DAN S NGUYEN (M.D.) – Family Medicine Physician, NPI 1235198334
Family Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
1,900 FAMILY PRACTICE in MA
Loading map...
Provider Addresses for DAN S NGUYEN (M.D.)
10;12, Adams Street, North Chelmsford, Chelmsford, Middlesex County, Massachusetts, 08163, United States
N CHELMSFORD, MA 018631746
Phone: (978) 251-3159
Fax: (978) 251-0636
Mailing address matches the actual address.
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
Loading prescription activity...
Open Payments (CMS)
CMS reports 6 Open Payments records for all available years, with a total value of $337.
Total Amount is formed as General ($337) + Research ($0) + Ownership ($0) = $337.
Last reported payment date: 2024-11-23 • Largest payer in this snapshot: IZI Medical Products, LLC ($238).
Total Amount
$337
General + Research + Ownership
Payments
6
Total payment records
General Amount
$337
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-11-23
Latest reported date
Top Companies
Largest payers in this snapshot
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2008-06-02
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20080602000251 | I | Family Practice | MA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 181 | 138 | $0 |
| G0439 | Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 176 | 176 | $0 |
| G0444 | Annual depression screening, 5 to 15 minutes | 156 | 156 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 152 | 108 | $0 |
| G0008 | Administration of influenza virus vaccine | 130 | 128 | $0 |
Insurance plans in this area (ZIP 01863)
Loading plans...
Group practice members
| Name | Specialty | State |
|---|---|---|
| Family Practice | MA | |
| Nurse Practitioner | MA | |
| Family Practice | MA | |
| Nurse Practitioner | MA | |
| Nurse Practitioner | MA | |
| - | MA | |
| Physician Assistant | MA | |
| Family Practice | MA | |
| - | MA | |
| Family Practice | NH |
Reviews
All reviews are moderated before publication. Reviews reflect users' opinions; we do not verify the accuracy of individual reviews.
No reviews yet. Be the first to share your experience — your opinion helps families compare providers.