DR. JOHN ILSUN RYU O.D.
NPI 1609946847
Optometrist in Simi Valley, CA

Q: What is John Ryu's NPI number?

The NPI number for John Ryu is 1609946847. It was assigned to this individual provider in the NPPES registry on November 8, 2006.

Q: What is John Ryu'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 John Ryu was last updated on July 15, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years 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 November 08, 2006PECOS Enrolled

690 E LOS ANGELES AVE, SUITE A, SIMI VALLEY, CA 93065(626) 376-3513(905) 250-1001 Get Directions Write a Review

NPPES record last updated: July 15, 2024. Verified against the NPPES registry weekly; last sync: August 02, 2026.

On this page

About Dr. John Ilsun Ryu O.d. NPPES

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

DR. JOHN ILSUN RYU O.D. (NPI 1609946847) is an individual optometrist in Simi Valley, California, licensed in California (11209T) and active in the NPI registry since November 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1609946847

Entity TypeIndividualMale

Primary Taxonomy152W00000X

Provider Legal NameDR. JOHN ILSUN RYUCredential: O.D.

Location Address690 E LOS ANGELES AVE, SUITE ASimi Valley, CA 93065-1857

Mailing Address1194 Knottingham StSimi Valley, CA 93065-5167 · (626) 376-3513 · Fax (805) 250-1001

Phone(626) 376-3513

Fax(905) 250-1001

Sole ProprietorYes

Enumeration DateNovember 8, 2006

Last NPPES UpdateJuly 15, 2024

NPPES CertifiedJuly 15, 2024

✔ NPI 1609946847 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 · 11209T

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.

690 E LOS ANGELES AVE, Simi Valley, CA 93065

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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross and Blue Shield of Louisiana, Blue Cross and Blue Shield of Montana, Blue Cross and Blue Shield of Oklahoma and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. John Ilsun Ryu O.d. 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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 93065 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

$140.72 typical visit price

range $62.32 – $185.36

Typical copayment $35.18 (range $15.58 – $46.34)

Most-billed visit code 99204

Established Patient

$77.11 typical visit price

range $20.68 – $151.85

Typical copayment $19.27 (range $5.17 – $37.96)

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.

SUMMIT OPTOMETRIC EYECARE

Optometrist

690 E LOS ANGELES AVE, SUITE A
SIMI VALLEY, CA 93065

Ventura County (626) 376-3513

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 John Ryu's NPI number?

The NPI number for John Ryu is 1609946847. It was assigned to this individual provider in the NPPES registry on November 8, 2006.

Where is John Ryu located?

John Ryu practices at 690 E Los Angeles Ave Suite A, Simi Valley, CA 93065. The listed phone number is (626) 376-3513.

What is John Ryu's specialty?

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

Is John Ryu enrolled in Medicare?

Yes. John Ryu is registered in the Medicare PECOS enrollment system.

What insurance does John Ryu accept?

Health plans from Blue Cross and Blue Shield of Louisiana, Blue Cross and Blue Shield of Montana, Blue Cross and Blue Shield of Oklahoma, Blue Cross and Blue Shield of Texas and Providence Health Plan list John Ryu 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 John Ryu was last updated on July 15, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years 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.