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Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Sylvia Gladstone Castro, ARNP

Family Nurse Practitioner in Renton, WA · enumerated 2011.

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

National Provider Identifier

1912297219

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Registry record

Entity type Individual (Type 1)
Name Sylvia Gladstone Castro
Credential ARNP
Sex Female
Practice address Renton, WA, 98057
Phone (206) 823-1004
Fax (206) 309-3319
Enumeration date Apr 8, 2011
Last updated in NPPES Feb 15, 2023

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License AP60210183 (WA) Primary

Other identifiers

Identifier Type State Issuer
203390 Medicaid WA -
2143055 Medicaid WA -
AP60210183 Other WA MEDICAL LICENSE
RN00071163 Other WA MEDICAL LICENSE

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.

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Frequently asked questions

Where does Sylvia Castro practice?
The practice location on file with NPPES is in Renton, WA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Sylvia Castro?
The National Provider Identifier (NPI) for Sylvia Castro is 1912297219, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-02-15.