Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Medical Diagnostic Laboratory Inc

Clinical Medical Laboratory in Mount Vernon, WA · enumerated 2006 · authorized official Kathy Pfeiffer, Bookkeeper.

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

National Provider Identifier

1386704310

Verified

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Registry record

Entity type Organization (Type 2)

Legal business name Medical Diagnostic Laboratory Inc

Practice address 409 Eleanor Lane, Building B, Mount Vernon, WA, 98273

Phone (360) 542-3232

Fax (360) 424-6326

Enumeration date Dec 11, 2006

Last updated in NPPES Aug 22, 2020

Taxonomy & classification

291U00000X Clinical Medical Laboratory Laboratories · License MTS-4979 (WA) Primary

Authorized official

Name Kathy Pfeiffer

Title Bookkeeper

Phone (360) 542-3232

Other identifiers

Identifier	Type	State	Issuer
MTS-4979	Other	WA	STATE LICENSE

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 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.

What type of organization is Medical Diagnostic Laboratory Inc?

Medical Diagnostic Laboratory Inc is registered in NPPES as a Clinical Medical Laboratory (its primary provider taxonomy).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-08-22.