DR. NAIEM NASSIRI MD
NPI 1033366745
Surgery - Vascular Surgery in Darien, CT

Q: 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.

Q: What is Naiem Nassiri's specialty?

The primary specialty registered for this NPI is Surgery, specializing in Vascular Surgery, with taxonomy code 2086S0129X.

Q: 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 5 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.

Active since August 25, 2008PECOS EnrolledAccepts Medicare Assignment

73.56/100

CMS Quality Rating

330 BOSTON POST RD STE 240, DARIEN, CT 06820(203) 548-7858(203) 439-4839 Get Directions Write a Review

NPPES record last updated: March 4, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Mar 4, 2026, Dec 4, 2025, Jul 21, 2022 and 2 more (5 updates tracked since 2017).

On this page

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

NPI1033366745

Entity TypeIndividualMale

Primary Taxonomy2086S0129X

Provider Legal NameDR. NAIEM NASSIRICredential: MD

Location Address330 BOSTON POST RD STE 240Darien, CT 06820-3667

Mailing Address330 Boston Post Rd Ste 240Darien, CT 06820-3667 · (203) 548-7858

Phone(203) 548-7858

Fax(203) 439-4839

Sole ProprietorYes

Medical School CMSOregon Health Sciences University School Of MedicineGraduated 2008

Enumeration DateAugust 25, 2008

Last NPPES UpdateMarch 4, 20265 updates tracked since enumeration

NPPES CertifiedMarch 4, 2026

✔ NPI 1033366745 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtySurgery · Vascular SurgeryAllopathic & Osteopathic Physicians

Taxonomy Code2086S0129X

Licenses✔ Licensed in CT · 56696✔ Licensed in NJ · 25MA09308000

Definition

A surgeon with expertise in the management of surgical disorders of the blood vessels, excluding the intracranial vessels or the heart.

Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X

330 BOSTON POST RD STE 240, Darien, CT 06820

Open in Google Maps ↗

Secondary Practice Location 1

Location 1Yale University, 330 Cedar Street, Boardman Building 204New Haven, CT 06510 · Phone (818) 388-8899

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

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.

PECOS PAC ID6002059276

PECOS Enrollment IDI20170831001456

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

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.

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

49 services32 patients

Ultrasound study of one arm or leg veins with compression and maneuvers 93971

This is a non-invasive procedure using sound waves to visualize veins in an arm or leg. It involves applying gentle pressure and performing certain movements. It helps identify any abnormal blood flow or clots, ensuring vascular health.

41 services20 patients

Ultrasound evaluation of blood vessel with review by radiologist, each additional vessel 37253

An ultrasound evaluation of a blood vessel is a non-invasive procedure that uses sound waves to create images of your blood vessels. A radiologist reviews these images to check for any abnormalities. If additional vessels need reviewing, the process is repeated.

36 services14 patients

New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203

This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.

26 services26 patients

Ultrasound study of arm or leg veins with compression and maneuvers 93970

An ultrasound study of arm or leg veins with compression and maneuvers is a non-invasive procedure that uses sound waves to create images of your veins. This helps identify blood clots or other vein problems. During the procedure, pressure is applied to the veins and certain movements are performed to assess blood flow.

21 services17 patients

Ultrasound evaluation of blood vessel with review by radiologist, initial vessel 37252

This procedure involves using ultrasound, a safe imaging technique, to examine your blood vessels. The images are then reviewed by a radiologist, a doctor specialized in medical imaging. The process helps identify any abnormalities in your initial vessel.

20 services17 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

17 services15 patients

Ultrasound study of arm and leg arteries 93922

An ultrasound study of arm and leg arteries is a non-invasive procedure that uses sound waves to create images of your arteries. It helps in checking blood flow, identifying blockages, or detecting other abnormalities in your arteries.

15 services12 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

15 services15 patients

Ultrasonic guidance for blood vessel access 76937

Ultrasonic guidance for blood vessel access is a medical procedure where sound waves are used to create images of your blood vessels. This helps doctors to accurately locate and access the vessels for treatments or tests, ensuring safety and precision.

12 services11 patients

Ultrasound of both sides of head and neck blood flow 93880

An ultrasound of the head and neck blood flow is a safe, non-invasive procedure that uses sound waves to create images of blood vessels. It helps detect abnormalities like blockages or clots, ensuring optimal blood flow.

12 services12 patients

New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more 99205

This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.

12 services12 patients

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215

This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.

12 services11 patients

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.

New Patient

$93.86 typical visit price

range $60.82 – $183.10

Typical copayment $23.46 (range $15.20 – $45.77)

Most-billed visit code 99203

Established Patient

$75.55 typical visit price

range $19.76 – $149.26

Typical copayment $18.88 (range $4.94 – $37.31)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

73.56/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored as part of a group practice

Quality

75.84

Promoting Interoperability

Improvement Activities

Cost

51.43

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.

ANDREW LAZAR

Surgery (Vascular Surgery)

330 BOSTON POST RD STE 240
DARIEN, CT 06820

Western Connecticut Planning Region (203) 548-7858

CHONG LINUS LI MD

Surgery (Vascular Surgery)

330 BOSTON POST RD STE 240
DARIEN, CT 06820

Western Connecticut Planning Region (203) 548-7858

JACKLYN TRUONG NP

Nurse Practitioner

330 BOSTON POST RD STE 240
DARIEN, CT 06820

Western Connecticut Planning Region (203) 548-7858

DR. JOHN RYAN GEDNEY MD

Surgery (Vascular Surgery)

330 BOSTON POST RD STE 240
DARIEN, CT 06820

Western Connecticut Planning Region (203) 548-7858

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.

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 5 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.