Tammy Nguyen, M.D.
NPI 1356736839 · Vascular Surgery Physician · Worcester, MA
Enrolled with Medicare as Practitioner - Vascular Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Tammy Nguyen, M.D. is a Vascular Surgery Physician provider in Worcester, MA (NPI 1356736839).
Provider details
- NPI number
- 1356736839
- Entity type
- Individual
- Primary specialty
- Vascular Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 283226 (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
11 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
310 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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 76 | $97 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 57 | $174 |
| Removal of Muscle And/Or Tissue, 20.0 Sq Cm Or Less11043 | 43 | $142 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 38 | $131 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 25 | $132 |
| Removal of Skin and Tissue, 20.0 Sq Cm Or Less11042 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$487 across 19 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
- 2015-04-01
- Last updated
- 2020-11-05
- Certified
- 2020-11-05
Frequently asked questions
- What is Tammy Nguyen's NPI number?
- Tammy Nguyen's National Provider Identifier (NPI) is 1356736839, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Tammy Nguyen's specialty?
- Tammy Nguyen is listed in the NPPES registry with a primary specialty of Vascular Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Tammy Nguyen located?
- Tammy Nguyen's practice location on file with NPPES is 55 Lake Ave N, Worcester, MA 01655-0002.
- What is Tammy Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Tammy Nguyen is (508) 856-5599.
- Does Tammy Nguyen accept Medicare?
- Tammy Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Tammy Nguyen's NPI active?
- Yes — Tammy Nguyen's NPI (1356736839) is active in the NPPES registry as of the last update on 2020-11-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.