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DIANA LAU M.D.
NPI 1669600011
Orthopaedic Surgery in Los Alamitos, CA

Active since June 24, 2009PECOS Enrolled
3851 KATELLA AVE STE 150, LOS ALAMITOS, CA 90720(562) 314-1400 Get Directions Write a Review

NPPES record last updated: December 18, 2023. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Dec 5, 2023, Jun 26, 2020, Nov 14, 2017 and 1 more (4 updates tracked since 2015).

About Diana Lau M.d. NPPES

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

DIANA LAU M.D. (NPI 1669600011) is an individual orthopaedic surgery provider in Los Alamitos, California, licensed in California (A124135) and active in the NPI registry since June 2009. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1669600011
Entity TypeIndividualFemale
Primary Taxonomy207X00000X
Provider Legal NameDIANA LAUCredential: M.D.
Location Address3851 KATELLA AVE STE 150Los Alamitos, CA 90720-3353
Mailing Address6230 Irvine Blvd # 426Irvine, CA 92620-2103
Phone(562) 314-1400
Sole ProprietorNo
Enumeration DateJune 24, 2009
Last NPPES UpdateDecember 18, 20234 updates tracked since enumeration
NPPES CertifiedDecember 18, 2023
✔ NPI 1669600011 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyOrthopaedic SurgeryAllopathic & Osteopathic Physicians
Taxonomy Code207X00000X
License✔ Licensed in CA · A124135
Definition
An orthopaedic surgeon is trained in the preservation, investigation and restoration of the form and function of the extremities, spine and associated structures by medical, surgical and physical means. An orthopaedic surgeon is involved with the care of patients whose musculoskeletal problems include congenital deformities, trauma, infections, tumors, metabolic disturbances of the musculoskeletal system, deformities, injuries and degenerative diseases of the spine, hands, feet, knee, hip, shoulder and elbow in children and adults. An orthopaedic surgeon is also concerned with primary and secondary muscular problems and the effects of central or peripheral nervous system lesions of the musculoskeletal system.
Also ListedOrthopaedic Surgery · Sports MedicineTaxonomy 207XX0005X · License A124135 (CA)
3851 KATELLA AVE STE 150, Los Alamitos, CA 90720
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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Diana Lau M.d. 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 Diana Lau reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Orthowest
23 mi
Orthopaedic Surgery
24331 EL TORO RD STE 200
Laguna Woods, CA 92637
  • Reassigned Medicare billing, California enrollment
  • 57 clinicians in this Medicare group
NPI 1760007330 (949) 586-3200

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 90720 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
$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

Medication Reconciliation
The MIPS eligible clinician performs medication reconciliation for at least one transition of care in which the patient is transitioned into the care of the MIPS eligible clinician.
97%183 patients4/55-star benchmark: 100%
Patient-Specific Education
The MIPS eligible clinician must use clinically relevant information from CEHRT to identify patient-specific educational resources and provide access to those materials to at least one unique patient seen by the MIPS eligible clinician.
1%252 patients1/55-star benchmark: 97%
Provide Patient Access
At least one patient seen by the MIPS eligible clinician during the performance period is provided timely access to view online, download, and transmit to a third party their health information subject to the MIPS eligible clinician's discretion to withhold…
35%252 patients2/55-star benchmark: 100%
Secure Messaging
For at least one unique patient seen by the MIPS eligible clinician during the performance period, a secure message was sent using the electronic messaging function of CEHRT to the patient (or the patient-authorized representative), or in response to a secure…
1%252 patients1/55-star benchmark: 89%
View, Download, or Transmit (VDT)
At least one patient seen by the MIPS eligible clinician during the performance period (or patient-authorized representative) views, downloads or transmits their health information to a third party during the performance period.
12%252 patients
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 5

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

GRIETJE VAN DYK MD
Orthopaedic Surgery
3851 KATELLA AVE STE 150
LOS ALAMITOS, CA 90720
Orange County (562) 314-1400
ORTHOWEST
Orthopaedic Surgery
3851 KATELLA AVE STE 150
LOS ALAMITOS, CA 90720
Orange County (562) 314-1400
DR. ANDREW MAXWELL HANFLIK MD
Orthopaedic Surgery
3851 KATELLA AVE STE 150
LOS ALAMITOS, CA 90720
Orange County (562) 314-1400
PERRY ROBERT SECOR MD
Orthopaedic Surgery
3851 KATELLA AVE STE 150
LOS ALAMITOS, CA 90720
Orange County (562) 314-1400
ORTHOWEST
Durable Medical Equipment & Medical Supplies
3851 KATELLA AVE STE 150
LOS ALAMITOS, CA 90720
Orange County (562) 314-1400

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 Lau's NPI number?

The NPI number for Diana Lau is 1669600011. It was assigned to this individual provider in the NPPES registry on June 24, 2009.

Where is Diana Lau located?

Diana Lau practices at 3851 Katella Ave Ste 150, Los Alamitos, CA 90720. The listed phone number is (562) 314-1400.

What is Diana Lau's specialty?

The primary specialty registered for this NPI is Orthopaedic Surgery with taxonomy code 207X00000X.

Is Diana Lau enrolled in Medicare?

Yes. Diana Lau is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Diana Lau's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Diana Lau reassigns Medicare benefits to Orthowest (Laguna Woods, 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 Lau'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 Lau was last updated on December 18, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.