NPI registry status
Active
2026 NPPES data Optometrist NPI 1841785037 OD
Verify on CMS → Nancy Tsui, OD
Optometrist in Anaheim, California.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 60,484 in Optometrist, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
931
Medicare Part D claims · 341 beneficiaries · Optometrist avg: 257
Generic prescribing
50%
generic claims · 50% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$93.65
3 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Nancy Tsui, OD filed 931 Medicare Part D claims in 2023 as an Optometrist in Anaheim, California, prescribing 50% generic.
- 931
- Part D claims, 2023
- 50%
- generic prescribing
- $93.65
- industry payments (Sunshine Act)
- ≥75th
- pct by Part D claim volume (lower-bound band)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
CMS NPPES provider registry desk
NPI 1841785037 · Optometrist
NPI-10 · ENUM-RECENT · TAX-MEGA · RX-LIGHT · BOOK-MID · PHOTO-ENUM
- NPI-10 1841785037
- ENUM-RECENT 2018
- TAX-MEGA 60K Optometrist
- RX-LIGHT 931
- BOOK-MID 8,067 in California
- PHOTO-ENUM Kirsten Johnson · 2018
Nancy Tsui, OD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
931 ≥ 75th percentile 75% of 1,370,886 prescribers are in lower value bands
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2023
What does the federal data show about Nancy Tsui, OD?
Quality data not reportedPrimary specialty
Optometrist
Medicare Part D claims
931 262% vs specialty avg
Specialty distribution in California
How Optometrist compares to other specialties among California providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Optometrist. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Practice Address
Provider Details
| NPI | 1841785037 |
|---|---|
| Specialty | Optometrist |
| Credentials | OD |
| Gender | Female |
| NPI Issued | 06/29/2018 |
Hospital and facility affiliations
Facilities where Nancy Tsui, OD bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Retina Institute OF California Medical Group, A California Medical Par
Anaheim, CA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Nancy Tsui, OD. Source: openpaymentsdata.cms.gov.
Total received
$94
Largest payer
CooperVision Inc.
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
License & disciplinary context - California MBC 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~150K California medical licensees in 2023 - they are NOT specific to Nancy Tsui, OD. To verify Nancy Tsui, OD's current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
576
Total board actions, California 2023
Across 556 cases
3.84
Actions per 1,000 licensees
California statewide rate
probation
Most common action type
186 cases
MBC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the California disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Brand-heavy
Nancy Tsui, OD - brand share 50.0%
Optometrist average
50% brand-name claims vs 50% generic, on 931 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
931
Total Claims
$146K
Total Drug Cost
341
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,655
- Total Day Supply
- 46,740
- Brand vs Generic
- 50% brand / 50% generic
- Brand Drug Cost
- $126K
- Generic Drug Cost
- $20K
Patient Demographics
- Average Patient Age
- 74.2 years
- Avg HCC Risk Score
- 1.41
- Gender Split
- 61% female / 39% male
- Age Distribution
- <65: 22, 65-74: 167, 75-84: 111, 85+: 41
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Nancy Tsui, OD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Latanoprost
Latanoprost
299 claims
- Dorzolamide-Timolol 80
Dorzolamide-Timolol
80 claims
- Prednisolone Acetate 50
Prednisolone Acetate
50 claims
- Neomycin-Polymyxin… 48
Neomycin-Polymyxin-Dexameth
48 claims
- Brimonidine Tartrate 46
Brimonidine Tartrate
46 claims
- Ketorolac Trometha… 45
Ketorolac Tromethamine
45 claims
- Alrex 44
Alrex
44 claims
- Timolol Maleate 42
Timolol Maleate
42 claims
| Drug | Claims |
|---|---|
| Latanoprost | 299 |
| Dorzolamide-Timolol Dorzolamide Hcl/Timolol Maleat | 80 |
| Prednisolone Acetate | 50 |
| Neomycin-Polymyxin-Dexameth Neomycin/Polymyxin B/Dexametha | 48 |
| Brimonidine Tartrate | 46 |
| Ketorolac Tromethamine | 45 |
| Alrex Loteprednol Etabonate | 44 |
| Timolol Maleate | 42 |
| Erythromycin Erythromycin Base | 27 |
| Restasis Cyclosporine | 26 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Optometrist Overview
How Nancy Tsui, OD fits within the Optometrist landscape nationally.
60,484
Optometrist Providers in US
56
States with Optometrist
257
Avg Claims per Provider
Nancy Tsui, OD's 931 claims are above the specialty average of 257.
Nationwide Optometrist peers with similar MIPS or enrollment year
Two federal-record peer sets for Tsui, both outside California so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2018)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Optometrist Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Tsui.
One of 8,067 Optometrist providers enrolled in California, 5 are shown here.
Dr. Douglas Aaseby
O.D.
El Dorado Hills, CA
Dr. Saloumeh Abadi
OD
Santa Monica, CA
Davoud Abbasi
Fillmore, CA
Dr. Christopher Abbott
O.D.
Santee, CA
Dr. Sara Abboud
OD
Albany, CA
Compare Optometrist nationally: see state-by-state distribution →
Frequently Asked Questions
What is Nancy Tsui, OD's specialty? ▼
Nancy Tsui, OD specializes in Optometrist and practices in Anaheim, California. Credentials: OD.
How much does Nancy Tsui, OD prescribe under Medicare Part D? ▼
In 2023, Nancy Tsui, OD wrote 931 Medicare Part D claims totaling $146K in drug costs for 341 beneficiaries.
Where is Nancy Tsui, OD located? ▼
Nancy Tsui, OD is located at 500 S ANAHEIM HILLS RD STE 234, Anaheim, CA, 92807. Phone: (714) 921-0232.
What is Nancy Tsui, OD's NPI number? ▼
Nancy Tsui, OD's National Provider Identifier (NPI) is 1841785037, issued on 06/29/2018.
Does Nancy Tsui, OD prescribe more brand-name or generic drugs? ▼
Nancy Tsui, OD's prescribing is 50% brand-name and 50% generic drugs by claim count, with $126K in brand drug costs.
How many Optometrist providers are there in the US? ▼
There are 60,484 Optometrist providers across 56 states in the US. The average Optometrist provider writes 257 Medicare Part D claims per year.
What drugs does Nancy Tsui, OD prescribe most often? ▼
Based on 2023 Medicare Part D data, Nancy Tsui, OD's most frequently prescribed drugs include Latanoprost, Dorzolamide-Timolol, Prednisolone Acetate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Nancy Tsui, OD accept Medicare? ▼
Nancy Tsui, OD appears in CMS Medicare data with 931 Part D claims and 341 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Nancy Tsui, OD's credentials? ▼
Nancy Tsui, OD's NPI is 1841785037 with credentials OD. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.