David Y Tsai, MD | UniHealth

Offices

3 locations · Sutter Bay Medical Foundation · 3,783 clinicians in this group

Looking this up.

Hospitals listed: El Camino Health. That is not proof they admit you there this week.

Plans that list them

1 plan · 1 carrier

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

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Plans whose provider directory lists this clinician

DualConnect (HMO D-SNP)	Santa Clara Family Health Plan	Listed	Sep 1, 2026

California Medical Board record

Licence A120477 · Current

Licensed to practise in California · since 2012 · expires 2028-02-29 · Tufts University School of Medicine.

No disciplinary actions, convictions, malpractice judgments or citations in this record.

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.

El Camino HealthMountain View, CAAcute Care Hospital · Government - Hospital District or Authority · Has an emergency department · Birthing-friendlyPart of El Camino Health, which runs 2 hospitalsPatients rate it 4 of 5 · 80% would definitely recommend it
Overall rating: 4 of 5 starsBetter than the national rate — Central Line Associated Bloodstream Infection (ICU + select Wards): 0.291, Oct 2024 – Sep 2025Better than the national rate — Clostridium Difficile (C.Diff): 0.393, Oct 2024 – Sep 2025Better than the national rate — MRSA Bacteremia: 0, Oct 2024 – Sep 2025

See every measure and the patient survey for El Camino Health

Behind the star rating — Deaths: 3 better, 5 the same, 0 worse of 8 measures. Safety: 3 better, 5 the same, 0 worse of 8 measures. Readmissions: 1 better, 9 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 El Camino Health

Central Line Associated Bloodstream Infection (ICU + select Wards)Infections	0.291	Better	Oct 2024 – Sep 2025
Clostridium Difficile (C.Diff)Infections	0.393	Better	Oct 2024 – Sep 2025
MRSA BacteremiaInfections	0	Better	Oct 2024 – Sep 2025
Abdominopelvic accidental puncture or laceration rateComplications and deaths	0.96 (0.12 to 1.79) · 2,340 cases	No different	Jul 2022 – Jun 2024
CMS Medicare PSI 90: Patient safety and adverse events compositeComplications and deaths	1.02 (0.76 to 1.28)	No different	Jul 2022 – Jun 2024
Death rate among surgical inpatients with serious treatable complicationsComplications and deaths	167.38 (125.03 to 209.73) · 96 cases	No different	Jul 2022 – Jun 2024
Death rate for CABG surgery patientsComplications and deaths	2.6 · 68 cases	None	Jul 2022 – Jun 2025
Death rate for COPD patientsComplications and deaths	7.1 · 185 cases	None	Jul 2022 – Jun 2025
Death rate for heart attack patientsComplications and deaths	11.8 · 200 cases	None	Jul 2022 – Jun 2025
Death rate for heart failure patientsComplications and deaths	8.9 · 814 cases	None	Jul 2022 – Jun 2025
Death rate for pneumonia patientsComplications and deaths	13 · 842 cases	None	Jul 2022 – Jun 2025
Death rate for stroke patientsComplications and deaths	9.6 · 361 cases	None	Jul 2023 – Jun 2025
Hybrid Hospital-Wide All-Cause Risk Standardized Mortality RateComplications and deaths	2.6 · 4,633 cases	None	Jul 2024 – Jun 2025
Iatrogenic pneumothorax rateComplications and deaths	0.16 (0 to 0.34) · 11,474 cases	No different	Jul 2022 – Jun 2024
In-hospital fall-associated fracture rateComplications and deaths	0.27 (0.1 to 0.45) · 11,626 cases	No different	Jul 2022 – Jun 2024
Perioperative pulmonary embolism or deep vein thrombosis rateComplications and deaths	3.14 (1.39 to 4.9) · 2,814 cases	No different	Jul 2022 – Jun 2024
Postoperative acute kidney injury requiring dialysis rateComplications and deaths	2 (0.61 to 3.39) · 1,327 cases	No different	Jul 2022 – Jun 2024
Postoperative hemorrhage or hematoma rateComplications and deaths	2.11 (0.8 to 3.43) · 2,641 cases	No different	Jul 2022 – Jun 2024
Postoperative respiratory failure rateComplications and deaths	9.39 (4.18 to 14.6) · 1,287 cases	No different	Jul 2022 – Jun 2024
Postoperative sepsis rateComplications and deaths	6.57 (3.47 to 9.68) · 1,308 cases	No different	Jul 2022 – Jun 2024
Postoperative wound dehiscence rateComplications and deaths	2.14 (0.71 to 3.57) · 827 cases	No different	Jul 2022 – Jun 2024
Pressure ulcer rateComplications and deaths	0.6 (0.05 to 1.15) · 9,460 cases	No different	Jul 2022 – Jun 2024
Rate of complications for hip/knee replacement patientsComplications and deaths	4.5 · 122 cases	None	Apr 2023 – Mar 2025
Catheter Associated Urinary Tract Infections (ICU + select Wards)Infections	0.993	No different	Oct 2024 – Sep 2025
SSI - Abdominal HysterectomyInfections	0.706	No different	Oct 2024 – Sep 2025
SSI - Colon SurgeryInfections	1.376	No different	Oct 2024 – Sep 2025
Acute Myocardial Infarction (AMI) 30-Day Readmission RateUnplanned return visits	15.5 · 218 cases	None	Jul 2023 – Jun 2025
Heart failure (HF) 30-Day Readmission RateUnplanned return visits	19.5 · 962 cases	None	Jul 2023 – Jun 2025
Hospital return days for heart attack patientsUnplanned return visits	3.8 · 200 cases	None	Jul 2022 – Jun 2025
Hospital return days for heart failure patientsUnplanned return visits	-17 · 922 cases	None	Jul 2022 – Jun 2025
Hospital return days for pneumonia patientsUnplanned return visits	18.6 · 860 cases	None	Jul 2022 – Jun 2025
Pneumonia (PN) 30-Day Readmission RateUnplanned return visits	18.7 · 827 cases	None	Jul 2023 – Jun 2025
Rate of emergency department (ED) visits for patients receiving outpatient chemotherapyUnplanned return visits	6.1 (4.5 to 8.2) · 313 cases	No different	Jan 2024 – Dec 2024
Rate of inpatient admissions for patients receiving outpatient chemotherapyUnplanned return visits	13.4 (10.6 to 16.5) · 313 cases	No different	Jan 2024 – Dec 2024
Rate of readmission after hip/knee replacementUnplanned return visits	6.1 · 144 cases	None	Jul 2023 – Jun 2025
Rate of readmission for CABGUnplanned return visits	10.3 · 80 cases	None	Jul 2023 – Jun 2025
Rate of readmission for chronic obstructive pulmonary disease (COPD) patientsUnplanned return visits	20.7 · 237 cases	None	Jul 2023 – Jun 2025
Rate of unplanned hospital visits after colonoscopy (per 1,000 colonoscopies)Unplanned return visits	12.8 (10 to 16.1) · 1,639 cases	No different	Jan 2022 – Dec 2024
Ratio of unplanned hospital visits after hospital outpatient surgeryUnplanned return visits	0.9 (0.8 to 1.1) · 1,619 cases	No different	Jan 2024 – Dec 2024

What patients said (1,535 patients answered, 22% of those asked)

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Patient survey stars by topic at El Camino Health

Cleanliness	4
Nurse communication	4
Doctor communication	4
Communication about medicines	3
Discharge information	3
Overall hospital rating	4
Quietness	2
Recommend hospital	5

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Share of patients giving the best answer at El Camino Health

Room was "always" clean	75%
Nurses "always" communicated well	79%
Doctors "always" communicated well	81%
Staff "always" explained	61%
Yes, staff "did" give patients this information	86%
Yes, staff "did" give patients information about help after discharge	86%
Doctors "always" explained things so they could understand	76%
Doctors "always" listened carefully	80%
Doctors "always" treated them with courtesy and respect	87%
Patients who gave a rating of "9" or "10" (high)	76%
Staff "always" explained new medications	76%
Nurses "always" explained things so they could understand	75%
Nurses "always" listened carefully	76%
Nurses "always" treated them with courtesy and respect	87%
"Always" quiet at night	47%
"YES", patients would definitely recommend the hospital	80%
Staff "always" explained possible side effects	46%
Yes, staff "did" give patients information about possible symptoms	86%

Original Medicare doctor bills

$84,018

Medicare paid this office $84,018 for 287 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 50 minutes	121	$34,289	$105
Subsequent hospital care with moderate levelof medical decision making at least 35 minutes	142	$22,084	$67
Hospital discharge day management, more than 30 minutes	162	$17,553	$100
Initial hospital care with moderate level of medical decision making at least 75 minutes	61	$8,894	$146

Who their Medicare patients are

287 Original Medicare patients in 2024. Average age 82 · 85 and older 41% · Women 54% · Also on Medicaid 22% · Health risk score 2.14. At or below the middle of the specialty; the typical hospitalist clinician is at 2.49.

Conditions among them: High blood pressure 75% · Chronic kidney disease 49% · Coronary heart disease 45% · Diabetes 44% · Heart failure 41% · Atrial fibrillation 38% · Depression 30% · Dementia 30% · Cancer 24% · Stroke 24% · COPD 23%.

The office billed $316,646, Medicare allowed $109,358 and paid $84,018; for 906 services of 7 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	287	906	82	2.14	$316,646	$84,018
2023	329	870	80	1.86	$321,466	$86,990
2022	301	962	81	2.01	$358,865	$94,439
2021	297	804	81	2.02	$287,663	$77,851
2020	252	814	80	2.11	$250,546	$76,768
2019	328	1,076	80	2.27	$326,005	$98,757
2018	309	953	80	2.29	$279,251	$84,502
2017	315	964	81	2.22	$285,777	$89,704
2016	258	852	78	2.06	$241,364	$76,001
2015	286	1,031	81	2.12	$294,528	$98,574
2014	268	946	80	1.94	$272,648	$84,152
2013	71	266	81	2.03	$67,898	$19,934

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

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Original Medicare services billed in 2023

Subsequent hospital care with moderate levelof medical decision making at least 50 minutes	132	$36,890	$109
Hospital discharge day management, more than 30 minutes	165	$18,060	$102
Subsequent hospital care with moderate levelof medical decision making at least 35 minutes	130	$17,161	$70
Initial hospital care with moderate level of medical decision making at least 75 minutes	80	$12,236	$149
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes	15	$1,707	$114

2022: 6 services

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Original Medicare services billed in 2022

Subsequent hospital care with moderate levelof medical decision making at least 50 minutes	174	$51,927	$95
Hospital discharge day management, more than 30 minutes	147	$15,783	$96
Initial hospital care with moderate level of medical decision making at least 75 minutes	67	$12,111	$178
Subsequent hospital care with moderate levelof medical decision making at least 35 minutes	81	$7,932	$64
Initial hospital observation care per day, typically 70 minutes	22	$3,571	$162
Hospital observation care on day of discharge	21	$1,224	$56

2021: 6 services

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Original Medicare services billed in 2021

Subsequent hospital care with moderate levelof medical decision making at least 50 minutes	114	$28,731	$93
Hospital discharge day management, more than 30 minutes	136	$14,786	$98
Initial hospital care with moderate level of medical decision making at least 75 minutes	73	$13,100	$179
Subsequent hospital care with moderate levelof medical decision making at least 35 minutes	106	$12,731	$64
Initial hospital observation care per day, typically 70 minutes	28	$4,698	$168
Hospital observation care on day of discharge	23	$1,564	$68

2020: 6 services

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Original Medicare services billed in 2020

Subsequent hospital care with moderate levelof medical decision making at least 50 minutes	121	$32,174	$96
Subsequent hospital care with moderate levelof medical decision making at least 35 minutes	96	$15,910	$67
Hospital discharge day management, more than 30 minutes	110	$12,087	$101
Initial hospital care with moderate level of medical decision making at least 75 minutes	57	$10,484	$184
Initial hospital observation care per day, typically 70 minutes	21	$3,055	$145
Hospital observation care on day of discharge	17	$1,098	$65

2019: 7 services

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Original Medicare services billed in 2019

Subsequent hospital care with moderate levelof medical decision making at least 50 minutes	154	$40,428	$94
Subsequent hospital care with moderate levelof medical decision making at least 35 minutes	145	$21,080	$65
Hospital discharge day management, more than 30 minutes	144	$15,561	$99
Initial hospital care with moderate level of medical decision making at least 75 minutes	70	$13,267	$184
Initial hospital observation care per day, typically 70 minutes	17	$2,875	$169
Hospital observation care on day of discharge	33	$2,238	$68
Follow-up observation care per day, typically 25 minutes	15	$1,400	$67

2018: 7 services

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Original Medicare services billed in 2018

Subsequent hospital care with moderate levelof medical decision making at least 50 minutes	146	$32,299	$93
Subsequent hospital care with moderate levelof medical decision making at least 35 minutes	148	$20,197	$64
Hospital discharge day management, more than 30 minutes	142	$14,594	$97
Initial hospital care with moderate level of medical decision making at least 75 minutes	60	$10,516	$172
Initial hospital observation care per day, typically 70 minutes	16	$2,636	$165
Hospital observation care on day of discharge	26	$1,672	$64
Follow-up observation care per day, typically 25 minutes	18	$1,584	$66

2017: 7 services

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Original Medicare services billed in 2017

Subsequent hospital care with moderate levelof medical decision making at least 50 minutes	131	$24,492	$93
Subsequent hospital care with moderate levelof medical decision making at least 35 minutes	146	$22,927	$64
Initial hospital care with moderate level of medical decision making at least 75 minutes	97	$17,943	$179
Hospital discharge day management, more than 30 minutes	128	$13,452	$98
Initial hospital observation care per day, typically 70 minutes	37	$6,021	$163
Follow-up observation care per day, typically 25 minutes	13	$2,097	$66
Hospital observation care on day of discharge	29	$1,868	$64

2016: 7 services

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Original Medicare services billed in 2016

Subsequent hospital care with moderate levelof medical decision making at least 35 minutes	132	$21,894	$64
Subsequent hospital care with moderate levelof medical decision making at least 50 minutes	89	$21,759	$93
Initial hospital care with moderate level of medical decision making at least 75 minutes	72	$12,776	$175
Hospital discharge day management, more than 30 minutes	112	$11,698	$97
Initial hospital observation care per day, typically 70 minutes	24	$3,774	$157
Hospital observation care on day of discharge	21	$1,383	$66
Follow-up observation care per day, typically 25 minutes	16	$1,301	$65

2015: 7 services

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Original Medicare services billed in 2015

Subsequent hospital care with moderate levelof medical decision making at least 35 minutes	151	$32,791	$68
Initial hospital care with moderate level of medical decision making at least 75 minutes	118	$22,725	$189
Subsequent hospital care with moderate levelof medical decision making at least 50 minutes	65	$21,536	$97
Hospital discharge day management, more than 30 minutes	117	$12,216	$102
Initial hospital observation care per day, typically 70 minutes	26	$4,528	$174
Follow-up observation care per day, typically 25 minutes	16	$1,979	$68
Hospital observation care on day of discharge	18	$1,245	$69

2014: 7 services

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Original Medicare services billed in 2014

Subsequent hospital care with moderate levelof medical decision making at least 35 minutes	164	$27,413	$64
Initial hospital care with moderate level of medical decision making at least 75 minutes	87	$16,299	$179
Subsequent hospital care with moderate levelof medical decision making at least 50 minutes	81	$15,711	$92
Hospital discharge day management, more than 30 minutes	138	$14,288	$97
Initial hospital observation care per day, typically 70 minutes	15	$2,428	$162
Follow-up observation care per day, typically 25 minutes	18	$2,005	$65
Hospital observation care on day of discharge	23	$1,500	$65

2013: 2 services

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Original Medicare services billed in 2013

Subsequent hospital care with moderate levelof medical decision making at least 35 minutes	45	$10,304	$62
Hospital discharge day management, more than 30 minutes	42	$3,990	$93

Drugs they prescribed that Part D paid

$23,594

Pharmacies billed $23,594 in 2024.

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

Opioids were 7% of their Part D prescriptions (29 of 396) in 2024. Above the middle of the specialty; the typical hospitalist clinician is at 4%.

360 generic and 36 brand-name prescriptions · $23,594 in drug cost · 55 antibiotic prescriptions to 41 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

Pantoprazole	31	$230	$7
Ondansetron Odt	16	$174	$11
Metoprolol	12	$149	$12
Hydrocodone-Acetaminophen	11	$89	$8
Atorvastatin	14	$84	$6

See all 10 drugs

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Every Part D drug this clinician prescribed

Pantoprazole	31	$230	$7
Ondansetron Odt	16	$174	$11
Metoprolol	12	$149	$12
Hydrocodone-Acetaminophen	11	$89	$8
Atorvastatin	14	$84	$6
Ciprofloxacin	18	$60	$3
Prednisone	13	$50	$4
Furosemide	13	$50	$4
Clopidogrel	12	$42	$4
Spironolactone	11	$15	$1

Year by year

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Part D prescribing by year

2024	396	131	7% (29)	9%	$23,594
2023	284	126	8% (23)	None	$11,156
2022	241	115	7% (16)	None	$9,773
2021	302	121	9% (26)	15%	$16,607
2020	280	103	8% (22)	None	$11,409
2019	227	96	6% (14)	None	$11,085
2018	207	91	9% (19)	None	$9,786
2017	268	80	7% (18)	18%	$19,248
2016	206	74	10% (20)	None	$14,102
2015	235	80	8% (19)	18%	$10,538
2014	214	81	12% (25)	21%	$13,348
2013	511	54	5% (23)	15%	$16,929

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

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Part D drugs prescribed in 2023

Pantoprazole	12	$197	$16
Amoxicillin-Clavulanate Potass	12	$94	$8

2022: 5 drugs

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Part D drugs prescribed in 2022

Pantoprazole	11	$127	$12
Atorvastatin	11	$86	$8
Amlodipine Besylate	17	$83	$5
Hydrocodone-Acetaminophen	11	$78	$7
Ciprofloxacin	15	$74	$5

2021: 6 drugs

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Part D drugs prescribed in 2021

Eliquis	14	$7,396	$528
Pantoprazole	22	$280	$13
Ciprofloxacin	14	$110	$8
Hydrocodone-Acetaminophen	11	$96	$9
Furosemide	15	$63	$4
Prednisone	11	$53	$5

2020: 5 drugs

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Part D drugs prescribed in 2020

Hydrocodone-Acetaminophen	18	$199	$11
Pantoprazole	14	$111	$8
Atorvastatin	12	$83	$7
Furosemide	11	$41	$4
Ciprofloxacin	11	$41	$4

2019: 2 drugs

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Part D drugs prescribed in 2019

Atorvastatin	16	$145	$9
Furosemide	16	$53	$3

2018: 5 drugs

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Part D drugs prescribed in 2018

Eliquis	11	$3,930	$357
Pantoprazole	14	$153	$11
Hydrocodone-Acetaminophen	11	$113	$10
Ciprofloxacin	13	$82	$6
Prednisone	17	$80	$5

2017: 4 drugs

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Part D drugs prescribed in 2017

Pantoprazole	25	$275	$11
Atorvastatin	18	$162	$9
Clopidogrel	19	$103	$5
Furosemide	19	$58	$3

2016: 3 drugs

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Part D drugs prescribed in 2016

Hydrocodone-Acetaminophen	11	$112	$10
Ciprofloxacin	12	$70	$6
Furosemide	13	$48	$4

2015: 2 drugs

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Part D drugs prescribed in 2015

Pantoprazole	15	$204	$14
Atorvastatin	12	$118	$10

2014: 3 drugs

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Part D drugs prescribed in 2014

Levofloxacin	14	$201	$14
Hydrocodone-Acetaminophen	12	$138	$12
Furosemide	20	$61	$3

2013: 16 drugs

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Part D drugs prescribed in 2013

Clopidogrel	13	$1,189	$91
Atorvastatin	28	$1,054	$38
Benazepril	32	$365	$11
Metformin	29	$320	$11
Carvedilol	20	$297	$15
Levothyroxine	23	$260	$11
Amlodipine Besylate	24	$246	$10
Omeprazole	17	$245	$14
Losartan	25	$207	$8
Metoprolol	25	$191	$8
Simvastatin	18	$163	$9
Tramadol	14	$153	$11
Furosemide	28	$152	$5
Alendronate	13	$136	$10
Hydrochlorothiazide	28	$114	$4
Spironolactone	11	$78	$7

Money from drug and device companies

$26 in 2024

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Industry payments by year

2024	1	1	None	$26
2023	1	1	None	$20
2019	1	1	None	$20

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

A payment is not proof that care is biased.

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Payments by company

ACADIA Pharmaceuticals	Daybue	$26	1 payment Meals for Daybue · 2024-10-07 · $26

See the published payment

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Every published payment

ACADIA Pharmaceuticals	Meals · 2024-10-07	Daybue	$26

See earlier years (2023, 2019)

2023: $20

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Payments by company in 2023

Ucb	Fintepla	$20	1 payment Meals for Fintepla · 2023-09-01 · $20

2019: $20

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Payments by company in 2019

Mallinckrodt Enterprises	Ofirmev	$20	1 payment Meals for Ofirmev · 2019-08-12 · $20

Professional record

NPI: 1053683334
Licence: CA A120477California A120477: Current · expires 2028-02-29
Trained: Tufts University School of Medicine, 2009
Group: Sutter Bay Medical Foundation
Gender: Male

More record details

Sole proprietor: No
Taxonomy: Hospitalist (208M00000X)
Mailing address: 325 Distel Cir, Los Altos, CA, 94022
NPI first listed: 2012-02-02
NPI last updated: 2021-02-25
NPI record certified: 2021-02-25

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