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RICHARD H. YOOK, M.D, INC.
NPI 1225225238
Ophthalmology in Northridge, CA

Active since October 03, 2007
18137 PARTHENIA ST # A, NORTHRIDGE, CA 91325(818) 993-5410(818) 993-8300 Get Directions Write a Review

NPPES record last updated: March 19, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Richard H. Yook, M.d, Inc. NPPES

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

RICHARD H. YOOK, M.D, INC. (NPI 1225225238) is a healthcare organization registered as an ophthalmology in Northridge, California and active in the NPI registry since October 2007. The organization lists Chee Hian Tan, Ceo, as its authorized official.

NPPES Registry Identity

NPI1225225238
Entity TypeOrganization
Primary Taxonomy207W00000X
Legal Business NameRICHARD H. YOOK, M.D, INC.
Location Address18137 PARTHENIA ST # ANorthridge, CA 91325-3301
Mailing Address18137 Parthenia St # ANorthridge, CA 91325-3301 · (818) 993-5410 · Fax (818) 993-8300
Phone(818) 993-5410
Fax(818) 993-8300
Organization SubpartNo
Authorized OfficialChee Hian TanCeo · (818) 993-5410
Enumeration DateOctober 3, 2007
Last NPPES UpdateMarch 19, 2025
NPPES CertifiedMarch 19, 2025
✔ NPI 1225225238 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOphthalmologyAllopathic & Osteopathic Physicians
Taxonomy Code207W00000X
License✔ Licensed in CA · G24712
Definition
An ophthalmologist has the knowledge and professional skills needed to provide comprehensive eye and vision care. Ophthalmologists are medically trained to diagnose, monitor and medically or surgically treat all ocular and visual disorders. This includes problems affecting the eye and its component structures, the eyelids, the orbit and the visual pathways. In so doing, an ophthalmologist prescribes vision services, including glasses and contact lenses.
18137 PARTHENIA ST # A, Northridge, CA 91325
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Other Identifiers 3

MedicaidG24712CA
OtherG24712CA · Medicare Id
Medicaid00G247120CA

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Richard H. Yook, M.d, Inc. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

2

Medicare enrollment records show 2 clinicians reassign Medicare billing to Richard H. Yook, M.D, Inc., which bills Medicare for the services they deliver. Of these, 1 practice within 10 miles. They are listed nearest first.

Clinicians, nearest first (2)

Richard Yook, M.D.
Ophthalmology
NPI 1003838392
8940 RESEDA BLVD SUITE 103
Northridge, CA 91324
(818) 993-5410
✔ PECOS✔ Accepts Medicare0.5 mi
Chee Hian Tan, M.D., PH.D.
Ophthalmology
NPI 1346263357
625 S FAIR OAKS AVE SUITE 285
Pasadena, CA 91105
(626) 817-4747
✔ PECOS✔ Accepts Medicare23 mi

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

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 Richard H. Yook, M.D, Inc.'s NPI number?

The NPI number for Richard H. Yook, M.D, Inc. is 1225225238. It was assigned to this organization in the NPPES registry on October 3, 2007.

Where is Richard H. Yook, M.D, Inc. located?

Richard H. Yook, M.D, Inc. is located at 18137 Parthenia St # A, Northridge, CA 91325. The listed phone number is (818) 993-5410.

What is Richard H. Yook, M.D, Inc.'s specialty?

The primary specialty registered for this NPI is Ophthalmology with taxonomy code 207W00000X.

Is Richard H. Yook, M.D, Inc. enrolled in Medicare?

Yes. Richard H. Yook, M.D, Inc. is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Richard H. Yook, M.D, Inc.?

According to the CMS Revalidation Reassignment List (October 2026 release), 2 clinicians, all in Ophthalmology, reassign their Medicare billing to Richard H. Yook, M.D, Inc.. A 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 the clinician's services. Of these, 1 practice within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Richard H. Yook, M.D, Inc. was last updated on March 19, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.