Ellen Liao, PA-C
Physician Assistant · San Francisco, CA
Ellen Liao, PA-C is a physician assistant with a practice address in San Francisco, California, and NPI 1417129156, issued on Apr 1, 2008. Check the license (California PA19453, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Ellen Liao
- Credential
- PA-C
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- PA19453 CA
Self-reported in NPPES; status is on the state search - Practice location
- 450 6TH Ave FL 5, San Francisco, CA 94118
- Phone
- (415) 833-2291
- Enumerated
- Apr 1, 2008
- Record last updated
- May 31, 2022
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 14,451 in California → Look up another NPI →
Also registered at 450 6TH Ave FL 5
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- David Yen, PA-CSurgical Physician Assistant1396802005
Verify Ellen Liao in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PA19453Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
60% fewer Medicare Part D claims than the average physician assistant in 2024
335 Medicare Part D claims for 117 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. Brand-name drugs were 6% of claims. 93 claims were for opioids.
Most prescribed
- Oxycodone Hcl82 claims
- Ondansetron Odt74 claims
- Meloxicam64 claims
- Pantoprazole Sodium57 claims
- Pradaxa12 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.
Ellen Liao among 14,451 physician assistant records in California
Ellen Liao, PA-C 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 2008, is newer than 22% of them.
- NPI issued2008 · 22% of these records are older, 75% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 50% of these records are
- Record last updated2022 · 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 San Francisco → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Veronika Archer, PA-CSan Francisco, CA 941181659424190
- Gloria Cheng, PASan Francisco, CA 941181548662109
- Richard Dibella, PASan Francisco, CA 941181134169410
- Eric Dyer, PA-CSan Francisco, CA 941181316289192
- Linda Gourley, PH.D., PA-CSan Francisco, CA 941181558584912
- Pamela Ibanez, PA-CSan Francisco, CA 941181225408768
- Sarah Makin, MPAS, PA-CSan Francisco, CA 941181629596481
- Kelly Newhouse, P.A.-CSan Francisco, CA 941181639230147
Common questions
What is Ellen Liao, PA-C's NPI number?
Ellen Liao, PA-C's National Provider Identifier (NPI) is 1417129156, issued on Apr 1, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Ellen Liao, PA-C located?
The NPPES record lists a practice address at 450 6TH Ave FL 5, San Francisco, CA, 94118. Phone: (415) 833-2291. Providers update this record themselves, so call before visiting.
How can I verify Ellen Liao, PA-C's license?
NPPES lists California license number PA19453, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Ellen Liao, PA-C prescribe under Medicare Part D?
In 2024, Ellen Liao, PA-C had 335 Medicare Part D claims for 117 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.