Dr Marcus L Williams, - Medicare Emergency Medicine in Oakland, CA

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Dr Marcus L Williams, is a medicare enrolled "Emergency Medicine" physician in Oakland, California. He went to University Of California, Irvine, California College Of Medicine and graduated in 2012 and has 12 years of diverse experience with area of expertise as Emergency Medicine. He is a member of the group practice Berkeley Emergency Medical Group Inc and his current practice location is 1411 E 31st St, Oakland, California. You can reach out to his office (for appointments etc.) via phone at (510) 437-4800.

Dr Marcus L Williams is licensed to practice in California (license number A103108) 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 1851708168.

Contact Information

Dr Marcus L Williams,
1411 E 31st St,
Oakland, CA 94602-1018
(510) 437-4800
Not Available

Map and Direction




Physician's Profile

Full NameDr Marcus L Williams
GenderMale
SpecialityEmergency Medicine
Experience12 Years
Location1411 E 31st St, Oakland, 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:
  • Dr Marcus L Williams attended and graduated from University Of California, Irvine, California College Of Medicine in 2012
  NPI Data:
  • NPI Number: 1851708168
  • Provider Enumeration Date: 07/18/2014
  • Last Update Date: 05/10/2017
  Medicare PECOS Information:
  • PECOS PAC ID: 6002108370
  • Enrollment ID: I20160706002039

Medical Identifiers

Medical identifiers for Dr Marcus L Williams such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1851708168NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207P00000XEmergency Medicine A103108 (California)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Alta Bates Summit Medical CenterOakland, CAHospital
Alta Bates Summit Medical Center - Alta Bates CampBerkeley, CAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Berkeley Emergency Medical Group Inc589069753647

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. Dr Marcus L Williams 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 NameCep America - California
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1023063542
PECOS PAC ID: 6103739131
Enrollment ID: O20031106000520
Entity NameBerkeley Emergency Medical Group Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1508874454
PECOS PAC ID: 5890697536
Enrollment ID: O20040123000216

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. Dr Marcus L Williams 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
Dr Marcus L Williams,
2500 Merced St,
San Leandro, CA 94577-4201

Ph: () -		Dr Marcus L Williams,
1411 E 31st St,
Oakland, CA 94602-1018

Ph: (510) 437-4800

Reviews and Comments


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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.