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MARK S. MCMAHON M.D. PC
NPI 1811260714
Specialist in New York, NY

Active since February 23, 2012
876 PARK AVE, NEW YORK, NY 10075(212) 717-1405(212) 396-3277 Get Directions Write a Review

NPPES record last updated: February 23, 2012. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Mark S. Mcmahon M.d. Pc NPPES

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

MARK S. MCMAHON M.D. PC (NPI 1811260714) is a healthcare organization registered as a specialist in New York, New York and active in the NPI registry since February 2012. The organization lists Michelle Carrero, Office Manager/medical Biller, as its authorized official.

NPPES Registry Identity

NPI1811260714
Entity TypeOrganization
Primary Taxonomy174400000X
Legal Business NameMARK S. MCMAHON M.D. PC
Location Address876 PARK AVENew York, NY 10075-1832
Mailing Address876 Park AveNew York, NY 10075-1832 · (212) 717-1405 · Fax (212) 396-3277
Phone(212) 717-1405
Fax(212) 396-3277
Organization SubpartNo
Authorized OfficialMichelle CarreroOffice Manager/medical Biller · (212) 717-1405
Enumeration DateFebruary 23, 2012
✔ NPI 1811260714 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySpecialistOther Service Providers
Taxonomy Code174400000X
Definition
An individual educated and trained in an applied knowledge discipline used in the performance of work at a level requiring knowledge and skills beyond or apart from that provided by a general education or liberal arts degree.
876 PARK AVE, New York, NY 10075
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Other Identifiers 1

Medicare UPINF49516NY

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, revalidation and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Mark S. Mcmahon M.d. Pc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Medicare Revalidation Due Date

Revalidation due by January 31, 2027

Medicare-enrolled providers and suppliers confirm their enrollment information with CMS on a set cycle, every 5 years for most and every 3 years for medical equipment suppliers. CMS sets the due date for each enrollment.

StateEnrollment IDDue date
StateNew YorkEnrollment IDO20120327000840Non-DME Part B · Clinic/Group PracticeDue dateJanuary 31, 2027
Source: CMS Revalidation Due Date List, October 2026 release.

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to Mark S. Mcmahon M.D. PC, which bills Medicare for the services this clinician delivers.

Clinician (1)

Mark Mcmahon, MD
Orthopedic Surgery
NPI 1750437521
876 PARK AVENUE
New York, NY 10021
(212) 717-1405
✔ PECOS✔ Accepts MedicareSame address

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

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 Mark S. Mcmahon M.D. PC's NPI number?

The NPI number for Mark S. Mcmahon M.D. PC is 1811260714. It was assigned to this organization in the NPPES registry on February 23, 2012.

Where is Mark S. Mcmahon M.D. PC located?

Mark S. Mcmahon M.D. PC is located at 876 Park Ave, New York, NY 10075. The listed phone number is (212) 717-1405.

What is Mark S. Mcmahon M.D. PC's specialty?

The primary specialty registered for this NPI is Specialist with taxonomy code 174400000X.

Is Mark S. Mcmahon M.D. PC enrolled in Medicare?

Yes. Mark S. Mcmahon M.D. PC is registered in the Medicare PECOS enrollment system.

When is Mark S. Mcmahon M.D. PC's Medicare revalidation due?

According to the CMS Revalidation Due Date List (October 2026 release), the Medicare Non-DME Part B enrollment for this organization (New York, Clinic/Group Practice) is due for revalidation by January 31, 2027. Medicare providers and suppliers revalidate their enrollment every 5 years, and medical equipment suppliers every 3 years. Confirm current requirements with your Medicare Administrative Contractor.

How many clinicians bill Medicare through Mark S. Mcmahon M.D. PC?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Orthopedic Surgery) reassigns their Medicare billing to Mark S. Mcmahon M.D. PC. 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. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Mark S. Mcmahon M.D. PC was last updated on February 23, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.