Derek Duy Mai, M.D.
Ophthalmology Physician · Mission Hills, CA
Derek Duy Mai, M.D. is an ophthalmology physician with a practice address in Mission Hills, California, and NPI 1386051423, issued on Jul 21, 2014. Check the license (California A141400, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Derek Duy Mai
- Credential
- M.D.
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- A141400 CA
Self-reported in NPPES; status is on the state search - Practice location
- 11333 Sepulveda Blvd, Mission Hills, CA 91345
- Phone
- (818) 869-7269
- Enumerated
- Jul 21, 2014
- Record last updated
- Oct 22, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (818) 403-2167
- Medicare enrollment
- Enrolled (PECOS I20191101000323); accepts Medicare assignment
- Medical or professional school
- University Of California, San Diego School Of Medicine, 2014
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 2,899 in California → Look up another NPI →
Also registered at 11333 Sepulveda Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Derek Duy Mai in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A141400Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.2 times the Medicare Part D claims of the average ophthalmology physician in 2024
3,267 Medicare Part D claims for 799 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 38% of claims.
Most prescribed
- Latanoprost920 claims
- Prednisolone Acetate428 claims
- Moxifloxacin311 claims
- Ketorolac Tromethamine301 claims
- Neomycin-Polymyxin-Dexameth241 claims
- Timolol Maleate204 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.
Bills Medicare through one group practice
- Providence Facey Medical FoundationMission Hills, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Derek Duy Mai among 2,899 ophthalmology physician records in California
Derek Duy Mai, M.D. is one of 2,899 ophthalmology physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2014, is newer than 82% of them.
- NPI issued2014 · 82% of these records are older, 16% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2014 · median 2001 among the 1,907 with a school on file
- Record last updated2019 · 67% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207W00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
9 ophthalmology physician records list a practice address in Mission Hills
They are 9 of the 731 NPPES records with a practice address in Mission Hills, and 2,899 ophthalmology physician records in California.
All 2,899 in California → Every provider in Mission Hills → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Brian Chang, M.D.Mission Hills, CA 913451629335567
- Danny Kim, M.D.Mission Hills, CA 913451700076551
- Michael Lynch, MDMission Hills, CA 913451467468462
- Steven Rauchman, M.D.Mission Hills, CA 913451497707384
- Kayur Shah, MD.Mission Hills, CA 913451215943253
- Robert Smyth-Medina, M.D.Mission Hills, CA 913451073565560
- Adam Tanaka, MD, MPH, MSMission Hills, CA 913451902434244
- Maggie Wei, M.D.Mission Hills, CA 913451730614215
Common questions
What is Derek Duy Mai, M.D.'s NPI number?
Derek Duy Mai, M.D.'s National Provider Identifier (NPI) is 1386051423, issued on Jul 21, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Derek Duy Mai, M.D. located?
The NPPES record lists a practice address at 11333 Sepulveda Blvd, Mission Hills, CA, 91345. Phone: (818) 869-7269. Providers update this record themselves, so call before visiting.
How can I verify Derek Duy Mai, M.D.'s license?
NPPES lists California license number A141400, 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 Derek Duy Mai, M.D. prescribe under Medicare Part D?
In 2024, Derek Duy Mai, M.D. had 3,267 Medicare Part D claims for 799 beneficiaries; the average among ophthalmology physician prescribers was 1,518. 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.