Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Sarah Lowenthal, M.D., A Professional Corporation

Family Medicine Physician in Mill Valley, CA · enumerated 2019 · authorized official Sarah Lowenthal, President and Owner.

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

National Provider Identifier

1619433216

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Registry record

Entity type Organization (Type 2)

Legal business name Sarah Lowenthal, M.D., A Professional Corporation

Practice address 655 Redwood Hwy Frontage Rd Ste 364, Mill Valley, CA, 94941

Phone (415) 569-4918

Enumeration date Feb 19, 2019

Last updated in NPPES Feb 19, 2019

Taxonomy & classification

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name Sarah Lowenthal

Title President and Owner

Phone (415) 971-7824

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.

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Frequently asked questions

What is the NPI number for Sarah Lowenthal, M.D., A Professional Corporation?

The NPI for Sarah Lowenthal, M.D., A Professional Corporation is 1619433216, a Type 2 (organization) record in the CMS NPPES registry.

Who is the authorized official for Sarah Lowenthal, M.D., A Professional Corporation?

NPPES lists Sarah Lowenthal (President and Owner) as the authorized official for this organization.

Providers at this address

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Sarah Lowenthal Family Medicine Physician · Mill Valley, CA NPI 1790813046

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-02-19.