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Alex Tsai, DO

Emergency Medicine · Mountain View

NPI 1114504321

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 · Cep America - California · 1,278 clinicians in this group

Looking this up.

Hospitals listed: El Camino Health · San Mateo Medical Center. That is not proof they admit you there this week.

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. Tsai’s office at (650) 940-7000 to ask if they take your plan before you enroll.

Hospitals they work in

2 hospitals

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
  • San Mateo Medical CenterSan Mateo, CAAcute Care Hospital · Government - Local · Has an emergency departmentPart of San Mateo County HealthPatients rate it 3 of 5 · 68% would definitely recommend it
    No overall ratingNo measure marked better or worse than the national rate
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.

Every scored measure at El Camino Health
Central Line Associated Bloodstream Infection (ICU + select Wards)Infections0.291BetterOct 2024 – Sep 2025
Clostridium Difficile (C.Diff)Infections0.393BetterOct 2024 – Sep 2025
MRSA BacteremiaInfections0BetterOct 2024 – Sep 2025
Abdominopelvic accidental puncture or laceration rateComplications and deaths0.96 (0.12 to 1.79) · 2,340 casesNo differentJul 2022 – Jun 2024
CMS Medicare PSI 90: Patient safety and adverse events compositeComplications and deaths1.02 (0.76 to 1.28)No differentJul 2022 – Jun 2024
Death rate among surgical inpatients with serious treatable complicationsComplications and deaths167.38 (125.03 to 209.73) · 96 casesNo differentJul 2022 – Jun 2024
Death rate for CABG surgery patientsComplications and deaths2.6 · 68 casesNoneJul 2022 – Jun 2025
Death rate for COPD patientsComplications and deaths7.1 · 185 casesNoneJul 2022 – Jun 2025
Death rate for heart attack patientsComplications and deaths11.8 · 200 casesNoneJul 2022 – Jun 2025
Death rate for heart failure patientsComplications and deaths8.9 · 814 casesNoneJul 2022 – Jun 2025
Death rate for pneumonia patientsComplications and deaths13 · 842 casesNoneJul 2022 – Jun 2025
Death rate for stroke patientsComplications and deaths9.6 · 361 casesNoneJul 2023 – Jun 2025
Hybrid Hospital-Wide All-Cause Risk Standardized Mortality RateComplications and deaths2.6 · 4,633 casesNoneJul 2024 – Jun 2025
Iatrogenic pneumothorax rateComplications and deaths0.16 (0 to 0.34) · 11,474 casesNo differentJul 2022 – Jun 2024
In-hospital fall-associated fracture rateComplications and deaths0.27 (0.1 to 0.45) · 11,626 casesNo differentJul 2022 – Jun 2024
Perioperative pulmonary embolism or deep vein thrombosis rateComplications and deaths3.14 (1.39 to 4.9) · 2,814 casesNo differentJul 2022 – Jun 2024
Postoperative acute kidney injury requiring dialysis rateComplications and deaths2 (0.61 to 3.39) · 1,327 casesNo differentJul 2022 – Jun 2024
Postoperative hemorrhage or hematoma rateComplications and deaths2.11 (0.8 to 3.43) · 2,641 casesNo differentJul 2022 – Jun 2024
Postoperative respiratory failure rateComplications and deaths9.39 (4.18 to 14.6) · 1,287 casesNo differentJul 2022 – Jun 2024
Postoperative sepsis rateComplications and deaths6.57 (3.47 to 9.68) · 1,308 casesNo differentJul 2022 – Jun 2024
Postoperative wound dehiscence rateComplications and deaths2.14 (0.71 to 3.57) · 827 casesNo differentJul 2022 – Jun 2024
Pressure ulcer rateComplications and deaths0.6 (0.05 to 1.15) · 9,460 casesNo differentJul 2022 – Jun 2024
Rate of complications for hip/knee replacement patientsComplications and deaths4.5 · 122 casesNoneApr 2023 – Mar 2025
Catheter Associated Urinary Tract Infections (ICU + select Wards)Infections0.993No differentOct 2024 – Sep 2025
SSI - Abdominal HysterectomyInfections0.706No differentOct 2024 – Sep 2025
SSI - Colon SurgeryInfections1.376No differentOct 2024 – Sep 2025
Acute Myocardial Infarction (AMI) 30-Day Readmission RateUnplanned return visits15.5 · 218 casesNoneJul 2023 – Jun 2025
Heart failure (HF) 30-Day Readmission RateUnplanned return visits19.5 · 962 casesNoneJul 2023 – Jun 2025
Hospital return days for heart attack patientsUnplanned return visits3.8 · 200 casesNoneJul 2022 – Jun 2025
Hospital return days for heart failure patientsUnplanned return visits-17 · 922 casesNoneJul 2022 – Jun 2025
Hospital return days for pneumonia patientsUnplanned return visits18.6 · 860 casesNoneJul 2022 – Jun 2025
Pneumonia (PN) 30-Day Readmission RateUnplanned return visits18.7 · 827 casesNoneJul 2023 – Jun 2025
Rate of emergency department (ED) visits for patients receiving outpatient chemotherapyUnplanned return visits6.1 (4.5 to 8.2) · 313 casesNo differentJan 2024 – Dec 2024
Rate of inpatient admissions for patients receiving outpatient chemotherapyUnplanned return visits13.4 (10.6 to 16.5) · 313 casesNo differentJan 2024 – Dec 2024
Rate of readmission after hip/knee replacementUnplanned return visits6.1 · 144 casesNoneJul 2023 – Jun 2025
Rate of readmission for CABGUnplanned return visits10.3 · 80 casesNoneJul 2023 – Jun 2025
Rate of readmission for chronic obstructive pulmonary disease (COPD) patientsUnplanned return visits20.7 · 237 casesNoneJul 2023 – Jun 2025
Rate of unplanned hospital visits after colonoscopy (per 1,000 colonoscopies)Unplanned return visits12.8 (10 to 16.1) · 1,639 casesNo differentJan 2022 – Dec 2024
Ratio of unplanned hospital visits after hospital outpatient surgeryUnplanned return visits0.9 (0.8 to 1.1) · 1,619 casesNo differentJan 2024 – Dec 2024

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

Patient survey stars by topic at El Camino Health
Cleanliness4
Nurse communication4
Doctor communication4
Communication about medicines3
Discharge information3
Overall hospital rating4
Quietness2
Recommend hospital5
Share of patients giving the best answer at El Camino Health
Room was "always" clean75%
Nurses "always" communicated well79%
Doctors "always" communicated well81%
Staff "always" explained61%
Yes, staff "did" give patients this information86%
Yes, staff "did" give patients information about help after discharge86%
Doctors "always" explained things so they could understand76%
Doctors "always" listened carefully80%
Doctors "always" treated them with courtesy and respect87%
Patients who gave a rating of "9" or "10" (high)76%
Staff "always" explained new medications76%
Nurses "always" explained things so they could understand75%
Nurses "always" listened carefully76%
Nurses "always" treated them with courtesy and respect87%
"Always" quiet at night47%
"YES", patients would definitely recommend the hospital80%
Staff "always" explained possible side effects46%
Yes, staff "did" give patients information about possible symptoms86%
See every measure and the patient survey for San Mateo Medical Center

Behind the star rating — Deaths: 0 better, 2 the same, 0 worse of 2 measures. Safety: 0 better, 2 the same, 0 worse of 2 measures. Readmissions: 0 better, 3 the same, 0 worse of 3 measures. The star rating is worked out from an earlier period than the measures below, so the two can disagree.

Every scored measure at San Mateo Medical Center
Abdominopelvic accidental puncture or laceration rateComplications and deaths1.34 (0.25 to 2.43) · 45 casesNo differentJul 2022 – Jun 2024
CMS Medicare PSI 90: Patient safety and adverse events compositeComplications and deaths0.97 (0.48 to 1.47)No differentJul 2022 – Jun 2024
Death rate for pneumonia patientsComplications and deaths13.9 · 25 casesNoneJul 2022 – Jun 2025
Hybrid Hospital-Wide All-Cause Risk Standardized Mortality RateComplications and deaths3.6 · 258 casesNoneJul 2024 – Jun 2025
Iatrogenic pneumothorax rateComplications and deaths0.21 (0 to 0.44) · 379 casesNo differentJul 2022 – Jun 2024
In-hospital fall-associated fracture rateComplications and deaths0.26 (0.05 to 0.48) · 381 casesNo differentJul 2022 – Jun 2024
Perioperative pulmonary embolism or deep vein thrombosis rateComplications and deaths3.44 (0.82 to 6.05) · 57 casesNo differentJul 2022 – Jun 2024
Postoperative hemorrhage or hematoma rateComplications and deaths2.64 (0.92 to 4.37) · 57 casesNo differentJul 2022 – Jun 2024
Pressure ulcer rateComplications and deaths0.53 (0 to 1.76) · 296 casesNo differentJul 2022 – Jun 2024
Clostridium Difficile (C.Diff)Infections0.661No differentOct 2024 – Sep 2025
Heart failure (HF) 30-Day Readmission RateUnplanned return visits21.8 · 47 casesNoneJul 2023 – Jun 2025
Hospital return days for pneumonia patientsUnplanned return visits-2.3 · 25 casesNoneJul 2022 – Jun 2025
Pneumonia (PN) 30-Day Readmission RateUnplanned return visits16.6 · 76 casesNoneJul 2023 – Jun 2025
Rate of unplanned hospital visits after colonoscopy (per 1,000 colonoscopies)Unplanned return visits14 (10.4 to 18.9) · 167 casesNo differentJan 2022 – Dec 2024

What patients said (208 patients answered, 15% of those asked)

Patient survey stars by topic at San Mateo Medical Center
Cleanliness4
Nurse communication3
Doctor communication3
Communication about medicines3
Discharge information4
Overall hospital rating3
Quietness2
Recommend hospital3
Share of patients giving the best answer at San Mateo Medical Center
Room was "always" clean78%
Nurses "always" communicated well76%
Doctors "always" communicated well79%
Staff "always" explained62%
Yes, staff "did" give patients this information87%
Yes, staff "did" give patients information about help after discharge88%
Doctors "always" explained things so they could understand74%
Doctors "always" listened carefully77%
Doctors "always" treated them with courtesy and respect84%
Patients who gave a rating of "9" or "10" (high)70%
Staff "always" explained new medications72%
Nurses "always" explained things so they could understand72%
Nurses "always" listened carefully73%
Nurses "always" treated them with courtesy and respect82%
"Always" quiet at night47%
"YES", patients would definitely recommend the hospital68%
Staff "always" explained possible side effects51%
Yes, staff "did" give patients information about possible symptoms86%

Original Medicare doctor bills

$5,920

Medicare paid this office $5,920 for 47 people.

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

Largest Original Medicare bills
Emergency department visit with high level of medical decision making24$3,343$139
Emergency department visit with moderate level of medical decision making18$1,712$95

Who their Medicare patients are

47 Original Medicare patients in 2024. Average age 66 · Women 55% · Also on Medicaid 77% · Health risk score 1.15. At or below the middle of the specialty; the typical emergency medicine clinician is at 2.01.

Conditions among them: High blood pressure 66% · Diabetes 36% · Depression 23%.

The office billed $54,263, Medicare allowed $7,955 and paid $5,920; for 56 services of 8 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.

Medicaid work

$99,449 in 2024

Medicaid paid $99,449 for 1,822 billed services this clinician did in 2024, up to 166 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 2024
EMERGENCY DEPT VISIT MOD MDM521$39,472
EMERGENCY DEPARTMENT VISIT HIGH MDM261$28,588
Service292$10,753
Infectious disease (viral respiratory tract infection), pathogen-specific RNA, 4 targets (severe acute respiratory syndrome coronavirus 2 [SARS-CoV-2], influenza A, influenza B, respiratory syncytial virus [RSV]), upper respiratory specimen, each pathogen reported as detected or not detected74$10,302
Infectious agent detection by nucleic acid (DNA or RNA); severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) (coronavirus disease [COVID-19]) and influenza virus types A and B, multiplex amplified probe technique27$3,709
Service254$1,690
EMERGENCY DEPT VISIT LOW MDM32$1,658
COMPREHENSIVE METABOLIC PANEL91$1,028
Electrocardiogram, routine ECG with at least 12 leads; interpretation and report only61$860
Blood count; complete (CBC), automated (Hgb, Hct, RBC, WBC and platelet count) and automated differential WBC count94$778
ASSAY OF LIPASE41$273
URINE PREGNANCY TEST15$154
Medicaid work by year
20241,82214166$99,449

Drugs they prescribed that Part D paid

$245

Pharmacies billed $245 in 2024.

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

59 generic and 0 brand-name prescriptions · $245 in drug cost · 27 antibiotic prescriptions to 23 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.

Largest Part D drug costs
Cephalexin16$73$5

Year by year

Part D prescribing by year
20245948None0%$245
202350410% (0)None$691

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

See the drugs prescribed each year

2023: 1 drug

Part D drugs prescribed in 2023
Cephalexin15$144$10

Professional record

NPI
1114504321
Licence
CA 20A21076
Trained
Kansas City University of Med & Biosciences, College of Osteo Med, 2021
Gender
Male
More record details
Sole proprietor
No
Taxonomy
Federal specialty code 207P00000X (207P00000X); Student in a training program (390200000X)
Mailing address
222 W 39th Ave, San Mateo, CA, 94403
NPI first listed
2021-03-24
NPI last updated
2024-09-05
NPI record certified
2024-09-05

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