Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Gretchen Armstrong, MSPT

Physical Therapist in Montclair, NJ · enumerated 2006.

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

National Provider Identifier

1629159504

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Registry record

Entity type Individual (Type 1)

Name Gretchen Armstrong

Credential MSPT

Sex Female

Practice address 1 Greenwood Ave, Montclair, NJ, 07042

Phone (973) 746-2424

Fax (973) 746-5030

Enumeration date Oct 18, 2006

Last updated in NPPES Sep 19, 2007

Taxonomy & licenses

225100000X Physical Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 40QA01002600 (NJ) Primary

Other identifiers

Identifier	Type	State	Issuer
087328RGN	Other	NJ	MEDICARE ID

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 Gretchen Armstrong?

The National Provider Identifier (NPI) for Gretchen Armstrong is 1629159504, a Type 1 (individual) record in the CMS NPPES registry.

Where does Gretchen Armstrong practice?

The practice location on file with NPPES is in Montclair, NJ. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-09-19.