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DR. DIANA KIM PHUNG NGUYEN PHAM MD
NPI 1013064005
Family Medicine in Fountain Valley, CA

Active since January 04, 2007PECOS EnrolledAccepts Medicare Assignment
18642 BUSHARD ST, FOUNTAIN VALLEY, CA 92708(714) 883-0771(714) 962-2321 Get Directions Write a Review

NPPES record last updated: November 4, 2009. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dr. Diana Kim Phung Nguyen Pham Md NPPES

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

DR. DIANA KIM PHUNG NGUYEN PHAM MD (NPI 1013064005) is an individual family medicine provider in Fountain Valley, California, licensed in California (A83986) and active in the NPI registry since January 2007. She is enrolled in Medicare PECOS and is a graduate of Other (2000).

NPPES Registry Identity

NPI1013064005
Entity TypeIndividualFemale
Primary Taxonomy207Q00000X
Provider Legal NameDR. DIANA KIM PHUNG NGUYEN PHAMCredential: MD
Location Address18642 BUSHARD STFountain Valley, CA 92708-7209
Mailing Address18642 Bushard StFountain Valley, CA 92708-7209 · (714) 883-0771 · Fax (714) 962-2321
Phone(714) 883-0771
Fax(714) 962-2321
Sole ProprietorNo
Medical School CMSOtherGraduated 2000
Enumeration DateJanuary 4, 2007
Last NPPES UpdateNovember 4, 2009
✔ NPI 1013064005 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207Q00000X
License✔ Licensed in CA · A83986
Definition
Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.
18642 BUSHARD ST, Fountain Valley, CA 92708
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Other Names 1

Professional Name (2)Dr. Diana Kim Phung Nguyen Md

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Diana Kim Phung Nguyen Pham Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID5193770188
PECOS Enrollment IDI20050314000500
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 Diana Nguyen Pham reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Omid Vesal, MD, Medical Corporation
7.3 mi
Internal Medicine
2500 ALTON PKWY, SUITE 101
Irvine, CA 92606
  • Reassigned Medicare billing, California enrollment
  • 3 clinicians in this Medicare group
NPI 1912947110 (949) 222-2722

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 92708 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
$96.36 typical visit price
range $62.96 – $187.60
Typical copayment $24.09 (range $15.74 – $46.90)
Most-billed visit code 99203
Established Patient
$109.96 typical visit price
range $20.84 – $153.61
Typical copayment $27.49 (range $5.21 – $38.40)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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 Diana Nguyen Pham's NPI number?

The NPI number for Diana Nguyen Pham is 1013064005. It was assigned to this individual provider in the NPPES registry on January 4, 2007. The provider is also known as Dr. Diana Kim Phung Nguyen MD.

Where is Diana Nguyen Pham located?

Diana Nguyen Pham practices at 18642 Bushard St, Fountain Valley, CA 92708. The listed phone number is (714) 883-0771.

What is Diana Nguyen Pham's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

Is Diana Nguyen Pham enrolled in Medicare?

Yes. Diana Nguyen Pham is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Diana Nguyen Pham's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Diana Nguyen Pham reassigns Medicare benefits to Omid Vesal, MD, Medical Corporation (Irvine, 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 Diana Nguyen Pham'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 Diana Nguyen Pham was last updated on November 4, 2009. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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.