Cassandra Sierra
Cassandra Sierra is a Speech-Language Assistant provider (Specialist/Technologist) practicing in Tracy, CA, registered in the NPPES registry with NPI 1477079655 since 2017.
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1477079655 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Cassandra Sierra |
| Sex | Female |
| Practice address | 632 W 11TH ST STE 119, Tracy, CA, 95376 |
| Phone | 9254706948 |
| Enumeration date | 2017-08-18 |
| Last updated in NPPES | 2019-09-28 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 390200000X | Student in an Organized Health Care Education/Training Program | Secondary | — | — |
| 2355S0801X | Speech-Language Assistant | Primary | 3716 | CA |
Copy-ready billing details
Provider: Cassandra Sierra NPI: 1477079655 Taxonomy: 2355S0801X (Speech-Language Assistant) Address: 632 W 11TH ST STE 119, Tracy, CA, 95376
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1457838948 | Amanique Birk | Individual | Speech-Language Assistant | Tracy, CA |
| 1356994636 | Cinthya Chavez | Individual | Speech-Language Pathologist | Tracy, CA |
| 1992351902 | Briana Holland | Individual | Occupational Therapist | Tracy, CA |
| 1881241420 | Emily Ann Becker | Individual | Occupational Therapist | Tracy, CA |
| 1407493869 | Sowmya Kadaveru | Individual | Speech-Language Pathologist | Tracy, CA |
| 1154953792 | Yesenia Lamas | Individual | Speech-Language Pathologist | Tracy, CA |
| 1588276919 | Diana Diaz Mora | Individual | Speech-Language Assistant | Tracy, CA |
| 1386238756 | Danielle. Desjardins | Individual | Occupational Therapist | Tracy, CA |
Verify this record
Cross-check NPI 1477079655 against the authoritative CMS record: view Cassandra Sierra on the official NPPES registry .
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 or validate an NPI number.
Frequently asked questions
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Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2019-09-28.