Matthew McKay, MD
Emergency Medicine Physician · Fullerton, CA
Matthew McKay, MD is an emergency medicine physician with a practice address in Fullerton, California, and NPI 1184653966, issued on Jul 2, 2006. Check the license (California G68542, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Matthew McKay
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- G68542 CA
Self-reported in NPPES; status is on the state search - Practice location
- 101 E Valencia Mesa Dr, Fullerton, CA 92835
- Phone
- (714) 992-3965
- Enumerated
- Jul 2, 2006
- Record last updated
- Sep 18, 2009 (not updated in 17 years: call before relying on the address or phone)
- Medicaid IDs
- 00G685420 CA
WG68542H CA - Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 101 E Valencia Mesa Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Daniel Abbott, MDEmergency Medicine Physician1518907864
- Nelson Aguinaga, RN, FNPFamily Nurse Practitioner1043909609
- Jonathon Ahn, MDAnesthesiology Physician1053803882
- Sora Ahn, RNCritical Care Medicine Registered Nurse1730026493
- Sherry Ansari, DPTPhysical Medicine & Rehabilitation Physician1467972992
- Tandeep Bains, PHARM.D.Pharmacist1568958114
Verify Matthew McKay in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G68542Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.4 times the Medicare Part D claims of the average emergency medicine physician in 2024
537 Medicare Part D claims for 366 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 54 claims were for opioids.
Most prescribed
- Ondansetron Odt48 claims
- Azithromycin43 claims
- Tramadol Hcl40 claims
- Dicyclomine Hcl35 claims
- Amoxicillin-Clavulanate Potass31 claims
- Cephalexin31 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 85 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $25.00
1 payment: food and beverage; the largest payer was Eisai Inc. The 12,335 providers of this specialty with any payment received $953.79 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.
Matthew McKay among 7,751 emergency medicine physician records in California
Matthew McKay, MD is one of 7,751 emergency medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 4% of them.
- NPI issued2006 · 4% of these records are older, 60% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 59% of these records are
- Record last updated2009 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in California
There are 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Fullerton → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Daniel Abbott, MDFullerton, CA 928351518907864
- Karl Feng, MDFullerton, CA 928351306875190
- Timothy Greco, MDFullerton, CA 928351255369757
- Donald Greco, MDFullerton, CA 928351922032739
- John Jiao, MDFullerton, CA 928351407419070
- Scott Jones, MDFullerton, CA 928351740220094
- Iksoo Kang, MDFullerton, CA 928351093758393
- Kristine Koh, MDFullerton, CA 928351598712614
Common questions
What is Matthew McKay, MD's NPI number?
Matthew McKay, MD's National Provider Identifier (NPI) is 1184653966, issued on Jul 2, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Matthew McKay, MD located?
The NPPES record lists a practice address at 101 E Valencia Mesa Dr, Fullerton, CA, 92835. Phone: (714) 992-3965. Providers update this record themselves, so call before visiting.
How can I verify Matthew McKay, MD's license?
NPPES lists California license number G68542, 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 Matthew McKay, MD prescribe under Medicare Part D?
In 2024, Matthew McKay, MD had 537 Medicare Part D claims for 366 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is Matthew McKay, MD's MIPS final score?
The 2023 MIPS final score is 85 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.