Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Michael John Mash, MD LLC

Internal Medicine Physician in Norristown, PA · enumerated 2006.

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

National Provider Identifier

1669562583

Verified

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Registry record

Entity type Individual (Type 1)

Name Dr. Michael John Mash

Credential MD LLC

Sex Male

Practice address 1639 Dekalb St, Norristown, PA, 19401

Phone (610) 272-2272

Fax (610) 279-6286

Enumeration date Oct 13, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License MD027851E (PA) Primary

Other identifiers

Identifier	Type	State	Issuer
0045906000	Other	-	BCBS
0045906000	Other	-	EMPLOYER ID#
0921387	Medicaid	PA	-

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 1669562583 active?

Yes, as of the latest NPPES snapshot, NPI 1669562583 is active (record last updated 2007-07-08).

How do I verify Michael Mash's NPI record?

Cross-check NPI 1669562583 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.