DR. NAIEM NASSIRI MD
NPI 1033366745
Surgery - Vascular Surgery in Darien, CT
About Dr. Naiem Nassiri Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. NAIEM NASSIRI MD (NPI 1033366745) is an individual vascular surgery provider in Darien, Connecticut, licensed in Connecticut (56696) and active in the NPI registry since August 2008. He is enrolled in Medicare PECOS, maintains a secondary practice location in New Haven, and is a graduate of Oregon Health Sciences University School Of Medicine (2008).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Group Practice 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Naiem Nassiri Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Naiem Nassiri reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Darien, CT 06820
- Reassigned Medicare billing, Connecticut enrollment
- 5 clinicians in this Medicare group
New Haven, CT 06519
- Reassigned Medicare billing, Connecticut enrollment
- 3,728 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 13
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 06820 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 4
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Naiem Nassiri's NPI number?
The NPI number for Naiem Nassiri is 1033366745. It was assigned to this individual provider in the NPPES registry on August 25, 2008.
Where is Naiem Nassiri located?
Naiem Nassiri practices at 330 Boston Post Rd Ste 240, Darien, CT 06820. The listed phone number is (203) 548-7858.
What is Naiem Nassiri's specialty?
The primary specialty registered for this NPI is Surgery, specializing in Vascular Surgery, with taxonomy code 2086S0129X.
Is Naiem Nassiri enrolled in Medicare?
Yes. Naiem Nassiri is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Naiem Nassiri's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Naiem Nassiri reassigns Medicare benefits to 2 organizations: Vascular Ct, PLLC (Darien, CT) and Yale University (New Haven, CT). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Naiem Nassiri's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Naiem Nassiri accept?
Health plans from Anthem Blue Cross and Blue Shield list Naiem Nassiri as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Naiem Nassiri was last updated on March 4, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Naiem Nassiri, MD · NPI 1033366745
Vascular Surgery physician in Darien, Connecticut. Individual provider, active in the CMS NPPES registry since August 25, 2008.
## Identity
- **NPI:** 1033366745 (Entity type: Individual)
- **Enumerated:** August 25, 2008
- **Primary specialty:** Surgery - Vascular Surgery · taxonomy 2086S0129X
- **State license:** 56696 (Connecticut)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 330 BOSTON POST RD STE 240, Darien, CT 06820-3667
- **Phone:** (203) 548-7858 · **Fax:** (203) 439-4839
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Vascular Ct, PLLC (NPI 1649943424, Darien, CT); Yale University (NPI 1124148887, New Haven, CT) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Oregon Health Sciences University School Of Medicine, class of 2008
## Record status
- **NPPES last updated:** March 4, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1033366745) · Data from the CMS NPPES public registry.