Caitlin De Castro
Physician Assistant · San Mateo, CA
Caitlin De Castro is a physician assistant with a practice address in San Mateo, California, and NPI 1265219075, issued on Sep 13, 2023. Check the license (California PA64051, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Caitlin De Castro
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- PA64051 CA
Self-reported in NPPES; status is on the state search - Practice location
- 50 S San Mateo Dr, San Mateo, CA 94401
- Phone
- (650) 652-8500
- Enumerated
- Sep 13, 2023
- Record last updated
- May 5, 2026
- Fax
- (650) 652-8501
- Medicare enrollment
- Enrolled (PECOS I20240424003478); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 14,451 in California → Look up another NPI →
Also registered at 50 S San Mateo Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Bruce Bern, M.D.Ophthalmology Physician1700954278
- Jeanne Beymer, MDPediatrics Physician1114913530
- Hayley Brown, MS, RN, FNP-CFamily Nurse Practitioner1518395169
- Stephen Buchner, MDPediatrics Physician1013938786
Verify Caitlin De Castro in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PA64051Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
57% fewer Medicare Part D claims than the average physician assistant in 2024
361 Medicare Part D claims for 240 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 27 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen17 claims
- Cephalexin15 claims
- Paxlovid12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $130.06
2 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. The 64,719 providers of this specialty with any payment received $841.65 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Providence Medical FoundationSanta Rosa, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Caitlin De Castro among 14,451 physician assistant records in California
Caitlin De Castro is one of 14,451 physician assistant records with a practice address in California. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2023, is newer than 80% of them.
- NPI issued2023 · 80% of these records are older, 13% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated2023 · median 2018 among the 7,214 with a school on file
- Record last updated2026 · 40% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Physician Assistant providers in California
There are 14,451 physician assistant records in California.
All 14,451 in California → Every provider in San Mateo → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Rebecca ForrestSan Mateo, CA 944011306293048
- Laurel King, PASan Mateo, CA 944011508954132
- Shelby O'HaraSan Mateo, CA 944011427762160
- Samantha Oliveira, PA-C, MS, MPHSan Mateo, CA 944011326449893
- Jose Perez, PHYSICIAN ASSISTANTSan Mateo, CA 944011336294651
- Elizabeth Quadraccia, PASan Mateo, CA 944011811936800
- Denise RosSan Mateo, CA 944011093351751
- Matthew Shaw, PA-CSan Mateo, CA 944011730453390
Common questions
What is Caitlin De Castro's NPI number?
Caitlin De Castro's National Provider Identifier (NPI) is 1265219075, issued on Sep 13, 2023. An NPI identifies a provider in billing; it is not a license.
Where is Caitlin De Castro located?
The NPPES record lists a practice address at 50 S San Mateo Dr, San Mateo, CA, 94401. Phone: (650) 652-8500. Providers update this record themselves, so call before visiting.
How can I verify Caitlin De Castro's license?
NPPES lists California license number PA64051, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Caitlin De Castro prescribe under Medicare Part D?
In 2024, Caitlin De Castro had 361 Medicare Part D claims for 240 beneficiaries; the average among physician assistant prescribers was 830. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.