Dr. David Duc Diep, DO
- Part D claims, 2024
- 6,049
- Industry payments
- $50
- Affiliated sites
- 1
- Medical group
- 1
- State license
- 1
- Practice address
- 9961 Sierra Ave, Fontana, CA 92335
- Practice phone
- Call (909) 427-3910
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Fontana Medical Center
Fontana, California
Find Dr. Diep'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 Duc Diep is a family medicine physician in Fontana, California
Dr. Diep practices at Fontana Medical Center in Fontana, California.
Dr. Diep's NPI, 1750651485, was assigned on January 11, 2012. Dr. Diep holds California license 20A12549.
- NPI
- 1750651485NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7113241308
- NPI enumeration date
- January 11, 2012
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (909) 427-3910
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 41
- Medical school graduation
- 2011
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. David Duc Diep practices at Fontana Medical Center in Fontana, California
Dr. Diep's primary practice is Fontana Medical Center, at 9961 Sierra Ave, Fontana, CA 92335 in San Bernardino County. The practice phone is (909) 427-3910.
- Fontana Medical Center9961 Sierra Ave, Fontana, CA 92335 · San Bernardino CountyPhone(909) 427-3910
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. David Duc Diep is affiliated with 2 sites of care and 1 medical group
Dr. Diep's primary practice is Fontana Medical Center in Fontana, California. The medical group on file is Southern California Permanente Medical Group. Dmand AI also links Dr. Diep to 1 more group practice or clinic, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. David Duc Diep's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Diep practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Fontana Medical Center | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. David Duc Diep is one of 15,680 family medicine physicians in California
Family medicine is Dr. Diep's primary specialty in the NPI Registry, under taxonomy code 207Q00000X. Dr. Diep is licensed in California.
Specialties and state licenses
- Family medicine, CaliforniaPrimary
Family medicine physicians near Dr. Diep
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 Duc Diep's patients have a median age of 48
Across all payers, Dmand AI patient panel data puts Dr. Diep's median patient age at 48, with 51% women.
Dr. Diep's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 48
Patient panel by sex, all payers
- Women51%
- Men49%
Source: Dmand AI Patient Panel Data
Dr. David Duc Diep wrote 6,049 Medicare Part D claims in 2024
In 2024, Dr. Diep wrote 6,049 Medicare Part D claims for 1,271 patients. 87% of them were for generic drugs. CMS names the drug for 5,496 of them, across 95 drugs with 11 or more claims each, at $293,223 in total drug cost. In 2023, CMS named 4,887 claims across 91 drugs.
Dr. Diep's Part D claims by kind of drug, 2024
- Generic5,266 claims87%
- Brand-name654 claims11%
- Other129 claims2%
Dr. Diep's most prescribed drugs by claims, 2024
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. Diep's Part D claims, 2024
- Opioids5%279 of 6,049 claims
- Antibiotics2%110 of 6,049 claims
- Antipsychotics, patients 65 and over1%31 of 6,049 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, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 4,8872024: 5,49612%
Drugs named by CMS: 95 in 2024, 91 in 2023.
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
Dr. David Duc Diep offers telehealth to Medicare patients
Dr. Diep accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Diep as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
For MedTech and pharma teams
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Dr. David Duc Diep received $50 in industry payments in 2016
CMS Open Payments shows 1 general payment to Dr. Diep from 1 drug or device company in 2016. Food and beverage make up the largest share, 100% of the total. Janssen Pharmaceuticals, Inc paid the most, $50.
Companies that paid Dr. Diep the most, 2016 to 2016
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. David Duc Diep'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 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) |
| 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 Duc Diep
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 Duc Diep's NPI number?
Dr. David Duc Diep's NPI number is 1750651485. It was assigned on January 11, 2012, and it is active in the NPI Registry.
What kind of doctor is Dr. David Duc Diep?
Dr. David Duc Diep is a family medicine physician in Fontana, California. The primary specialty in the NPI Registry is Family Medicine Physician (taxonomy code 207Q00000X).
Where does Dr. David Duc Diep practice?
Dr. Diep practices at 9961 Sierra Ave, Fontana, CA 92335. Dr. Diep's primary practice is Fontana Medical Center in Fontana, California. Dmand AI also links Dr. Diep to 1 group practice or clinic.
What is Dr. David Duc Diep's office phone number?
The practice phone on file for Dr. Diep is (909) 427-3910.
What is Dr. David Duc Diep's medical license number?
Dr. Diep holds California license 20A12549.
What medical group is Dr. David Duc Diep part of?
Dr. Diep is linked to Southern California Permanente Medical Group.
Does Dr. David Duc Diep accept Medicare?
Yes. CMS lists Dr. Diep as accepting Medicare assignment.
Does Dr. David Duc Diep offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Diep as offering telehealth services.
What drugs does Dr. David Duc Diep prescribe most?
In 2024 Medicare Part D data, Dr. Diep's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Lisinopril.
Has Dr. David Duc Diep received payments from drug or device companies?
CMS Open Payments shows $50 in general payments to Dr. Diep from 1 company from 2016 to 2016. The largest total came from Janssen Pharmaceuticals, Inc.
How long has Dr. David Duc Diep been practicing?
Dr. Diep graduated from medical school in 2011, 15 years ago.
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