Dan Nguyen, M.D.
NPI 1235198334 · Family Medicine Physician · N Chelmsford, MA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Dan Nguyen, M.D. is a Family Medicine Physician provider in N Chelmsford, MA (NPI 1235198334).
Provider details
- NPI number
- 1235198334
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 209069 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,347 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. 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 .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 204 | $141 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 198 | $98 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 178 | $137 |
| Annual Depression Screening, 5 to 15 MinutesG0444 | 168 | $21 |
| Administration of Influenza Virus VaccineG0008 | 142 | $35 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'S |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 103 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 676 | 173 |
| Amlodipine Besylate | 502 | 114 |
| Levothyroxine Sodium | 396 | 70 |
| Lisinopril | 368 | 104 |
| Omeprazole | 359 | 81 |
| Losartan Potassium | 324 | 90 |
| Simvastatin | 253 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$100 across 5 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-03-20
- Last updated
- 2008-05-15
Frequently asked questions
- What is Dan Nguyen's NPI number?
- Dan Nguyen's National Provider Identifier (NPI) is 1235198334, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Dan Nguyen's specialty?
- Dan Nguyen is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Dan Nguyen located?
- Dan Nguyen's practice location on file with NPPES is 10 Adams St, N Chelmsford, MA 01863-1746.
- What is Dan Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Dan Nguyen is (978) 251-3159.
- Does Dan Nguyen accept Medicare?
- Dan Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Dan Nguyen's NPI active?
- Yes — Dan Nguyen's NPI (1235198334) is active in the NPPES registry as of the last update on 2008-05-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.