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WILLIAM I. HAN, M.D. INC
NPI 1831381664
Clinic/Center in Fountain Valley, CA

Active since August 15, 2007
17150 EUCLID ST, SUITE 220, FOUNTAIN VALLEY, CA 92708(714) 444-3030(714) 444-3034 Get Directions Write a Review

NPPES record last updated: April 11, 2012. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About William I. Han, M.d. Inc NPPES

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

WILLIAM I. HAN, M.D. INC (NPI 1831381664) is a healthcare organization registered as a clinic/center in Fountain Valley, California and active in the NPI registry since August 2007. The organization lists William I Han, President, as its authorized official.

NPPES Registry Identity

NPI1831381664
Entity TypeOrganization
Primary Taxonomy261Q00000X
Legal Business NameWILLIAM I. HAN, M.D. INC
Location Address17150 EUCLID ST, SUITE 220Fountain Valley, CA 92708-4092
Mailing Address17150 Euclid Ave., Suite 220Fountain Valley, CA 92708-4055 · (714) 444-3030 · Fax (949) 419-2515
Phone(714) 444-3030
Fax(714) 444-3034
Organization SubpartNo
Authorized OfficialWilliam I HanPresident · (714) 444-3030
Enumeration DateAugust 15, 2007
Last NPPES UpdateApril 11, 2012
✔ NPI 1831381664 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyClinic/CenterAmbulatory Health Care Facilities
Taxonomy Code261Q00000X
License✔ Licensed in CA · A38218
Definition
A facility or distinct part of one used for the diagnosis and treatment of outpatients. Clinic/Center is irregularly defined, sometimes being limited to organizations serving specialized treatment requirements or distinct patient/client groups (e.g., radiology, poor, and public health).
17150 EUCLID ST, Fountain Valley, CA 92708
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Other Identifiers 3

Medicare UPINA85112
Medicaid00A382180CA
Medicare PINA38218

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

William I. Han, M.d. 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 William I. Han, M.D. Inc, which bills Medicare for the services this clinician delivers.

Clinician (1)

William Han, M.D.
Obstetrics/Gynecology
NPI 1043300114
17150 EUCLID ST STE 220
Fountain Valley, CA 92708
(714) 444-3030
✔ PECOS✔ Accepts MedicareSame address

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 William I. Han, M.D. Inc's NPI number?

The NPI number for William I. Han, M.D. Inc is 1831381664. It was assigned to this organization in the NPPES registry on August 15, 2007.

Where is William I. Han, M.D. Inc located?

William I. Han, M.D. Inc is located at 17150 Euclid St Suite 220, Fountain Valley, CA 92708. The listed phone number is (714) 444-3030.

What is William I. Han, M.D. Inc's specialty?

The primary specialty registered for this NPI is Clinic/Center with taxonomy code 261Q00000X.

Is William I. Han, M.D. Inc enrolled in Medicare?

Yes. William I. Han, M.D. Inc is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through William I. Han, M.D. Inc?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Obstetrics/Gynecology) reassigns their Medicare billing to William I. Han, 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. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for William I. Han, M.D. Inc was last updated on April 11, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.