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

Treanna Lynne Mather, PA

Individual provider Surgical Physician Assistant · NPI 1942440334

Treanna Lynne Mather, PA is a Physician Assistant in Orange, California. Graduated from Loma Linda University School of Medicine in 2008, 18 years ago. Practices with Orthopaedic Specialty Institute Medical Group of Orange County, a 63-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
18
Trained at
Loma Linda University School of Medicine
Licensed in
CA
In the registry since
2009
What do these letters mean?
PA — Physician Assistant
A licensed clinician who examines, diagnoses and treats under a physician's supervision.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

280 S Main St 200
Orange, CA 92868-3852 Not confirmed with CMS for 17 years — call before visiting
Phone: (714) 634-4567
Fax: (714) 634-4569
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Surgical Physician Assistant (primary) Taxonomy 363AS0400X · Licence PA20026 (CA)

Record details

NPI number1942440334
Entity typeIndividual (Type 1)
GenderFemale
Credentials PA
Sole proprietorYes
NPI enumeratedFebruary 25, 2009
Last updated in NPPESFebruary 25, 2009

Medicare enrollment

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

Medicare specialtyPHYSICIAN ASSISTANT
Medical schoolLOMA LINDA UNIVERSITY SCHOOL OF MEDICINE
Graduated 2008 (18 years in practice)
Group practice Orthopaedic Specialty Institute Medical Group Of Orange County — 63 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients486
Services billed 1,690 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

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 $213 5 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.

Colleagues at Orthopaedic Specialty Institute Medical Group of Orange County

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 63 clinicians in the practice; 12 are shown here.

Other providers in Orange