William G Grehan, MD - Medicare Anesthesiology in Melrose Park, IL

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William G Grehan, MD is a medicare enrolled "Anesthesiology" physician in Melrose Park, Illinois. He went to Georgetown University School Of Medicine and graduated in 1988 and has 37 years of diverse experience with area of expertise as Anesthesiology. He is a member of the group practice Advocate Health And Hospitals Corporation, Gottlieb Midwest Anesthesiologists, Llc, Midwest Anesthesia Providers Sc, Cep America - Anesthesia Pc and his current practice location is 701 W North Ave, Melrose Park, Illinois. You can reach out to his office (for appointments etc.) via phone at (708) 681-3202.

William G Grehan is licensed to practice in South Carolina (license number 89895) 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 1417961061.

Contact Information

William G Grehan, MD
701 W North Ave,
Melrose Park, IL 60160-1612
(708) 681-3202
Not Available

Map and Direction




Physician's Profile

Full NameWilliam G Grehan
GenderMale
SpecialityAnesthesiology
Experience37 Years
Location701 W North Ave, Melrose Park, 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:
  • William G Grehan attended and graduated from Georgetown University School Of Medicine in 1988
  NPI Data:
  • NPI Number: 1417961061
  • Provider Enumeration Date: 07/28/2006
  • Last Update Date: 04/22/2025
  Medicare PECOS Information:
  • PECOS PAC ID: 2466353289
  • Enrollment ID: I20040127000073

Medical Identifiers

Medical identifiers for William G Grehan such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1417961061NPI-NPPES
36082615MedicaidIL

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207L00000XAnesthesiology 036-082615 (Illinois)Secondary
207LP2900XAnesthesiology - Pain Medicine 036-082615 (Illinois)Secondary
207L00000XAnesthesiology 89895 (South Carolina)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Hilton Head Regional Medical CenterHilton head island, SCHospital
Adventist La Grange Memorial HospitalLa grange, ILHospital
Advocate Christ Hospital & Medical CenterOak lawn, ILHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Advocate Health And Hospitals Corporation78108009352682
Gottlieb Midwest Anesthesiologists, Llc812392994043
Midwest Anesthesia Providers Sc9830480581148
Cep America - Anesthesia Pc3678897915397

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. William G Grehan allows following entities to bill medicare on his behalf.
Entity NameAdvocate Health And Hospitals Corporation
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1700824455
PECOS PAC ID: 7810800935
Enrollment ID: O20031106000064
Entity NameGottlieb Midwest Anesthesiologists, Llc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1003832767
PECOS PAC ID: 8123929940
Enrollment ID: O20040115000619
Entity NameDupage Valley Anesthesiologists Ltd
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1457309817
PECOS PAC ID: 6305747890
Enrollment ID: O20040116001019
Entity NameMidwest Anesthesia Partners Llc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1255380184
PECOS PAC ID: 6204737596
Enrollment ID: O20040120000034
Entity NameMidwest Anesthesia Providers Sc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1295189082
PECOS PAC ID: 9830480581
Enrollment ID: O20160628000182

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. William G Grehan 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
William G Grehan, MD
1121 Lake Cook Rd, Ste M,
Deerfield, IL 60015-5234

Ph: (847) 945-4550		William G Grehan, MD
701 W North Ave,
Melrose Park, IL 60160-1612

Ph: (708) 681-3202

Reviews and Comments


Anesthesiology Doctors in Melrose Park, IL

Tamara Rendulic, M.D.
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Practice Location: 1225 W Lake St, Westlake Hospital / Anesthesia Department, Melrose Park, IL 60160
Phone: 708-681-3000    
Evin Aryan Koleini,
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Practice Location: 701 W North Ave, Melrose Park, IL 60160
Phone: 708-538-4934    Fax: 708-538-5328
Steve In-hyuk Ro,
Anesthesiology
Medicare: Accepting Medicare Assignments
Practice Location: 701 W North Ave, Melrose Park, IL 60160
Phone: 312-560-2655    
John Paul Sims, MD
Anesthesiology
Medicare: Accepting Medicare Assignments
Practice Location: 701 W North Ave, Melrose Park, IL 60160
Phone: 708-681-3202    
Rebecca Aureus, MD
Anesthesiology
Medicare: Accepting Medicare Assignments
Practice Location: 701 West North Avenue, Melrose Park, IL 60160
Phone: 708-681-3202    
Michael Alan King, M.D.
Anesthesiology
Medicare: Medicare Enrolled
Practice Location: 1225 West Lake Street, Melrose Park, IL 60160
Phone: 708-681-3000    Fax: 708-783-0920

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.