Naiem Nassiri, MD
NPI 1033366745 · Vascular Surgery Physician · Darien, CT
Enrolled with Medicare as Practitioner - Vascular Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Naiem Nassiri, MD is a Vascular Surgery Physician provider in Darien, CT (NPI 1033366745).
Provider details
- NPI number
- 1033366745
- Entity type
- Individual
- Primary specialty
- Vascular Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 25MA09308000 (NJ)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
17 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
288 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 | 49 | $95 |
| Ultrasound Study of One Arm Or Leg Veins With Compression and Maneuvers93971 | 41 | $117 |
| Ultrasound Evaluation of Blood Vessel With Review By Radiologist, Each Additional Vessel37253 | 36 | $181 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 26 | $117 |
| Ultrasound Study of Arm Or Leg Veins With Compression and Maneuvers93970 | 21 | $198 |
| Ultrasound Evaluation of Blood Vessel With Review By Radiologist, Initial Vessel37252 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 2 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Clopidogrel Bisulfatebrand: Clopidogrel | 66 | 29 |
| Prednisone | 21 | 12 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$31,828 across 80 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
Additional practice locations (1)
- Yale University330 Cedar Street, Boardman Building 204New Haven, CT 06510Phone: (818) 388-8899
Registry dates
- Enumerated
- 2008-08-25
- Last updated
- 2026-03-04
- Certified
- 2026-03-04
Frequently asked questions
- What is Naiem Nassiri's NPI number?
- Naiem Nassiri's National Provider Identifier (NPI) is 1033366745, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Naiem Nassiri's specialty?
- Naiem Nassiri is listed in the NPPES registry with a primary specialty of Vascular Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Naiem Nassiri located?
- Naiem Nassiri's practice location on file with NPPES is 330 Boston Post Rd Ste 240, Darien, CT 06820-3667.
- What is Naiem Nassiri's phone number?
- The practice phone number listed in the NPPES registry for Naiem Nassiri is (203) 548-7858.
- Does Naiem Nassiri accept Medicare?
- Naiem Nassiri is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Naiem Nassiri's NPI active?
- Yes — Naiem Nassiri's NPI (1033366745) is active in the NPPES registry as of the last update on 2026-03-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.