MICHAEL ANTONCHAK MD
NPI 1154986552
Pediatrics - Pediatric Cardiology in New York, NY
About Michael Antonchak Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MICHAEL ANTONCHAK MD (NPI 1154986552) is an individual pediatric cardiology provider in New York, New York, licensed in New York (315709) and active in the NPI registry since May 2019. He is enrolled in Medicare PECOS and is a graduate of Other (2019).
NPPES Registry Identity
Specialties & Licenses 2
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
Michael Antonchak 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 Michael Antonchak reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
New York, NY 10016
- Reassigned Medicare billing, New York enrollment
- 616 clinicians in this Medicare group
Boynton Beach, FL 33426
- Reassigned Medicare billing, New York enrollment
- 7,712 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.
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.
NEW YORK, NY 10016
NEW YORK, NY 10016
NEW YORK, NY 10016
NEW YORK, NY 10016
NEW YORK, NY 10016
NEW YORK, NY 10016
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 Michael Antonchak's NPI number?
The NPI number for Michael Antonchak is 1154986552. It was assigned to this individual provider in the NPPES registry on May 1, 2019.
Where is Michael Antonchak located?
Michael Antonchak practices at 550 1st Ave, New York, NY 10016. The listed phone number is (212) 263-5506.
What is Michael Antonchak's specialty?
The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Cardiology, with taxonomy code 2080P0202X.
Is Michael Antonchak enrolled in Medicare?
Yes. Michael Antonchak 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 Michael Antonchak's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Michael Antonchak reassigns Medicare benefits to 2 organizations: Nyu Langone Hospitals (New York, NY) and New York University (Boynton Beach, FL). 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 Michael Antonchak'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 Michael Antonchak was last updated on August 14, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.
# Michael Antonchak, MD · NPI 1154986552
Pediatric Cardiology physician in New York, New York. Individual provider, active in the CMS NPPES registry since May 1, 2019.
## Identity
- **NPI:** 1154986552 (Entity type: Individual)
- **Enumerated:** May 1, 2019
- **Primary specialty:** Pediatrics - Pediatric Cardiology · taxonomy 2080P0202X
- **State license:** 315709 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 550 1ST AVE, New York, NY 10016-6402
- **Phone:** (212) 263-5506
## 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): Nyu Langone Hospitals (NPI 1790975944, New York, NY); New York University (NPI 1285826438, Boynton Beach, FL) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2019
## Record status
- **NPPES last updated:** August 14, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1154986552) · Data from the CMS NPPES public registry.