Preema Mehta Buch, MD
Ophthalmology · Castro Valley
- Medicare standing
- Clear
- Enrolled, allowed to bill and order, not excluded
- Plans that list them
- 16
- 4 carriers
- Office
- 1
- Since medical school
- 12 years
- Howard University College of Medicine, 2014
Offices
1 location · Eye Specialties Medical Group Inc. · 3 clinicians in this group
Plans that list them
16 plans · 4 carriers
A missing listing does not mean out of network. Directories change, and a listing does not cover every office. Call Dr. Buch’s office at (510) 881-8823 to confirm they take your plan. Ask about the office you use, its medical group, referrals and appointments.
16 of 16 plans
| Alignment Health BreathEasy (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Clarity (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Harmony (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Heart & Diabetes (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Heart & Diabetes CalPlus (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Heart & Diabetes Care (HMO C-SNP) | Alignment Health Plan | Listed | Sep 28, 2026 |
| Alignment Health Heart & Diabetes Choice (HMO C-SNP) | Alignment Health Plan | Listed | Sep 28, 2026 |
| Alignment Health Honor+ Plan (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health My Choice CalCare (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
| 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 |
| SCAN Balance (HMO C-SNP) | SCAN Health Plan | Listed | Oct 3, 2026 |
| SCAN Classic (HMO) | SCAN Health Plan | Listed | Oct 3, 2026 |
| SCAN MyChoice (HMO) | SCAN Health Plan | Listed | Oct 3, 2026 |
| SCAN Strive (HMO C-SNP) | SCAN Health Plan | Listed | Oct 3, 2026 |
Original Medicare doctor bills
$100,133
Medicare paid this office $100,133 for 404 people.
This is what Medicare paid the clinician — not Medicare Advantage, and not the pharmacy.
| Established patient complete exam of visual system | 268 | $31,823 | $110 |
| Established patient problem focused exam of visual system | 166 | $26,242 | $84 |
| Exam of visual field with extended testing | 117 | $7,944 | $62 |
| New patient complete exam of visual system | 63 | $7,778 | $123 |
| Removal of recurring cataract in lens capsule using a laser | 15 | $6,214 | $345 |
See all 10 services
| Established patient complete exam of visual system | 268 | $31,823 | $110 |
| Established patient problem focused exam of visual system | 166 | $26,242 | $84 |
| Exam of visual field with extended testing | 117 | $7,944 | $62 |
| New patient complete exam of visual system | 63 | $7,778 | $123 |
| Removal of recurring cataract in lens capsule using a laser | 15 | $6,214 | $345 |
| Short return visit (20+ min) | 51 | $5,033 | $87 |
| Photography of the retina | 92 | $3,632 | $39 |
| Imaging of optic nerve | 100 | $3,498 | $33 |
| Imaging of retina | 22 | $997 | $43 |
| Ultrasound scan of cornea to determine thickness | 61 | $609 | $10 |
Procedures year by year
| Procedure | 2018 | 2019 | 2020 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|
| Removal of recurring cataract in lens capsule using a laser | – | – | – | – | – | 18 |
| Transplantation of outer layer of corneal tissue | 15 | – | – | – | – | – |
Times billed to Original Medicare each year. A blank year means fewer than 11 people had it, or none: Medicare does not publish smaller counts. Medicare Advantage patients are not included.
Who their Medicare patients are
404 Original Medicare patients in 2024. Average age 74 · Under 65 8% · 85 and older 16% · Women 62% · Also on Medicaid 30% · Health risk score 1.06. At or below the middle of the specialty; the typical ophthalmology clinician is at 1.16.
Conditions among them: High blood pressure 72% · Diabetes 40% · Chronic kidney disease 25% · Coronary heart disease 18% · Depression 15% · Heart failure 14% · Cancer 12% · Atrial fibrillation 11% · COPD 9% · Stroke 8% · Dementia 4%.
The office billed $252,597, Medicare allowed $144,426 and paid $100,133; for 1,229 services of 27 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 | 404 | 1,229 | 74 | 1.06 | $252,597 | $100,133 |
| 2023 | 380 | 968 | 75 | 0.98 | $196,509 | $76,735 |
| 2022 | 239 | 381 | 77 | 0.97 | $76,195 | $31,463 |
| 2020 | 55 | 79 | 69 | 2.48 | $15,560 | $5,285 |
| 2019 | 45 | 59 | 71 | 1.87 | $25,121 | $7,382 |
| 2018 | 27 | 30 | 74 | 1.56 | $21,450 | $4,122 |
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: 8 services
| Established patient complete exam of visual system | 257 | $30,183 | $106 |
| Established patient problem focused exam of visual system | 164 | $19,696 | $80 |
| Exam of visual field with extended testing | 109 | $7,325 | $57 |
| New patient complete exam of visual system | 52 | $6,016 | $116 |
| Imaging of optic nerve | 114 | $3,496 | $28 |
| Imaging of retina | 40 | $1,174 | $28 |
| Short return visit (20+ min) | 13 | $1,009 | $72 |
| Photography of the retina | 27 | $752 | $28 |
2022: 6 services
| Established patient complete exam of visual system | 113 | $13,343 | $116 |
| Established patient problem focused exam of visual system | 106 | $9,977 | $85 |
| Exam of visual field with extended testing | 48 | $2,927 | $61 |
| New patient complete exam of visual system | 19 | $2,057 | $108 |
| Imaging of optic nerve | 47 | $1,498 | $32 |
| Imaging of retina | 15 | $561 | $37 |
2020: 2 services
| Short return visit (20+ min) | 17 | $1,218 | $53 |
| Return visit (30+ min) | 15 | $1,043 | $61 |
2019: 1 service
| Return visit (30+ min) | 16 | $1,556 | $92 |
2018: 1 service
| Transplantation of outer layer of corneal tissue | 15 | $2,652 | $177 |
Medicaid work
$15,053 in 2024
Medicaid paid $15,053 for 676 billed services this clinician did in 2024, up to 40 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 NEW PT 1/> VST | 193 | $6,877 |
| Ophthalmological services: medical examination and evaluation, with initiation or continuation of diagnostic and treatment program; intermediate, established patient | 207 | $3,687 |
| OPH SVCS MEDICAL XM&EVAL COMPRE EST PT 1/>VST | 105 | $3,227 |
| Short return visit (20+ min) | 40 | $813 |
| FUNDUS PHOTOGRAPHY W/INTERPRETATION & REPORT | 105 | $294 |
| Computerized ophthalmic diagnostic imaging (eg, optical coherence tomography [OCT]), posterior segment, with interpretation and report, unilateral or bilateral; optic nerve | 14 | $93 |
| Ophthalmic ultrasound, diagnostic; corneal pachymetry, unilateral or bilateral (determination of corneal thickness) | 12 | $62 |
| 2024 | 676 | 7 | 40 | $15,053 |
| 2023 | 194 | 3 | 26 | $3,573 |
See the largest Medicaid services in earlier years
2023
| OPH SVCS MEDICAL XM&EVAL COMPRE NEW PT 1/> VST | 111 | $1,817 |
| OPH SVCS MEDICAL XM&EVAL COMPRE EST PT 1/>VST | 39 | $1,185 |
| Ophthalmological services: medical examination and evaluation, with initiation or continuation of diagnostic and treatment program; intermediate, established patient | 44 | $570 |
Drugs they prescribed that Part D paid
$113,723
Pharmacies billed $113,723 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 812) in 2024. At or below the middle of the specialty; the typical ophthalmology clinician is at 0%.
391 generic and 421 brand-name prescriptions · $113,723 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.
| Restasis | 29 | $31,248 | $1,078 |
| Xiidra | 11 | $15,976 | $1,452 |
| Simbrinza | 59 | $13,633 | $231 |
| Lumigan | 31 | $13,578 | $438 |
| Vyzulta | 17 | $7,251 | $427 |
See all 15 drugs
| Restasis | 29 | $31,248 | $1,078 |
| Xiidra | 11 | $15,976 | $1,452 |
| Simbrinza | 59 | $13,633 | $231 |
| Lumigan | 31 | $13,578 | $438 |
| Vyzulta | 17 | $7,251 | $427 |
| Rhopressa | 13 | $4,056 | $312 |
| Travoprost | 18 | $3,629 | $202 |
| Latanoprost | 234 | $2,439 | $10 |
| Brimonidine | 61 | $2,130 | $35 |
| Cyclosporine | 16 | $1,861 | $116 |
| Prednisolone Acetate | 34 | $1,532 | $45 |
| Dorzolamide-Timolol | 69 | $799 | $12 |
| Timolol Maleate | 86 | $661 | $8 |
| Erythromycin | 39 | $431 | $11 |
| Dorzolamide | 19 | $381 | $20 |
Year by year
| 2024 | 812 | 166 | 0% (0) | 52% | $113,723 |
| 2023 | 399 | 107 | 0% (0) | 55% | $67,302 |
| 2022 | 189 | 78 | 0% (0) | 57% | $35,118 |
| 2021 | 43 | 18 | 0% (0) | 72% | $12,887 |
| 2020 | 153 | 30 | 0% (0) | 68% | $50,560 |
| 2019 | 78 | 44 | None | 41% | $6,809 |
| 2018 | 202 | 69 | 0% (0) | 49% | $12,279 |
| 2017 | 74 | 28 | 0% (0) | 62% | $8,347 |
| 2016 | 44 | 26 | 0% (0) | 52% | $2,386 |
| 2015 | 91 | 44 | 0% (0) | 47% | $5,703 |
| 2014 | 28 | 17 | 0% (0) | None | $596 |
Part D prescriptions only. A drug prescribed to fewer than 11 people in a year is hidden.
See the drugs prescribed each year
2023: 10 drugs
| Restasis | 13 | $15,368 | $1,182 |
| Xiidra | 11 | $9,848 | $895 |
| Lumigan | 17 | $7,666 | $451 |
| Vyzulta | 16 | $7,091 | $443 |
| Rocklatan | 11 | $4,217 | $383 |
| Latanoprost | 157 | $3,521 | $22 |
| Brimonidine | 34 | $1,508 | $44 |
| Dorzolamide-Timolol | 24 | $1,079 | $45 |
| Dorzolamide | 22 | $1,039 | $47 |
| Timolol Maleate | 27 | $271 | $10 |
2022: 5 drugs
| Restasis | 11 | $16,483 | $1,498 |
| Lumigan | 16 | $6,486 | $405 |
| Latanoprost | 77 | $2,212 | $29 |
| Brimonidine | 12 | $976 | $81 |
| Erythromycin | 11 | $130 | $12 |
2021: 1 drug
| Restasis | 13 | $6,630 | $510 |
2020: 4 drugs
| Restasis | 49 | $37,431 | $764 |
| Olopatadine | 15 | $781 | $52 |
| Prednisolone Acetate | 21 | $619 | $29 |
| Latanoprost | 11 | $252 | $23 |
2019: 2 drugs
| Prednisolone Acetate | 17 | $592 | $35 |
| Erythromycin | 18 | $269 | $15 |
2018: 5 drugs
| Prednisolone Acetate | 46 | $1,643 | $36 |
| Moxifloxacin | 14 | $533 | $38 |
| Ketorolac Tromethamine | 28 | $467 | $17 |
| Latanoprost | 27 | $295 | $11 |
| Erythromycin | 14 | $282 | $20 |
2017: 1 drug
| Prednisolone Acetate | 24 | $1,009 | $42 |
2016: 1 drug
| Prednisolone Acetate | 12 | $453 | $38 |
2015: 1 drug
| Prednisolone Acetate | 12 | $462 | $39 |
Money from drug and device companies
$18 in 2025
| 2025 | 1 | 1 | None | $18 |
| 2024 | 6 | 9 | None | $211 |
| 2023 | 1 | 1 | None | $22 |
| 2022 | 3 | 5 | None | $118 |
| 2019 | 3 | 4 | None | $177 |
Paid work is consulting, speaking, honoraria and royalties, as opposed to meals and travel.
A payment is not proof that care is biased.
| Thea Pharma | Iyuzeh | $18 | 1 payment
|
See the published payment
| Thea Pharma | Meals · 2025-12-12 | Iyuzeh | $18 |
See earlier years (2024, 2023, 2022, 2019)
2024: $211
| Alcon Vision | Rocklatan | $63 | 2 payments
|
| Oyster Point Pharma | Tyrvaya | $43 | 2 payments
|
| Sight Sciences | Omni Surgical System | $38 | 2 payments
|
| Glaukos | Ce-Marked Kxla System | $29 | 1 payment
|
| Tarsus Pharmaceuticals | Xdemvy | $19 | 1 payment
|
| Bausch & Lomb Americas | Miebo | $19 | 1 payment
|
2023: $22
| Alcon Vision | Rocklatan | $22 | 1 payment
|
2022: $118
| Alcon Vision | Simbrinza | $71 | 3 payments
|
| Abbvie | Restasis Multidose | $24 | 1 payment
|
| Oyster Point Pharma | Tyrvaya | $23 | 1 payment
|
2019: $177
| Alcon Vision | Acrysof | $151 | 2 payments
|
| Shire North American Group | Xiidra | $14 | 1 payment
|
| Novartis Pharmaceuticals | Pazeo | $12 | 1 payment
|
Professional record
- NPI
- 1366852865
- Licence
- PA MD464155
- Trained
- Howard University College of Medicine, 2014 · 12 years ago
- Gender
- Female
More record details
- Sole proprietor
- No
- Taxonomy
- Federal specialty code 207W00000X (207W00000X)
- Mailing address
- 20046 Lake Chabot Rd, Castro Valley, CA, 94546
- NPI first listed
- 2014-05-06
- NPI last updated
- 2025-11-21
- NPI record certified
- 2025-11-21
This is when the NPI record was last certified, not a medical board exam.