Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Hayward Sisters Hospital

Q: What is the NPI number for Hayward Sisters Hospital?

The NPI for Hayward Sisters Hospital is 1023225828, a Type 2 (organization) record in the CMS NPPES registry.

Pediatric Dentistry in Hayward, CA · enumerated 2007 · authorized official Michael Mahoney, President & Ceo.

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

National Provider Identifier

1023225828

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)

Legal business name Hayward Sisters Hospital

Other name <Unavail>

Practice address 680 W Tennyson Rd, Hayward, CA, 94544

Phone (510) 780-9119

Fax (510) 780-9211

Enumeration date May 17, 2007

Last updated in NPPES Aug 22, 2020

Taxonomy & classification

1223P0221X Pediatric Dentistry Dental Providers Primary

Authorized official

Name Michael Mahoney

Title President & Ceo

Phone (510) 264-4000

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 is the NPI number for Hayward Sisters Hospital?

The NPI for Hayward Sisters Hospital is 1023225828, a Type 2 (organization) record in the CMS NPPES registry.

Who is the authorized official for Hayward Sisters Hospital?

NPPES lists Michael Mahoney (President & Ceo) as the authorized official for this organization.

Providers at this address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-08-22.