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DR. GUY KAZUO KATO O.D.
NPI 1598849820
Optometrist in Whittier, CA

Active since October 24, 2006PECOS Enrolled
6309 GREENLEAF AVE, WHITTIER, CA 90601(562) 698-3279(562) 698-8180 Get Directions Write a Review

NPPES record last updated: October 28, 2008. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Dr. Guy Kazuo Kato O.d. NPPES

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

DR. GUY KAZUO KATO O.D. (NPI 1598849820) is an individual optometrist in Whittier, California, licensed in California (8257T) and active in the NPI registry since October 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1598849820
Entity TypeIndividualMale
Primary Taxonomy152W00000X
Provider Legal NameDR. GUY KAZUO KATOCredential: O.D.
Location Address6309 GREENLEAF AVEWhittier, CA 90601-3536
Mailing Address6309 Greenleaf AveWhittier, CA 90601-3536 · (562) 698-3279 · Fax (562) 698-8180
Phone(562) 698-3279
Fax(562) 698-8180
Sole ProprietorYes
Enumeration DateOctober 24, 2006
Last NPPES UpdateOctober 28, 2008
✔ NPI 1598849820 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 · 8257T
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.
6309 GREENLEAF AVE, Whittier, CA 90601
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Other Identifiers 4

Medicare ID-Type UnspecifiedOP8257CA
MedicaidSD0082570CA
Medicare NSC4138200001CA
Medicare UPINT70261CA

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Guy Kazuo Kato 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.

Medicare Billing Reassignment

Medicare enrollment records show Guy Kato reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Catherine Cizmar, O.D., Inc.
Same address
Optometrist
6309 GREENLEAF AVE
Whittier, CA 90601
  • Reassigned Medicare billing, California enrollment
  • Medicare enrollment name: Catherine Cizmar Od Inc
  • 2 clinicians in this Medicare group
NPI 1992392658 (562) 698-3279

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 90601 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 4

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

DR. JOY T NAKABAYASHI O.D.
Optometrist
6309 GREENLEAF AVE
WHITTIER, CA 90601
Los Angeles County (562) 698-9907
GUY K KATO OD
Optometrist
6309 GREENLEAF AVE
WHITTIER, CA 90601
Los Angeles County (562) 698-3279
DR. CATHERINE CIZMAR OD
Optometrist
6309 GREENLEAF AVE
WHITTIER, CA 90601
Los Angeles County (562) 698-3279
CATHERINE CIZMAR, O.D., INC.
Optometrist
6309 GREENLEAF AVE
WHITTIER, CA 90601
Los Angeles County (562) 698-3279

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 Guy Kato's NPI number?

The NPI number for Guy Kato is 1598849820. It was assigned to this individual provider in the NPPES registry on October 24, 2006.

Where is Guy Kato located?

Guy Kato practices at 6309 Greenleaf Ave, Whittier, CA 90601. The listed phone number is (562) 698-3279.

What is Guy Kato's specialty?

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

Is Guy Kato enrolled in Medicare?

Yes. Guy Kato is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Guy Kato's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Guy Kato reassigns Medicare benefits to Catherine Cizmar, O.D., Inc. (Whittier, CA). The 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 Guy Kato's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Guy Kato was last updated on October 28, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 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.