Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Heidi Stein, LCSW

Social Worker in Sunnyvale, CA · enumerated 2018.

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

National Provider Identifier

1891202248

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Heidi Stein

Credential LCSW

Sex Female

Practice address 301 Old San Francisco Rd, Sunnyvale, CA, 94086

Phone (408) 730-2864

Enumeration date Jan 8, 2018

Last updated in NPPES Jan 8, 2018

Taxonomy & licenses

104100000X Social Worker Behavioral Health & Social Service Providers · License 76465 (CA) Primary

LCSW · Licensed Clinical Social Worker: A social worker licensed for clinical practice including mental-health therapy. About the LCSW 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

What specialty is Heidi Stein?

Heidi Stein is registered in NPPES with the primary taxonomy of Social Worker. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Other providers at this practice address

Browse all →

Sharon Dutton Radiation Oncology Physician · Sunnyvale, CA NPI 1871591743 Kelly Chen Genetic Counselor (M.S.) · Sunnyvale, CA NPI 1124019153 Julianne O'Malley Pediatrics Physician · Sunnyvale, CA NPI 1144263542 Burton Weaver Family Medicine Physician · Sunnyvale, CA NPI 1588609390 Betsy Strong Family Medicine Physician · Sunnyvale, CA NPI 1679581920 Holland St. John Internal Medicine Physician · Sunnyvale, CA NPI 1609884931 Ira Chan Obstetrics & Gynecology Physician · Sunnyvale, CA NPI 1972618866 Wayneab Truneh Obstetrics & Gynecology Physician · Sunnyvale, CA NPI 1447367792

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-01-08.