Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark Edward Nakano, OD

Optometrist in Torrance, CA · enumerated 2005.

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

National Provider Identifier

1821072133

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark Edward Nakano

Credential OD

Sex Male

Practice address 4201 Torrance Blvd., Suite 580, Torrance, CA, 90503

Phone (310) 316-6726

Fax (310) 316-6856

Enumeration date Nov 30, 2005

Last updated in NPPES Apr 29, 2011

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 8818TPL (CA) Primary

OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses. About the OD credential

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

Is NPI 1821072133 active?

Yes, as of the latest NPPES snapshot, NPI 1821072133 is active (record last updated 2011-04-29).

How do I verify Mark Nakano's NPI record?

Cross-check NPI 1821072133 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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William C. Kim, MD Inc Specialist · Torrance, CA NPI 1548265499 John Ducar Periodontics · Torrance, CA NPI 1720083397 Roy Blumenstrauch Specialist · Torrance, CA NPI 1639175409 William Kim Specialist · Torrance, CA NPI 1144228628 Anthony Leung Specialist · Torrance, CA NPI 1528066008 Henry Noguchi Ophthalmology Physician · Torrance, CA NPI 1770571382 Paul Sumida Optometrist · Torrance, CA NPI 1760468102 Ellyn Ashida Allergy & Immunology Physician · Torrance, CA NPI 1245201516

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-04-29.