Dr. David William Duncan, MD
- Medicare services, 2017
- 831
- Part D claims, 2019
- 12
- Industry payments
- $3,171
- Affiliated sites
- 1
- Medical group
- 1
- Practice address
- 1335 S Fairmont Ave, Lodi, CA 95240-5520
- Practice phone
- Call (209) 366-2007
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Kettleman Care Center
Primary care practice · Lodi, California
Find Dr. Duncan'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. David William Duncan is a family medicine physician in Lodi, California
Dr. Duncan practices at Kettleman Care Center in Lodi, California.
Dr. Duncan's NPI, 1790742146, was assigned on April 28, 2006. Dr. Duncan graduated from Loma Linda University School Of Medicine in 1985. Dr. Duncan's California license number on file is G59412.
- NPI
- 1790742146NPI Registry (opens in a new tab)
- NPI enumeration date
- April 28, 2006
- NPI status
- Active
- Practice phone
- (209) 366-2007
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Medical school graduation
- 1985
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. David William Duncan practices at Kettleman Care Center in Lodi, California
Dr. Duncan's primary practice is Kettleman Care Center, at 1335 S Fairmont Ave, Lodi, CA 95240-5520. The practice phone is (209) 366-2007.
- Kettleman Care Center1335 S Fairmont Ave, Lodi, CA 95240-5520Phone(209) 366-2007
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. David William Duncan is affiliated with 1 site of care and 1 medical group
Dr. Duncan's primary practice is Kettleman Care Center in Lodi, California. Dmand AI also links Dr. Duncan to 1 medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. David William Duncan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Duncan practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Kettleman Care Center | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. David William Duncan is one of 15,680 family medicine physicians in California
Family medicine is Dr. Duncan's primary specialty in the NPI Registry, under taxonomy code 207Q00000X. Dr. Duncan has a license on file in California.
Specialties and state licenses
- Family medicine, CaliforniaPrimary
Family medicine physicians near Dr. Duncan
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. David William Duncan billed Medicare for 831 services in 2017
CMS data shows 831 Medicare services from Dr. Duncan across 8 procedure codes in 2017. Medicare paid $51,599 for them. Every service was in an office.
Dr. Duncan's Medicare services by type, 2016 to 2017
- 2016
- 2017
- Office and hospital visits
- 2016: 1,2332017: 63349%
- Tests and treatments
- 2016: 1752017: 7358%
- Other services
- 2016: 1692017: 6562%
- Lab and pathology
- 2016: 612017: 602%
Dr. Duncan compared with the California median for family medicine physicians, 2017
- Dr. Duncan
- California median
- Medicare services
- 831vs 2463.4 times
- Part D claims
- 12vs 83399% below
Medians across 15,349 family medicine physicians in California with Dmand AI profiles that report each measure.
Dr. Duncan's most billed Medicare procedure codes, 2017
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. David William Duncan's patients have a median age of 78
Across all payers, Dmand AI patient panel data puts Dr. Duncan's median patient age at 78, with 28% women.
Dr. Duncan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 78
Patient panel by sex, all payers
- Women28%
- Men72%
Source: Dmand AI Patient Panel Data
Dr. David William Duncan wrote 12 Medicare Part D claims in 2019
In 2019, Dr. Duncan wrote 12 Medicare Part D claims. Every claim was for a generic drug. They cover 1 drug, with $431 in total drug cost. In 2018, CMS named 1,213 claims across 35 drugs.
Dr. Duncan's most prescribed drugs by claims, 2019
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, 2018 to 2019
- 2018
- 2019
- Claims for drugs CMS names
- 2018: 1,2132019: 1299%
Drugs named by CMS: 1 in 2019, 35 in 2018.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. David William Duncan received $3,171 in industry payments from 2016 to 2019
CMS Open Payments shows 199 general payments to Dr. Duncan from 22 drug and device companies from 2016 to 2019. Food and beverage make up the largest share, 100% of the total. AstraZeneca Pharmaceuticals LP paid the most, $511.
General payments to Dr. Duncan by program year, 2016 to 2019
Companies that paid Dr. Duncan the most, 2016 to 2019
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. David William Duncan graduated from Loma Linda University School Of Medicine
Dr. Duncan graduated from Loma Linda University School Of Medicine in 1985.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. David William Duncan'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 DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| 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) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile 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. David William Duncan
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. David William Duncan's NPI number?
Dr. David William Duncan's NPI number is 1790742146. It was assigned on April 28, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. David William Duncan?
Dr. David William Duncan is a family medicine physician in Lodi, California. The primary specialty in the NPI Registry is Family Medicine Physician (taxonomy code 207Q00000X).
Where does Dr. David William Duncan practice?
Dr. Duncan practices at 1335 S Fairmont Ave, Lodi, CA 95240-5520. Dr. Duncan's primary practice is Kettleman Care Center in Lodi, California. Dmand AI also links Dr. Duncan to 1 medical group.
What is Dr. David William Duncan's office phone number?
The practice phone on file for Dr. Duncan is (209) 366-2007.
What is Dr. David William Duncan's medical license number?
Dr. Duncan's California license number on file is G59412.
Does Dr. David William Duncan accept Medicare?
Yes. CMS data shows Dr. Duncan billed Medicare for 831 services in 2017.
What services does Dr. David William Duncan bill to Medicare?
In 2017, Dr. Duncan's most billed Medicare services were office visit, established patient (99214), office visit, established patient (99213) and lab and pathology test (85610).
Where did Dr. David William Duncan go to medical school?
Dr. Duncan graduated from Loma Linda University School Of Medicine in 1985.
What drugs does Dr. David William Duncan prescribe most?
In 2019 Medicare Part D data, Dr. Duncan's most prescribed drugs by claims were Divalproex Sodium.
Has Dr. David William Duncan received payments from drug or device companies?
CMS Open Payments shows $3,171 in general payments to Dr. Duncan from 22 companies from 2016 to 2019. The largest total came from AstraZeneca Pharmaceuticals LP.
How long has Dr. David William Duncan been practicing?
Dr. Duncan graduated from medical school in 1985, 41 years ago.
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