Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Perumal Raja Thiyagarajan MD Internal Medicine Pllc

Internal Medicine Physician in Melville, NY · enumerated 2026 · authorized official Perumal Thiyagarajan, Owner.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1295694727

Verified

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Registry record

Entity type Organization (Type 2)

Legal business name Perumal Raja Thiyagarajan MD Internal Medicine Pllc

Practice address 201 Old Country Rd Ste 170, Melville, NY, 11747

Phone (631) 271-9151

Enumeration date Jan 20, 2026

Last updated in NPPES May 6, 2026

Taxonomy & classification

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name Perumal Thiyagarajan

Title Owner

Phone (516) 800-5012

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What type of organization is Perumal Raja Thiyagarajan MD Internal Medicine Pllc?

Perumal Raja Thiyagarajan MD Internal Medicine Pllc is registered in NPPES as a Internal Medicine Physician (its primary provider taxonomy).

What is a Type 2 NPI?

A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-05-06.