William Yuan To, OD
Optometry · San Mateo
- Medicare standing
- Clear
- Enrolled, allowed to bill and order, not excluded
- Plans that list them
- 8
- 3 carriers
- Offices
- 2
Offices
2 locations · William Y To OD Inc · 5 clinicians in this group
Looking this up.
Plans that list them
8 plans · 3 carriers
A missing listing does not mean out of network. Directories change, and a listing does not cover every office. Call Dr. To’s office to confirm they take your plan. Ask about the office you use, its medical group, referrals and appointments.
8 of 8 plans
| Anthem Full Dual Advantage Aligned (HMO D-SNP) | Anthem Blue Cross | Listed | Oct 3, 2026 |
| Anthem Medicare Advantage (HMO-POS) | Anthem Blue Cross | Listed | Oct 3, 2026 |
| Anthem Prime (HMO-POS) | Anthem Blue Cross Partnership Plan | Listed | Oct 3, 2026 |
| Central Health Classic Care Plan III (HMO) | Central Health Medicare Plan | Listed | Aug 15, 2026 |
| Central Health Dual Access Plan (HMO D-SNP) | Central Health Medicare Plan | Listed | Aug 15, 2026 |
| Central Health Embrace Care Plan (HMO C-SNP) | Central Health Medicare Plan | Listed, may be out of date | Sep 15, 2025 |
| Central Health Embrace Choice Plan (HMO C-SNP) | Central Health Medicare Plan | Listed | Aug 15, 2026 |
| Central Health Valor Care Plan (HMO) | Central Health Medicare Plan | Listed | Aug 15, 2026 |
Original Medicare doctor bills
$35,565
Medicare paid this office $35,565 for 204 people.
This is what Medicare paid the clinician — not Medicare Advantage, and not the pharmacy.
| Return visit (30+ min) | 144 | $21,552 | $106 |
| Exam of visual field with extended testing | 47 | $2,496 | $48 |
| Imaging of retina | 50 | $1,711 | $31 |
| Photography of the retina | 53 | $1,527 | $27 |
| Imaging of optic nerve | 46 | $1,421 | $28 |
See all 10 services
| Return visit (30+ min) | 144 | $21,552 | $106 |
| Exam of visual field with extended testing | 47 | $2,496 | $48 |
| Imaging of retina | 50 | $1,711 | $31 |
| Photography of the retina | 53 | $1,527 | $27 |
| Imaging of optic nerve | 46 | $1,421 | $28 |
| New patient visit (45+ min) | 12 | $1,056 | $88 |
| Established patient complete exam of visual system | 12 | $846 | $70 |
| Exam of the internal drainage system of eye | 12 | $325 | $23 |
| Photography of content of eyes | 12 | $280 | $20 |
| Ultrasound scan of cornea to determine thickness | 14 | $123 | $9 |
Who their Medicare patients are
204 Original Medicare patients in 2024. Average age 76 · Women 56% · Health risk score 0.82. At or below the middle of the specialty; the typical optometry clinician is at 0.97.
Conditions among them: High blood pressure 62% · Diabetes 19% · Coronary heart disease 14% · Atrial fibrillation 13% · Chronic kidney disease 10% · Cancer 10% · Depression 10% · Heart failure 8% · COPD 7% · Stroke 7%.
The office billed $81,142, Medicare allowed $54,140 and paid $35,565; for 523 services of 22 kinds.
Original Medicare patients only. A risk score of 1.0 is the average Medicare patient; higher means sicker. Any count under 11 is hidden.
Year by year
| 2024 | 204 | 523 | 76 | 0.82 | $81,142 | $35,565 |
| 2023 | 320 | 776 | 74 | 0.78 | $196,623 | $49,613 |
| 2022 | 242 | 537 | 74 | 0.87 | $159,480 | $41,432 |
Original Medicare only. A service billed for fewer than 11 people in a year is hidden, so the lines can add up to less than the year's total.
See the services billed each year
2023: 11 services
| Return visit (30+ min) | 131 | $16,456 | $102 |
| Short return visit (20+ min) | 86 | $6,668 | $64 |
| Photography of the retina | 197 | $6,196 | $30 |
| Established patient complete exam of visual system | 43 | $4,313 | $100 |
| Removal of cataract with insertion of prosthetic lens | 19 | $2,885 | $99 |
| Exam of visual field with extended testing | 50 | $2,417 | $47 |
| New patient visit (45+ min) | 16 | $2,280 | $142 |
| Imaging of optic nerve | 50 | $1,460 | $27 |
| Imaging of retina | 35 | $1,179 | $30 |
| New patient complete exam of visual system | 11 | $1,161 | $106 |
| Removal of recurring cataract in lens capsule using a laser | 15 | $1,056 | $70 |
2022: 8 services
| Short return visit (20+ min) | 79 | $10,103 | $86 |
| Return visit (30+ min) | 52 | $7,614 | $121 |
| Established patient complete exam of visual system | 51 | $5,982 | $117 |
| Removal of cataract with insertion of prosthetic lens | 21 | $3,441 | $108 |
| Photography of the retina | 92 | $3,283 | $34 |
| Exam of visual field with extended testing | 46 | $2,865 | $58 |
| Imaging of optic nerve | 40 | $1,434 | $33 |
| Imaging of retina | 15 | $613 | $36 |
Medicaid work
$12,085 in 2023
Medicaid paid $12,085 for 290 billed services this clinician did in 2023, up to 24 people in a month for one service.
Medicaid and CHIP claims where this clinician did the service, fee-for-service and managed care together. Any month with fewer than 11 patients is hidden, so small Medicaid practices undercount.
| DETERMINATION REFRACTIVE STATE | 163 | $4,646 |
| FUNDUS PHOTOGRAPHY W/INTERPRETATION & REPORT | 83 | $3,286 |
| OPH SVCS MEDICAL XM&EVAL COMPRE EST PT 1/>VST | 16 | $2,672 |
| Fitting of monofocal spectacles | 28 | $1,481 |
| 2023 | 290 | 4 | 24 | $12,085 |
| 2022 | 159 | 4 | 23 | $8,407 |
See the largest Medicaid services in earlier years
2022
| OPH SVCS MEDICAL XM&EVAL COMPRE EST PT 1/>VST | 50 | $5,526 |
| DETERMINATION REFRACTIVE STATE | 82 | $1,744 |
| Fitting of monofocal spectacles | 13 | $661 |
| FUNDUS PHOTOGRAPHY W/INTERPRETATION & REPORT | 14 | $476 |
Drugs they prescribed that Part D paid
$93,443
Pharmacies billed $93,443 in 2024.
This is pharmacy cost, not the office bill, and not what patients paid.
Opioids were 0% of their Part D prescriptions (0 of 412) in 2024. At or below the middle of the specialty; the typical optometry clinician is at 0%.
164 generic and 248 brand-name prescriptions · $93,443 in drug cost.
Part D prescriptions only. The opioid rate is opioid prescriptions as a share of all this clinician's Part D prescriptions; surgeons and pain specialists run higher than others, so it is shown against the same specialty.
| Lumigan | 44 | $21,981 | $500 |
| Vyzulta | 49 | $19,718 | $402 |
| Xiidra | 20 | $16,405 | $820 |
| Restasis | 11 | $9,603 | $873 |
| Cyclosporine | 16 | $4,505 | $282 |
See all 11 drugs
| Lumigan | 44 | $21,981 | $500 |
| Vyzulta | 49 | $19,718 | $402 |
| Xiidra | 20 | $16,405 | $820 |
| Restasis | 11 | $9,603 | $873 |
| Cyclosporine | 16 | $4,505 | $282 |
| Brimonidine Tartrate-Timolol | 16 | $2,251 | $141 |
| Travoprost | 12 | $1,966 | $164 |
| Latanoprost | 103 | $988 | $10 |
| Prednisolone Acetate | 17 | $668 | $39 |
| Dorzolamide-Timolol | 37 | $498 | $13 |
| Timolol Maleate | 25 | $125 | $5 |
Year by year
| 2024 | 412 | 83 | 0% (0) | 60% | $93,443 |
| 2023 | 407 | 124 | 0% (0) | 44% | $80,015 |
| 2022 | 127 | 59 | 0% (0) | 52% | $51,415 |
Part D prescriptions only. A drug prescribed to fewer than 11 people in a year is hidden.
See the drugs prescribed each year
2023: 12 drugs
| Lumigan | 53 | $22,059 | $416 |
| Xiidra | 18 | $19,017 | $1,057 |
| Vyzulta | 22 | $8,678 | $394 |
| Cyclosporine | 12 | $4,781 | $398 |
| Brimonidine Tartrate-Timolol | 23 | $4,113 | $179 |
| Travoprost | 16 | $2,788 | $174 |
| Latanoprost | 70 | $1,530 | $22 |
| Fluorometholone | 20 | $1,353 | $68 |
| Dorzolamide-Timolol | 46 | $1,270 | $28 |
| Prednisolone Acetate | 20 | $795 | $40 |
| Neomycin-Polymyxin-Dexameth | 28 | $447 | $16 |
| Timolol Maleate | 19 | $161 | $8 |
2022: 5 drugs
| Restasis | 14 | $19,085 | $1,363 |
| Vyzulta | 15 | $7,149 | $477 |
| Travoprost | 13 | $3,032 | $233 |
| Brimonidine Tartrate-Timolol | 11 | $2,064 | $188 |
| Dorzolamide-Timolol | 12 | $415 | $35 |
Money from drug and device companies
$1,216 in 2025
| 2025 | 6 | 19 | None | $1,216 |
| 2024 | 5 | 19 | $1,000 | $2,010 |
| 2023 | 7 | 64 | $17,050 | $22,374 |
| 2022 | 9 | 35 | $19,021 | $20,446 |
| 2021 | 13 | 93 | $18,400 | $24,787 |
| 2020 | 11 | 48 | $6,700 | $9,417 |
| 2019 | 10 | 37 | None | $2,377 |
Paid work is consulting, speaking, honoraria and royalties, as opposed to meals and travel.
A payment is not proof that care is biased.
| Alcon Vision | Precision7 | $520 | 9 payments
|
| CooperVision | Myday Contact Lens | $292 | 4 payments
|
| Optos | Nfc-700 | $129 | 1 payment
|
| Dompe US | Oxervate | $125 | 1 payment
|
| Bausch & Lomb Americas | Infuse | $76 | 2 payments
|
| Johnson & Johnson Vision Care | None | $74 | 2 payments
|
See all 19 published payments
| Johnson & Johnson Vision Care | Meals · 2025-11-25 | None | $15 |
| Alcon Vision | Meals · 2025-11-18 | Dailies Total1 | $18 |
| Bausch & Lomb Americas | Meals · 2025-10-15 | Infuse | $38 |
| Bausch & Lomb Americas | Meals · 2025-10-15 | Infuse | $37 |
| Alcon Vision | Meals · 2025-09-10 | Precision7 | $66 |
| Alcon Vision | Meals · 2025-08-12 | None | $61 |
| Alcon Vision | Meals · 2025-08-12 | None | $20 |
| Alcon Vision | Meals · 2025-08-05 | Precision7 | $158 |
| Optos | Entertainment · 2025-06-17 | Nfc-700 | $129 |
| CooperVision | Meals · 2025-05-29 | Misight Contact Lens | $46 |
| Dompe US | Meals · 2025-05-08 | Oxervate | $125 |
| Alcon Vision | Meals · 2025-04-04 | None | $52 |
| Johnson & Johnson Vision Care | Meals · 2025-03-19 | None | $59 |
| CooperVision | Meals · 2025-03-02 | Myday Contact Lens | $140 |
| Alcon Vision | Meals · 2025-02-12 | Precision7 | $52 |
| CooperVision | Meals · 2025-02-08 | Misight Contact Lens | $38 |
| Alcon Vision | Meals · 2025-01-30 | Precision7 | $60 |
| CooperVision | Meals · 2025-01-29 | Clariti Contact Lens | $69 |
| Alcon Vision | Meals · 2025-01-16 | Precision7 | $33 |
See earlier years (2024, 2023, 2022, 2021, 2020, 2019)
2024: $2,010
| Alcon Vision | Precision 1 | $1,540 | 11 payments
|
| Johnson & Johnson Vision Care | None | $229 | 4 payments
|
| Bausch & Lomb Americas | Infuse | $160 | 2 payments
|
| Optos | Nfc-700 | $50 | 1 payment
|
| ABB Con-Cise Optical Group | Spectacle Lenses | $32 | 1 payment
|
2023: $22,374
| Bausch & Lomb Americas | Infuse | $20,643 | 42 payments
|
| Alcon Vision | Dailies Total1 | $713 | 6 payments
|
| CooperVision | Myday Contact Lens | $472 | 10 payments
|
| Sight Sciences | Tearcare System | $350 | 1 payment
|
| Optos | Nfc-700 | $87 | 1 payment
|
| AbbVie | Vuity | $57 | 2 payments
|
| Johnson & Johnson Vision Care | Acuvue | $52 | 2 payments
|
2022: $20,446
| Sight Sciences | Tearcare Smartlid | $17,906 | 14 payments
|
| Optos | Oct Ophthalmoscope | $1,244 | 2 payments
|
| Johnson & Johnson Vision Care | Acuvue | $401 | 7 payments
|
| Bausch & Lomb Americas | Infuse | $375 | 1 payment
|
| CooperVision | Myday Contact Lens | $243 | 5 payments
|
| Lombart Brothers | Opd-III | $98 | 2 payments
|
| Alcon Vision | Total30 | $63 | 2 payments
|
| ABB Con-Cise Optical Group | Spectacle Lenses | $59 | 1 payment
|
| Carl Zeiss Meditec | Cirrus Hd-Oct | $57 | 1 payment
|
2021: $24,787
| Bausch & Lomb a division of Bausch Health US | Infuse | $22,872 | 49 payments
|
| Johnson & Johnson Vision Care | Acuvue | $514 | 11 payments
|
| Alcon Vision | Precision 1 | $327 | 8 payments
|
| CooperVision | Misight Contact Lens | $297 | 8 payments
|
| Optos | Panoramic Ophthalmoscope | $146 | 1 payment
|
| ABB Con-Cise Optical Group | None | $126 | 4 payments
|
| Johnson & Johnson Surgical Vision | Acuvue | $115 | 1 payment
|
| Plexus Optix | Unity Biosync Contact Lenses With Hydramist | $92 | 2 payments
|
| Visioneering Technologies | None | $90 | 3 payments
|
| Novartis Pharmaceuticals | Xiidra | $85 | 3 payments
|
| Topcon Medical Systems | None | $64 | 1 payment
|
| Sight Sciences | Tearcare Smartlid | $43 | 1 payment
|
| Sun Pharmaceutical Industries | Cequa | $16 | 1 payment
|
2020: $9,417
| Bausch & Lomb a division of Bausch Health US | Ultra | $7,926 | 28 payments
|
| Optos | P200te | $1,108 | 5 payments
|
| Alcon Vision | Dailies | $84 | 4 payments
|
| Johnson & Johnson Vision Care | Acuvue | $66 | 2 payments
|
| Allergan | None | $60 | 1 payment
|
| CooperVision | Multiple Brands Contact Lens | $55 | 2 payments
|
| Johnson & Johnson Surgical Vision | None | $45 | 1 payment
|
| Visioneering Technologies | None | $24 | 1 payment
|
| Plexus Optix | Unity Biosync Contact Lenses With Hydramist | $22 | 1 payment
|
| Carl Zeiss Meditec | None Specified | $17 | 1 payment
|
| ABB Con-Cise Optical Group | Contact Lens | $11 | 2 payments
|
2019: $2,377
| Optos | P200dtx | $986 | 13 payments
|
| Visioneering Technologies | None | $337 | 5 payments
|
| Bausch & Lomb a division of Bausch Health US | Biotrue | $320 | 6 payments
|
| Johnson & Johnson Vision Care | Acuvue | $246 | 2 payments
|
| Topcon Medical Systems | Oct Triton | $177 | 1 payment
|
| CooperVision | Multiple Brands Contact Lens | $129 | 3 payments
|
| Optovue | Xr | $71 | 1 payment
|
| Alcon Vision | Precision 1 | $51 | 3 payments
|
| Johnson & Johnson Surgical Vision | None | $40 | 2 payments
|
| ABB Con-Cise Optical Group | Contact Lens | $20 | 1 payment
|
Professional record
- NPI
- 1952756678
- Licence
- CA 34153TLG
- Group
- William Y To OD Inc
- Gender
- Male
More record details
- Sole proprietor
- Yes
- Taxonomy
- Federal specialty code 152W00000X (152W00000X)
- Mailing address
- 1750 Lundy Ave Unit 612899, San Jose, CA, 95161
- NPI first listed
- 2016-05-02
- NPI last updated
- 2025-09-03
- NPI record certified
- 2025-09-03
This is when the NPI record was last certified, not a medical board exam.
Extra NPI addresses: 9309 Glacier Hwy Ste A103, Juneau, AK, 99801 · 377 Santana Row Ste 1115, San Jose, CA, 95128 · 6000 Bollinger Canyon Rd Ste 1104, San Ramon, CA, 94583