Stanley H. Ma, P.A.
Physician Assistant · Sunnyvale, CA
Stanley H. Ma, P.A. is a physician assistant with a practice address in Sunnyvale, California, and NPI 1871881755, issued on Jul 13, 2011. Check the license (California PA21685, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Stanley H. Ma
- Credential
- P.A.
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- PA21685 CA
Self-reported in NPPES; status is on the state search - Practice location
- 301 Old San Francisco RD, Sunnyvale, CA 94086
- Phone
- (408) 730-4360
- Enumerated
- Jul 13, 2011
- Record last updated
- Sep 2, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20110831000293); 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 301 Old San Francisco RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Aisha AminInternal Medicine Physician1013440981
- Joyce Ang, MDPediatrics Physician1346634698
- Lulua Bahrainwala, MD, MSFamily Medicine Physician1568949709
Verify Stanley H. Ma in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PA21685Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
73% fewer Medicare Part D claims than the average physician assistant in 2024
222 Medicare Part D claims for 105 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. Brand-name drugs were 20% of claims. 16 claims were for opioids.
Most prescribed
- Pantoprazole Sodium16 claims
- Citalopram Hbr15 claims
- Paxlovid14 claims
- Albuterol Sulfate Hfa13 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
- Sutter Bay Medical FoundationSunnyvale, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Stanley H. Ma among 14,451 physician assistant records in California
Stanley H. Ma, P.A. 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 2011, is newer than 30% of them.
- NPI issued2011 · 30% of these records are older, 67% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated2011 · median 2018 among the 7,214 with a school on file
- Record last updated2021 · 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).
27 physician assistant records list a practice address in Sunnyvale
They are 27 of the 1,690 NPPES records with a practice address in Sunnyvale, and 14,451 physician assistant records in California.
All 14,451 in California → Every provider in Sunnyvale → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Arthur BonhamSunnyvale, CA 940861063587228
- Jean Cho, PA-CSunnyvale, CA 940861073663969
- Harvey Chong, PA-CSunnyvale, CA 940861982070744
- Lauren Dodd, PA-CSunnyvale, CA 940861932451663
- Jenny Duong, PASunnyvale, CA 940861083460307
- Jeffrey Lam, PA-CSunnyvale, CA 940861851022735
- Lisa LeeSunnyvale, CA 940861649844812
- Madeleine Ma, PA-CSunnyvale, CA 940861376158907
Common questions
What is Stanley H. Ma, P.A.'s NPI number?
Stanley H. Ma, P.A.'s National Provider Identifier (NPI) is 1871881755, issued on Jul 13, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Stanley H. Ma, P.A. located?
The NPPES record lists a practice address at 301 Old San Francisco RD, Sunnyvale, CA, 94086. Phone: (408) 730-4360. Providers update this record themselves, so call before visiting.
How can I verify Stanley H. Ma, P.A.'s license?
NPPES lists California license number PA21685, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Stanley H. Ma, P.A. prescribe under Medicare Part D?
In 2024, Stanley H. Ma, P.A. had 222 Medicare Part D claims for 105 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.