Dien D. Nguyen, OD
- Medicare patients, 2024
- 15
- Part D claims, 2024
- 96
- Hospital affiliations
- 1
- Industry payments
- $224
- Medical group
- 1
- Practice address
- 901 Nevin Ave, Richmond, CA 94801
- Practice phone
- Call (510) 307-1555
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Richmond Medical Center
Richmond, California
Find Dien Nguyen'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.
Dien D. Nguyen is an optometrist in Richmond, California
Dien Nguyen practices at Richmond Medical Center in Richmond, California.
Dien Nguyen's NPI, 1770636557, was assigned on January 18, 2007. Dien Nguyen holds California license 11458T.
- NPI
- 1770636557NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6608026604
- NPI enumeration date
- January 18, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (510) 307-1555
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 52
- Medical school graduation
- 2000
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dien D. Nguyen practices at Richmond Medical Center in Richmond, California
Dien Nguyen's primary practice is Richmond Medical Center, at 901 Nevin Ave, Richmond, CA 94801 in Contra Costa County. The practice phone is (510) 307-1555.
- Richmond Medical Center901 Nevin Ave, Richmond, CA 94801 · Contra Costa CountyPhone(510) 307-1555
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dien D. Nguyen is affiliated with 2 sites of care and 1 medical group
Dien Nguyen's primary practice is Richmond Medical Center in Richmond, California. Dien Nguyen is also affiliated with Fremont Medical Center. The medical group on file is The Permanente Medical Group, Inc.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dien D. Nguyen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dien Nguyen practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Richmond 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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Dien D. Nguyen is one of 7,206 optometrists in California
Optometrist is Dien Nguyen's primary specialty in the NPI Registry, under taxonomy code 152W00000X. Dien Nguyen is licensed in California.
Specialties and state licenses
- Optometrist, CaliforniaPrimary
Optometrists near Dien Nguyen
Counts of optometrists 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
Dien D. Nguyen treated 15 Medicare patients in 2024, average age 68
CMS counts 15 Medicare patients who saw Dien Nguyen in 2024. 75% of them have diabetes. Their average risk score is 0.99, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dien Nguyen's median patient age at 56, with 62% women.
Chronic conditions among Dien Nguyen's Medicare patients, 2024
- Diabetes75%
Share of Medicare patients with each condition. A patient can have several.
Dien Nguyen's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 56
Patient panel by sex, all payers
- Women62%
- Men38%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dien D. Nguyen wrote 96 Medicare Part D claims in 2024
In 2024, Dien Nguyen wrote 96 Medicare Part D claims for 38 patients. 90% of them were for generic drugs.
Dien Nguyen's Part D claims by kind of drug, 2024
- Generic86 claims90%
- Brand-name and other10 claims10%
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dien D. Nguyen takes part in Medicare
Dien Nguyen 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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Dien D. Nguyen received $224 in industry payments in 2025
CMS Open Payments shows 2 general payments to Dien Nguyen from 2 drug and device companies in 2025. Food and beverage make up the largest share, 100% of the total. CooperVision Inc. paid the most, $124.
Companies that paid Dien Nguyen the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dien D. Nguyen'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 DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | 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 Dien D. Nguyen
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dien D. Nguyen's NPI number?
Dien D. Nguyen's NPI number is 1770636557. It was assigned on January 18, 2007, and it is active in the NPI Registry.
What does Dien D. Nguyen specialize in?
Dien D. Nguyen is an optometrist in Richmond, California. The primary specialty in the NPI Registry is Optometrist (taxonomy code 152W00000X).
Where does Dien D. Nguyen practice?
Dien Nguyen practices at 901 Nevin Ave, Richmond, CA 94801. Dien Nguyen's primary practice is Richmond Medical Center in Richmond, California.
What is Dien D. Nguyen's office phone number?
The practice phone on file for Dien Nguyen is (510) 307-1555.
What is Dien D. Nguyen's medical license number?
Dien Nguyen holds California license 11458T.
Which hospitals is Dien D. Nguyen affiliated with?
Dien Nguyen is affiliated with Fremont Medical Center.
What medical group is Dien D. Nguyen part of?
Dien Nguyen is linked to The Permanente Medical Group, Inc.
Does Dien D. Nguyen accept Medicare?
Yes. CMS lists Dien Nguyen as accepting Medicare assignment.
How many Medicare patients does Dien D. Nguyen see?
CMS counts 15 Medicare patients who saw Dien Nguyen in 2024, with an average age of 68.
Has Dien D. Nguyen received payments from drug or device companies?
CMS Open Payments shows $224 in general payments to Dien Nguyen from 2 companies from 2025 to 2025. The largest total came from CooperVision Inc.
How long has Dien D. Nguyen been practicing?
Dien Nguyen graduated from medical school in 2000, 26 years ago.
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