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

Charles Drehsen, M.D.

Emergency Medicine Physician in Moorpark, CA · enumerated 2009 · practices at American Medical Response Ambulance Service Inc.

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

National Provider Identifier

1609008960

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Registry record

Entity type Individual (Type 1)

Name Charles Drehsen

Credential M.D.

Sex Male

Practice address Moorpark, CA, 93021

Phone (805) 517-2010

Enumeration date Aug 19, 2009

Last updated in NPPES Aug 19, 2009

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

Taxonomy & licenses

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License A30398 (CA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
00A303980	Medicaid	CA	-

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 Charles Drehsen?

The National Provider Identifier (NPI) for Charles Drehsen is 1609008960, a Type 1 (individual) record in the CMS NPPES registry.

Where does Charles Drehsen practice?

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

Other providers at this practice address

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American Medical Response Ambulance Service Inc Ambulance · Moorpark, CA NPI 1184732091

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-08-19.