SIDE BY SIDE
NPI 1174775639
Community/Behavioral Health in Hayward, CA

Q: What is Side By Side's NPI number?

The NPI number for Side By Side is 1174775639. It was assigned to this organization in the NPPES registry on October 15, 2008. The provider was formerly known as Sunny Hills Services.

Q: What is Side By Side's specialty?

The primary specialty registered for this NPI is Community/Behavioral Health with taxonomy code 251S00000X.

Q: When was this NPI record last updated?

The NPPES record for Side By Side was last updated on July 21, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since October 15, 2008

22245 MAIN ST, SUITES 102, 200-215, HAYWARD, CA 94541(510) 727-9401(510) 727-9405 Get Directions Write a Review

NPPES record last updated: July 21, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jul 21, 2026, Jul 11, 2024, Apr 29, 2024 and 6 more (9 updates tracked since 2020).

On this page

About Side By Side NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

SIDE BY SIDE (NPI 1174775639) is a healthcare organization registered as a community/behavioral health in Hayward, California and active in the NPI registry since October 2008. The organization lists Christine Garcia, Chief Executive Officer, as its authorized official.

NPPES Registry Identity

NPI1174775639

Entity TypeOrganization

Primary Taxonomy251S00000X

Legal Business NameSIDE BY SIDE

Location Address22245 MAIN ST, SUITES 102, 200-215Hayward, CA 94541-4028

Mailing Address300 Sunnyhills DrSan Anselmo, CA 94960-1909 · (415) 457-3200 · Fax (415) 456-4679

Phone(510) 727-9401

Fax(510) 727-9405

Organization SubpartYes

Authorized OfficialChristine GarciaChief Executive Officer · (415) 457-3200

Enumeration DateOctober 15, 2008

Last NPPES UpdateJuly 21, 20269 updates tracked since enumeration

NPPES CertifiedJuly 21, 2026

✔ NPI 1174775639 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyCommunity/Behavioral HealthAgencies

Taxonomy Code251S00000X

Definition

A private or public agency usually under local government jurisdiction, responsible for assuring the delivery of community based mental health, intellectual disabilities, substance abuse and/or behavioral health services to individuals with those disabilities. Services may range from companion care, respite, transportation, community integration, crisis intervention and stabilization, supported employment, day support, prevocational services, residential support, therapeutic and supportive consultation, environmental modifications, intensive in-home therapy and day treatment, in addition to traditional mental health and behavioral treatment.

22245 MAIN ST, Hayward, CA 94541

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Other Names 2

Doing Business AsSide By Side

Former Legal Business NameSunny Hills Services

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Side By Side is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to Side By Side, which bills Medicare for the services this clinician delivers.

Clinician (1)

Rebecca Hathorn, LCSW

Clinical Social Worker

NPI 1770624363

22245 MAIN ST SUITE 200
Hayward, CA 94541

(510) 727-9401

✔ PECOSSame address

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Side By Side's NPI number?

The NPI number for Side By Side is 1174775639. It was assigned to this organization in the NPPES registry on October 15, 2008. The provider was formerly known as Sunny Hills Services.

Where is Side By Side located?

Side By Side is located at 22245 Main St Suites 102, 200-215, Hayward, CA 94541. The listed phone number is (510) 727-9401.

What is Side By Side's specialty?

The primary specialty registered for this NPI is Community/Behavioral Health with taxonomy code 251S00000X.

Is Side By Side enrolled in Medicare?

Yes. Side By Side is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Side By Side?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Clinical Social Worker) reassigns their Medicare billing to Side By Side. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Side By Side was last updated on July 21, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.