Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Heidi M Keesis, PA-C

Physician Assistant in Los Altos, CA · enumerated 2010 · practices at Sutter Bay Medical Foundation.

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

National Provider Identifier

1871809574

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Registry record

Entity type Individual (Type 1)

Name Heidi M Keesis

Credential PA-C

Sex Female

Practice address 715 Altos Oaks Dr, Los Altos, CA, 94024

Phone (650) 934-7020

Enumeration date Aug 19, 2010

Last updated in NPPES Jun 4, 2020

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 17824 (CA) Primary

Other identifiers

Identifier	Type	State	Issuer
PA17824	Other	CA	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.

Read the full guide → Validate an NPI →

Frequently asked questions

How do I verify Heidi Keesis's NPI record?

Cross-check NPI 1871809574 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1871809574 active?

Yes, as of the latest NPPES snapshot, NPI 1871809574 is active (record last updated 2020-06-04).

Other providers at this practice address

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John Nicholson Ambulatory Surgical Clinic/Center · Los Altos, CA NPI 1023176625 Sutter Bay Medical Foundation Ambulatory Surgical Clinic/Center · Los Altos, CA NPI 1568851327 Anne Deluca Nurse Practitioner · Los Altos, CA NPI 1982270542

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-06-04.