Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. GEORGE MASTROMIHALIS DDS
NPI 1992765689
Dentist - Endodontics in New York, NY

Q: What is George Mastromihalis's NPI number?

The NPI number for George Mastromihalis is 1992765689. It was assigned to this individual provider in the NPPES registry on March 25, 2006.

Q: What is George Mastromihalis's specialty?

The primary specialty registered for this NPI is Dentist, specializing in Endodontics, with taxonomy code 1223E0200X.

Q: Is George Mastromihalis enrolled in Medicare?

No. George Mastromihalis has opted out of Medicare through December 28, 2027. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

Active since March 25, 2006Opted out of Medicare · through Dec 28, 2027

225 BROADWAY, NEW YORK, NY 10007(212) 732-7400(212) 732-0267 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 23, 2026.

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About Dr. George Mastromihalis Dds NPPES

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

DR. GEORGE MASTROMIHALIS DDS (NPI 1992765689) is an individual endodontics provider in New York, New York, licensed in New York (050032) and active in the NPI registry since March 2006. He has opted out of Medicare through December 28, 2027 and remains eligible to order and refer.

NPPES Registry Identity

NPI1992765689

Entity TypeIndividualMale

Primary Taxonomy1223E0200X

Provider Legal NameDR. GEORGE MASTROMIHALISCredential: DDS

Location Address225 BROADWAYNew York, NY 10007-3001

Mailing Address225 BroadwayNew York, NY 10007-3001 · (212) 732-7400 · Fax (212) 732-0267

Phone(212) 732-7400

Fax(212) 732-0267

Sole ProprietorNo

Enumeration DateMarch 25, 2006

Last NPPES UpdateJuly 13, 2026

✔ NPI 1992765689 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyDentist · EndodonticsDental Providers

Taxonomy Code1223E0200X

License✔ Licensed in NY · 050032

Definition

The branch of dentistry that is concerned with the morphology, physiology and pathology of the human dental pulp and periradicular tissues. Its study and practice encompass the basic and clinical sciences including biology of the normal pulp, the etiology, diagnosis, prevention and treatment of diseases and injuries of the pulp and associated periradicular conditions.

225 BROADWAY, New York, NY 10007

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Other Identifiers 1

Medicaid02672755NY

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include BEST Life, Blue Cross and Blue Shield of Montana, Blue Cross and Blue Shield of Oklahoma and more.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

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Opted out of Medicare

Dr. George Mastromihalis Dds has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from December 28, 2015 through December 28, 2027.

Opt-Out Effective DateDecember 28, 2015

Opt-Out In Effect ThroughDecember 28, 2027Opt-out affidavits renew automatically every two years unless cancelled

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency– Power Mobility DevicesAn opted-out provider can still order and refer for Medicare patients in the categories marked above, even though their own services are not covered.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 10007 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

$102.04 typical visit price

range $65.69 – $198.19

Typical copayment $25.51 (range $16.42 – $49.54)

Most-billed visit code 99203

Established Patient

$81.44 typical visit price

range $21.20 – $160.66

Typical copayment $20.36 (range $5.30 – $40.16)

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.

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.

DR. KAMRAN FOROUGHI DDS

Dentist (Endodontics)

225 BROADWAY
NEW YORK, NY 10007

New York County (212) 732-7400

DR. PAUL I COHEN JR.

Dentist (General Practice)

225 BROADWAY
NEW YORK, NY 10007

New York County (212) 732-7400

LANA GAITON PSYCHOLOGICAL SERVICES

Psychologist (Clinical)

225 BROADWAY, SUITE 3400
NEW YORK, NY 10007

New York County (347) 613-2708

DR. DIANA FOSHA PHD

Psychologist (Clinical)

225 BROADWAY, SUITE 3400
NEW YORK, NY 10007

New York County (212) 645-8465

JOEL GOLD PHYSICIAN P.C.

Psychiatry & Neurology (Psychiatry)

225 BROADWAY, SUITE 3400
NEW YORK, NY 10007

New York County (212) 566-2426

JEFFREY ROUSE

Dentist (Prosthodontics)

225 BROADWAY, MEZZANINE LEVEL
NEW YORK, NY 10007

New York County (212) 374-9500

MICHAEL LAZARA

Physical Therapist

225 BROADWAY
NEW YORK, NY 10007

New York County (212) 732-2100

DR. LILLIAN T LI MD

Obstetrics & Gynecology

225 BROADWAY, SUITE 303
NEW YORK, NY 10007

New York County (212) 732-9773

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 George Mastromihalis's NPI number?

The NPI number for George Mastromihalis is 1992765689. It was assigned to this individual provider in the NPPES registry on March 25, 2006.

Where is George Mastromihalis located?

George Mastromihalis practices at 225 Broadway, New York, NY 10007. The listed phone number is (212) 732-7400.

What is George Mastromihalis's specialty?

The primary specialty registered for this NPI is Dentist, specializing in Endodontics, with taxonomy code 1223E0200X.

Is George Mastromihalis enrolled in Medicare?

No. George Mastromihalis has opted out of Medicare through December 28, 2027. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

What insurance does George Mastromihalis accept?

Health plans from BEST Life, Blue Cross and Blue Shield of Montana, Blue Cross and Blue Shield of Oklahoma, Blue Cross and Blue Shield of Texas and Florida Combined Life and 3 other insurers list George Mastromihalis 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 George Mastromihalis was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 44 days 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.