Gustavo A Diaz, MD - Medicare Emergency Medicine in Redwood City, CA

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Gustavo A Diaz, MD is a medicare enrolled "Emergency Medicine" physician in Redwood City, California. He went to University Of Texas Medical Branch At Galveston and graduated in 1982 and has 44 years of diverse experience with area of expertise as Emergency Medicine. He is a member of the group practice American Current Care Of California A Medical Corporation, Doctors On Duty Medical Group, Inc and his current practice location is 830 Jefferson Ave, Redwood City, California. You can reach out to his office (for appointments etc.) via phone at (650) 381-0616.

Gustavo A Diaz is licensed to practice in California (license number C54872) 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 1538122635.

Contact Information

Gustavo A Diaz, MD
830 Jefferson Ave,
Redwood City, CA 94063-1804
(650) 381-0616
Not Available

Map and Direction




Physician's Profile

Full NameGustavo A Diaz
GenderMale
SpecialityEmergency Medicine
Experience44 Years
Location830 Jefferson Ave, Redwood City, 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:
  • Gustavo A Diaz attended and graduated from University Of Texas Medical Branch At Galveston in 1982
  NPI Data:
  • NPI Number: 1538122635
  • Provider Enumeration Date: 04/10/2006
  • Last Update Date: 03/16/2026
  Medicare PECOS Information:
  • PECOS PAC ID: 1254374713
  • Enrollment ID: I20111213000435

Medical Identifiers

Medical identifiers for Gustavo A Diaz such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1538122635NPI-NPPES
04-3329195OtherMAGREAT-WEST
04-3329195OtherMANORTH AMERICAN PREFERRED
04-3329195OtherMACONSOLIDATED
053006OtherMATUFTS
J08576OtherMABCBS MA
632919OtherMACONNECTICARE
102531OtherMACIGNA
438822OtherMAHARVARD PILGRIM
000000006706OtherMABMC
04-3329195OtherMANORTHEAST HEALTHCARE ALLI
04-3329195OtherMAUNICARE/GIC
04-3329195OtherMANORTHEAST HEALTH DIRECT
04-3329195OtherMAPLAN VISTA
2359897OtherMAAETNA
3000915MedicaidMA
04-3329195OtherMAPHCS
24922OtherMAHEALTH NEW ENGLAND

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207P00000XEmergency Medicine C54872 (California)Primary
207P00000XEmergency Medicine 53006 (Massachusetts)Secondary

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
American Current Care Of California A Medical Corporation5799854303135
Doctors On Duty Medical Group, Inc246636670364

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. Gustavo A Diaz allows following entities to bill medicare on his behalf.
Entity NameDoctors on Duty Medical Group, Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1568465466
PECOS PAC ID: 2466366703
Enrollment ID: O20031119000451
Entity NamePinnacle Medical Group, Inc.
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1669557930
PECOS PAC ID: 8921081076
Enrollment ID: O20040609001432
Entity NameUCSF Health Medical Foundation
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1922124866
PECOS PAC ID: 9436239878
Enrollment ID: O20080110000320
Entity NameAmerican Current Care of California a Medical Corporation
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1750573622
PECOS PAC ID: 5799854303
Enrollment ID: O20080522000420

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. Gustavo A Diaz 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
Gustavo A Diaz, MD
100 Wilson Rd Ste 100,
Monterey, CA 93940-7885

Ph: (831) 649-1000		Gustavo A Diaz, MD
830 Jefferson Ave,
Redwood City, CA 94063-1804

Ph: (650) 381-0616

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.