Mary Antionette Fitzsimons, MD - Medicare Emergency Medicine in Antioch, CA

Mary Antionette Fitzsimons, MD is a medicare enrolled "Emergency Medicine" physician in Antioch, California. Her current practice location is 3901 Lone Tree Way, Antioch, California. You can reach out to her office (for appointments etc.) via phone at (925) 779-7273.

Mary Antionette Fitzsimons is licensed to practice in California (license number G56339) and she also participates in the medicare program. She does not accept medicare assignments directly but she may accept medicare through third-party (refer to Reassignment section below) and may also prescribe medicare part D drugs. Her NPI Number is 1053330431.

Contact Information

Mary Antionette Fitzsimons, MD
3901 Lone Tree Way,
Antioch, CA 94509-6200
(925) 779-7273
Not Available

Map and Direction




Physician's Profile

Full NameMary Antionette Fitzsimons
GenderFemale
SpecialityEmergency Medicine
Location3901 Lone Tree Way, Antioch, California
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1053330431
  • Provider Enumeration Date: 07/18/2006
  • Last Update Date: 10/24/2007
  Medicare PECOS Information:
  • PECOS PAC ID: 8426961319
  • Enrollment ID: I20080508000340

Medical Identifiers

Medical identifiers for Mary Antionette Fitzsimons such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1053330431NPI-NPPES
00G563390MedicaidCA

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207P00000XEmergency Medicine G56339 (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. Mary Antionette Fitzsimons allows following entities to bill medicare on her behalf.
Entity NameCep America - California
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1023063542
PECOS PAC ID: 6103739131
Enrollment ID: O20031106000520

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. Mary Antionette Fitzsimons 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
Mary Antionette Fitzsimons, MD
2100 Powell St, Ste 900,
Emeryville, CA 94608-1826

Ph: (510) 350-2600
Mary Antionette Fitzsimons, MD
3901 Lone Tree Way,
Antioch, CA 94509-6200

Ph: (925) 779-7273

Reviews and Comments


Emergency Medicine Doctors in Antioch, CA

Kathleen A Regacho, MD
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 3901 Lone Tree Way, Antioch, CA 94509
Phone: 925-779-3522    
Khanh D Nguyen, M.D.
Emergency Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 3901 Lone Tree Way, Antioch, CA 94509
Phone: 510-350-2657    
Raj V. Dasari, MD
Emergency Medicine
Medicare: Medicare Enrolled
Practice Location: 3400 Delta Fair Blvd, Antioch, CA 94509
Phone: 925-779-5000    
Ivan S. Cavaliere, MD
Emergency Medicine
Medicare: Medicare Enrolled
Practice Location: 3400 Delta Fair Blvd, Antioch, CA 94509
Phone: 925-779-5000    
Russell Gerald Rodriguez, M.D
Emergency Medicine
Medicare: Medicare Enrolled
Practice Location: 3901 Lone Tree Way, Antioch, CA 94509
Phone: 925-779-7273    
Susan Woodmansee, M.D
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 3901 Lone Tree Way, Antioch, CA 94509
Phone: 925-779-7273    

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.