MARY MATTHEOS PHYSICIAN P.C.
NPI 1245426550
Internal Medicine in Lindenhurst, NY
About Mary Mattheos Physician P.c. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARY MATTHEOS PHYSICIAN P.C. (NPI 1245426550) is a healthcare organization registered as an internal medicine in Lindenhurst, New York and active in the NPI registry since September 2007. The organization lists Mary Mattheos, Doctor, as its authorized official.
NPPES Registry Identity
Specialties & Licenses 3
Group Practice 1
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Mary Mattheos Physician P.c. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
Medicare enrollment records show 1 clinician reassigns Medicare billing to Mary Mattheos Physician P.C., which bills Medicare for the services this clinician delivers.
Clinician (1)
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 Mary Mattheos Physician P.C.'s NPI number?
The NPI number for Mary Mattheos Physician P.C. is 1245426550. It was assigned to this organization in the NPPES registry on September 20, 2007.
Where is Mary Mattheos Physician P.C. located?
Mary Mattheos Physician P.C. is located at 350 W Montauk Hwy, Lindenhurst, NY 11757. The listed phone number is (631) 226-0388.
What is Mary Mattheos Physician P.C.'s specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Mary Mattheos Physician P.C. enrolled in Medicare?
Yes. Mary Mattheos Physician P.C. is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Mary Mattheos Physician P.C.?
According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Internal Medicine) reassigns their Medicare billing to Mary Mattheos Physician P.C.. 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 Mary Mattheos Physician P.C. was last updated on July 14, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Mary Mattheos Physician P.c. · NPI 1245426550
Internal Medicine organization in Lindenhurst, New York. Organization record, active in the CMS NPPES registry since September 20, 2007.
## Identity
- **NPI:** 1245426550 (Entity type: Organization)
- **Enumerated:** September 20, 2007
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **Organization subpart:** No
- **Authorized official:** Mary Mattheos, DOCTOR
## Practice location
- **Address:** 350 W MONTAUK HWY, Lindenhurst, NY 11757-5630
- **Phone:** (631) 226-0388
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 1 clinician (Internal Medicine) reassigns Medicare billing to this organization (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** July 14, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1245426550) · Data from the CMS NPPES public registry.