Mark Jason Diaz, PA-C, MS, MPH
Physician Assistant · Davis, CA
Mark Jason Diaz, PA-C, MS, MPH is a physician assistant with a practice address in Davis, California, and NPI 1164942116, issued on Jun 21, 2017. Check the license (California 54564, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mark Jason Diaz
- Credential
- PA-C, MS, MPH
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- 54564 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2020 Sutter PL Ste 104, Davis, CA 95616
- Phone
- (530) 750-5900
- Enumerated
- Jun 21, 2017
- Record last updated
- Jul 3, 2017 (not updated in 9 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20170823000947); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 14,451 in California → Look up another NPI →
Also registered at 2020 Sutter PL Ste 104
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Tennyson Block, MDOrthopaedic Hand Surgery Physician1538553714
- Cyrus Taghavi, M.D.Orthopaedic Foot and Ankle Surgery Physician1316268519
- Jeannette Tan-Grey, PAPhysician Assistant1306566120
- Valeria Wang, PA-CPhysician Assistant1962250241
Verify Mark Jason Diaz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 54564Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
69% fewer Medicare Part D claims than the average physician assistant in 2024
258 Medicare Part D claims for 93 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. 119 claims were for opioids.
Most prescribed
- Ondansetron Odt79 claims
- Oxycodone-Acetaminophen69 claims
- Oxycodone Hcl28 claims
- Meloxicam19 claims
- Hydrocodone-Acetaminophen18 claims
- Ketorolac Tromethamine15 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
- Permanente Medical Group IncVallejo, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Jason Diaz among 14,451 physician assistant records in California
Mark Jason Diaz, PA-C, MS, MPH is one of 14,451 physician assistant records with a practice address in California. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2017, is newer than 47% of them.
- NPI issued2017 · 47% of these records are older, 48% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated2017 · median 2018 among the 7,214 with a school on file
- Record last updated2017 · 40% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Physician Assistant providers in California
There are 14,451 physician assistant records in California.
All 14,451 in California → Every provider in Davis → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Anne Marie Bisson, PADavis, CA 956161154333201
- Nidia Chaves-Ochoa, P.A.Davis, CA 956161285713784
- John Douthitt, P.A.Davis, CA 956161124107602
- Aaron Drumright, PADavis, CA 956161710098330
- Joel Grey, PA-CDavis, CA 956161285989988
- Mary Howell, PAC FNPDavis, CA 956161790725075
- Madison KatzenmeyerDavis, CA 956161306680483
- Alyssa Kesling, PADavis, CA 956161871981001
Common questions
What is Mark Jason Diaz, PA-C, MS, MPH's NPI number?
Mark Jason Diaz, PA-C, MS, MPH's National Provider Identifier (NPI) is 1164942116, issued on Jun 21, 2017. An NPI identifies a provider in billing; it is not a license.
Where is Mark Jason Diaz, PA-C, MS, MPH located?
The NPPES record lists a practice address at 2020 Sutter PL Ste 104, Davis, CA, 95616. Phone: (530) 750-5900. Providers update this record themselves, so call before visiting.
How can I verify Mark Jason Diaz, PA-C, MS, MPH's license?
NPPES lists California license number 54564, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Mark Jason Diaz, PA-C, MS, MPH prescribe under Medicare Part D?
In 2024, Mark Jason Diaz, PA-C, MS, MPH had 258 Medicare Part D claims for 93 beneficiaries; the average among physician assistant prescribers was 830. 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.