Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Redwood Radiology Imaging Medical Clinic

Q: What is the NPI number for Redwood Radiology Imaging Medical Clinic?

The NPI for Redwood Radiology Imaging Medical Clinic is 1598867426, a Type 2 (organization) record in the CMS NPPES registry.

Diagnostic Radiology Physician in Fortuna, CA · enumerated 2006 · authorized official Stephen Viltrakis, Vice President.

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

National Provider Identifier

1598867426

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Registry record

Entity type Organization (Type 2)

Legal business name Redwood Radiology Imaging Medical Clinic

Practice address 3300 Renner Dr, Fortuna, CA, 95540

Phone (707) 725-3361

Enumeration date Sep 1, 2006

Last updated in NPPES Aug 22, 2020

Taxonomy & classification

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License G72357 (CA) Primary

Authorized official

Name Stephen Viltrakis

Title Vice President

Phone (707) 768-1988

Other identifiers

Identifier	Type	State	Issuer
GR0079730	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 Redwood Radiology Imaging Medical Clinic?

The NPI for Redwood Radiology Imaging Medical Clinic is 1598867426, a Type 2 (organization) record in the CMS NPPES registry.

Who is the authorized official for Redwood Radiology Imaging Medical Clinic?

NPPES lists Stephen Viltrakis (Vice President) as the authorized official for this organization.

Providers at this address

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Neal Feuerman Anesthesiology Physician · Fortuna, CA NPI 1922090919 St. Joseph Health Northern California, LLC Critical Access Hospital · Fortuna, CA NPI 1043292303 Glenn Siegfried Emergency Medicine Physician · Fortuna, CA NPI 1699737304 North Coast Emergency Physicians Emergency Medicine Physician · Fortuna, CA NPI 1992755193 William French Diagnostic Radiology Physician · Fortuna, CA NPI 1003857129 Francis Cutruzzola Diagnostic Radiology Physician · Fortuna, CA NPI 1740222645 Stephanie Demara Anesthesiology Physician · Fortuna, CA NPI 1003841735 Cassandra Kennedy Surgery Physician · Fortuna, CA NPI 1275550840

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-08-22.