Katherine Duffy, M.D.
Family Medicine Physician · Los Angeles, CA
Katherine Duffy, M.D. is a family medicine physician with a practice address in Los Angeles, California, and NPI 1881012433, issued on Apr 1, 2014. Check the license (California A166886, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Katherine Duffy
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A166886 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1625 Schrader Blvd, Los Angeles, CA 90028
- Phone
- (323) 993-7500
- Enumerated
- Apr 1, 2014
- Record last updated
- Apr 7, 2025
- Fax
- (323) 308-4456
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 1625 Schrader Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Katherine Duffy in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A166886Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
94% fewer Medicare Part D claims than the average family medicine physician in 2024
211 Medicare Part D claims for 31 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. 14 claims were for opioids.
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.
Katherine Duffy among 17,133 family medicine physician records in California
Katherine Duffy, M.D. is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2014, is newer than 71% of them.
- NPI issued2014 · 71% of these records are older, 26% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 62% of these records are
- Record last updated2025 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
829 family medicine physician records list a practice address in Los Angeles
They are 829 of the 69,537 NPPES records with a practice address in Los Angeles, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Los Angeles → Family Medicine Physician nationwide →
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Common questions
What is Katherine Duffy, M.D.'s NPI number?
Katherine Duffy, M.D.'s National Provider Identifier (NPI) is 1881012433, issued on Apr 1, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Katherine Duffy, M.D. located?
The NPPES record lists a practice address at 1625 Schrader Blvd, Los Angeles, CA, 90028. Phone: (323) 993-7500. Providers update this record themselves, so call before visiting.
How can I verify Katherine Duffy, M.D.'s license?
NPPES lists California license number A166886, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Katherine Duffy, M.D. prescribe under Medicare Part D?
In 2024, Katherine Duffy, M.D. had 211 Medicare Part D claims for 31 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.