Michael T. Mai, MD
Orthopaedic Surgery Physician · Corona, CA
Michael T. Mai, MD is an orthopaedic surgery physician with a practice address in Corona, California, and NPI 1124025598, issued on Jun 30, 2005. Check the license (California G57605, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Michael T. Mai
- Credential
- MD
- Primary taxonomy
- Orthopaedic Surgery Physician 207X00000X
- License number
- G57605 CA
Self-reported in NPPES; status is on the state search - Practice location
- 21634 Retreat Pkwy, Corona, CA 92883
- Phone
- (951) 493-6930
- Enumerated
- Jun 30, 2005
- Record last updated
- Apr 14, 2025
- Fax
- (951) 826-8136
- Medicare enrollment
- Enrolled (PECOS I20080311000263); accepts Medicare assignment
- Medical or professional school
- Stanford University School Of Medicine, 1985
- Entity
- Type 1 · individual
8 nearest orthopaedic surgery physician records → All 2,276 in California → Look up another NPI →
Also registered at 21634 Retreat Pkwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Michael T. Mai in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G57605Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
66% fewer Medicare Part D claims than the average orthopaedic surgery physician in 2024
118 Medicare Part D claims for 50 beneficiaries, against an average of 346 among the 16,516 providers of this specialty who prescribed in Part D. 49 claims were for opioids.
Most prescribed
- Ibuprofen35 claims
- Hydrocodone-Acetaminophen32 claims
- Naproxen18 claims
- Oxycodone-Acetaminophen12 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: $47.96
2 payments; by number, the most common kind was food and beverage; the largest payer was Atricure, Inc. The 15,003 providers of this specialty with any payment received $23,022.89 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
- Riverside Medical Clinic IncRiverside, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Michael T. Mai among 2,276 orthopaedic surgery physician records in California
Michael T. Mai, MD is one of 2,276 orthopaedic surgery physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 90% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated1985 · median 2003 among the 1,347 with a school on file
- Record last updated2025 · 66% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207X00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Orthopaedic Surgery Physician providers in California
There are 2,276 orthopaedic surgery physician records in California.
All 2,276 in California → Every provider in Corona → Orthopaedic Surgery Physician nationwide →
The 8 orthopaedic surgery physician records with the nearest ZIP codes
- Ronald Crater, M.D.Temescal Valley, CA 928831801172291
- Joseph Mayo, MDYorba Linda, CA 928861366522476
- Martin Stauber, M.D.Yorba Linda, CA 928861689742181
- Bradley Baum, MDCorona, CA 928791205847654
- Vicente Bernabe, D.O.Corona, CA 928791164483699
- Mitchell Geiger, MDCorona, CA 928791235149675
- Nasser Heyrani, M.D.Corona, CA 928791730523945
- Jeff KimballCorona, CA 928791750814182
Common questions
What is Michael T. Mai, MD's NPI number?
Michael T. Mai, MD's National Provider Identifier (NPI) is 1124025598, issued on Jun 30, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Michael T. Mai, MD located?
The NPPES record lists a practice address at 21634 Retreat Pkwy, Corona, CA, 92883. Phone: (951) 493-6930. Providers update this record themselves, so call before visiting.
How can I verify Michael T. Mai, MD's license?
NPPES lists California license number G57605, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Michael T. Mai, MD prescribe under Medicare Part D?
In 2024, Michael T. Mai, MD had 118 Medicare Part D claims for 50 beneficiaries; the average among orthopaedic surgery physician prescribers was 346. 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.