Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Cassandra Sierra

Speech-Language Assistant in Tracy, CA · enumerated 2017.

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

National Provider Identifier

1477079655

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Cassandra Sierra

Sex Female

Practice address 632 W 11th St Ste 119, Tracy, CA, 95376

Phone (925) 470-6948

Enumeration date Aug 18, 2017

Last updated in NPPES Sep 28, 2019

Taxonomy & licenses

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care Secondary

2355S0801X Speech-Language Assistant Speech, Language and Hearing Service Providers · License 3716 (CA) Primary

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 1477079655 active?

Yes, as of the latest NPPES snapshot, NPI 1477079655 is active (record last updated 2019-09-28).

How do I verify Cassandra Sierra's NPI record?

Cross-check NPI 1477079655 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-09-28.