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Siavash Assar, OD

Optometry · Berkeley

NPI 1699298224

Medicare standing
Clear
Enrolled, allowed to bill and order, not excluded
Plans that list them
3
1 carrier
Offices
4
Since medical school
9 years
Graduated 2017

Offices

4 locations · UCSF Medical Group Business Services · University of California San Francisco

Looking this up.

Hospitals listed: UCSF Medical Center. That is not proof they admit you there this week.

Plans that list them

3 plans · 1 carrier

A missing listing does not mean out of network. Directories change, and a listing does not cover every office. Call Dr. Assar’s office to confirm they take your plan. Ask about the office you use, its medical group, referrals and appointments.

Plans whose provider directory lists this clinician
Imperial Courage Plan (HMO)Imperial Health Plan of California, Inc.ListedSep 1, 2026
Imperial Dynamic Plan (HMO)Imperial Health Plan of California, Inc.ListedSep 1, 2026
Imperial Senior Value (HMO C-SNP)Imperial Health Plan of California, Inc.ListedSep 1, 2026

Hospitals they work in

1 hospital

These rate the hospital, not this clinician. Most measures at most hospitals are no different from the national rate.

  • UCSF Medical CenterSan Francisco, CAAcute Care Hospital · Voluntary non-profit - Other · Has an emergency department · Birthing-friendlyPart of University of California Health, which runs 12 hospitalsHome of UCSF Helen Diller Family Comprehensive Cancer Center, a National Cancer Institute designated comprehensive cancer centrePatients rate it 4 of 5 · 81% would definitely recommend it
    Overall rating: 4 of 5 starsWorse than the national rate — Perioperative pulmonary embolism or deep vein thrombosis rate: 4.9 (3.79 to 6.02) · 7,590 cases, Jul 2022 – Jun 2024Worse than the national rate — Rate of inpatient admissions for patients receiving outpatient chemotherapy: 12.8 (11.3 to 14.4) · 2,019 cases, Jan 2024 – Dec 2024Better than the national rate — Death rate among surgical inpatients with serious treatable complications: 139.4 (110.22 to 168.58) · 452 cases, Jul 2022 – Jun 2024Better than the national rate — Central Line Associated Bloodstream Infection (ICU + select Wards): 0.622, Oct 2024 – Sep 2025Better than the national rate — Clostridium Difficile (C.Diff): 0.626, Oct 2024 – Sep 2025Better than the national rate — MRSA Bacteremia: 0.491, Oct 2024 – Sep 2025Better than the national rate — Ratio of unplanned hospital visits after hospital outpatient surgery: 0.8 (0.7 to 1) · 2,336 cases, Jan 2024 – Dec 2024
See every measure and the patient survey for UCSF Medical Center

Behind the star rating — Deaths: 5 better, 3 the same, 0 worse of 8 measures. Safety: 3 better, 5 the same, 0 worse of 8 measures. Readmissions: 3 better, 5 the same, 3 worse of 11 measures. The star rating is worked out from an earlier period than the measures below, so the two can disagree.

Every scored measure at UCSF Medical Center
Perioperative pulmonary embolism or deep vein thrombosis rateComplications and deaths4.9 (3.79 to 6.02) · 7,590 casesWorseJul 2022 – Jun 2024
Rate of inpatient admissions for patients receiving outpatient chemotherapyUnplanned return visits12.8 (11.3 to 14.4) · 2,019 casesWorseJan 2024 – Dec 2024
Death rate among surgical inpatients with serious treatable complicationsComplications and deaths139.4 (110.22 to 168.58) · 452 casesBetterJul 2022 – Jun 2024
Central Line Associated Bloodstream Infection (ICU + select Wards)Infections0.622BetterOct 2024 – Sep 2025
Clostridium Difficile (C.Diff)Infections0.626BetterOct 2024 – Sep 2025
MRSA BacteremiaInfections0.491BetterOct 2024 – Sep 2025
Ratio of unplanned hospital visits after hospital outpatient surgeryUnplanned return visits0.8 (0.7 to 1) · 2,336 casesBetterJan 2024 – Dec 2024
Abdominopelvic accidental puncture or laceration rateComplications and deaths1.24 (0.58 to 1.9) · 4,689 casesNo differentJul 2022 – Jun 2024
CMS Medicare PSI 90: Patient safety and adverse events compositeComplications and deaths1.05 (0.89 to 1.2)No differentJul 2022 – Jun 2024
Death rate for CABG surgery patientsComplications and deaths1.9 · 89 casesNoneJul 2022 – Jun 2025
Death rate for COPD patientsComplications and deaths7.5 · 85 casesNoneJul 2022 – Jun 2025
Death rate for heart attack patientsComplications and deaths10.1 · 132 casesNoneJul 2022 – Jun 2025
Death rate for heart failure patientsComplications and deaths6.6 · 454 casesNoneJul 2022 – Jun 2025
Death rate for pneumonia patientsComplications and deaths10.3 · 618 casesNoneJul 2022 – Jun 2025
Death rate for stroke patientsComplications and deaths9.6 · 380 casesNoneJul 2023 – Jun 2025
Hybrid Hospital-Wide All-Cause Risk Standardized Mortality RateComplications and deaths2.7 · 5,000 casesNoneJul 2024 – Jun 2025
Iatrogenic pneumothorax rateComplications and deaths0.22 (0.06 to 0.38) · 15,965 casesNo differentJul 2022 – Jun 2024
In-hospital fall-associated fracture rateComplications and deaths0.2 (0.05 to 0.35) · 17,859 casesNo differentJul 2022 – Jun 2024
Postoperative acute kidney injury requiring dialysis rateComplications and deaths0.85 (0 to 1.83) · 4,184 casesNo differentJul 2022 – Jun 2024
Postoperative hemorrhage or hematoma rateComplications and deaths2 (1.1 to 2.9) · 6,516 casesNo differentJul 2022 – Jun 2024
Postoperative respiratory failure rateComplications and deaths7.35 (4.49 to 10.21) · 3,989 casesNo differentJul 2022 – Jun 2024
Postoperative sepsis rateComplications and deaths5 (3.22 to 6.77) · 4,087 casesNo differentJul 2022 – Jun 2024
Postoperative wound dehiscence rateComplications and deaths1.95 (0.74 to 3.15) · 2,034 casesNo differentJul 2022 – Jun 2024
Pressure ulcer rateComplications and deaths0.95 (0.63 to 1.28) · 15,431 casesNo differentJul 2022 – Jun 2024
Rate of complications for hip/knee replacement patientsComplications and deaths4 · 399 casesNoneApr 2023 – Mar 2025
Catheter Associated Urinary Tract Infections (ICU + select Wards)Infections0.899No differentOct 2024 – Sep 2025
SSI - Abdominal HysterectomyInfections0.689No differentOct 2024 – Sep 2025
SSI - Colon SurgeryInfections1.224No differentOct 2024 – Sep 2025
Acute Myocardial Infarction (AMI) 30-Day Readmission RateUnplanned return visits16 · 156 casesNoneJul 2023 – Jun 2025
Heart failure (HF) 30-Day Readmission RateUnplanned return visits20 · 564 casesNoneJul 2023 – Jun 2025
Hospital return days for heart attack patientsUnplanned return visits60.3 · 160 casesNoneJul 2022 – Jun 2025
Hospital return days for heart failure patientsUnplanned return visits-9.7 · 550 casesNoneJul 2022 – Jun 2025
Hospital return days for pneumonia patientsUnplanned return visits44.1 · 660 casesNoneJul 2022 – Jun 2025
Pneumonia (PN) 30-Day Readmission RateUnplanned return visits16.8 · 667 casesNoneJul 2023 – Jun 2025
Rate of emergency department (ED) visits for patients receiving outpatient chemotherapyUnplanned return visits5.7 (4.8 to 6.7) · 2,019 casesNo differentJan 2024 – Dec 2024
Rate of readmission after hip/knee replacementUnplanned return visits6 · 421 casesNoneJul 2023 – Jun 2025
Rate of readmission for CABGUnplanned return visits10.5 · 53 casesNoneJul 2023 – Jun 2025
Rate of readmission for chronic obstructive pulmonary disease (COPD) patientsUnplanned return visits20 · 107 casesNoneJul 2023 – Jun 2025
Rate of unplanned hospital visits after colonoscopy (per 1,000 colonoscopies)Unplanned return visits13.9 (11.3 to 17.1) · 3,247 casesNo differentJan 2022 – Dec 2024

What patients said (3,181 patients answered, 25% of those asked)

Patient survey stars by topic at UCSF Medical Center
Cleanliness4
Nurse communication4
Doctor communication4
Communication about medicines3
Discharge information4
Overall hospital rating4
Quietness2
Recommend hospital5
Share of patients giving the best answer at UCSF Medical Center
Room was "always" clean71%
Nurses "always" communicated well80%
Doctors "always" communicated well80%
Staff "always" explained61%
Yes, staff "did" give patients this information88%
Yes, staff "did" give patients information about help after discharge87%
Doctors "always" explained things so they could understand74%
Doctors "always" listened carefully78%
Doctors "always" treated them with courtesy and respect86%
Patients who gave a rating of "9" or "10" (high)76%
Staff "always" explained new medications75%
Nurses "always" explained things so they could understand77%
Nurses "always" listened carefully78%
Nurses "always" treated them with courtesy and respect86%
"Always" quiet at night50%
"YES", patients would definitely recommend the hospital81%
Staff "always" explained possible side effects46%
Yes, staff "did" give patients information about possible symptoms90%

Original Medicare doctor bills

$31,314

Medicare paid this office $31,314 for 318 people.

This is what Medicare paid the clinician — not Medicare Advantage, and not the pharmacy.

Largest Original Medicare bills
Short return visit (20+ min)79$4,910$58
New patient visit (45+ min)37$4,189$113
Return visit (30+ min)44$4,107$87
Return visit (30+ min)45$3,450$77
New patient visit (30+ min)41$2,916$71
See all 16 services
Every Original Medicare service billed
Short return visit (20+ min)79$4,910$58
New patient visit (45+ min)37$4,189$113
Return visit (30+ min)44$4,107$87
Return visit (30+ min)45$3,450$77
New patient visit (30+ min)41$2,916$71
Short return visit (20+ min)28$2,433$59
New patient visit (45+ min)12$1,412$118
New patient visit (30+ min)14$1,222$87
Imaging of retina45$1,082$23
Exam of visual field with extended testing19$496$25
Imaging of retina16$416$26
Imaging of optic nerve22$414$19
Imaging of optic nerve15$412$27
Photography of the retina14$408$29
Exam of the internal drainage system of eye12$226$19
Ultrasound scan of cornea to determine thickness13$99$7

Who their Medicare patients are

318 Original Medicare patients in 2024. Average age 74 · Under 65 8% · 85 and older 11% · Women 61% · Also on Medicaid 30% · Health risk score 1.26. Above the middle of the specialty; the typical optometry clinician is at 0.97.

Conditions among them: High blood pressure 64% · Diabetes 30% · Coronary heart disease 22% · Chronic kidney disease 19% · Depression 19% · Atrial fibrillation 16% · Cancer 15% · Heart failure 13% · COPD 10% · Dementia 7% · Stroke 7%.

The office billed $207,312, Medicare allowed $45,972 and paid $31,314; for 555 services of 25 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

Original Medicare by year
2024318555741.26$207,312$31,314
2023309612750.87$198,675$47,604
2022197384750.79$122,841$28,791
2021222425750.84$136,358$34,878
2020115211730.79$64,694$16,920

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: 9 services

Original Medicare services billed in 2023
Return visit (30+ min)118$12,744$100
New patient visit (45+ min)93$11,588$125
Short return visit (20+ min)94$11,454$81
New patient visit (30+ min)41$3,779$92
Photography of the retina50$1,715$34
Imaging of optic nerve49$1,653$33
Imaging of retina35$1,352$39
Exam of visual field with extended testing17$1,118$62
Exam of the internal drainage system of eye15$291$19

2022: 7 services

Original Medicare services billed in 2022
New patient visit (45+ min)58$7,861$136
Return visit (30+ min)71$7,419$99
Short return visit (20+ min)55$5,401$72
New patient visit (30+ min)28$2,679$96
Photography of the retina37$1,420$35
Imaging of retina25$926$36
Imaging of optic nerve19$660$35

2021: 9 services

Original Medicare services billed in 2021
New patient complete exam of visual system69$8,741$127
Short return visit (20+ min)66$6,885$77
Established patient complete exam of visual system45$5,053$112
Return visit (30+ min)33$3,833$106
New patient visit (30+ min)35$3,199$91
New patient visit (45+ min)15$1,877$125
Photography of the retina42$1,621$38
Imaging of retina32$1,249$39
Imaging of optic nerve22$803$36

2020: 7 services

Original Medicare services billed in 2020
New patient complete exam of visual system46$6,085$132
Short return visit (20+ min)24$2,242$68
Return visit (30+ min)12$1,560$104
New patient visit (30+ min)17$1,555$91
Established patient complete exam of visual system16$1,319$82
Imaging of retina16$619$34
Imaging of optic nerve16$555$35

Medicaid work

$154 in 2023

Medicaid paid $154 for 12 billed services this clinician did in 2023, up to 12 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.

Largest Medicaid services in 2023
DETERMINATION REFRACTIVE STATE12$154
Medicaid work by year
202312112$154
202213113$168
2019224237$36,321
See the largest Medicaid services in earlier years

2022

Largest Medicaid services in 2022
DETERMINATION REFRACTIVE STATE13$168

2019

Largest Medicaid services in 2019
Clinic visit/encounter, all-inclusive124$33,133
FUNDUS PHOTOGRAPHY W/INTERPRETATION & REPORT100$3,187

Drugs they prescribed that Part D paid

$15,476

Pharmacies billed $15,476 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 58) in 2024. At or below the middle of the specialty; the typical optometry clinician is at 0%.

25 generic and 33 brand-name prescriptions · $15,476 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.

Largest Part D drug costs
Prednisolone Acetate12$633$53

Year by year

Part D prescribing by year
202458310% (0)57%$15,476
202375440% (0)56%$22,307
202262310% (0)63%$8,337
202159270% (0)73%$9,533
202053220% (0)49%$4,509
201935130% (0)66%$1,781

Part D prescriptions only. A drug prescribed to fewer than 11 people in a year is hidden.

See the drugs prescribed each year

2023: 2 drugs

Part D drugs prescribed in 2023
Neomycin-Polymyxin-Dexameth12$203$17
Erythromycin15$155$10

2022: 1 drug

Part D drugs prescribed in 2022
Latanoprost23$407$18

2021: 1 drug

Part D drugs prescribed in 2021
Latanoprost25$331$13

2020: 1 drug

Part D drugs prescribed in 2020
Latanoprost21$801$38

2019: 1 drug

Part D drugs prescribed in 2019
Latanoprost19$292$15

Money from drug and device companies

$68 in 2023

Industry payments by year
202311None$68
2019312$300$331

Paid work is consulting, speaking, honoraria and royalties, as opposed to meals and travel.

A payment is not proof that care is biased.

Payments by company
Dompe USOxervate$68
1 payment
  • Meals for Oxervate · 2023-06-08 · $68
See the published payment
Every published payment
Dompe USMeals · 2023-06-08Oxervate$68
See earlier years (2019)

2019: $331

Payments by company in 2019
Johnson & Johnson Vision CareAcuvue$110
4 payments
  • Consulting for Acuvue · 2019-07-16 · $50
  • Meals for Acuvue · 2019-07-16 · $5
  • Consulting for Acuvue · 2019-06-20 · $50
  • Meals for Acuvue · 2019-06-20 · $5
Alcon VisionDailies$110
4 payments
  • Meals for Dailies · 2019-07-16 · $5
  • Paid to speak or teach for Dailies · 2019-07-16 · $50
  • Meals for Air Optix · 2019-06-20 · $5
  • Paid to speak or teach for Air Optix · 2019-06-20 · $50
CooperVisionClariti Contact Lens$110
4 payments
  • Consulting for Clariti Contact Lens · 2019-07-08 · $50
  • Meals for Clariti Contact Lens · 2019-07-08 · $5
  • Consulting for Biofinity Contact Lens · 2019-06-10 · $50
  • Meals for Biofinity Contact Lens · 2019-06-10 · $5

Professional record

NPI
1699298224
Licence
PA OEG003324
Group
UCSF Medical Group Business Services · University of California San Francisco
Gender
Male
More record details
Sole proprietor
Yes
Taxonomy
Federal specialty code 152W00000X (152W00000X)
Mailing address
325 Distel Cir, Los Altos, CA, 94022
NPI first listed
2017-07-25
NPI last updated
2019-12-16
NPI record certified
2019-12-16

This is when the NPI record was last certified, not a medical board exam.

Extra NPI addresses: 820 S Damen Ave, Chicago, IL, 60612