Stephen Styadi, PHYSICIAN ASSISTANT
Medical Physician Assistant · Ontario, CA
Stephen Styadi, PHYSICIAN ASSISTANT is a medical physician assistant with a practice address in Ontario, California, and NPI 1093024994, issued on Sep 27, 2010. Check the license (California PA21209, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Stephen Styadi
- Credential
- PHYSICIAN ASSISTANT
- Primary taxonomy
- Medical Physician Assistant 363AM0700X
- License number
- PA21209 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1760 E Flora St, Ontario, CA 91764
- Phone
- (909) 641-5703
- Enumerated
- Sep 27, 2010
- Record last updated
- Oct 24, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (760) 949-1236
- Medicare enrollment
- Enrolled (PECOS I20120201000912); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest medical physician assistant records → All 3,376 in California → Look up another NPI →
Verify Stephen Styadi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PA21209Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
46% fewer Medicare Part D claims than the average medical physician assistant in 2024
615 Medicare Part D claims for 360 beneficiaries, against an average of 1,148 among the 23,801 providers of this specialty who prescribed in Part D. 16 claims were for opioids.
Most prescribed
- Prednisone46 claims
- Lisinopril33 claims
- Ciclopirox27 claims
- Doxycycline Monohydrate24 claims
- Omeprazole22 claims
- Amlodipine Besylate21 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
- Southern California Permanente Medical GroupFontana, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Stephen Styadi among 3,376 medical physician assistant records in California
Stephen Styadi, PHYSICIAN ASSISTANT is one of 3,376 medical physician assistant records with a practice address in California. 69% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 42% of them.
- NPI issued2010 · 42% of these records are older, 54% newer
- In a Medicare fileYes · 69% of these records are
- In the CMS Doctors and Clinicians fileYes · 40% of these records are
- Graduated2010 · median 2012 among the 1,347 with a school on file
- Record last updated2021 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363AM0700X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Medical Physician Assistant providers in California
There are 3,376 medical physician assistant records in California.
All 3,376 in California → Every provider in Ontario → Medical Physician Assistant nationwide →
The 8 medical physician assistant records with the nearest ZIP codes
- Sakina Abowath, P.A.Diamond Bar, CA 917651326287525
- Esther Agepogu, PA-CMontclair, CA 917631982846499
- Silvia Alonzo, MS, PA-CDiamond Bar, CA 917651942586623
- Teresa Anderson, P.A.Diamond Bar, CA 917651215205091
- Charinda Charoen, P.A.Montclair, CA 917631437440625
- Joann Enderica, PAMontclair, CA 917631992120042
- Michael Lance, P.A.-CMontclair, CA 917631740310531
- Esther Loya, P.A.CMontclair, CA 917631548557309
Common questions
What is Stephen Styadi, PHYSICIAN ASSISTANT's NPI number?
Stephen Styadi, PHYSICIAN ASSISTANT's National Provider Identifier (NPI) is 1093024994, issued on Sep 27, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Stephen Styadi, PHYSICIAN ASSISTANT located?
The NPPES record lists a practice address at 1760 E Flora St, Ontario, CA, 91764. Phone: (909) 641-5703. Providers update this record themselves, so call before visiting.
How can I verify Stephen Styadi, PHYSICIAN ASSISTANT's license?
NPPES lists California license number PA21209, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Stephen Styadi, PHYSICIAN ASSISTANT prescribe under Medicare Part D?
In 2024, Stephen Styadi, PHYSICIAN ASSISTANT had 615 Medicare Part D claims for 360 beneficiaries; the average among medical physician assistant prescribers was 1,148. 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.