Brian Kay, D.O.
Anatomic Pathology & Clinical Pathology Physician · Mission Hills, CA
Brian Kay, D.O. is an anatomic pathology & clinical pathology physician with a practice address in Mission Hills, California, and NPI 1396036976, issued on Apr 29, 2011. Check the license (California 12868, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Brian Kay
- Credential
- D.O.
- Primary taxonomy
- Anatomic Pathology & Clinical Pathology Physician 207ZP0102X
- License number
- 12868 CA
Self-reported in NPPES; status is on the state search - Practice location
- 15031 Rinaldi St, Mission Hills, CA 91345
- Phone
- (818) 898-4412
- Enumerated
- Apr 29, 2011
- Record last updated
- Jan 17, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (818) 898-4419
- Medicare enrollment
- Enrolled (PECOS I20170822003556); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest anatomic pathology & clinical pathology physician records → All 1,554 in California → Look up another NPI →
Also registered at 15031 Rinaldi St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Marlyn Alejandro, P.T.Geriatric Physical Therapist1528265881
- Joanne Aquino, PA-CPhysician Assistant1740050012
- Brian Austin, PHARMDPharmacist1730022047
- Ali Azizi, M.D.Hospitalist Physician1225234529
- Lilit BazikyanFamily Nurse Practitioner1013840974
- Briana BegelferOccupational Therapist1174490205
Verify Brian Kay in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 12868Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The practice group's MIPS final score for 2023 (Medicare payment program): 100 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).
Bills Medicare through one group practice
- Pathology Associates OF Southern CaliforniaMission Hills, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Brian Kay among 1,554 anatomic pathology & clinical pathology physician records in California
Brian Kay, D.O. is one of 1,554 anatomic pathology & clinical pathology physician records with a practice address in California. 65% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2011, is newer than 70% of them.
- NPI issued2011 · 70% of these records are older, 27% newer
- In a Medicare fileYes · 65% of these records are
- In the CMS Doctors and Clinicians fileYes · 57% of these records are
- Graduated2011 · median 2003 among the 891 with a school on file
- Record last updated2018 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207ZP0102X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Anatomic Pathology & Clinical Pathology Physician providers in California
There are 1,554 anatomic pathology & clinical pathology physician records in California.
All 1,554 in California → Every provider in Mission Hills → Anatomic Pathology & Clinical Pathology Physician nationwide →
The 8 anatomic pathology & clinical pathology physician records with the nearest ZIP codes
- Gretchen Sampson, M.D.Mission Hills, CA 913451063406528
- John Yamashita, M.D.Mission Hills, CA 913451558355024
- Simon Backer, MDSylmar, CA 913421487283925
- Douglas Kahn, MDSylmar, CA 913421922156546
- Paul Liu, M.D.Sylmar, CA 913421013044981
- John Sacoolidge, MDSylmar, CA 913421447285820
- Joanna Young, MDSylmar, CA 913421912399783
- Basel Kashlan, M.D.Valencia, CA 913551295983278
Common questions
What is Brian Kay, D.O.'s NPI number?
Brian Kay, D.O.'s National Provider Identifier (NPI) is 1396036976, issued on Apr 29, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Brian Kay, D.O. located?
The NPPES record lists a practice address at 15031 Rinaldi St, Mission Hills, CA, 91345. Phone: (818) 898-4412. Providers update this record themselves, so call before visiting.
How can I verify Brian Kay, D.O.'s license?
NPPES lists California license number 12868, 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.
What is Brian Kay, D.O.'s MIPS final score?
The 2023 MIPS final score is 100 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.