Kathryn Underwood
Physician Assistant · Los Angeles, CA
Kathryn Underwood is a physician assistant with a practice address in Los Angeles, California, and NPI 1093945792, issued on Jul 16, 2009. Check the license (California PA55934, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Kathryn Underwood
- Primary taxonomy
- Physician Assistant 363A00000X
- License numbers
- PA55934 CA
013380 NY
Self-reported in NPPES; status is on the state search - Practice location
- 311 Winston St, Los Angeles, CA 90013
- Phone
- (213) 215-2804
- Enumerated
- Jul 16, 2009
- Record last updated
- Jun 17, 2020 (not updated in 6 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 14,451 in California → Look up another NPI →
Also registered at 311 Winston St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Kathryn Underwood in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PA55934Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average physician assistant in 2024
86 Medicare Part D claims for 33 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D.
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.
Kathryn Underwood among 14,451 physician assistant records in California
Kathryn Underwood 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 2009, is newer than 25% of them.
- NPI issued2009 · 25% of these records are older, 73% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 50% of these records are
- Record last updated2020 · 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).
935 physician assistant records list a practice address in Los Angeles
They are 935 of the 69,537 NPPES records with a practice address in Los Angeles, and 14,451 physician assistant records in California.
All 14,451 in California → Every provider in Los Angeles → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Jennifer Chun, P.A.-CLos Angeles, CA 900131346476918
- Kacie Condon, PA-CLos Angeles, CA 900131942924907
- Cullen GrayLos Angeles, CA 900131487369799
- Pierre Houbein, PA-CLos Angeles, CA 900131417298753
- Lauren Anne Layson, PA-CLos Angeles, CA 900131487047940
- Rebekah NguyenLos Angeles, CA 900131093188765
- Briana Paxton, PA-CLos Angeles, CA 900131275076606
- Katherine Phan Yee, P.A.Los Angeles, CA 900131982970786
Common questions
What is Kathryn Underwood's NPI number?
Kathryn Underwood's National Provider Identifier (NPI) is 1093945792, issued on Jul 16, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Kathryn Underwood located?
The NPPES record lists a practice address at 311 Winston St, Los Angeles, CA, 90013. Phone: (213) 215-2804. Providers update this record themselves, so call before visiting.
How can I verify Kathryn Underwood's license?
NPPES lists California license number PA55934, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Kathryn Underwood prescribe under Medicare Part D?
In 2024, Kathryn Underwood had 86 Medicare Part D claims for 33 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.