Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Joshua H Rassen MD Inc

Internal Medicine Physician in Sonoma, CA · enumerated 2019 · authorized official Joshua Rassen, President.

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

National Provider Identifier

1619512548

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Registry record

Entity type Organization (Type 2)

Legal business name Joshua H Rassen MD Inc

Practice address 181 Andrieux St Ste 202, Sonoma, CA, 95476

Phone (707) 933-0500

Enumeration date Nov 14, 2019

Last updated in NPPES Nov 14, 2019

Taxonomy & classification

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name Joshua Rassen

Title President

Phone (707) 935-3759

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

Where is Joshua H Rassen MD Inc located?

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

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2019-11-14. Verify at npiregistry.cms.hhs.gov.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-11-14.