Lilly Chang, OD
Optometrist · Mountain View
- Medicare standing
- Clear
- Enrolled, allowed to bill and order, not excluded
- Plans that list them
- Not verified
- Not the same as out of network.
- Office
- 1
Offices
1 location
Plan participation
Not verified
We could not verify current plan participation for this doctor. This does not mean they are out of network. Call Dr. Chang’s office at (650) 603-8766 to ask if they take your plan before you enroll.
Original Medicare doctor bills
$402,207
Medicare paid this office $402,207 for 3,294 people.
This is what Medicare paid the clinician — not Medicare Advantage, and not the pharmacy.
| New patient complete exam of visual system | 1,298 | $182,706 | $141 |
| Established patient complete exam of visual system | 1,357 | $162,085 | $119 |
| Established patient problem focused exam of visual system | 442 | $39,921 | $87 |
| New patient problem focused exam of visual system | 202 | $16,472 | $82 |
| Photography of the retina | 12 | $299 | $25 |
Who their Medicare patients are
3,294 Original Medicare patients in 2024. Average age 78 · Under 65 8% · 85 and older 31% · Women 55% · Also on Medicaid 85% · Health risk score 2.42. Sicker patients than 9 in 10 peers; the typical optometry clinician is at 0.97.
Conditions among them: High blood pressure 75% · Depression 57% · Dementia 57% · Diabetes 48% · Chronic kidney disease 39% · Heart failure 33% · Coronary heart disease 31% · Atrial fibrillation 31% · COPD 29% · Stroke 26% · Cancer 13%.
The office billed $686,910, Medicare allowed $508,868 and paid $402,207; for 3,344 services of 12 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 | 3,294 | 3,344 | 78 | 2.42 | $686,910 | $402,207 |
| 2023 | 2,047 | 2,116 | 78 | 2.36 | $424,136 | $251,648 |
| 2022 | 1,554 | 1,684 | 76 | 2.35 | $286,969 | $177,054 |
| 2021 | 563 | 691 | 75 | 1.83 | $98,251 | $70,019 |
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: 5 services
| Established patient complete exam of visual system | 883 | $107,249 | $121 |
| New patient complete exam of visual system | 720 | $102,388 | $142 |
| Established patient problem focused exam of visual system | 332 | $30,481 | $88 |
| New patient problem focused exam of visual system | 118 | $9,836 | $83 |
| Photography of the retina | 13 | $401 | $31 |
2022: 8 services
| New patient complete exam of visual system | 583 | $77,046 | $132 |
| Established patient complete exam of visual system | 608 | $65,827 | $108 |
| Established patient problem focused exam of visual system | 238 | $19,655 | $79 |
| New patient problem focused exam of visual system | 128 | $9,751 | $76 |
| Photography of the retina | 40 | $1,227 | $31 |
| Short return visit | 21 | $1,042 | $42 |
| Exam of visual field with extended testing | 12 | $798 | $53 |
| Imaging of optic nerve | 12 | $391 | $28 |
2021: 9 services
| New patient complete exam of visual system | 202 | $27,242 | $135 |
| Established patient complete exam of visual system | 233 | $27,172 | $116 |
| Established patient problem focused exam of visual system | 67 | $5,836 | $86 |
| New patient problem focused exam of visual system | 29 | $2,335 | $81 |
| Photography of the retina | 49 | $1,773 | $35 |
| Short return visit | 26 | $1,364 | $44 |
| Short return visit (20+ min) | 18 | $1,282 | $67 |
| Exam of visual field with extended testing | 15 | $921 | $58 |
| Imaging of optic nerve | 14 | $457 | $30 |
Medicaid work
$70,687 in 2024
Medicaid paid $70,687 for 3,716 billed services this clinician did in 2024, up to 98 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.
| OPH SVCS MEDICAL XM&EVAL COMPRE EST PT 1/>VST | 612 | $28,818 |
| OPH SVCS MEDICAL XM&EVAL COMPRE NEW PT 1/> VST | 375 | $18,268 |
| Fitting of bifocal spectacles | 513 | $8,545 |
| Frames, purchases | 777 | $5,240 |
| Ophthalmological services: medical examination and evaluation, with initiation or continuation of diagnostic and treatment program; intermediate, established patient | 158 | $4,855 |
| DETERMINATION REFRACTIVE STATE | 1,076 | $3,232 |
| Fitting of monofocal spectacles | 205 | $1,729 |
| 2024 | 3,716 | 7 | 98 | $70,687 |
| 2023 | 3,509 | 8 | 118 | $30,427 |
| 2022 | 2,367 | 7 | 91 | $24,624 |
| 2021 | 548 | 5 | 57 | $2,995 |
See the largest Medicaid services in earlier years
2023
| OPH SVCS MEDICAL XM&EVAL COMPRE EST PT 1/>VST | 469 | $7,854 |
| OPH SVCS MEDICAL XM&EVAL COMPRE NEW PT 1/> VST | 369 | $6,877 |
| Frames, purchases | 692 | $5,067 |
| Fitting of bifocal spectacles | 455 | $4,913 |
| DETERMINATION REFRACTIVE STATE | 1,294 | $4,077 |
| Fitting of monofocal spectacles | 133 | $1,023 |
| Ophthalmological services: medical examination and evaluation, with initiation or continuation of diagnostic and treatment program; intermediate, established patient | 85 | $492 |
| INTRM OPH EXAM NEW PATIENT | 12 | $125 |
2022
| Frames, purchases | 510 | $5,427 |
| OPH SVCS MEDICAL XM&EVAL COMPRE NEW PT 1/> VST | 245 | $4,632 |
| DETERMINATION REFRACTIVE STATE | 1,035 | $4,428 |
| OPH SVCS MEDICAL XM&EVAL COMPRE EST PT 1/>VST | 197 | $4,262 |
| Fitting of bifocal spectacles | 249 | $4,153 |
| Fitting of monofocal spectacles | 108 | $1,439 |
| Ophthalmological services: medical examination and evaluation, with initiation or continuation of diagnostic and treatment program; intermediate, established patient | 23 | $283 |
2021
| DETERMINATION REFRACTIVE STATE | 334 | $1,026 |
| OPH SVCS MEDICAL XM&EVAL COMPRE EST PT 1/>VST | 67 | $906 |
| Frames, purchases | 73 | $364 |
| OPH SVCS MEDICAL XM&EVAL COMPRE NEW PT 1/> VST | 62 | $356 |
| Fitting of bifocal spectacles | 12 | $343 |
Drugs they prescribed that Part D paid
This is pharmacy cost, not the office bill, and not what patients paid.
Opioids were 0% of their 11 Part D prescriptions in 2022. Too few prescriptions to judge: with under about 50 a year, a handful of patients can swing this share.
Part D prescriptions only. A drug prescribed to fewer than 11 people in a year is hidden.
Year by year
| 2022 | 11 | None | 0% (0) | None | $2,061 |
| 2021 | 21 | None | 0% (0) | 52% | $641 |
Part D prescriptions only. A drug prescribed to fewer than 11 people in a year is hidden.
See the drugs prescribed each year
2021: 1 drug
| Latanoprost | 11 | $322 | $29 |
Money from drug and device companies
$226 in 2022
| 2022 | 2 | 3 | None | $226 |
| 2021 | 1 | 2 | None | $30 |
| 2020 | 3 | 3 | None | $183 |
| 2019 | 2 | 2 | None | $145 |
Paid work is consulting, speaking, honoraria and royalties, as opposed to meals and travel.
A payment is not proof that care is biased.
| Bausch & Lomb Americas | Ultra Multifocal Toric | $133 | 2 payments
|
| Johnson & Johnson Vision Care | Acuvue | $93 | 1 payment
|
See all 3 published payments
| Johnson & Johnson Vision Care | Meals · 2022-08-04 | Acuvue | $93 |
| Bausch & Lomb Americas | Meals · 2022-04-26 | Ultra Multifocal Toric | $111 |
| Bausch & Lomb Americas | Meals · 2022-01-18 | Lotemax Sm | $22 |
See earlier years (2021, 2020, 2019)
2021: $30
| Bausch & Lomb a division of Bausch Health US | Lotemax Sm | $30 | 2 payments
|
2020: $183
| CooperVision | Multiple Brands Contact Lens | $95 | 1 payment
|
| Johnson & Johnson Vision Care | Acuvue | $46 | 1 payment
|
| Alcon Vision | Acrysof Iq Panoptix | $43 | 1 payment
|
2019: $145
| Bausch & Lomb a division of Bausch Health US | Biotrue | $125 | 1 payment
|
| Visioneering Technologies | None | $21 | 1 payment
|
Checkups this office reported
Medicare did not publish checkup rates for this clinician.
- Medicare’s overall office score
- 75.0 / 100
- Scores the office’s reporting and systems. It is not a grade for how the doctor treats you.
Professional record
- NPI
- 1619521259
- Licence
- CA 34315TLG
More record details
- Sole proprietor
- No
- Taxonomy
- Federal specialty code 152W00000X (152W00000X)
- Mailing address
- 680 Macon Rd, 129 Medical Group, Mountain View, CA, 94035
- NPI first listed
- 2019-07-31
- NPI last updated
- 2026-08-27
- NPI record certified
- 2026-08-27
This is when the NPI record was last certified, not a medical board exam.