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MKR MEDICAL PC
NPI 1417371774
Internal Medicine - Cardiovascular Disease in Brooklyn, NY

Active since February 06, 2014CLIA 33D2284253 · Waiver
828 UTICA AVE, BROOKLYN, NY 11203(718) 303-0851 Get Directions Write a Review

NPPES record last updated: February 12, 2026. Verified against the NPPES registry weekly; last sync: November 08, 2026.

Record update history: Nov 7, 2025, Mar 17, 2018, Jan 12, 2018 (3 updates tracked since 2018).

About Mkr Medical Pc NPPES

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

MKR MEDICAL PC (NPI 1417371774) is a healthcare organization registered as a cardiovascular disease in Brooklyn, New York and active in the NPI registry since February 2014. The organization holds a CLIA Waiver certificate valid through June 20, 2027, maintains a secondary practice location in Brooklyn, and lists Marc Rybstein, President, as its authorized official.

NPPES Registry Identity

NPI1417371774
Entity TypeOrganization
Primary Taxonomy207RC0000X
Legal Business NameMKR MEDICAL PC
Location Address828 UTICA AVEBrooklyn, NY 11203-3409
Mailing Address545 E Jericho TpkeHuntington Station, NY 11746-7325 · (718) 303-0851
Phone(718) 303-0851
Organization SubpartNo
Authorized OfficialMarc RybsteinPresident · (516) 307-9618
Enumeration DateFebruary 6, 2014
Last NPPES UpdateFebruary 12, 20263 updates tracked since enumeration
NPPES CertifiedFebruary 12, 2026
✔ NPI 1417371774 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Cardiovascular DiseaseAllopathic & Osteopathic Physicians
Taxonomy Code207RC0000X
License✔ Licensed in NY · 253288
Definition
An internist who specializes in diseases of the heart and blood vessels and manages complex cardiac conditions such as heart attacks and life-threatening, abnormal heartbeat rhythms.
Also ListedFamily MedicineTaxonomy 207Q00000X · License 253288 (NY)
828 UTICA AVE, Brooklyn, NY 11203
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Secondary Practice Location 1

Location 1447 FENIMORE STREETBROOKLYN, NY 11225 · Phone (718) 303-0851

Group Practice 2

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X MULTIPLE SINGLE SPECIALTY GROUP
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 and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Mkr Medical Pc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

2

Medicare enrollment records show 2 clinicians reassign Medicare billing to Mkr Medical PC, which bills Medicare for the services they deliver. Of these, 1 practice at this address. They are listed nearest first.

Clinicians, nearest first (2)

Marc Rybstein, M.D.
Cardiovascular Disease (Cardiology)
NPI 1538393822
828 UTICA AVE
Brooklyn, NY 11203
(718) 303-0851
✔ PECOS✔ Accepts MedicareSame address
Maria Villavieja, RN,FNP
Nurse Practitioner
NPI 1053462523
506 MALCOLM X BLVD NEW NURSES RESIDENCE RM 409
New York, NY 10037
(212) 939-4330
✔ PECOS✔ Accepts Medicare11 mi

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Waiver 33D2284253

Mkr Medical PC · Brooklyn, NY
Active · expires Jun 20, 2027
CLIA Number33D2284253
Laboratory TypePhysician Office
Certificate Effective DateJune 21, 2025
Certificate Expiration DateJune 20, 2027
Laboratory DirectorDr. Marc K. Rybstein
Laboratory Phone(718) 303-0851
Laboratory LocationMkr Medical PC447 Fenimore Street, Brooklyn, NY 11225
CLIA data matches this NPI record on: Address Name Phone
This certificate is issued to a laboratory to perform only waived tests.

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 Mkr Medical PC's NPI number?

The NPI number for Mkr Medical PC is 1417371774. It was assigned to this organization in the NPPES registry on February 6, 2014.

Where is Mkr Medical PC located?

Mkr Medical PC is located at 828 Utica Ave, Brooklyn, NY 11203. The listed phone number is (718) 303-0851.

What is Mkr Medical PC's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Cardiovascular Disease, with taxonomy code 207RC0000X.

Is Mkr Medical PC enrolled in Medicare?

Yes. Mkr Medical PC is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Mkr Medical PC?

According to the CMS Revalidation Reassignment List (October 2026 release), 2 clinicians reassign their Medicare billing to Mkr Medical PC, in Cardiovascular Disease (Cardiology) and Nurse Practitioner. A 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 the clinician's services. Of these, 1 practice at this address. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Does Mkr Medical PC hold a CLIA laboratory certificate?

Yes. A Certificate of Waiver (number 33D2284253) is associated with this NPI, valid through June 20, 2027. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

When was this NPI record last updated?

The NPPES record for Mkr Medical PC was last updated on February 12, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.