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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DAGNY ZHU LUONG MD
NPI 1790044626
Ophthalmology in Orange, CA

Active since May 12, 2012PECOS Enrolled
1010 W LA VETA AVE STE 615, ORANGE, CA 92868(714) 983-5001(714) 475-3680 Get Directions Write a Review

NPPES record last updated: September 1, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Sep 1, 2026, Mar 17, 2018, Oct 24, 2017 and 1 more (4 updates tracked since 2016).

About Dagny Zhu Luong Md NPPES

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

DAGNY ZHU LUONG MD (NPI 1790044626) is an individual ophthalmology provider in Orange, California, licensed in California (A127715) and active in the NPI registry since May 2012. She is enrolled in Medicare PECOS and maintains a secondary practice location in Fullerton.

NPPES Registry Identity

NPI1790044626
Entity TypeIndividualFemale
Primary Taxonomy207W00000X
Provider Legal NameDAGNY ZHU LUONGCredential: MD
Location Address1010 W LA VETA AVE STE 615Orange, CA 92868-4310
Mailing Address1010 W La Veta Ave Ste 615Orange, CA 92868-4310 · (714) 983-5001 · Fax (714) 475-3680
Phone(714) 983-5001
Fax(714) 475-3680
Sole ProprietorNo
Enumeration DateMay 12, 2012
Last NPPES UpdateSeptember 1, 20264 updates tracked since enumeration
NPPES CertifiedSeptember 1, 2026
✔ NPI 1790044626 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyOphthalmologyAllopathic & Osteopathic Physicians
Taxonomy Code207W00000X
License✔ Licensed in CA · A127715
Definition
An ophthalmologist has the knowledge and professional skills needed to provide comprehensive eye and vision care. Ophthalmologists are medically trained to diagnose, monitor and medically or surgically treat all ocular and visual disorders. This includes problems affecting the eye and its component structures, the eyelids, the orbit and the visual pathways. In so doing, an ophthalmologist prescribes vision services, including glasses and contact lenses.
Also ListedOphthalmology · Cornea and External Diseases SpecialistTaxonomy 207WX0120X · License A127715 (CA)
1010 W LA VETA AVE STE 615, Orange, CA 92868
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Other Names 1

Former Name (1)Dagny Chen Zhu

Secondary Practice Location 1

Location 11400 N Harbor BlvdFullerton, CA 92835-4126 · Phone (714) 831-0091

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dagny Zhu Luong 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 Reassignments

2

Medicare enrollment records show Dagny Luong reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Dagny Zhu Luong M D Inc
Same address
Cornea and External Diseases Specialist
1010 W LA VETA AVE STE 615
Orange, CA 92868
  • Reassigned Medicare billing, California enrollment
NPI 1891645750 (714) 983-5001
Thomas S Tooma M D A Professional Corporation
8.1 mi
Ophthalmology
4220 VON KARMAN AVE STE 100
Newport Beach, CA 92660
  • Reassigned Medicare billing, California enrollment
  • 48 clinicians in this Medicare group
NPI 1922129865 (492) 847-4289

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 92868 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
$142.39 typical visit price
range $62.96 – $187.60
Typical copayment $35.59 (range $15.74 – $46.90)
Most-billed visit code 99204
Established Patient
$77.96 typical visit price
range $20.84 – $153.61
Typical copayment $19.49 (range $5.21 – $38.40)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

Reported Quality Measures

Diabetes: Eye Exam
Percentage of patients 18-75 years of age with diabetes who had a retinal or dilated eye exam by an eye care professional during the measurement period or a negative retinal exam (no evidence of retinopathy) in the 12 months prior to the measurement period
100%93 patients5/55-star benchmark: 100%
Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Other Providers at the Same Location NPPES 2

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

COASTAL DIAGNOSTIC SERVICES INC
Radiologic Technologist (Radiography)
1010 W LA VETA AVE STE 615
ORANGE, CA 92868
Orange County (888) 268-8607
DAGNY ZHU LUONG M D INC
Ophthalmology (Cornea and External Diseases Specialist)
1010 W LA VETA AVE STE 615
ORANGE, CA 92868
Orange County (714) 983-5001

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 Dagny Luong's NPI number?

The NPI number for Dagny Luong is 1790044626. It was assigned to this individual provider in the NPPES registry on May 12, 2012. The provider is also known as Dagny Chen Zhu.

Where is Dagny Luong located?

Dagny Luong practices at 1010 W La Veta Ave Ste 615, Orange, CA 92868. The listed phone number is (714) 983-5001.

What is Dagny Luong's specialty?

The primary specialty registered for this NPI is Ophthalmology with taxonomy code 207W00000X.

Is Dagny Luong enrolled in Medicare?

Yes. Dagny Luong is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Dagny Luong's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Dagny Luong reassigns Medicare benefits to 2 organizations: Dagny Zhu Luong M D Inc (Orange, CA) and Thomas S Tooma M D A Professional Corporation (Newport Beach, CA). Each 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 Dagny Luong'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 Dagny Luong was last updated on September 1, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 54 days 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.