Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Four Rivers Anesthesia PC

Certified Registered Nurse Anesthetist in Ontario, OR · enumerated 2007 · authorized official Michael Ohara, Owner.

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

National Provider Identifier

1801097407

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Registry record

Entity type Organization (Type 2)

Legal business name Four Rivers Anesthesia PC

Practice address 351 Sw 9th St, Ontario, OR, 97914

Phone (541) 889-5331

Enumeration date May 30, 2007

Last updated in NPPES Nov 1, 2010

Taxonomy & classification

367500000X Certified Registered Nurse Anesthetist Physician Assistants & Advanced Practice Nursing Providers · License 096007764CRNA (OR) Primary

Authorized official

Name Michael Ohara

Title Owner

Phone (208) 642-9293

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

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2010-11-01. Verify at npiregistry.cms.hhs.gov.

Where is Four Rivers Anesthesia PC located?

The practice location on file with NPPES is in Ontario, OR.

Providers at this address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-11-01.