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PERUMAL RAJA THIYAGARAJAN MD INTERNAL MEDICINE PLLC
NPI 1295694727
Internal Medicine in Melville, NY

Active since January 20, 2026
201 OLD COUNTRY RD STE 170, MELVILLE, NY 11747(631) 271-9151 Get Directions Write a Review

NPPES record last updated: May 6, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: May 6, 2026, Jan 20, 2026 (2 updates tracked since 2026).

About Perumal Raja Thiyagarajan Md Internal Medicine Pllc NPPES

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

PERUMAL RAJA THIYAGARAJAN MD INTERNAL MEDICINE PLLC (NPI 1295694727) is a healthcare organization registered as an internal medicine in Melville, New York and active in the NPI registry since January 2026. The organization lists Perumal Thiyagarajan, Owner, as its authorized official.

NPPES Registry Identity

NPI1295694727
Entity TypeOrganization
Primary Taxonomy207R00000X
Legal Business NamePERUMAL RAJA THIYAGARAJAN MD INTERNAL MEDICINE PLLC
Location Address201 OLD COUNTRY RD STE 170Melville, NY 11747-2732
Mailing Address201 Old Country Rd Ste 170Melville, NY 11747-2732
Phone(631) 271-9151
Organization SubpartNo
Authorized OfficialPerumal ThiyagarajanOwner · (516) 800-5012
Enumeration DateJanuary 20, 2026
Last NPPES UpdateMay 6, 20262 updates tracked since enumeration
NPPES CertifiedMay 6, 2026
✔ NPI 1295694727 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
201 OLD COUNTRY RD STE 170, Melville, NY 11747
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Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-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)

Perumal Raja Thiyagarajan Md Internal Medicine Pllc 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 Perumal Raja Thiyagarajan MD Internal Medicine PLLC, which bills Medicare for the services this clinician delivers.

Clinician (1)

Perumal Thiyagarajan, M.D.
Internal Medicine
NPI 1760811582
254 EASTON AVE
New Brunswick, NJ 08901
(732) 745-8600
✔ PECOS✔ Accepts Medicare59 mi

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 Perumal Raja Thiyagarajan MD Internal Medicine PLLC's NPI number?

The NPI number for Perumal Raja Thiyagarajan MD Internal Medicine PLLC is 1295694727. It was assigned to this organization in the NPPES registry on January 20, 2026.

Where is Perumal Raja Thiyagarajan MD Internal Medicine PLLC located?

Perumal Raja Thiyagarajan MD Internal Medicine PLLC is located at 201 Old Country Rd Ste 170, Melville, NY 11747. The listed phone number is (631) 271-9151.

What is Perumal Raja Thiyagarajan MD Internal Medicine PLLC's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Perumal Raja Thiyagarajan MD Internal Medicine PLLC enrolled in Medicare?

Yes. Perumal Raja Thiyagarajan MD Internal Medicine PLLC is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Perumal Raja Thiyagarajan MD Internal Medicine PLLC?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Internal Medicine) reassigns their Medicare billing to Perumal Raja Thiyagarajan MD Internal Medicine PLLC. 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 Perumal Raja Thiyagarajan MD Internal Medicine PLLC was last updated on May 6, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.