Robert A Williams Jr, MD - Medicare Family Medicine in Ventura, CA

  1. Home
  2. Family Medicine
  3. CA
  4. Ventura
Robert A Williams Jr, MD is a medicare enrolled "Family Medicine" physician in Ventura, California. His current practice location is 3291 Loma Vista Rd, Ventura, California. You can reach out to his office (for appointments etc.) via phone at (805) 652-6656.

Robert A Williams Jr is licensed to practice in California (license number A99934) 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 1245400951.

Contact Information

Robert A Williams Jr, MD
3291 Loma Vista Rd,
Ventura, CA 93003-3099
(805) 652-6656
Not Available

Map and Direction




Physician's Profile

Full NameRobert A Williams Jr
GenderMale
SpecialityFamily Medicine
Location3291 Loma Vista Rd, Ventura, California
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1245400951
  • Provider Enumeration Date: 03/10/2008
  • Last Update Date: 09/17/2020
  Medicare PECOS Information:
  • PECOS PAC ID: 9032252994
  • Enrollment ID: I20100201000792

Medical Identifiers

Medical identifiers for Robert A Williams Jr such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1245400951NPI-NPPES
A99934OtherSTATE MEDICAL LICENSE

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207Q00000XFamily Medicine A99934 (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. Robert A Williams Jr allows following entities to bill medicare on his behalf.
Entity NameGeriatric & Family Medicine Associates Pc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1477669323
PECOS PAC ID: 7517959463
Enrollment ID: O20040331001058
Entity NameEmc Pllc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1518589845
PECOS PAC ID: 7315363942
Enrollment ID: O20200813001552

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. Robert A Williams Jr 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
Robert A Williams Jr, MD
10900 W 44th Ave, Unit 100,
Wheat Ridge, CO 80033-2761

Ph: (720) 923-1250		Robert A Williams Jr, MD
3291 Loma Vista Rd,
Ventura, CA 93003-3099

Ph: (805) 652-6656

Reviews and Comments


Family Medicine Doctors in Ventura, CA

Anna Mikhailovsky, M.D.
Family Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 3291 Loma Vista Rd, Ventura, CA 93003
Phone: 805-652-6228    
Dr. Michelle L Daucett, D.O.
Family Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 2721 E Main St, Ventura, CA 93003
Phone: 805-667-2841    Fax: 805-525-6778
Dr. Fouzia Anwar Aftab, MD
Family Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 200 S Wells Rd, Suite 100 Clinicas Del Camino Real Inc, Ventura, CA 93004
Phone: 805-659-1740    Fax: 805-659-9959
Dr. James Sands, MD
Family Medicine
Medicare: May Accept Medicare Assignments
Practice Location: 2715 E Main St, Ventura, CA 93003
Phone: 805-643-2228    
Dr. Ramon Gomez, M.D.
Family Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 3291 Loma Vista Rd, Ventura, CA 93003
Phone: 805-652-6556    
Dr. Marisa Sportelli, M.D.
Family Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 3291 Loma Vista Rd, Ventura, CA 93003
Phone: 805-652-6556    
Dr. Geoffrey L Loman, M.D.
Family Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 168 N Brent St, Ste 502, Ventura, CA 93003
Phone: 805-641-2000    Fax: 805-653-1644

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.