Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Mr. William Henry Guo, PA-C

Individual provider Physician Assistant · NPI 1538873195

Mr. William Henry Guo, PA-C is a Physician Assistant in Mission Hills, California. Graduated from Duke University School of Medicine in 2022, 4 years ago. Practices with Providence Medical Institute, a 336-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in California.

Years since qualifying
4
Trained at
Duke University School of Medicine
Licensed in
CA
In the registry since
2023
Specialties on file
2
What do these letters mean?
PA-C — Physician Assistant, Certified
A physician assistant who holds current national certification.

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Practice location Address checks out

11550 Indian Hills Rd Ste 261
Mission Hills, CA 91345-1244
Phone: (818) 361-0917
Fax: (818) 361-1606
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 15031 Rinaldi St, Mission Hills, CA 91345-1207 — (818) 365-8051

Specialties & licences

Surgical Physician Assistant (primary) Taxonomy 363AS0400X · Licence PA62102 (CA)
Physician Assistant Taxonomy 363A00000X · Licence PA62102 (CA)

Record details

NPI number1538873195
Entity typeIndividual (Type 1)
GenderMale
Credentials PA-C
Sole proprietorNo
NPI enumeratedJanuary 9, 2023
Last updated in NPPESOctober 17, 2025
Certification dateOctober 17, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyPHYSICIAN ASSISTANT
Medical schoolDUKE UNIVERSITY SCHOOL OF MEDICINE
Graduated 2022 (4 years in practice)
Group practice Providence Medical Institute — 336 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients242
Services billed 443 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $184 9 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

  • Providence Holy Cross Medical Center Hospital · Mission Hills, CA

Colleagues at Providence Medical Institute

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 336 clinicians in the practice; 12 are shown here.

Other providers in Mission Hills