Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Douglas Zweig, M.D.

Pulmonary Disease Physician in Saint Louis, MO · enumerated 2005.

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

National Provider Identifier

1043201205

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Registry record

Entity type Individual (Type 1)

Name Dr. William Douglas Zweig

Credential M.D.

Sex Male

Practice address 11133 Dunn Rd, Suite 2335, Saint Louis, MO, 63136

Phone (314) 653-5007

Fax (314) 653-4149

Enumeration date Nov 4, 2005

Last updated in NPPES Aug 4, 2008

Taxonomy & licenses

207RP1001X Pulmonary Disease Physician Allopathic & Osteopathic Physicians · License MOR7E74 (MO) 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
202130217	Medicaid	MO	-
CE7661	Other	MO	RR MEDICARE

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 1043201205 active?

Yes, as of the latest NPPES snapshot, NPI 1043201205 is active (record last updated 2008-08-04).

How do I verify William Zweig's NPI record?

Cross-check NPI 1043201205 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 2008-08-04.