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DR. IOANNIS TASSIULAS M.D.
NPI 1215227988
Internal Medicine - Rheumatology in New York, NY

Active since April 14, 2011PECOS Enrolled
5 E 98TH ST, NEW YORK, NY 10029(212) 241-1671 Get Directions Write a Review

NPPES record last updated: February 22, 2019. Verified against the NPPES registry weekly; last sync: November 08, 2026.

About Dr. Ioannis Tassiulas M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. IOANNIS TASSIULAS M.D. (NPI 1215227988) is an individual rheumatology provider in New York, New York, licensed in New York (233519) and active in the NPI registry since April 2011. He is enrolled in Medicare PECOS and maintains a secondary practice location in Hawthorne.

NPPES Registry Identity

NPI1215227988
Entity TypeIndividualMale
Primary Taxonomy207RR0500X
Provider Legal NameDR. IOANNIS TASSIULASCredential: M.D.
Location Address5 E 98TH STNew York, NY 10029
Mailing Address1 Gustave L Levy Pl # 3000New York, NY 10029-6504
Phone(212) 241-1671
Sole ProprietorNo
Enumeration DateApril 14, 2011
Last NPPES UpdateFebruary 22, 2019
✔ NPI 1215227988 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · RheumatologyAllopathic & Osteopathic Physicians
Taxonomy Code207RR0500X
License✔ Licensed in NY · 233519
Definition
An internist who treats diseases of joints, muscle, bones and tendons. This specialist diagnoses and treats arthritis, back pain, muscle strains, common athletic injuries and collagen diseases.
5 E 98TH ST, New York, NY 10029
Open in Google Maps ↗

Secondary Practice Location 1

Location 119 Bradhurst Ave, Suite 3090Hawthorne, NY 10532-0000 · Phone (914) 372-7887 · Fax (914) 372-7884

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Ioannis Tassiulas M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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.

Medicare Billing Reassignments

2

Medicare enrollment records show Ioannis Tassiulas reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Icahn School Of Medicine At Mount Sinai
0.1 mi
Otolaryngology
5 E 98TH ST, BOX 1191
New York, NY 10029
  • Reassigned Medicare billing, New York enrollment
  • Also billed through NPI 1043571086 (New York)
  • 345 clinicians in this Medicare group
NPI 1538407176 (212) 241-9410
Westchester Medical Center Advanced Physician Services PC
22 mi
Anesthesiology
100 WOODS RD, TAYLOR PAVILION - ROOM M229
Valhalla, NY 10595
  • Reassigned Medicare billing, New York enrollment
  • 1,663 clinicians in this Medicare group
NPI 1740687458 (914) 493-2844

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 2

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 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.
278 services146 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.
50 services50 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 10029 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
$150.24 typical visit price
range $65.69 – $198.19
Typical copayment $37.56 (range $16.42 – $49.54)
Most-billed visit code 99204
Established Patient
$114.88 typical visit price
range $21.20 – $160.66
Typical copayment $28.72 (range $5.30 – $40.16)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

REBECCA BARZI NP
Nurse Practitioner (Family)
5 E 98TH ST
NEW YORK, NY 10029
New York County (212) 241-0764
BELINDA YEW PHD
Psychologist (Clinical)
5 E 98TH ST
NEW YORK, NY 10029
New York County (929) 224-3803
JADEN BAYE-CIGNA PA-C
Physician Assistant
5 E 98TH ST
NEW YORK, NY 10029
New York County (212) 241-9728
SUPINDA BUNYAVANICH M.D.
Allergy & Immunology
5 E 98TH ST
NEW YORK, NY 10029
New York County (212) 241-5548
DR. SHELDON LICHTBLAU M.D.
Orthopaedic Surgery
5 E 98TH ST, BOX 1188
NEW YORK, NY 10029
New York County (212) 241-1645
DR. YOUSAF ALI MD
Internal Medicine (Rheumatology)
5 E 98TH ST
NEW YORK, NY 10029
New York County (212) 659-9210
MRS. LESLIE CARLSON SCHLACHTER PA
Physician Assistant
5 E 98TH ST, 6TH FLOOR UROLOGY
NEW YORK, NY 10029
New York County (212) 241-5629
ORTHOPEDICS 2 DEPARTMENT OF MOUNT SINAI
Specialist
5 E 98TH ST
NEW YORK, NY 10029
New York County (212) 241-8892

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 Ioannis Tassiulas's NPI number?

The NPI number for Ioannis Tassiulas is 1215227988. It was assigned to this individual provider in the NPPES registry on April 14, 2011.

Where is Ioannis Tassiulas located?

Ioannis Tassiulas practices at 5 E 98th St, New York, NY 10029. The listed phone number is (212) 241-1671.

What is Ioannis Tassiulas's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Rheumatology, with taxonomy code 207RR0500X.

Is Ioannis Tassiulas enrolled in Medicare?

Yes. Ioannis Tassiulas is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Ioannis Tassiulas's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ioannis Tassiulas reassigns Medicare benefits to 2 organizations: Icahn School Of Medicine At Mount Sinai (New York, NY) and Westchester Medical Center Advanced Physician Services PC (Valhalla, NY). 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 Ioannis Tassiulas's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Ioannis Tassiulas was last updated on February 22, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 years 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.