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Dr. Michael Sean Duffy Sr., DO
NPI1851399802
- Medicare services, 2022
- 1,298
- Part D claims, 2024
- 35
- Publications
- 11
- Industry payments
- $50
- Medical group
- 1
- Practice address
- 995 Gateway Center Way, San Diego, CA 92102
- Practice phone
- Call (619) 263-9729
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Southern California Vein Care
San Diego, California
Find Dr. Duffy's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Michael Sean Duffy Sr. is an internist in San Diego, California
Dr. Duffy practices at Southern California Vein Care in San Diego, California.
Dr. Duffy's NPI, 1851399802, was assigned on July 13, 2005. Dr. Duffy graduated from Kansas City University of Medicine and Biosciences College of Osteopathic Medicine in 1994. Dr. Duffy holds California license 20A9616.
NPI and contact details
- NPI
- 1851399802NPI Registry (opens in a new tab)
- NPI enumeration date
- July 13, 2005
- NPI status
- Active
- Practice phone
- (619) 263-9729
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 58
- Medical school graduation
- 1994
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. Michael Sean Duffy Sr. practices at Southern California Vein Care in San Diego, California
Dr. Duffy's primary practice is Southern California Vein Care, at 995 Gateway Center Way, San Diego, CA 92102 in San Diego County. The practice phone is (619) 263-9729.
- Southern California Vein Care995 Gateway Center Way, San Diego, CA 92102 · San Diego CountyPhone(619) 263-9729
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Michael Sean Duffy Sr. is affiliated with 1 site of care and 1 medical group
Dr. Duffy's primary practice is Southern California Vein Care in San Diego, California. The medical group on file is San Diego Coastal Endocrinology Group.
Southern California Vein CarePrimary
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Michael Sean Duffy Sr.'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 |
|---|---|
| Southern California Vein Care | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
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Dr. Michael Sean Duffy Sr. is one of 16,751 internists in California
Internal medicine is Dr. Duffy's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Duffy is board certified in 2006 - 2025 by the CA State License. Dr. Duffy is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Internists near Dr. Duffy
Counts of internists 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. Michael Sean Duffy Sr. billed Medicare for 1,298 services in 2022
CMS data shows 1,298 Medicare services from Dr. Duffy across 10 procedure codes in 2022. Medicare paid $79,405 for them. Every service was in an office.
Medicare services, 20221,298
Paid by Medicare$79,405
Procedure codes10
Dr. Duffy's Medicare services by type, 2021 to 2022
- 2021
- 2022
- Office and hospital visits
- 2021: 2,0542022: 45678%
- Tests and treatments
- 2021: 2,0742022: 35583%
- Lab and pathology
- 2021: 1,3682022: 28379%
- Surgery
- 2021: 3962022: 12269%
- Other services
- 2021: 902022: 4253%
- Drugs given in the office
- 2021: 4062022: 4090%
Dr. Duffy compared with the California median for internists, 2022
- Dr. Duffy
- California median
- Medicare services
- 1,298vs 3613.6 times
- Part D claims
- 207vs 42151% below
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Duffy's most billed Medicare procedure codes, 2022
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Duffy?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Duffy and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Michael Sean Duffy Sr.'s patients have a median age of 46
Across all payers, Dmand AI patient panel data puts Dr. Duffy's median patient age at 46, with 45% 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 46
Patient panel by sex, all payers
- Women45%
- Men52%
Source: Dmand AI Patient Panel Data
Dr. Michael Sean Duffy Sr. wrote 35 Medicare Part D claims in 2024
In 2024, Dr. Duffy wrote 35 Medicare Part D claims. 100% of them were for generic drugs. They cover 13 drugs, with $13,153 in total drug cost. In 2019, CMS named 2,055 claims across 68 drugs.
Part D claims, 202435
Drugs named by CMS13
Total drug cost$13,153
Dr. Duffy's most prescribed drugs by claims, 2020
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2019 to 2020
- 2019
- 2020
- Claims for drugs CMS names
- 2019: 2,0552020: 20790%
Drugs named by CMS: 13 in 2020, 68 in 2019.
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
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Dr. Michael Sean Duffy Sr. has 11 publications on record
Dmand AI links 11 papers to Dr. Duffy in 2011. The most frequent topics are Deer, Strongylida Infections and Metastrongyloidea. Dr. Duffy has published most often in J Parasitol.
Papers11
Topics Dr. Duffy writes about most
- Deer
- Strongylida Infections
- Metastrongyloidea
- Amino Acid Sequence
- Antibodies, Helminth
- Feces
- Gene Library
- Molecular Sequence Data
Recent publications by Dr. Duffy
Amino Acid SequenceCathepsin BGene Expression Regulation, Developmental
Ascaridida InfectionsAscaridoideaDirofilaria
See who Dr. Duffy researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Duffy works with, so you can find a warm path to the right internists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Michael Sean Duffy Sr. received $50 in industry payments from 2024 to 2025
CMS Open Payments shows 2 general payments to Dr. Duffy from 2 drug and device companies from 2024 to 2025. Food and beverage make up the largest share, 100% of the total. Kestra Medical Technology Services, Inc. paid the most, $26.
General payments to Dr. Duffy by program year, 2024 to 2025
Companies that paid Dr. Duffy the most, 2024 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Michael Sean Duffy Sr. graduated from Kansas City University of Medicine and Biosciences College of Osteopathic Medicine
Dr. Duffy graduated from Kansas City University of Medicine and Biosciences College of Osteopathic Medicine in 1994.
- Medical school
- Board certified in 2006 - 2025
- Board certified in 2006 - 2027
Source: Dmand AI Professional Profile Data
Dr. Michael Sean Duffy Sr. accepts plans from 2 insurance carriers
Dr. Duffy is in network with 2 carriers, including Aetna and Molina. HMO plans come from the most carriers, 2. Check the plan with the practice before a visit.
- Aetna
- Molina
Plan types Dr. Duffy accepts, by number of carriers
- HMO2
- Medicare2
- PPO1
Source: Dmand AI Insurance Network Data
Sources for Dr. Michael Sean Duffy Sr.'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| 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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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. Michael Sean Duffy Sr.
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. Michael Sean Duffy Sr.'s NPI number?
Dr. Michael Sean Duffy Sr.'s NPI number is 1851399802. It was assigned on July 13, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Michael Sean Duffy Sr.?
Dr. Michael Sean Duffy Sr. is an internist in San Diego, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Michael Sean Duffy Sr. practice?
Dr. Duffy practices at 995 Gateway Center Way, San Diego, CA 92102. Dr. Duffy's primary practice is Southern California Vein Care in San Diego, California.
What is Dr. Michael Sean Duffy Sr.'s office phone number?
The practice phone on file for Dr. Duffy is (619) 263-9729.
What is Dr. Michael Sean Duffy Sr.'s medical license number?
Dr. Duffy holds California license 20A9616.
What medical group is Dr. Michael Sean Duffy Sr. part of?
Dr. Duffy is linked to San Diego Coastal Endocrinology Group.
Does Dr. Michael Sean Duffy Sr. accept Medicare?
Yes. CMS data shows Dr. Duffy billed Medicare for 1,298 services in 2022.
Is Dr. Michael Sean Duffy Sr. board certified?
Yes. Dr. Duffy is board certified in 2006 - 2025 by the CA State License.
What services does Dr. Michael Sean Duffy Sr. bill to Medicare?
In 2022, Dr. Duffy's most billed Medicare services were office visit, established patient (99213), lab and pathology test (80307) and health assessment (96116).
Where did Dr. Michael Sean Duffy Sr. go to medical school?
Dr. Duffy graduated from Kansas City University of Medicine and Biosciences College of Osteopathic Medicine in 1994.
Show 5 more questionsShow fewer questions
What drugs does Dr. Michael Sean Duffy Sr. prescribe most?
In 2020 Medicare Part D data, Dr. Duffy's most prescribed drugs by claims were Buprenorphine-Naloxone, Olanzapine and Quetiapine Fumarate.
Has Dr. Michael Sean Duffy Sr. received payments from drug or device companies?
CMS Open Payments shows $50 in general payments to Dr. Duffy from 2 companies from 2024 to 2025. The largest total came from Kestra Medical Technology Services, Inc.
How long has Dr. Michael Sean Duffy Sr. been practicing?
Dr. Duffy graduated from medical school in 1994, 32 years ago.
Does Dr. Michael Sean Duffy Sr. do research?
Dmand AI links 11 publications to Dr. Duffy.
What insurance does Dr. Michael Sean Duffy Sr. accept?
Dr. Duffy is in network with 2 carriers, including Aetna and Molina. HMO plans come from the most carriers, 2. Check the plan with the practice before a visit.
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