Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Douglas Warren Marshall, M.D.

Neurology Physician in San Antonio, TX · enumerated 2006.

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

National Provider Identifier

1437191574

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Registry record

Entity type Individual (Type 1)

Name Dr. Douglas Warren Marshall

Credential M.D.

Sex Male

Practice address 400 Concord Plaza Dr, 300, San Antonio, TX, 78216

Phone (210) 804-5480

Fax (210) 804-5419

Enumeration date Jun 12, 2006

Last updated in NPPES Oct 23, 2007

Taxonomy & licenses

2084N0400X Neurology Physician Allopathic & Osteopathic Physicians · License G6209 (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
1425172	Other	TX	CIGNA
8H3630	Other	TX	BCBS
P00067872	Other	TX	RAILROAD MEDICARE
4116848	Other	TX	AETNA

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

How do I verify Douglas Marshall's NPI record?

Cross-check NPI 1437191574 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1437191574 active?

Yes, as of the latest NPPES snapshot, NPI 1437191574 is active (record last updated 2007-10-23).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-10-23.