1. Home
  2. Directory
  3. California
  4. Tustin
  5. Otolaryngology
  6. NPI Profile

CHARLES K. OH, MD INC.
NPI 1437110327
Otolaryngology in Tustin, CA

Active since March 30, 2006
2552 WALNUT AVENUE, 130, TUSTIN, CA 92780(714) 508-1600(714) 665-8304 Get Directions Write a Review

NPPES record last updated: November 6, 2012. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Charles K. Oh, Md Inc. NPPES

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

CHARLES K. OH, MD INC. (NPI 1437110327) is a healthcare organization registered as an otolaryngology in Tustin, California and active in the NPI registry since March 2006. The organization lists Charles Kyumin Oh, Provider, as its authorized official.

NPPES Registry Identity

NPI1437110327
Entity TypeOrganization
Primary Taxonomy207Y00000X
Legal Business NameCHARLES K. OH, MD INC.
Location Address2552 WALNUT AVENUE, 130Tustin, CA 92780
Mailing Address2552 Walnut Avenue, 130Tustin, CA 92780 · (714) 508-1600 · Fax (714) 665-8304
Phone(714) 508-1600
Fax(714) 665-8304
Organization SubpartNo
Authorized OfficialCharles Kyumin OhProvider · (714) 508-1600
Enumeration DateMarch 30, 2006
Last NPPES UpdateNovember 6, 2012
✔ NPI 1437110327 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOtolaryngologyAllopathic & Osteopathic Physicians
Taxonomy Code207Y00000X
License✔ Licensed in CA · A83003
Definition
An otolaryngologist-head and neck surgeon provides comprehensive medical and surgical care for patients with diseases and disorders that affect the ears, nose, throat, the respiratory and upper alimentary systems and related structures of the head and neck. An otolaryngologist diagnoses and provides medical and/or surgical therapy or prevention of diseases, allergies, neoplasms, deformities, disorders and/or injuries of the ears, nose, sinuses, throat, respiratory and upper alimentary systems, face, jaws and the other head and neck systems. Head and neck oncology, facial plastic and reconstructive surgery and the treatment of disorders of hearing and voice are fundamental areas of expertise.
2552 WALNUT AVENUE, Tustin, CA 92780
Open in Google Maps ↗

Other Identifiers 2

Medicare PINW18895CA
Medicare UPINH58685CA

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)

Charles K. Oh, Md Inc. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to Charles K. Oh, MD Inc., which bills Medicare for the services this clinician delivers.

Clinician (1)

Charles Oh, M.D.
Otolaryngology
NPI 1780689042
2552 WALNUT AVE SUITE 130
Tustin, CA 92780
(714) 508-1600
✔ PECOS✔ Accepts Medicare0.2 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 Charles K. Oh, MD Inc.'s NPI number?

The NPI number for Charles K. Oh, MD Inc. is 1437110327. It was assigned to this organization in the NPPES registry on March 30, 2006.

Where is Charles K. Oh, MD Inc. located?

Charles K. Oh, MD Inc. is located at 2552 Walnut Avenue 130, Tustin, CA 92780. The listed phone number is (714) 508-1600.

What is Charles K. Oh, MD Inc.'s specialty?

The primary specialty registered for this NPI is Otolaryngology with taxonomy code 207Y00000X.

Is Charles K. Oh, MD Inc. enrolled in Medicare?

Yes. Charles K. Oh, MD Inc. is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Charles K. Oh, MD Inc.?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Otolaryngology) reassigns their Medicare billing to Charles K. Oh, MD 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. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Charles K. Oh, MD Inc. was last updated on November 6, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.