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JAY MAHADEVAN INC
NPI 1386747715
Internal Medicine in St Louis, MO

Active since September 07, 2006CLIA 26D0858458 · Waiver
3535 S JEFFERSON AVE, SUITE 304, ST LOUIS, MO 63118(314) 865-6585(314) 865-6599 Get Directions Write a Review

NPPES record last updated: August 5, 2010. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About Jay Mahadevan Inc NPPES

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

JAY MAHADEVAN INC (NPI 1386747715) is a healthcare organization registered as an internal medicine in St Louis, Missouri and active in the NPI registry since September 2006. The organization holds a CLIA Waiver certificate valid through August 31, 2028 and lists Jay Mahadevan, President, as its authorized official.

NPPES Registry Identity

NPI1386747715
Entity TypeOrganization
Primary Taxonomy207R00000X
Legal Business NameJAY MAHADEVAN INC
Location Address3535 S JEFFERSON AVE, SUITE 304St Louis, MO 63118
Mailing AddressPo Box 775578St Louis, MO 63177-5578 · (314) 865-6582 · Fax (314) 865-6599
Phone(314) 865-6585
Fax(314) 865-6599
Organization SubpartNo
Authorized OfficialJay MahadevanPresident · (314) 865-6582
Enumeration DateSeptember 7, 2006
Last NPPES UpdateAugust 5, 2010
✔ NPI 1386747715 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.
3535 S JEFFERSON AVE, St Louis, MO 63118
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Other Identifiers 5

Medicaid201582608MO
Other100656MO · Blue Shield
Other0400415MO · Uhc
Medicare UPINA23972
Medicare ID-Type Unspecified000001011MO

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Jay Mahadevan Inc 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 Jay Mahadevan Inc, which bills Medicare for the services this clinician delivers.

Clinician (1)

Jambunathan Mahadevan, MD
Internal Medicine
NPI 1669588638
3535 S JEFFERSON AVE SUITE 304
St Louis, MO 63118
(314) 865-6585
✔ 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.

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 26D0858458

Jay Mahadevan MD · Saint Louis, MO
Active · expires Aug 31, 2028
CLIA Number26D0858458
Laboratory TypePhysician Office
Certificate Effective DateSeptember 1, 2026
Certificate Expiration DateAugust 31, 2028
Laboratory DirectorJay Mahadevan
Laboratory Phone(314) 865-6585
Laboratory LocationJay Mahadevan MD11222 Tesson Ferry Rd, Suite 102, Saint Louis, MO 63123
CLIA data matches this NPI record on: 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 Jay Mahadevan Inc's NPI number?

The NPI number for Jay Mahadevan Inc is 1386747715. It was assigned to this organization in the NPPES registry on September 7, 2006.

Where is Jay Mahadevan Inc located?

Jay Mahadevan Inc is located at 3535 S Jefferson Ave Suite 304, St Louis, MO 63118. The listed phone number is (314) 865-6585.

What is Jay Mahadevan Inc's specialty?

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

Is Jay Mahadevan Inc enrolled in Medicare?

Yes. Jay Mahadevan Inc is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Jay Mahadevan Inc?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Internal Medicine) reassigns their Medicare billing to Jay Mahadevan Inc. 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.

Does Jay Mahadevan Inc hold a CLIA laboratory certificate?

Yes. A Certificate of Waiver (number 26D0858458) is associated with this NPI, valid through August 31, 2028. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

When was this NPI record last updated?

The NPPES record for Jay Mahadevan Inc was last updated on August 5, 2010. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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.