DR. JOAN DIEM NGUYEN-KHAIT MD
NPI 1962705533
Pediatrics in Fontana, CA

Q: What is Joan Nguyen-khait's NPI number?

The NPI number for Joan Nguyen-khait is 1962705533. It was assigned to this individual provider in the NPPES registry on December 20, 2010. The provider is also known as Dr. Joan Diem Nguyen.

Q: What is Joan Nguyen-khait's specialty?

The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.

Q: When was this NPI record last updated?

The NPPES record for Joan Nguyen-khait was last updated on December 2, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.

Active since December 20, 2010PECOS Enrolled

9961 SIERRA AVE, FONTANA, CA 92335(909) 427-5000 Get Directions Write a Review

NPPES record last updated: December 2, 2021. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Dec 2, 2021, Oct 16, 2019, Oct 11, 2019 (3 updates tracked since 2019).

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About Dr. Joan Diem Nguyen-khait Md NPPES

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

DR. JOAN DIEM NGUYEN-KHAIT MD (NPI 1962705533) is an individual pediatrics provider in Fontana, California, licensed in California (A115166) and active in the NPI registry since December 2010. She is enrolled in Medicare PECOS and maintains a secondary practice location in Orange.

NPPES Registry Identity

NPI1962705533

Entity TypeIndividualFemale

Primary Taxonomy208000000X

Provider Legal NameDR. JOAN DIEM NGUYEN-KHAITCredential: MD

Location Address9961 SIERRA AVEFontana, CA 92335-6720

Mailing Address393 E Walnut StPasadena, CA 91188-0001 · (909) 427-5000

Phone(909) 427-5000

Sole ProprietorYes

Enumeration DateDecember 20, 2010

Last NPPES UpdateDecember 2, 20213 updates tracked since enumeration

NPPES CertifiedDecember 2, 2021

✔ NPI 1962705533 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatricsAllopathic & Osteopathic Physicians

Taxonomy Code208000000X

License✔ Licensed in CA · A115166

Definition

A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectrum of health services ranging from preventive healthcare to the diagnosis and treatment of acute and chronic diseases. A pediatrician deals with biological, social and environmental influences on the developing child, and with the impact of disease and dysfunction on development.

9961 SIERRA AVE, Fontana, CA 92335

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Other Names 1

Other Name (5)Dr. Joan Diem Nguyen

Secondary Practice Location 1

Location 1455 S Main St, Pediatric Residency OfficeOrange, CA 92868-3835 · Phone (714) 997-3000

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Joan Diem Nguyen-khait Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 Joan Nguyen-khait reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Southern California Permanente Medical Group

Same address

Health Maintenance Organization

9961 SIERRA AVE
Fontana, CA 92335

Reassigned Medicare billing, California enrollment
5,228 clinicians in this Medicare group

NPI 1689606196 (909) 427-3910

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 92335 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

$91.88 typical visit price

range $59.60 – $179.42

Typical copayment $22.97 (range $14.90 – $44.85)

Most-billed visit code 99203

Established Patient

$104.64 typical visit price

range $19.37 – $146.42

Typical copayment $26.16 (range $4.84 – $36.60)

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.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

SHEILA ANN VANALLEN PT

Physical Therapist

9961 SIERRA AVE, BUILDING 3A
FONTANA, CA 92335

San Bernardino County (909) 427-7727

MR. JAMES DAVID KILLEEN III M.D.

Pediatrics

9961 SIERRA AVE, KAISER PERMANENTE FONTANA - PEDIATRICS
FONTANA, CA 92335

San Bernardino County (909) 427-6960

MR. DHIRESH N PATEL RPH

Pharmacist