Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Foremost Laboratories, LLC

Q: What is the NPI number for Foremost Laboratories, LLC?

The NPI for Foremost Laboratories, LLC is 1821486564, a Type 2 (organization) record in the CMS NPPES registry.

Clinical Medical Laboratory in Southfield, MI · enumerated 2015 · authorized official Dominic Siwik, Managing Member.

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

National Provider Identifier

1821486564

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Registry record

Entity type Organization (Type 2)

Legal business name Foremost Laboratories, LLC

Practice address 24555 Southfield Rd, Suite 130, Southfield, MI, 48075

Phone (248) 327-6160

Enumeration date Jan 5, 2015

Last updated in NPPES Aug 13, 2015

Taxonomy & classification

291U00000X Clinical Medical Laboratory Laboratories Primary

Authorized official

Name Dominic Siwik

Title Managing Member

Phone (313) 655-5400

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 is the NPI number for Foremost Laboratories, LLC?

The NPI for Foremost Laboratories, LLC is 1821486564, a Type 2 (organization) record in the CMS NPPES registry.

Who is the authorized official for Foremost Laboratories, LLC?

NPPES lists Dominic Siwik (Managing Member) as the authorized official for this organization.

Providers at this address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-08-13.