Dr. Katherine Duffy, MD
- Part D claims, 2024
- 211
- Industry payments
- $2,368
- Affiliated sites
- 1
- Medical group
- 1
- Insurance carriers
- 14
- Practice address
- 1625 N Schrader Blvd, Los Angeles, CA 90028
- Practice phone
- Call (323) 993-7400
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Jeffrey Goodman Special Care Clinic
FQHC - Main Site · Los Angeles, California
Find Dr. Duffy's professional email, personal email and mobile number
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Dr. Katherine Duffy is a family medicine physician in Los Angeles, California
Dr. Duffy practices at Jeffrey Goodman Special Care Clinic in Los Angeles, California.
Dr. Duffy's NPI, 1881012433, was assigned on April 1, 2014. Dr. Duffy graduated from University of Illinois College of Medicine - Chicago in 2014. Dr. Duffy's California license number on file is A166886.
- NPI
- 1881012433NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4385927904
- NPI enumeration date
- April 1, 2014
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (323) 993-7400
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 38
- Medical school graduation
- 2014
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Katherine Duffy practices at Jeffrey Goodman Special Care Clinic in Los Angeles, California
Dr. Duffy's primary practice is Jeffrey Goodman Special Care Clinic, at 1625 N Schrader Blvd, Los Angeles, CA 90028 in Los Angeles County. The practice phone is (323) 993-7400.
- Jeffrey Goodman Special Care Clinic1625 N Schrader Blvd, Los Angeles, CA 90028 · Los Angeles CountyPhone(323) 993-7400
Source: Dmand AI Affiliation Data
Dr. Katherine Duffy is affiliated with 1 site of care and 1 medical group
Dr. Duffy's primary practice is Jeffrey Goodman Special Care Clinic in Los Angeles, California. The medical group on file is Los Angeles LGBT Center. Dr. Duffy's employer is on file too: a community health center (fqhc).
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Katherine Duffy's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Duffy practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Jeffrey Goodman Special Care Clinic | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Katherine Duffy is one of 15,680 family medicine physicians in California
Family medicine is Dr. Duffy's primary specialty in the NPI Registry, under taxonomy code 207Q00000X. Dr. Duffy is board certified in family medicine by the American Board of Family Medicine. Dmand AI has Dr. Duffy's licenses on file in 2 states: California and Illinois.
Specialties and state licenses
- Family medicine, CaliforniaPrimary
- Illinois license
Clinical focus
Dmand AI lists acne, adjustment disease, chronic diabetes, cirrhosis of the liver, contact dermatitis, erectile dysfunction, fluid and electrolyte imbalances and itchy rashes among the conditions Dr. Duffy treats.
Family medicine physicians near Dr. Duffy
Counts of family medicine physicians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Katherine Duffy's patients have a median age of 39
Across all payers, Dmand AI patient panel data puts Dr. Duffy's median patient age at 39, with 29% women.
Dr. Duffy's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 39
Patient panel by sex, all payers
- Women29%
- Men67%
Source: Dmand AI Patient Panel Data
Dr. Katherine Duffy wrote 211 Medicare Part D claims in 2024
In 2024, Dr. Duffy wrote 211 Medicare Part D claims for 31 patients. 75% of them were for generic drugs. CMS names the drug for 40 of them, across 3 drugs with 11 or more claims each, at $2,070 in total drug cost. In 2022, CMS named 89 claims across 7 drugs.
Dr. Duffy's Part D claims by kind of drug, 2024
- Generic158 claims75%
- Brand-name and other53 claims25%
Dr. Duffy's most prescribed drugs by claims, 2023
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Duffy's Part D claims, 2024
- Opioids7%14 of 211 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2022 to 2023
- 2022
- 2023
- Claims for drugs CMS names
- 2022: 892023: 4055%
Drugs named by CMS: 3 in 2023, 7 in 2022.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Katherine Duffy takes part in Medicare
Dr. Duffy accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Katherine Duffy received $2,368 in industry payments from 2017 to 2025
CMS Open Payments shows 48 general payments to Dr. Duffy from 6 drug and device companies from 2017 to 2025. Travel and lodging make up the largest share, 57% of the total. Gilead Sciences, Inc. paid the most, $1,753.
General payments to Dr. Duffy by program year, 2017 to 2025
General payments to Dr. Duffy by kind, 2017 to 2025
- Travel and lodging$1,33857%
- Food and beverage$1,03043%
Companies that paid Dr. Duffy the most, 2017 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Katherine Duffy graduated from University of Illinois College of Medicine - Chicago
Dr. Duffy graduated from University of Illinois College of Medicine - Chicago in 2014.
- Medical school
- Board certified in family medicine
Source: Dmand AI Professional Profile Data
Dr. Katherine Duffy accepts plans from 14 insurance carriers
Dr. Duffy is in network with 14 carriers, including Blue Cross Blue Shield of Michigan, United Healthcare and Elevance. PPO plans come from the most carriers, 9. Check the plan with the practice before a visit.
- Blue Cross Blue Shield of Michigan
- United Healthcare
- Elevance
- HCSC
- Aetna
- Blue Cross Blue Shield of Massachusetts
- Molina
- Regence Health Plans
- +6 more carriersWith a free account
Plan types Dr. Duffy accepts, by number of carriers
- PPO9
- HMO7
- Medicare6
- EPO3
- POS3
Source: Dmand AI Insurance Network Data
Sources for Dr. Katherine Duffy's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Katherine Duffy
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Katherine Duffy's NPI number?
Dr. Katherine Duffy's NPI number is 1881012433. It was assigned on April 1, 2014, and it is active in the NPI Registry.
What kind of doctor is Dr. Katherine Duffy?
Dr. Katherine Duffy is a family medicine physician in Los Angeles, California. The primary specialty in the NPI Registry is Family Medicine Physician (taxonomy code 207Q00000X).
Where does Dr. Katherine Duffy practice?
Dr. Duffy practices at 1625 N Schrader Blvd, Los Angeles, CA 90028. Dr. Duffy's primary practice is Jeffrey Goodman Special Care Clinic in Los Angeles, California.
What is Dr. Katherine Duffy's office phone number?
The practice phone on file for Dr. Duffy is (323) 993-7400.
What is Dr. Katherine Duffy's medical license number?
Dr. Duffy's California license number on file is A166886, one of the licenses on file in 2 states.
Which states has Dr. Katherine Duffy been licensed in?
Dmand AI has state licenses on file for Dr. Duffy in California (2019 to 2025) and Illinois (2014 to 2020).
What medical group is Dr. Katherine Duffy part of?
Dr. Duffy is linked to Los Angeles LGBT Center.
Does Dr. Katherine Duffy accept Medicare?
Yes. CMS lists Dr. Duffy as accepting Medicare assignment.
Is Dr. Katherine Duffy board certified?
Yes. Dr. Duffy is board certified in family medicine by the American Board of Family Medicine.
Where did Dr. Katherine Duffy go to medical school?
Dr. Duffy graduated from University of Illinois College of Medicine - Chicago in 2014.
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What drugs does Dr. Katherine Duffy prescribe most?
In 2023 Medicare Part D data, Dr. Duffy's most prescribed drugs by claims were Estradiol (Twice Weekly), Spironolactone and Estradiol.
Has Dr. Katherine Duffy received payments from drug or device companies?
CMS Open Payments shows $2,368 in general payments to Dr. Duffy from 6 companies from 2017 to 2025. The largest total came from Gilead Sciences, Inc.
How long has Dr. Katherine Duffy been practicing?
Dr. Duffy graduated from medical school in 2014, 12 years ago.
What insurance does Dr. Katherine Duffy accept?
Dr. Duffy is in network with 14 carriers, including Blue Cross Blue Shield of Michigan, United Healthcare and Elevance. PPO plans come from the most carriers, 9. Check the plan with the practice before a visit.
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