Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Nena Castro, CNM, RN

Midwife in San Leandro, CA · enumerated 2016.

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

National Provider Identifier

1649622671

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Registry record

Entity type Individual (Type 1)

Name Nena Castro

Credential CNM, RN

Sex Female

Practice address 2500 Merced St, San Leandro, CA, 94577

Phone (510) 454-1000

Enumeration date Jul 1, 2016

Last updated in NPPES Jan 3, 2022

Taxonomy & licenses

163W00000X Registered Nurse Nursing Service Providers · License 201507018RN (OR) Secondary

163W00000X Registered Nurse Nursing Service Providers · License 95131605 (CA) Secondary

176B00000X Midwife Other Service Providers · License 235899 (CA) Primary

CNM · Certified Nurse Midwife: An advanced practice nurse specializing in pregnancy, childbirth, and reproductive care. About the CNM 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

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.

What specialty is Nena Castro?

Nena Castro is registered in NPPES with the primary taxonomy of Midwife. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-01-03.