Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Independent Anesthesiology, A Medical Group

Specialist in Santa Ana, CA · enumerated 2007 · authorized official Colleen Williams, Agent.

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

National Provider Identifier

1841334364

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Registry record

Entity type Organization (Type 2)

Legal business name Independent Anesthesiology, A Medical Group

Other name <Unavail>

Practice address 1001 N Tustin Ave, Santa Ana, CA, 92705

Phone (714) 835-3555

Fax (714) 953-3542

Enumeration date Feb 17, 2007

Last updated in NPPES Aug 22, 2020

Taxonomy & classification

174400000X Specialist Other Service Providers Primary

Authorized official

Name Colleen Williams

Title Agent

Phone (714) 992-4444

Other identifiers

Identifier	Type	State	Issuer
ZZZ47026Z	Other	CA	BLUE SHIELD
GR0066370	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 a Type 2 NPI?

A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.

What type of organization is Independent Anesthesiology, A Medical Group?

Independent Anesthesiology, A Medical Group is registered in NPPES as a Specialist (its primary provider taxonomy).

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