Caitlin De Castro, - Medicare Physician Assistant in San Mateo, CA

Caitlin De Castro, is a medicare enrolled "Physician Assistant" in San Mateo, California. She graduated from nursing school in 2023 and has 3 years of diverse experience with area of expertise as Physician Assistant. She is a member of the group practice Providence Medical Foundation, Sutter Bay Medical Foundation and her current practice location is 50 S San Mateo Dr, San Mateo, California. You can reach out to her office (for appointments etc.) via phone at (650) 652-8500.

Caitlin De Castro is licensed to practice in California (license number PA64051) and she also participates in the medicare program. She accepts medicare assignments (which means she accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and her NPI Number is 1265219075.

Contact Information

Caitlin De Castro,
50 S San Mateo Dr,
San Mateo, CA 94401-3857
(650) 652-8500
(650) 652-8501

Map and Direction




Provider's Profile

Full NameCaitlin De Castro
GenderFemale
SpecialityPhysician Assistant
Experience3 Years
Location50 S San Mateo Dr, San Mateo, California
Accepts Medicare AssignmentsYes. She accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Caitlin De Castro graduated from nursing school in 2023
  NPI Data:
  • NPI Number: 1265219075
  • Provider Enumeration Date: 09/13/2023
  • Last Update Date: 05/05/2026
  Medicare PECOS Information:
  • PECOS PAC ID: 7214377266
  • Enrollment ID: I20240424003478

Medical Identifiers

Medical identifiers for Caitlin De Castro such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1265219075NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
363A00000XPhysician Assistant PA64051 (California)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Providence Santa Rosa Memorial HospitalSanta rosa, CAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Providence Medical Foundation89219932051461
Sutter Bay Medical Foundation42845387783783

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. Caitlin De Castro allows following entities to bill medicare on her behalf.
Entity NameSutter Bay Medical Foundation
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1013950807
PECOS PAC ID: 4284538778
Enrollment ID: O20031125000909
Entity NameProvidence Medical Foundation
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1871607762
PECOS PAC ID: 8921993205
Enrollment ID: O20040216001346

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. Caitlin De Castro 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
Caitlin De Castro,
Po Box 276950,
Sacramento, CA 95827-6950

Ph: (650) 652-8500
Caitlin De Castro,
50 S San Mateo Dr,
San Mateo, CA 94401-3857

Ph: (650) 652-8500

Reviews and Comments


Physician Assistant Nurses in San Mateo, CA

Denise Mary Ros,
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Practice Location: 50 S San Mateo Dr, San Mateo, CA 94401
Phone: 650-652-8788    
Elena Nimon, PA-C
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Alyssa Sahu, PA
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Maria De La Paz Guzman, P.A-C
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Practice Location: 222 W 39th Ave, San Mateo, CA 94403
Phone: 650-573-2671    
Jessica K Chu, PA
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Medicare: Medicare Enrolled
Practice Location: 222 W 39th Ave, San Mateo, CA 94403
Phone: 650-573-2222    Fax: 650-573-2214
Rebecca Forrest,
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Medicare: Not Enrolled in Medicare
Practice Location: 100 S Ellsworth Ave, Suite 806, San Mateo, CA 94401
Phone: 650-401-6060    
Samantha Oliveira, PA-C, MS, MPH
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Medicare: Accepting Medicare Assignments
Practice Location: 77 N San Mateo Dr, San Mateo, CA 94401
Phone: 650-342-0849    

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.