Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Alvin Tan Od, Inc.

Q: What type of organization is Alvin Tan Od, Inc.?

Alvin Tan Od, Inc. is registered in NPPES as a Optometrist (its primary provider taxonomy).

Optometrist in Glendale, CA · enumerated 2020 · authorized official Alvin Tan, President.

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

National Provider Identifier

1619507514

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Registry record

Entity type Organization (Type 2)

Legal business name Alvin Tan Od, Inc.

Practice address 454 W Colorado St, Glendale, CA, 91204

Phone (818) 484-7905

Enumeration date Jan 20, 2020

Last updated in NPPES Jan 20, 2020

Taxonomy & classification

152W00000X Optometrist Eye and Vision Services Providers Primary

152WC0802X Corneal and Contact Management Optometrist Eye and Vision Services Providers Secondary

Authorized official

Name Alvin Tan

Title President

Phone (916) 205-8392

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 Alvin Tan Od, Inc.?

Alvin Tan Od, Inc. is registered in NPPES as a Optometrist (its primary provider taxonomy).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-01-20.