Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

William G Lang MD A Professional Corporation

Internal Medicine Physician in Marina Del Rey, CA · enumerated 2006 · authorized official William Lang, President.

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

National Provider Identifier

1578643847

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Registry record

Entity type Organization (Type 2)

Legal business name William G Lang MD A Professional Corporation

Practice address 4644 Lincoln Blvd., Suite 111, Marina Del Rey, CA, 90292

Phone (310) 536-8200

Fax (310) 536-8240

Enumeration date Oct 17, 2006

Last updated in NPPES Oct 8, 2013

Taxonomy & classification

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name William Lang

Title President

Phone (310) 536-8200

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

What type of organization is William G Lang MD A Professional Corporation?

William G Lang MD A Professional Corporation is registered in NPPES as a Internal Medicine Physician (its primary provider taxonomy).

What is a Type 2 NPI?

A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-10-08.