William R Shirer, MD - Medicare Anesthesiology in San Jose, CA

William R Shirer, MD is a medicare enrolled "Anesthesiology" physician in San Jose, California. His current practice location is 250 Hospital Pkwy, San Jose, California. You can reach out to his office (for appointments etc.) via phone at (408) 972-3000.

William R Shirer is licensed to practice in California (license number A157296) and he also participates in the medicare program. He does not accept medicare assignments directly but he may accept medicare through third-party (refer to Reassignment section below) and may also prescribe medicare part D drugs. His NPI Number is 1912438854.

Contact Information

William R Shirer, MD
250 Hospital Pkwy,
San Jose, CA 95119-1103
(408) 972-3000
Not Available

Map and Direction




Physician's Profile

Full NameWilliam R Shirer
GenderMale
SpecialityAnesthesiology
Location250 Hospital Pkwy, San Jose, California
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1912438854
  • Provider Enumeration Date: 03/22/2017
  • Last Update Date: 08/01/2022
  Medicare PECOS Information:
  • PECOS PAC ID: 7416357397
  • Enrollment ID: I20210615000665

Medical Identifiers

Medical identifiers for William R Shirer such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1912438854NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207L00000XAnesthesiology A157296 (California)Primary

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 R Shirer allows following entities to bill medicare on his behalf.
Entity NamePermanente Medical Group Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1073606299
PECOS PAC ID: 8921910225
Enrollment ID: O20031104000710
Entity NameStanford Health Care
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1437292927
PECOS PAC ID: 6709797491
Enrollment ID: O20031124000348
Entity NameFirst Choice Physician Partners
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1104183052
PECOS PAC ID: 0941465322
Enrollment ID: O20120710000480

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 R Shirer 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 R Shirer, MD
250 Hospital Pkwy,
San Jose, CA 95119-1103

Ph: (408) 972-3000
William R Shirer, MD
250 Hospital Pkwy,
San Jose, CA 95119-1103

Ph: (408) 972-3000

Reviews and Comments


Anesthesiology Doctors in San Jose, CA

Michael Thomas Paige, MD
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Phone: 408-558-2100    
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Dr. Francis Dominic Wong, D.O
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Practice Location: 250 Hospital Pkwy, San Jose, CA 95119
Phone: 408-972-3000    
Dr. Audrey Lee,
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Practice Location: 2425 Samaritan Dr, San Jose, CA 95124
Phone: 408-559-2011    
Peter Tzee Tseng Sun, MD
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Practice Location: 225 N Jackson Ave, San Jose, CA 95116
Phone: 408-259-5000    Fax: 408-928-7041

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.