Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Cynthia Copperstein, PT, DPT

Physical Therapist in Walnut Creek, CA · enumerated 2017.

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

National Provider Identifier

1821534520

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Registry record

Entity type Individual (Type 1)

Name Cynthia Copperstein

Credential PT, DPT

Sex Female

Practice address 988 Leroy Ln, Walnut Creek, CA, 94597

Phone (925) 285-7553

Enumeration date Jan 18, 2017

Last updated in NPPES Jan 18, 2017

Taxonomy & licenses

225100000X Physical Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 34460 (CA) Primary

PT · Physical Therapist: A licensed movement specialist treating injury and disability through exercise and rehabilitation. About the PT credential

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

How do I verify Cynthia Copperstein's NPI record?

Cross-check NPI 1821534520 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1821534520 active?

Yes, as of the latest NPPES snapshot, NPI 1821534520 is active (record last updated 2017-01-18).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-01-18.