Naiem Nassiri, MD

Medicare activity in 2024

Official CMS public-use data for Naiem Nassiri, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.

Most frequent services

1. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)49 services
2. Ultrasound study of one arm or leg veins with compression and maneuvers (93971)41 services
3. Ultrasound evaluation of blood vessel with review by radiologist, each additional vessel (37253)36 services
4. New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)26 services
5. Ultrasound study of arm or leg veins with compression and maneuvers (93970)21 services

Chronic conditions among these patients

Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).

• High cholesterol75%
• High blood pressure70%
• Arthritis56%
• Ischemic heart disease35%
• Depression28%
• Anxiety28%

Hospitals where Naiem Nassiri works

Medicare's Facility Affiliation Data lists Naiem Nassiri at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.

• Danbury HospitalDanbury, CT · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 070033
• Greenwich Hospital Association -Greenwich, CT · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 070018
• Norwalk HospitalNorwalk, CT · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 070034
• Stamford HospitalStamford, CT · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 070006

Practice locations

Addresses where Naiem Nassiri is enrolled with Medicare (CMS data updated October 2, 2026).

• 330 Boston Post Rd, Suite 240Darien, CT 06820 (203) 548‑7858

Group practices

Medicare enrollment lists Naiem Nassiri as a member of this group (CMS data updated October 2, 2026).

• Vascular Ct PLLC5 clinicians in the group

Specialties

• Vascular Surgeryprimary

Find other Vascular Surgery doctors in Connecticut →

Other vascular surgeons in Darien

Clinicians with the same Medicare primary specialty in Darien, CT — not a recommendation.

• John Gedney
• Paul Gagne, MD
• Jonathan Bowman
• Chong L. Li, MD
• Timothy M. Manoni, MD
• Andrew Lazar, MD

All vascular surgeons in Darien →

Other clinicians in Vascular Ct PLLC

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

• Paul Gagne, MD
• Chong L. Li, MD
• Andrew Lazar, MD

Clinician information

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
6. Medicare Care Compare — official Medicare tool to look up clinicians