Mark E Williams, MD - Medicare Emergency Medicine in Santa Rosa, CA

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Mark E Williams, MD is a medicare enrolled "Emergency Medicine" physician in Santa Rosa, California. His current practice location is 401 Bicentennial Way, Santa Rosa, California. You can reach out to his office (for appointments etc.) via phone at (707) 393-4800.

Mark E Williams is licensed to practice in California (license number A72120) 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 1770661530.

Contact Information

Mark E Williams, MD
401 Bicentennial Way,
Santa Rosa, CA 95403-2149
(707) 393-4800
Not Available

Map and Direction




Physician's Profile

Full NameMark E Williams
GenderMale
SpecialityEmergency Medicine
Location401 Bicentennial Way, Santa Rosa, California
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1770661530
  • Provider Enumeration Date: 11/01/2006
  • Last Update Date: 04/05/2024
  Medicare PECOS Information:
  • PECOS PAC ID: 8527248731
  • Enrollment ID: I20110204000690

Medical Identifiers

Medical identifiers for Mark E Williams such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1770661530NPI-NPPES
00A721200MedicaidCA

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207P00000XEmergency Medicine A72120 (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. Mark E 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

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. Mark E 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
Mark E Williams, MD
1800 Harrison St Fl 7,
Oakland, CA 94612-3466

Ph: (510) 625-6262		Mark E Williams, MD
401 Bicentennial Way,
Santa Rosa, CA 95403-2149

Ph: (707) 393-4800

Reviews and Comments


Emergency Medicine Doctors in Santa Rosa, CA

Barry Smith, M.D.
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Practice Location: Santa Rosa Memorial Hospital, 1165 Montgomery Drive, Santa Rosa, CA 95405
Phone: 707-522-1573    
Dr. Ridgely Oliver Muller, M.D.
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1165 Montgomery Dr, Santa Rosa, CA 95405
Phone: 707-525-5207    Fax: 626-397-5643
James John Mc Keith, M.D.
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1165 Montgomery Dr, Santa Rosa Memorial Hospital, Santa Rosa, CA 95405
Phone: 707-525-5207    
Christina Marie Goodwin, M.D.
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1165 Montgomery Dr, M/s 1w04, Santa Rosa, CA 95405
Phone: 707-547-5471    Fax: 707-525-5280
Daniel T Matulich, M.D.
Emergency Medicine
Medicare: Medicare Enrolled
Practice Location: 1165 Montgomery Dr, Santa Rosa Memorial Hospital, Santa Rosa, CA 95405
Phone: 707-552-1573    
Yizza Narvaez, M.D.
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 401 Bicentennial Way, Santa Rosa, CA 95403
Phone: 707-684-1538    
S. Mitchell Savitsky, MD
Emergency Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 401 Bicentennial Way, Santa Rosa, CA 95403
Phone: 707-571-4000    

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.