Gerald Roy Nazareno, MD - Medicare Emergency Medicine in Pleasanton, CA

Gerald Roy Nazareno, MD is a medicare enrolled "Emergency Medicine" physician in Pleasanton, California. He graduated from medical school in 1987 and has 37 years of diverse experience with area of expertise as Emergency Medicine. He is a member of the group practice Pleasanton Emergency Medical Group and his current practice location is 5555 W Las Positas Blvd, Pleasanton, California. You can reach out to his office (for appointments etc.) via phone at (209) 342-2300.

Gerald Roy Nazareno is licensed to practice in California (license number A53590) 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 1679564983.

Contact Information

Gerald Roy Nazareno, MD
5555 W Las Positas Blvd,
Pleasanton, CA 94588-4000
(209) 342-2300
(209) 524-4240

Map and Direction




Physician's Profile

Full NameGerald Roy Nazareno
GenderMale
SpecialityEmergency Medicine
Experience37 Years
Location5555 W Las Positas Blvd, Pleasanton, 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:
  • Gerald Roy Nazareno graduated from medical school in 1987
  NPI Data:
  • NPI Number: 1679564983
  • Provider Enumeration Date: 11/04/2005
  • Last Update Date: 07/08/2007
  Medicare PECOS Information:
  • PECOS PAC ID: 6709774482
  • Enrollment ID: I20040310000497

Medical Identifiers

Medical identifiers for Gerald Roy Nazareno such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1679564983NPI-NPPES
00A535900MedicaidCA
00A535900OtherCABLUE SHIELD

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207P00000XEmergency Medicine A53590 (California)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Stanford Health Care - ValleycarePleasanton, CAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Pleasanton Emergency Medical Group014311892737

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. Gerald Roy Nazareno allows following entities to bill medicare on his behalf.
Entity NamePleasanton Emergency Medical Group
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1285625509
PECOS PAC ID: 0143118927
Enrollment ID: O20040304001270

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. Gerald Roy Nazareno 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
Gerald Roy Nazareno, MD
4301 Northstar Way,
Modesto, CA 95356-9262

Ph: (209) 342-2300
Gerald Roy Nazareno, MD
5555 W Las Positas Blvd,
Pleasanton, CA 94588-4000

Ph: (209) 342-2300

Reviews and Comments


Emergency Medicine Doctors in Pleasanton, CA

Cynthia Sue Penn-duecker, MD
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 5555 W Las Positas Blvd, Pleasanton, CA 94588
Phone: 209-342-2300    Fax: 209-524-4240
Dr. Tony G Shiu, MD
Emergency Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 5555 W Las Positas Blvd, Pleasanton, CA 94588
Phone: 209-342-2300    Fax: 209-524-4240
Edward Y Kan, MD
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 5555 W Las Positas Blvd, Pleasanton, CA 94588
Phone: 209-342-2300    Fax: 209-524-4240
Yen-hua Yu, D.O.
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 5555 W Las Positas Blvd, Pleasanton, CA 94588
Phone: 925-416-6585    
Scott Gregory Seidman, MD
Emergency Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 5555 W Las Positas Blvd, Pleasanton, CA 94588
Phone: 209-342-2300    Fax: 209-524-4240
Douglas Kei Yoshida, MD
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 5555 W Las Positas Blvd, Pleasanton, CA 94588
Phone: 209-342-2300    Fax: 209-524-4240
Robert Louis Mandiberg,
Emergency Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 5555 W Las Positas Blvd, Pleasanton, CA 94588
Phone: 209-342-2300    Fax: 209-524-4240

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.