Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ramanathan Madras Seshadri, M.D.

Surgical Oncology Physician in Danbury, CT · enumerated 2008.

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

National Provider Identifier

1891969937

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Registry record

Entity type Individual (Type 1)

Name Ramanathan Madras Seshadri

Credential M.D.

Sex Male

Practice address 24 Hospital Ave, Danbury, CT, 06810

Phone (203) 739-7000

Enumeration date Apr 18, 2008

Last updated in NPPES Oct 12, 2020

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 2013-00912 (NC) Secondary

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care Secondary

2086X0206X Surgical Oncology Physician Allopathic & Osteopathic Physicians · License 66791 (CT) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
1891969937	Medicaid	NC	-
NC1866	Medicaid	SC	-

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

Is NPI 1891969937 active?

Yes, as of the latest NPPES snapshot, NPI 1891969937 is active (record last updated 2020-10-12).

How do I verify Ramanathan Madras Seshadri's NPI record?

Cross-check NPI 1891969937 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-10-12.