Ahmad Osama Rez, MD - Medicare Internal Medicine in Alton, IL

  1. Home
  2. Hospitalist
  3. IL
  4. Alton
Ahmad Osama Rez, MD is a medicare enrolled "Hospitalist" physician in Alton, Illinois. He graduated from medical school in 2003 and has 21 years of diverse experience with area of expertise as Internal Medicine. He is a member of the group practice Galen Inpatient Physicians Pc, Galen Inpatient Physicians Pc and his current practice location is 1 Saint Anthonys Way, Alton, Illinois. You can reach out to his office (for appointments etc.) via phone at (314) 317-0600.

Ahmad Osama Rez is licensed to practice in Illinois (license number 036.131216) 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 1356537179.

Contact Information

Ahmad Osama Rez, MD
1 Saint Anthonys Way,
Alton, IL 62002-4568
(314) 317-0600
(314) 317-0606

Map and Direction




Physician's Profile

Full NameAhmad Osama Rez
GenderMale
SpecialityInternal Medicine
Experience21 Years
Location1 Saint Anthonys Way, Alton, Illinois
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:
  • Ahmad Osama Rez graduated from medical school in 2003
  NPI Data:
  • NPI Number: 1356537179
  • Provider Enumeration Date: 09/16/2007
  • Last Update Date: 10/21/2024
  Medicare PECOS Information:
  • PECOS PAC ID: 1951435510
  • Enrollment ID: I20100818000219

Medical Identifiers

Medical identifiers for Ahmad Osama Rez such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1356537179NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine 036.131216 (Illinois)Secondary
208M00000XHospitalist 2010014085 (Missouri)Secondary
208M00000XHospitalist 036.131216 (Illinois)Primary
208M00000XHospitalist 036131216 (Illinois)Secondary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Ssm St Clare Health CenterFenton, MOHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Galen Inpatient Physicians Pc3678464633442
Galen Inpatient Physicians Pc3678464633442

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. Ahmad Osama Rez allows following entities to bill medicare on his behalf.
Entity NameGalen Inpatient Physicians Pc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1538714688
PECOS PAC ID: 3678464633
Enrollment ID: O20191115000362

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. Ahmad Osama Rez 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
Ahmad Osama Rez, MD
12101 Woodcrest Executive Dr, Suite 210,
Saint Louis, MO 63141-5047

Ph: (314) 317-0600		Ahmad Osama Rez, MD
1 Saint Anthonys Way,
Alton, IL 62002-4568

Ph: (314) 317-0600

Reviews and Comments


Hospitalist Doctors in Alton, IL

Eric Michael Guenther, D.O.
Hospitalist
Medicare: Accepting Medicare Assignments
Practice Location: 1 Memorial Dr, Alton, IL 62002
Phone: 618-463-7240    Fax: 618-463-7216
Dr. Mena Metias, MD
Hospitalist
Medicare: Accepting Medicare Assignments
Practice Location: 4 Memorial Dr Ste 210, Alton, IL 62002
Phone: 618-463-5905    
Dr. John Albert Richards Jr., M.D.
Hospitalist
Medicare: Accepting Medicare Assignments
Practice Location: 1 Memorial Dr, Alton, IL 62002
Phone: 618-463-7240    Fax: 618-463-7216

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.