Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark Sukjoon Choi

Optometrist in Torrance, CA · enumerated 2018.

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

National Provider Identifier

1770064610

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Registry record

Entity type Individual (Type 1)

Name Mark Sukjoon Choi

Sex Male

Practice address 2640 Lomita Blvd, Torrance, CA, 90505

Phone (310) 539-7100

Enumeration date Aug 28, 2018

Last updated in NPPES May 18, 2021

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License OPT33475 (CA) Primary

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 do I verify Mark Choi's NPI record?

Cross-check NPI 1770064610 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1770064610 active?

Yes, as of the latest NPPES snapshot, NPI 1770064610 is active (record last updated 2021-05-18).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-05-18.