • NPI Number: 1073505178
  • Provider Enumeration Date: 08/16/2005
  • Last Update Date: 04/02/2015
  Medicare PECOS Information:
  • PECOS PAC ID: 0042231250
  • Enrollment ID: I20051215000647

Medical Identifiers

Medical identifiers for Michael J Zerega such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1073505178NPI-NPPES
1073505178MedicaidMO
P01015409OtherMORAILROAD MEDICARE
18943OtherBC BS MO

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207RG0100XInternal Medicine - Gastroenterology 2000154596 (Missouri)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Mercy Hospital St LouisSaint louis, MOHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Mercy Clinic Gastroenterology Llc862812179555

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Michael J Zerega allows following entities to bill medicare on his behalf.
Entity NameMercy Hospitals East Communities
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1851431738
PECOS PAC ID: 1658276811
Enrollment ID: O20031218000107
Entity NameMercy Clinic Gastroenterology Llc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1528295334
PECOS PAC ID: 8628121795
Enrollment ID: O20090806000762

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Michael J Zerega is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Michael J Zerega, MD
200 Brevco Plz, Suite 208,
Lake St Louis, MO 63367-2949

Ph: (636) 561-9020
Michael J Zerega, MD
200 Brevco Plz, Suite 208,
Lake St Louis, MO 63367-2949

Ph: (636) 561-9020

Reviews and Comments


Internal Medicine Doctors in Lake St Louis, MO

John David Wilkes, MD
Gastroenterology
Medicare: Not Enrolled in Medicare
Practice Location: 400 Medical Plz, Suite 100, Lake St Louis, MO 63367
Phone: 636-639-8600    Fax: 636-639-8676
Dr. Paul Barto Vatterott, M.D.
Gastroenterology
Medicare: Medicare Enrolled
Practice Location: 107 Brevco Plz, Lake St Louis, MO 63367
Phone: 636-561-8100    Fax: 636-561-3396
Umesh C. Inampudi, M.D.
Gastroenterology
Medicare: Accepting Medicare Assignments
Practice Location: 100 Medical Plz, Lake St Louis, MO 63367
Phone: 314-317-0600    Fax: 314-317-0606
Dr. Ammar Nasir, MD
Gastroenterology
Medicare: Accepting Medicare Assignments
Practice Location: 300 Medical Plz Ste 150, Lake St Louis, MO 63367
Phone: 636-625-2662    
Dr. Kristen Marie Strasser, M.D.
Gastroenterology
Medicare: Accepting Medicare Assignments
Practice Location: 400 Medical Plz Ste 100, Lake St Louis, MO 63367
Phone: 636-639-8600    
James Von Beattie, DO
Gastroenterology
Medicare: Accepting Medicare Assignments
Practice Location: 400 Medical Plz, Suite 100, Lake St Louis, MO 63367
Phone: 636-639-8600    Fax: 636-639-8676

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.