PREMIER NEPHROLOGY OF ORANGE COUNTY INC
NPI 1548817836
Internal Medicine - Nephrology in Fountain Valley, CA

Q: What is Premier Nephrology Of Orange County Inc's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.

Active since August 21, 2019

11100 WARNER AVE STE 158, FOUNTAIN VALLEY, CA 92708(714) 486-2586 Get Directions Write a Review

NPPES record last updated: September 16, 2019. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Sep 16, 2019, Aug 21, 2019 (2 updates tracked since 2019).

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About Premier Nephrology Of Orange County Inc NPPES

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

PREMIER NEPHROLOGY OF ORANGE COUNTY INC (NPI 1548817836) is a healthcare organization registered as a nephrology in Fountain Valley, California and active in the NPI registry since August 2019. The organization lists Philip S. Yang, President, as its authorized official.

NPPES Registry Identity

NPI1548817836

Entity TypeOrganization

Primary Taxonomy207RN0300X

Legal Business NamePREMIER NEPHROLOGY OF ORANGE COUNTY INC

Location Address11100 WARNER AVE STE 158Fountain Valley, CA 92708-7510

Mailing Address11100 Warner Ave Ste 158Fountain Valley, CA 92708-7510 · (714) 486-2586

Phone(714) 486-2586

Organization SubpartNo

Authorized OfficialPhilip S. YangPresident · (714) 486-2586

Enumeration DateAugust 21, 2019

Last NPPES UpdateSeptember 16, 20192 updates tracked since enumeration

✔ NPI 1548817836 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · NephrologyAllopathic & Osteopathic Physicians

Taxonomy Code207RN0300X

Definition

An internist who treats disorders of the kidney, high blood pressure, fluid and mineral balance and dialysis of body wastes when the kidneys do not function. This specialist consults with surgeons about kidney transplantation.

11100 WARNER AVE STE 158, Fountain Valley, CA 92708

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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)

Premier Nephrology Of Orange County Inc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 3 clinicians reassign Medicare billing to Premier Nephrology Of Orange County Inc, which bills Medicare for the services they deliver. Of these, 3 practice at this address. They are listed nearest first.

Clinicians, nearest first (3)

Son Dinh, M.D.

Nephrology

NPI 1174564256

11100 WARNER AVE STE 158
Fountain Valley, CA 92708

(714) 486-2586

✔ PECOS✔ Accepts MedicareSame address

Essam Mostafa, M.D.

Nephrology

NPI 1316932270

11100 WARNER AVE STE 158
Fountain Valley, CA 92708

(714) 486-2586

✔ PECOS✔ Accepts MedicareSame address

Philip Yang, MD

Nephrology

NPI 1821157553

11100 WARNER AVE STE 158
Fountain Valley, CA 92708

(714) 486-2586

✔ 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 Premier Nephrology Of Orange County Inc's NPI number?

The NPI number for Premier Nephrology Of Orange County Inc is 1548817836. It was assigned to this organization in the NPPES registry on August 21, 2019.

Where is Premier Nephrology Of Orange County Inc located?

Premier Nephrology Of Orange County Inc is located at 11100 Warner Ave Ste 158, Fountain Valley, CA 92708. The listed phone number is (714) 486-2586.

What is Premier Nephrology Of Orange County Inc's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.

Is Premier Nephrology Of Orange County Inc enrolled in Medicare?

Yes. Premier Nephrology Of Orange County Inc is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Premier Nephrology Of Orange County Inc?

According to the CMS Revalidation Reassignment List (October 2026 release), 3 clinicians, all in Nephrology, reassign their Medicare billing to Premier Nephrology Of Orange County 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, 3 practice at this address. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Premier Nephrology Of Orange County Inc was last updated on September 16, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.