Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Cynthia Chalk

Hospitalist Physician in San Francisco, CA · enumerated 2021.

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

National Provider Identifier

1124606900

Verified

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Registry record

Entity type Individual (Type 1)

Name Cynthia Chalk

Sex Female

Practice address San Francisco, CA, 94115

Phone (415) 833-2000

Enumeration date Mar 31, 2021

Last updated in NPPES Jan 30, 2025

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care Secondary

208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License A193871 (CA) Primary

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 Cynthia Chalk?

The National Provider Identifier (NPI) for Cynthia Chalk is 1124606900, a Type 1 (individual) record in the CMS NPPES registry.

Where does Cynthia Chalk practice?

The practice location on file with NPPES is in San Francisco, CA. Providers can have multiple locations; NPPES lists the primary practice address.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-01-30.