Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Michael T. Mai, MD

Individual provider Adult Reconstructive Orthopaedic Surgery Physician · NPI 1124025598

Michael T. Mai, MD practises Orthopedic Surgery in Corona, California. Graduated from Stanford University School of Medicine in 1985, 41 years ago. Practices with Riverside Medical Clinic Inc, a 174-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in California.

Years since qualifying
41
Trained at
Stanford University School of Medicine
Licensed in
CA
In the registry since
2005
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

21634 Retreat Pkwy
Corona, CA 92883-6100
Phone: (951) 493-6930
Fax: (951) 826-8136
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 818 Magnolia Ave., Corona, CA 92879 — (951) 493-6930

Specialties & licences

Orthopaedic Surgery Physician (primary) Taxonomy 207X00000X · Licence G57605 (CA)
Adult Reconstructive Orthopaedic Surgery Physician Taxonomy 207XS0114X · Licence G57605 (CA)

Record details

NPI number1124025598
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 30, 2005
Last updated in NPPESApril 14, 2025
Certification dateApril 14, 2025

Medicare enrollment

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

Medicare specialtyORTHOPEDIC SURGERY
Medical schoolSTANFORD UNIVERSITY SCHOOL OF MEDICINE
Graduated 1985 (41 years in practice)
Group practice Riverside Medical Clinic Inc — 174 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Hip replacement 1–10 times
Knee replacement 1–10 times
Lower limb (leg) arthroscopy (minimally invasive joint repair) 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

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 patients35
Services billed 578 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

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.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Riverside Medical Clinic Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 174 clinicians in the practice; 12 are shown here.

Other providers in Corona