William M Greif, MD - Medicare in Walnut Creek, CA

William M Greif, MD is a medicare enrolled "Surgery" physician in Walnut Creek, California. His current practice location is 1425 S Main St, Walnut Creek, California. You can reach out to his office (for appointments etc.) via phone at (925) 295-4000.

William M Greif is licensed to practice in California (license number G85813) 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 1013095108.

Contact Information

William M Greif, MD
1425 S Main St,
Walnut Creek, CA 94596-5318
(925) 295-4000
Not Available

Map and Direction




Physician's Profile

Full NameWilliam M Greif
GenderMale
Speciality
Experience Years
Location1425 S Main St, Walnut Creek, California
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 M Greif attended and graduated from in
  NPI Data:
  • NPI Number: 1013095108
  • Provider Enumeration Date: 11/02/2006
  • Last Update Date: 12/13/2021
  Medicare PECOS Information:
  • PECOS PAC ID:
  • Enrollment ID:

Medical Identifiers

Medical identifiers for William M Greif such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1013095108NPI-NPPES
00G858130MedicaidCA

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
208600000XSurgery G85813 (California)Primary

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 M Greif 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 M Greif, MD
1800 Harrison St Fl 7,
Oakland, CA 94612-3466

Ph: (510) 625-6262
William M Greif, MD
1425 S Main St,
Walnut Creek, CA 94596-5318

Ph: (925) 295-4000

Reviews and Comments


Surgery Doctors in Walnut Creek, CA

Dr. Jesus Gil Jimenez, MD
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Medicare: Accepting Medicare Assignments
Practice Location: 1425 S Main St, Walnut Creek, CA 94596
Phone: 925-295-4110    
Dr. Negar Monavar Salehomoum, M.D.
Surgery
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Practice Location: 365 Lennon Ln Ste 290, Walnut Creek, CA 94598
Phone: 925-274-9000    Fax: 925-274-9004
Kara L. Riley-paull, MD
Surgery
Medicare: Medicare Enrolled
Practice Location: 1425 S Main St, Walnut Creek, CA 94596
Phone: 925-295-4000    
Dr. Irene Jia-shin Lo, M.D.
Surgery
Medicare: Accepting Medicare Assignments
Practice Location: 130 La Casa Via, Building 3, Suite 211, Walnut Creek, CA 94598
Phone: 925-933-0984    
Dr. Aaron Brandon Chin, M.D.
Surgery
Medicare: Accepting Medicare Assignments
Practice Location: 1425 S Main St, Walnut Creek, CA 94596
Phone: 925-295-4000    
Charles F. Rieder, MD
Surgery
Medicare: Not Enrolled in Medicare
Practice Location: 1425 S Main St, Walnut Creek, CA 94596
Phone: 925-295-4000    

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.