Dat Nguyen, MD
NPI 1659346435 · Specialist · Modesto, CA
Enrolled with Medicare as Practitioner - Colorectal Surgery (proctology) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Dat Nguyen, MD is a Specialist provider in Modesto, CA (NPI 1659346435).
Provider details
- NPI number
- 1659346435
- Entity type
- Individual
- Primary specialty
- SpecialistOther Service Providers
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G75447 (CA)
Specialties & taxonomies
Other Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 5 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ondansetron Hcl | 43 | 42 |
| Oxycodone Hcl | 35 | 34 |
| Metronidazole | 26 | 22 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-C | 25 | 22 |
| Neomycin Sulfate | 25 | 22 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-02-23
- Last updated
- 2022-01-10
Frequently asked questions
- What is Dat Nguyen's NPI number?
- Dat Nguyen's National Provider Identifier (NPI) is 1659346435, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Dat Nguyen's specialty?
- Dat Nguyen is listed in the NPPES registry with a primary specialty of Specialist (Other Service Providers).
- Where is Dat Nguyen located?
- Dat Nguyen's practice location on file with NPPES is 4601 Dale Rd, Modesto, CA 95356-9718.
- What is Dat Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Dat Nguyen is (209) 735-4385.
- Does Dat Nguyen accept Medicare?
- Dat Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Dat Nguyen's NPI active?
- Yes — Dat Nguyen's NPI (1659346435) is active in the NPPES registry as of the last update on 2022-01-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.