Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

On Lok Senior Health Services

PACE Provider Organization in San Francisco, CA · enumerated 2005 · authorized official Grace Harper, Chief Executive Officer.

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

National Provider Identifier

1043218134

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Registry record

Entity type Organization (Type 2)

Legal business name On Lok Senior Health Services

Practice address 1333 Bush St, San Francisco, CA, 94109

Phone (415) 292-8888

Fax (415) 292-8745

Enumeration date Jul 12, 2005

Last updated in NPPES May 13, 2022

Taxonomy & classification

251T00000X PACE Provider Organization Agencies Primary

302R00000X Health Maintenance Organization Managed Care Organizations · License 9330385 (CA) Secondary

Authorized official

Name Grace Harper

Title Chief Executive Officer

Phone (415) 292-8883

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

Where is On Lok Senior Health Services located?

The practice location on file with NPPES is in San Francisco, CA.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2022-05-13. Verify at npiregistry.cms.hhs.gov.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-05-13.