William Nghiem, MD
NPI 1851559223 · Vascular & Interventional Radiology Physician · Germantown, MD
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Nghiem, MD is a Vascular & Interventional Radiology Physician provider in Germantown, MD (NPI 1851559223).
Provider details
- NPI number
- 1851559223
- Entity type
- Individual
- Primary specialty
- Vascular & Interventional Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- D78132 (MD)
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
18 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
511 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) |
|---|---|---|
| Use of a Drug to Induce Depression of Consciousness By Physician Performing a Procedure (5 Years Or Older), Initial 15 Minutes99152 | 94 | $57 |
| Use of a Drug to Induce Depression of Consciousness By Physician Performing a Procedure, Each Additional 15 Minutes99153 | 85 | $14 |
| Fluoroscopic Guidance for Insertion Or Removal of Central Vein Access Device77001 | 78 | $112 |
| Ultrasonic Guidance for Blood Vessel Access76937 | 76 | $43 |
| Insertion of Central Venous Tube With Port (5 Years Or Older)36561 | 68 | $1,090 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 64 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$672 across 22 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
- 2008-06-01
- Last updated
- 2015-06-26
Frequently asked questions
- What is William Nghiem's NPI number?
- William Nghiem's National Provider Identifier (NPI) is 1851559223, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Nghiem's specialty?
- William Nghiem is listed in the NPPES registry with a primary specialty of Vascular & Interventional Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is William Nghiem located?
- William Nghiem's practice location on file with NPPES is 20410 Observation Drive, Germantown, MD 20876-3201.
- What is William Nghiem's phone number?
- The practice phone number listed in the NPPES registry for William Nghiem is (301) 212-4264.
- Does William Nghiem accept Medicare?
- William Nghiem is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Nghiem's NPI active?
- Yes — William Nghiem's NPI (1851559223) is active in the NPPES registry as of the last update on 2015-06-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.