SHEK ON GUN OD
NPI 1396388906
Optometrist in Tustin, CA

Q: What is Shek On Gun's NPI number?

The NPI number for Shek On Gun is 1396388906. It was assigned to this individual provider in the NPPES registry on October 26, 2019.

Q: What is Shek On Gun's specialty?

The primary specialty registered for this NPI is Optometrist with taxonomy code 152W00000X.

Q: When was this NPI record last updated?

The NPPES record for Shek On Gun was last updated on November 7, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since October 26, 2019PECOS Enrolled

528 E 1ST ST STE B, TUSTIN, CA 92780(657) 757-2020(657) 478-7761 Get Directions Write a Review

NPPES record last updated: November 7, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Nov 7, 2025, Apr 23, 2020, Oct 26, 2019 (3 updates tracked since 2019).

On this page

About Shek On Gun Od NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

SHEK ON GUN OD (NPI 1396388906) is an individual optometrist in Tustin, California, licensed in California (34445TLG) and active in the NPI registry since October 2019. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1396388906

Entity TypeIndividualMale

Primary Taxonomy152W00000X

Provider Legal NameSHEK ON GUNCredential: OD

Location Address528 E 1ST ST STE BTustin, CA 92780-3346

Mailing Address528 E 1st St Ste BTustin, CA 92780-3346 · (657) 757-2020 · Fax (657) 478-7761

Phone(657) 757-2020

Fax(657) 478-7761

Sole ProprietorNo

Enumeration DateOctober 26, 2019

Last NPPES UpdateNovember 7, 20253 updates tracked since enumeration

NPPES CertifiedNovember 7, 2025

✔ NPI 1396388906 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOptometristEye and Vision Services Providers

Taxonomy Code152W00000X

License✔ Licensed in CA · 34445TLG

Definition

Doctors of optometry (ODs) are the primary health care professionals for the eye. Optometrists examine, diagnose, treat, and manage diseases, injuries, and disorders of the visual system, the eye, and associated structures as well as identify related systemic conditions affecting the eye. An optometrist has completed pre-professional undergraduate education in a college or university and four years of professional education at a college of optometry, leading to the doctor of optometry (O.D.) degree. Some optometrists complete an optional residency in a specific area of practice. Optometrists are eye health care professionals state-licensed to diagnose and treat diseases and disorders of the eye and visual system.

528 E 1ST ST STE B, Tustin, CA 92780

Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield, Providence Health Plan.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Shek On Gun Od is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency– Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Shek On Gun reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Shek On Gun Od Inc

0.7 mi

Clinic/Center

528 E 1ST ST STE B
Tustin, CA 92780

Reassigned Medicare billing, California enrollment

NPI 1568208189 (657) 757-2020

Pamela I. Wu O.D. Inc.

5.2 mi

Optometrist

5414 WALNUT AVE STE B
Irvine, CA 92604

Reassigned Medicare billing, California enrollment
Medicare enrollment name: Pamela I Wu Od Inc
4 clinicians in this Medicare group

NPI 1235207127 (949) 262-9393

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 92780 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$142.39 typical visit price

range $62.96 – $187.60

Typical copayment $35.59 (range $15.74 – $46.90)

Most-billed visit code 99204

Established Patient

$77.96 typical visit price

range $20.84 – $153.61

Typical copayment $19.49 (range $5.21 – $38.40)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

SHEK ON GUN OD INC

Clinic/Center

528 E 1ST ST STE B
TUSTIN, CA 92780

Orange County (657) 757-2020

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Shek On Gun's NPI number?

The NPI number for Shek On Gun is 1396388906. It was assigned to this individual provider in the NPPES registry on October 26, 2019.

Where is Shek On Gun located?

Shek On Gun practices at 528 E 1st St Ste B, Tustin, CA 92780. The listed phone number is (657) 757-2020.

What is Shek On Gun's specialty?

The primary specialty registered for this NPI is Optometrist with taxonomy code 152W00000X.

Is Shek On Gun enrolled in Medicare?

Yes. Shek On Gun is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Shek On Gun's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Shek On Gun reassigns Medicare benefits to 2 organizations: Shek On Gun Od Inc (Tustin, CA) and Pamela I. Wu O.D. Inc. (Irvine, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Shek On Gun's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Shek On Gun accept?

Health plans from Anthem Blue Cross and Blue Shield and Providence Health Plan list Shek On Gun as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Shek On Gun was last updated on November 7, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.