Brian H Sun, MD | UniHealth

Offices

1 location · County of Santa Clara · 1,000 clinicians in this group

Looking this up.

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

Plans that list them

4 plans · 2 carriers

A missing listing does not mean out of network. Directories change, and a listing does not cover every office. Call Dr. Sun’s office at (408) 885-5000 to confirm they take your plan. Ask about the office you use, its medical group, referrals and appointments.

4 of 4 plans

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Plans whose provider directory lists this clinician

Anthem Full Dual Advantage Aligned (HMO D-SNP)	Anthem Blue Cross	Listed	Oct 3, 2026
Imperial Courage Plan (HMO)	Imperial Health Plan of California, Inc.	Listed	Sep 1, 2026
Imperial Dynamic Plan (HMO)	Imperial Health Plan of California, Inc.	Listed	Sep 1, 2026
Imperial Senior Value (HMO C-SNP)	Imperial Health Plan of California, Inc.	Listed	Sep 1, 2026

Checkups this office reported

Medicare did not publish checkup rates for this clinician.

Medicare’s overall office score: 80.6 / 100; Scores the office’s reporting and systems. It is not a grade for how the doctor treats you.

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.

Santa Clara Valley Medical CenterSan Jose, CAAcute Care Hospital · Government - Local · Has an emergency department · Birthing-friendlyPart of Santa Clara Valley Health and Hospital System, which runs 3 hospitalsPatients rate it 3 of 5 · 70% would definitely recommend it
Overall rating: 2 of 5 starsWorse than the national rate — SSI - Colon Surgery: 2.572, Oct 2024 – Sep 2025Better than the national rate — Central Line Associated Bloodstream Infection (ICU + select Wards): 0.563, Oct 2024 – Sep 2025Better than the national rate — Clostridium Difficile (C.Diff): 0.256, Oct 2024 – Sep 2025Better than the national rate — MRSA Bacteremia: 0.369, Oct 2024 – Sep 2025

See every measure and the patient survey for Santa Clara Valley Medical Center

Behind the star rating — Deaths: 2 better, 6 the same, 0 worse of 8 measures. Safety: 2 better, 5 the same, 1 worse of 8 measures. Readmissions: 0 better, 10 the same, 1 worse of 11 measures. The star rating is worked out from an earlier period than the measures below, so the two can disagree.

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Every scored measure at Santa Clara Valley Medical Center

SSI - Colon SurgeryInfections	2.572	Worse	Oct 2024 – Sep 2025
Central Line Associated Bloodstream Infection (ICU + select Wards)Infections	0.563	Better	Oct 2024 – Sep 2025
Clostridium Difficile (C.Diff)Infections	0.256	Better	Oct 2024 – Sep 2025
MRSA BacteremiaInfections	0.369	Better	Oct 2024 – Sep 2025
Abdominopelvic accidental puncture or laceration rateComplications and deaths	1.25 (0.3 to 2.2) · 1,535 cases	No different	Jul 2022 – Jun 2024
CMS Medicare PSI 90: Patient safety and adverse events compositeComplications and deaths	1.07 (0.76 to 1.38)	No different	Jul 2022 – Jun 2024
Death rate among surgical inpatients with serious treatable complicationsComplications and deaths	214.59 (167.38 to 261.8) · 108 cases	No different	Jul 2022 – Jun 2024
Death rate for CABG surgery patientsComplications and deaths	2.8 · 41 cases	None	Jul 2022 – Jun 2025
Death rate for COPD patientsComplications and deaths	6 · 141 cases	None	Jul 2022 – Jun 2025
Death rate for heart attack patientsComplications and deaths	10.2 · 124 cases	None	Jul 2022 – Jun 2025
Death rate for heart failure patientsComplications and deaths	8.3 · 501 cases	None	Jul 2022 – Jun 2025
Death rate for pneumonia patientsComplications and deaths	14.9 · 653 cases	None	Jul 2022 – Jun 2025
Death rate for stroke patientsComplications and deaths	10.1 · 348 cases	None	Jul 2023 – Jun 2025
Hybrid Hospital-Wide All-Cause Risk Standardized Mortality RateComplications and deaths	3 · 4,502 cases	None	Jul 2024 – Jun 2025
Iatrogenic pneumothorax rateComplications and deaths	0.24 (0.04 to 0.43) · 9,014 cases	No different	Jul 2022 – Jun 2024
In-hospital fall-associated fracture rateComplications and deaths	0.34 (0.15 to 0.52) · 9,216 cases	No different	Jul 2022 – Jun 2024
Perioperative pulmonary embolism or deep vein thrombosis rateComplications and deaths	4.54 (2.51 to 6.58) · 1,421 cases	No different	Jul 2022 – Jun 2024
Postoperative acute kidney injury requiring dialysis rateComplications and deaths	1.54 (0 to 3.2) · 288 cases	No different	Jul 2022 – Jun 2024
Postoperative hemorrhage or hematoma rateComplications and deaths	2.11 (0.66 to 3.56) · 1,446 cases	No different	Jul 2022 – Jun 2024
Postoperative respiratory failure rateComplications and deaths	11.61 (4.09 to 19.14) · 294 cases	No different	Jul 2022 – Jun 2024
Postoperative sepsis rateComplications and deaths	7.29 (3.39 to 11.2) · 299 cases	No different	Jul 2022 – Jun 2024
Postoperative wound dehiscence rateComplications and deaths	1.9 (0.45 to 3.36) · 333 cases	No different	Jul 2022 – Jun 2024
Pressure ulcer rateComplications and deaths	0.23 (0 to 0.78) · 7,538 cases	No different	Jul 2022 – Jun 2024
Rate of complications for hip/knee replacement patientsComplications and deaths	5.4 · 94 cases	None	Apr 2023 – Mar 2025
Catheter Associated Urinary Tract Infections (ICU + select Wards)Infections	0.735	No different	Oct 2024 – Sep 2025
SSI - Abdominal HysterectomyInfections	2.573	No different	Oct 2024 – Sep 2025
Acute Myocardial Infarction (AMI) 30-Day Readmission RateUnplanned return visits	14.6 · 185 cases	None	Jul 2023 – Jun 2025
Heart failure (HF) 30-Day Readmission RateUnplanned return visits	22.1 · 951 cases	None	Jul 2023 – Jun 2025
Hospital return days for heart attack patientsUnplanned return visits	56.3 · 128 cases	None	Jul 2022 – Jun 2025
Hospital return days for heart failure patientsUnplanned return visits	6.4 · 644 cases	None	Jul 2022 – Jun 2025
Hospital return days for pneumonia patientsUnplanned return visits	1.3 · 699 cases	None	Jul 2022 – Jun 2025
Pneumonia (PN) 30-Day Readmission RateUnplanned return visits	16.3 · 921 cases	None	Jul 2023 – Jun 2025
Rate of emergency department (ED) visits for patients receiving outpatient chemotherapyUnplanned return visits	5.7 (3.9 to 8.1) · 226 cases	No different	Jan 2024 – Dec 2024
Rate of inpatient admissions for patients receiving outpatient chemotherapyUnplanned return visits	12.6 (9.4 to 16.5) · 226 cases	No different	Jan 2024 – Dec 2024
Rate of readmission after hip/knee replacementUnplanned return visits	5.4 · 94 cases	None	Jul 2023 – Jun 2025
Rate of readmission for CABGUnplanned return visits	11.4 · 54 cases	None	Jul 2023 – Jun 2025
Rate of readmission for chronic obstructive pulmonary disease (COPD) patientsUnplanned return visits	20.3 · 242 cases	None	Jul 2023 – Jun 2025
Rate of unplanned hospital visits after colonoscopy (per 1,000 colonoscopies)Unplanned return visits	13.2 (9.9 to 17.4) · 702 cases	No different	Jan 2022 – Dec 2024
Ratio of unplanned hospital visits after hospital outpatient surgeryUnplanned return visits	1 (0.7 to 1.4) · 195 cases	No different	Jan 2024 – Dec 2024

What patients said (4,032 patients answered, 29% of those asked)

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Patient survey stars by topic at Santa Clara Valley Medical Center

Cleanliness	3
Nurse communication	3
Doctor communication	3
Communication about medicines	3
Discharge information	2
Overall hospital rating	3
Quietness	2
Recommend hospital	4

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Share of patients giving the best answer at Santa Clara Valley Medical Center

Room was "always" clean	70%
Nurses "always" communicated well	73%
Doctors "always" communicated well	76%
Staff "always" explained	57%
Yes, staff "did" give patients this information	82%
Yes, staff "did" give patients information about help after discharge	82%
Doctors "always" explained things so they could understand	71%
Doctors "always" listened carefully	74%
Doctors "always" treated them with courtesy and respect	82%
Patients who gave a rating of "9" or "10" (high)	67%
Staff "always" explained new medications	71%
Nurses "always" explained things so they could understand	71%
Nurses "always" listened carefully	69%
Nurses "always" treated them with courtesy and respect	80%
"Always" quiet at night	43%
"YES", patients would definitely recommend the hospital	70%
Staff "always" explained possible side effects	44%
Yes, staff "did" give patients information about possible symptoms	83%

Original Medicare doctor bills

$32,683

Medicare paid this office $32,683 for 97 people.

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

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Largest Original Medicare bills

Subsequent hospital care with moderate levelof medical decision making at least 35 minutes	56	$11,771	$70
Subsequent hospital care with moderate levelof medical decision making at least 50 minutes	20	$8,555	$107
Hospital discharge day management, more than 30 minutes	51	$5,321	$102
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes	33	$3,119	$95
Initial hospital care with moderate level of medical decision making at least 75 minutes	17	$2,547	$150

See all 6 services

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Every Original Medicare service billed

Subsequent hospital care with moderate levelof medical decision making at least 35 minutes	56	$11,771	$70
Subsequent hospital care with moderate levelof medical decision making at least 50 minutes	20	$8,555	$107
Hospital discharge day management, more than 30 minutes	51	$5,321	$102
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes	33	$3,119	$95
Initial hospital care with moderate level of medical decision making at least 75 minutes	17	$2,547	$150
Subsequent hospital care with straightforward or low level of medical decision making, per day at least 25 minutes	11	$709	$44

Who their Medicare patients are

97 Original Medicare patients in 2024. Average age 75 · Under 65 21% · 85 and older 34% · Women 43% · Also on Medicaid 85% · Health risk score 3.25. Sicker patients than 9 in 10 peers; the typical internal medicine clinician is at 1.76.

Conditions among them: High blood pressure 75% · Diabetes 63% · Heart failure 56% · Coronary heart disease 52% · Chronic kidney disease 51% · Atrial fibrillation 47% · Depression 38% · Dementia 33% · Stroke 29% · COPD 25% · Cancer 14%.

The office billed $341,208, Medicare allowed $42,269 and paid $32,683; for 374 services of 9 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

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Original Medicare by year

2024	97	374	75	3.25	$341,208	$32,683
2023	132	488	70	3.18	$410,799	$43,024
2022	95	265	73	3.33	$253,515	$30,316
2021	130	436	73	3.18	$385,635	$47,412
2020	140	449	70	3.39	$395,961	$47,538
2019	164	558	72	3.65	$435,975	$57,635
2018	61	227	68	3.49	$121,886	$20,600

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: 4 services

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Original Medicare services billed in 2023

Subsequent hospital care with moderate levelof medical decision making at least 35 minutes	97	$22,417	$75
Hospital discharge day management, more than 30 minutes	68	$7,903	$110
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes	47	$5,680	$114
Initial hospital care with moderate level of medical decision making at least 75 minutes	15	$2,519	$168

2022: 5 services

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Original Medicare services billed in 2022

Subsequent hospital care with moderate levelof medical decision making at least 35 minutes	47	$7,768	$80
Subsequent hospital care with moderate levelof medical decision making at least 50 minutes	27	$7,079	$118
Initial hospital care with moderate level of medical decision making at least 75 minutes	30	$6,616	$221
Hospital discharge day management, more than 30 minutes	40	$4,779	$119
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes	15	$2,315	$154

2021: 5 services

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Original Medicare services billed in 2021

Subsequent hospital care with moderate levelof medical decision making at least 35 minutes	70	$17,272	$79
Initial hospital care with moderate level of medical decision making at least 75 minutes	51	$11,749	$218
Hospital discharge day management, more than 30 minutes	66	$7,852	$119
Subsequent hospital care with moderate levelof medical decision making at least 50 minutes	13	$3,245	$116
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes	13	$1,808	$139

2020: 7 services

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Original Medicare services billed in 2020

Subsequent hospital care with moderate levelof medical decision making at least 50 minutes	44	$11,888	$110
Initial hospital care with moderate level of medical decision making at least 75 minutes	46	$9,794	$200
Subsequent hospital care with moderate levelof medical decision making at least 35 minutes	52	$9,144	$77
Hospital discharge day management, more than 30 minutes	67	$7,711	$110
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes	22	$3,250	$141
Subsequent hospital care with straightforward or low level of medical decision making, per day at least 25 minutes	12	$1,376	$39
Hospital observation care on day of discharge	12	$875	$73

2019: 6 services

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Original Medicare services billed in 2019

Subsequent hospital care with moderate levelof medical decision making at least 50 minutes	104	$26,968	$91
Initial hospital care with moderate level of medical decision making at least 75 minutes	73	$12,659	$171
Hospital discharge day management, more than 30 minutes	78	$7,765	$97
Initial hospital observation care per day, typically 70 minutes	22	$3,673	$160
Subsequent hospital care with moderate levelof medical decision making at least 35 minutes	13	$1,756	$65
Hospital observation care on day of discharge	15	$998	$67

2018: 5 services

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Original Medicare services billed in 2018

Subsequent hospital care with moderate levelof medical decision making at least 35 minutes	22	$5,426	$65
Subsequent hospital care with moderate levelof medical decision making at least 50 minutes	25	$5,336	$94
Hospital discharge day management, more than 30 minutes	31	$3,061	$99
Initial hospital care with moderate level of medical decision making at least 75 minutes	15	$2,729	$182
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes	13	$1,589	$122

Medicaid work

$1,659 in 2024

Medicaid paid $1,659 for 297 billed services this clinician did in 2024, up to 23 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.

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Largest Medicaid services in 2024

SBSQ HOSPITAL IP/OBS CARE MOD MDM 35 MINUTES	231	$886
Hospital inpatient or observation discharge day management; more than 30 minutes on the date of the encounter	51	$517
1ST HOSPITAL IP/OBS CARE MODERATE MDM 55 MINUTES	15	$256

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Medicaid work by year

2024	297	3	23	$1,659
2023	872	3	38	$8,221
2022	235	3	21	$3,884
2021	586	4	32	$8,650
2020	388	4	26	$6,055
2019	949	3	30	$18,274
2018	370	5	34	$6,201

See the largest Medicaid services in earlier years

2023

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Largest Medicaid services in 2023

SBSQ HOSPITAL IP/OBS CARE MOD MDM 35 MINUTES	664	$5,378
Hospital inpatient or observation discharge day management; more than 30 minutes on the date of the encounter	152	$1,864
1ST HOSPITAL IP/OBS CARE MODERATE MDM 55 MINUTES	56	$979

2022

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Largest Medicaid services in 2022

SBSQ HOSPITAL IP/OBS CARE HIGH MDM 50 MINUTES	88	$1,981
SBSQ HOSPITAL IP/OBS CARE MOD MDM 35 MINUTES	133	$1,570
Hospital inpatient or observation discharge day management; more than 30 minutes on the date of the encounter	14	$334

2021

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Largest Medicaid services in 2021

SBSQ HOSPITAL IP/OBS CARE MOD MDM 35 MINUTES	377	$5,326
Hospital inpatient or observation discharge day management; more than 30 minutes on the date of the encounter	112	$1,986
1ST HOSP IP/OBS HIGH 75	68	$1,254
SBSQ HOSPITAL IP/OBS CARE HIGH MDM 50 MINUTES	29	$84

2020

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Largest Medicaid services in 2020

SBSQ HOSPITAL IP/OBS CARE HIGH MDM 50 MINUTES	119	$2,032
SBSQ HOSPITAL IP/OBS CARE MOD MDM 35 MINUTES	149	$1,877
Hospital inpatient or observation discharge day management; more than 30 minutes on the date of the encounter	69	$1,252
1ST HOSP IP/OBS HIGH 75	51	$894

2019

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Largest Medicaid services in 2019

SBSQ HOSPITAL IP/OBS CARE HIGH MDM 50 MINUTES	591	$10,157
1ST HOSP IP/OBS HIGH 75	184	$4,768
Hospital inpatient or observation discharge day management; more than 30 minutes on the date of the encounter	174	$3,348

2018

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Largest Medicaid services in 2018

SBSQ HOSPITAL IP/OBS CARE HIGH MDM 50 MINUTES	136	$2,298
SBSQ HOSPITAL IP/OBS CARE MOD MDM 35 MINUTES	125	$1,892
Hospital inpatient or observation discharge day management; more than 30 minutes on the date of the encounter	64	$1,137
1ST HOSP IP/OBS HIGH 75	27	$677
1ST HOSPITAL IP/OBS CARE MODERATE MDM 55 MINUTES	18	$198

Drugs they prescribed that Part D paid

$13,485

Pharmacies billed $13,485 in 2024.

This is pharmacy cost, not the office bill, and not what patients paid.

173 generic and fewer than 11 brand-name prescriptions · $13,485 in drug cost · 21 antibiotic prescriptions to 16 people.

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.

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Largest Part D drug costs

Levothyroxine	16	$62	$4
Atorvastatin	16	$51	$3

Year by year

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Part D prescribing by year

2024	201	65	None	None	$13,485
2023	253	80	None	None	$23,721
2022	169	46	None	None	$15,135
2021	289	73	None	None	$23,805
2020	230	61	None	None	$16,797
2019	262	77	None	None	$18,911
2018	82	31	None	21%	$6,483

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

See the drugs prescribed each year

2023: 5 drugs

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Part D drugs prescribed in 2023

Clopidogrel	11	$304	$28
Pantoprazole	18	$284	$16
Atorvastatin	19	$280	$15
Amlodipine Besylate	12	$96	$8
Furosemide	11	$60	$5

2022: 1 drug

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Part D drugs prescribed in 2022

Atorvastatin	12	$124	$10

2021: 4 drugs

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Part D drugs prescribed in 2021

Losartan	14	$122	$9
Pantoprazole	11	$120	$11
Atorvastatin	14	$115	$8
Carvedilol	11	$65	$6

2020: 4 drugs

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Part D drugs prescribed in 2020

Atorvastatin	16	$147	$9
Tamsulosin	15	$66	$4
Clopidogrel	13	$64	$5
Amlodipine Besylate	16	$37	$2

2019: 5 drugs

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Part D drugs prescribed in 2019

Atorvastatin	17	$206	$12
Pantoprazole	19	$192	$10
Tamsulosin	12	$116	$10
Furosemide	15	$97	$6
Amlodipine Besylate	12	$50	$4

Professional record

NPI: 1285029405
Trained: Saint Louis University School of Medicine, 2015 · 11 years ago
Group: County of Santa Clara
Gender: Male

More record details

Sole proprietor: No
Taxonomy: Student in a training program (390200000X)
Mailing address: 751 S Bascom Ave, San Jose, CA, 95128
NPI first listed: 2015-04-03
NPI last updated: 2015-04-03

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