Thien Nguyen, MD, PHD
NPI 1639123938 · Neurology Physician · Rockville, MD
Enrolled with Medicare as Practitioner - Neurology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Thien Nguyen, MD, PHD is a Neurology Physician provider in Rockville, MD (NPI 1639123938).
Provider details
- NPI number
- 1639123938
- Entity type
- Individual
- Primary specialty
- Neurology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD, PHD
- Sex
- Male
- Sole proprietor
- Yes
- License
- D0062240 (MD)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
1,332 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 616 | $100 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 224 | $141 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205 | 180 | $240 |
| Needle Measurement of Electrical Activity in Arm Or Leg Muscles, Complete Study95886 | 109 | $107 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 102 | $184 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 37 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Donepezil Hcl | 175 | 59 |
| Carbidopa/Levodopabrand: Carbidopa-Levodopa | 141 | 47 |
| Memantine Hcl | 132 | 34 |
| Gabapentin | 110 | 39 |
| Tramadol Hcl | 63 | 17 |
| Topiramate | 56 | 20 |
| Primidone | 53 | 15 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$2,280 across 124 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
- 2006-05-20
- Last updated
- 2024-07-13
- Certified
- 2024-07-13
Frequently asked questions
- What is Thien Nguyen's NPI number?
- Thien Nguyen's National Provider Identifier (NPI) is 1639123938, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Thien Nguyen's specialty?
- Thien Nguyen is listed in the NPPES registry with a primary specialty of Neurology Physician (Allopathic & Osteopathic Physicians).
- Where is Thien Nguyen located?
- Thien Nguyen's practice location on file with NPPES is 9707 Medical Center Dr Ste 220, Rockville, MD 20850-6338.
- What is Thien Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Thien Nguyen is (240) 477-5973.
- Does Thien Nguyen accept Medicare?
- Thien Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Thien Nguyen's NPI active?
- Yes — Thien Nguyen's NPI (1639123938) is active in the NPPES registry as of the last update on 2024-07-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.