Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Silas Edwin Duncan, M.D.

Vascular Surgery Physician in Tyler, TX · enumerated 2005.

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

National Provider Identifier

1508868001

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Registry record

Entity type Individual (Type 1)

Name Dr. Silas Edwin Duncan

Credential M.D.

Sex Male

Practice address 700 Olympic Plaza Cir, Suite 510, Tyler, TX, 75701

Phone (903) 595-2636

Fax (903) 595-5560

Enumeration date Aug 15, 2005

Last updated in NPPES Jan 24, 2013

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License D4981 (TX) Secondary

2086S0129X Vascular Surgery Physician Allopathic & Osteopathic Physicians · License D4981 (TX) 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
MDD4981	Other	TX	TX WC/IHC
020028080	Other	TX	RAILROAD MEDICARE
2287588	Other	TX	BLUELINK
123940201	Medicaid	TX	-
4568289	Other	TX	AETNA
752605101	Other	TX	FEIN

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.

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Frequently asked questions

Is NPI 1508868001 active?

Yes, as of the latest NPPES snapshot, NPI 1508868001 is active (record last updated 2013-01-24).

How do I verify Silas Duncan's NPI record?

Cross-check NPI 1508868001 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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Robert Sutherland Pain Medicine (Anesthesiology) Physician · Tyler, TX NPI 1033112933 Paul Detwiler Neurological Surgery Physician · Tyler, TX NPI 1447253356 Thomas Grahm Neurological Surgery Physician · Tyler, TX NPI 1568465474 Mark Renfro Neurological Surgery Physician · Tyler, TX NPI 1003819913 Scott Lamb Pain Medicine (Physical Medicine & Rehabilitation) Physician · Tyler, TX NPI 1831192277 Yvonne Baum Internal Medicine Physician · Tyler, TX NPI 1679572614 Elias Fanous Gastroenterology Physician · Tyler, TX NPI 1760478689 Tyler Neurosurgical Associates, P.A. Neurological Surgery Physician · Tyler, TX NPI 1164419727

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-01-24.