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Sarah R Williams, MD

Emergency Medicine · Stanford

NPI 1366476640

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
Since medical school
29 years
Stanford University School of Medicine, 1997

Offices

1 location · Stanford Health Care · 3,152 clinicians in this group

Looking this up.

Hospitals listed: Stanford Health Care. 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. Williams’s office at (650) 723-4000 to ask if they take your plan before you enroll.

California Medical Board record

Licence A66325 · Current

Licensed to practise in California · since 1998 · expires 2028-04-30 · Stanford University School of Medicine.

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

School, training and certification

What this clinician told their state board, medical school and everything before it. Only some states publish this, so nothing here means the state does not say, not that there was no training or certification.

Specialty certification

  • American Board of Emergency Medicine - Emergency Medicine

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.

  • Stanford Health CareStanford, CAAcute Care Hospital · Voluntary non-profit - Private · Has an emergency departmentPart of Stanford Health Care, which runs 3 hospitalsHome of Stanford Cancer Institute, a National Cancer Institute designated comprehensive cancer centrePatients rate it 4 of 5 · 83% would definitely recommend it
    Overall rating: 5 of 5 starsWorse than the national rate — Perioperative pulmonary embolism or deep vein thrombosis rate: 5.31 (4.24 to 6.37) · 8,661 cases, Jul 2022 – Jun 2024Worse than the national rate — Rate of inpatient admissions for patients receiving outpatient chemotherapy: 14.1 (12.7 to 15.7) · 2,191 cases, Jan 2024 – Dec 2024Better than the national rate — Postoperative respiratory failure rate: 4.08 (1.95 to 6.21) · 5,296 cases, Jul 2022 – Jun 2024Better than the national rate — Catheter Associated Urinary Tract Infections (ICU + select Wards): 0.317, Oct 2024 – Sep 2025Better than the national rate — Clostridium Difficile (C.Diff): 0.446, Oct 2024 – Sep 2025Better than the national rate — SSI - Colon Surgery: 0.241, Oct 2024 – Sep 2025Better than the national rate — Ratio of unplanned hospital visits after hospital outpatient surgery: 0.7 (0.6 to 0.9) · 3,348 cases, Jan 2024 – Dec 2024
See every measure and the patient survey for Stanford Health Care

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: 2 better, 5 the same, 4 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 Stanford Health Care
Perioperative pulmonary embolism or deep vein thrombosis rateComplications and deaths5.31 (4.24 to 6.37) · 8,661 casesWorseJul 2022 – Jun 2024
Rate of inpatient admissions for patients receiving outpatient chemotherapyUnplanned return visits14.1 (12.7 to 15.7) · 2,191 casesWorseJan 2024 – Dec 2024
Postoperative respiratory failure rateComplications and deaths4.08 (1.95 to 6.21) · 5,296 casesBetterJul 2022 – Jun 2024
Catheter Associated Urinary Tract Infections (ICU + select Wards)Infections0.317BetterOct 2024 – Sep 2025
Clostridium Difficile (C.Diff)Infections0.446BetterOct 2024 – Sep 2025
SSI - Colon SurgeryInfections0.241BetterOct 2024 – Sep 2025
Ratio of unplanned hospital visits after hospital outpatient surgeryUnplanned return visits0.7 (0.6 to 0.9) · 3,348 casesBetterJan 2024 – Dec 2024
Abdominopelvic accidental puncture or laceration rateComplications and deaths1.06 (0.45 to 1.67) · 5,374 casesNo differentJul 2022 – Jun 2024
CMS Medicare PSI 90: Patient safety and adverse events compositeComplications and deaths0.86 (0.72 to 1)No differentJul 2022 – Jun 2024
Death rate among surgical inpatients with serious treatable complicationsComplications and deaths166.09 (137.88 to 194.3) · 470 casesNo differentJul 2022 – Jun 2024
Death rate for CABG surgery patientsComplications and deaths1.1 · 192 casesNoneJul 2022 – Jun 2025
Death rate for COPD patientsComplications and deaths6.4 · 146 casesNoneJul 2022 – Jun 2025
Death rate for heart attack patientsComplications and deaths9.7 · 253 casesNoneJul 2022 – Jun 2025
Death rate for heart failure patientsComplications and deaths6.3 · 880 casesNoneJul 2022 – Jun 2025
Death rate for pneumonia patientsComplications and deaths10.3 · 935 casesNoneJul 2022 – Jun 2025
Death rate for stroke patientsComplications and deaths8.7 · 501 casesNoneJul 2023 – Jun 2025
Hybrid Hospital-Wide All-Cause Risk Standardized Mortality RateComplications and deaths2.1 · 7,730 casesNoneJul 2024 – Jun 2025
Iatrogenic pneumothorax rateComplications and deaths0.13 (0 to 0.27) · 20,799 casesNo differentJul 2022 – Jun 2024
In-hospital fall-associated fracture rateComplications and deaths0.28 (0.14 to 0.43) · 23,182 casesNo differentJul 2022 – Jun 2024
Postoperative acute kidney injury requiring dialysis rateComplications and deaths0.94 (0.2 to 1.68) · 5,694 casesNo differentJul 2022 – Jun 2024
Postoperative hemorrhage or hematoma rateComplications and deaths2.36 (1.54 to 3.19) · 7,846 casesNo differentJul 2022 – Jun 2024
Postoperative sepsis rateComplications and deaths5.2 (3.76 to 6.64) · 5,603 casesNo differentJul 2022 – Jun 2024
Postoperative wound dehiscence rateComplications and deaths1.38 (0.23 to 2.53) · 2,211 casesNo differentJul 2022 – Jun 2024
Pressure ulcer rateComplications and deaths0.52 (0.21 to 0.83) · 19,915 casesNo differentJul 2022 – Jun 2024
Rate of complications for hip/knee replacement patientsComplications and deaths3.6 · 416 casesNoneApr 2023 – Mar 2025
Central Line Associated Bloodstream Infection (ICU + select Wards)Infections0.869No differentOct 2024 – Sep 2025
MRSA BacteremiaInfections0.857No differentOct 2024 – Sep 2025
SSI - Abdominal HysterectomyInfections0.368No differentOct 2024 – Sep 2025
Acute Myocardial Infarction (AMI) 30-Day Readmission RateUnplanned return visits16.2 · 247 casesNoneJul 2023 – Jun 2025
Heart failure (HF) 30-Day Readmission RateUnplanned return visits20.5 · 1,021 casesNoneJul 2023 – Jun 2025
Hospital return days for heart attack patientsUnplanned return visits47.8 · 258 casesNoneJul 2022 – Jun 2025
Hospital return days for heart failure patientsUnplanned return visits-1.6 · 990 casesNoneJul 2022 – Jun 2025
Hospital return days for pneumonia patientsUnplanned return visits20.8 · 976 casesNoneJul 2022 – Jun 2025
Pneumonia (PN) 30-Day Readmission RateUnplanned return visits16.5 · 959 casesNoneJul 2023 – Jun 2025
Rate of emergency department (ED) visits for patients receiving outpatient chemotherapyUnplanned return visits5.2 (4.4 to 6.2) · 2,191 casesNo differentJan 2024 – Dec 2024
Rate of readmission after hip/knee replacementUnplanned return visits5.1 · 425 casesNoneJul 2023 – Jun 2025
Rate of readmission for CABGUnplanned return visits9.6 · 158 casesNoneJul 2023 – Jun 2025
Rate of readmission for chronic obstructive pulmonary disease (COPD) patientsUnplanned return visits19.6 · 183 casesNoneJul 2023 – Jun 2025
Rate of unplanned hospital visits after colonoscopy (per 1,000 colonoscopies)Unplanned return visits12.7 (10.4 to 15.4) · 4,578 casesNo differentJan 2022 – Dec 2024

What patients said (6,810 patients answered, 25% of those asked)

Patient survey stars by topic at Stanford Health Care
Cleanliness4
Nurse communication4
Doctor communication4
Communication about medicines3
Discharge information4
Overall hospital rating4
Quietness2
Recommend hospital5
Share of patients giving the best answer at Stanford Health Care
Room was "always" clean75%
Nurses "always" communicated well82%
Doctors "always" communicated well81%
Staff "always" explained63%
Yes, staff "did" give patients this information89%
Yes, staff "did" give patients information about help after discharge89%
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)79%
Staff "always" explained new medications76%
Nurses "always" explained things so they could understand77%
Nurses "always" listened carefully79%
Nurses "always" treated them with courtesy and respect88%
"Always" quiet at night53%
"YES", patients would definitely recommend the hospital83%
Staff "always" explained possible side effects50%
Yes, staff "did" give patients information about possible symptoms90%

Original Medicare doctor bills

$13,767

Medicare paid this office $13,767 for 93 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 making70$10,405$147
Ultrasound of heart, follow-up14$311$22

Who their Medicare patients are

93 Original Medicare patients in 2024. Average age 77 · Women 42% · Also on Medicaid 33% · Health risk score 2.50. Above the middle of the specialty; the typical emergency medicine clinician is at 2.01.

Conditions among them: High blood pressure 75% · Coronary heart disease 43% · Heart failure 41% · Diabetes 35% · Chronic kidney disease 30% · Atrial fibrillation 28% · Cancer 27% · Depression 27% · Dementia 23% · COPD 18% · Stroke 15%.

The office billed $89,446, Medicare allowed $17,700 and paid $13,767; for 120 services of 15 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
202493120772.50$89,446$13,767
20236477762.20$51,261$9,032
202282101751.93$57,934$11,605
2021157180761.95$103,104$20,776
2020162202742.24$119,114$23,274
2019135154732.26$96,732$17,688
2018181243742.23$132,869$25,590
2017162208742.37$128,311$23,453
2016133177761.99$99,515$19,371
2015118149711.98$82,783$17,448
2014112146682.20$90,642$17,421
2013218255732.13$143,800$29,319

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: 2 services

Original Medicare services billed in 2023
Emergency department visit with high level of medical decision making31$4,788$154
Emergency department visit with moderate level of medical decision making17$1,840$108

2022: 2 services

Original Medicare services billed in 2022
Emergency department visit with high level of medical decision making29$4,759$164
Emergency department visit with moderate level of medical decision making39$4,607$118

2021: 3 services

Original Medicare services billed in 2021
Emergency department visit with high level of medical decision making49$8,372$171
Emergency department visit with moderate level of medical decision making62$7,164$114
Hospital observation care on day of discharge18$1,393$77

2020: 5 services

Original Medicare services billed in 2020
Emergency department visit with high level of medical decision making90$13,895$151
Critical care, first 30-74 minutes15$3,135$209
Emergency department visit with moderate level of medical decision making20$2,221$111
Hospital observation care on day of discharge15$963$64
Ultrasound of heart, follow-up12$289$24

2019: 3 services

Original Medicare services billed in 2019
Emergency department visit with high level of medical decision making77$10,836$141
Emergency department visit with moderate level of medical decision making27$2,627$97
Critical care, first 30-74 minutes11$2,040$185

2018: 5 services

Original Medicare services billed in 2018
Emergency department visit with high level of medical decision making109$15,345$140
Emergency department visit with moderate level of medical decision making37$3,485$94
Ultrasound of heart, follow-up20$466$23
Limited ultrasound scan of abdomen11$281$26
Ultrasound scan of chest11$256$23

2017: 4 services

Original Medicare services billed in 2017
Emergency department visit with high level of medical decision making92$13,473$145
Emergency department visit with moderate level of medical decision making35$3,534$101
Critical care, first 30-74 minutes16$3,140$196
Ultrasound of heart, follow-up18$419$23

2016: 4 services

Original Medicare services billed in 2016
Emergency department visit with high level of medical decision making67$9,860$147
Critical care, first 30-74 minutes21$3,865$184
Emergency department visit with moderate level of medical decision making22$2,048$93
Ultrasound of heart, follow-up19$441$23

2015: 4 services

Original Medicare services billed in 2015
Emergency department visit with high level of medical decision making68$10,163$147
Critical care, first 30-74 minutes15$2,942$196
Emergency department visit with moderate level of medical decision making26$2,552$98
Ultrasound of heart, follow-up18$418$23

2014: 4 services

Original Medicare services billed in 2014
Emergency department visit with high level of medical decision making61$9,005$141
Critical care, first 30-74 minutes21$4,105$195
Emergency department visit with moderate level of medical decision making25$2,415$97
Ultrasound of heart, follow-up12$276$23

2013: 4 services

Original Medicare services billed in 2013
Emergency department visit with high level of medical decision making96$13,495$139
Emergency department visit with moderate level of medical decision making56$5,082$91
Critical care, first 30-74 minutes25$4,740$190
Hospital observation care on day of discharge17$1,089$61

Medicaid work

$19,586 in 2024

Medicaid paid $19,586 for 172 billed services this clinician did in 2024, up to 19 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 DEPARTMENT VISIT HIGH MDM102$12,538
EMERGENCY DEPT VISIT MOD MDM70$7,048
Medicaid work by year
2024172219$19,586
2023159318$12,963
2022203234$15,314
2021165320$10,537
2020101323$6,029
2019137319$10,436
2018117218$10,758
See the largest Medicaid services in earlier years

2023

Largest Medicaid services in 2023
EMERGENCY DEPT VISIT MOD MDM78$7,181
EMERGENCY DEPT VISIT LOW MDM52$2,909
EMERGENCY DEPARTMENT VISIT HIGH MDM29$2,873

2022

Largest Medicaid services in 2022
EMERGENCY DEPT VISIT MOD MDM191$14,930
EMERGENCY DEPARTMENT VISIT STRAIGHTFORWARD MDM12$384

2021

Largest Medicaid services in 2021
EMERGENCY DEPT VISIT MOD MDM117$7,656
EMERGENCY DEPARTMENT VISIT HIGH MDM17$2,055
EMERGENCY DEPARTMENT VISIT STRAIGHTFORWARD MDM31$827

2020

Largest Medicaid services in 2020
EMERGENCY DEPT VISIT LOW MDM59$2,693
EMERGENCY DEPT VISIT MOD MDM27$1,882
EMERGENCY DEPARTMENT VISIT HIGH MDM15$1,453

2019

Largest Medicaid services in 2019
EMERGENCY DEPARTMENT VISIT HIGH MDM57$5,185
EMERGENCY DEPT VISIT MOD MDM61$4,312
EMERGENCY DEPT VISIT LOW MDM19$939

2018

Largest Medicaid services in 2018
EMERGENCY DEPARTMENT VISIT HIGH MDM72$7,378
EMERGENCY DEPT VISIT MOD MDM45$3,380

Drugs they prescribed that Part D paid

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

Year by year

Part D prescribing by year
202211NoneNone0%$172
20211813NoneNone$187
20201814NoneNone$586
20191815NoneNone$258
20183119NoneNone$3,489
20173323NoneNone$1,644
20162116NoneNone$287
20152315NoneNone$654
20142921NoneNone$1,551
20134027NoneNone$3,300

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

Checkups this office reported

Medicare did not publish checkup rates for this clinician.

Medicare’s overall office score
76.5 / 100
Scores the office’s reporting and systems. It is not a grade for how the doctor treats you.

Professional record

NPI
1366476640
Licence
CA A66325California A66325: Current · expires 2028-04-30
Trained
Stanford University School of Medicine, 1997 · 29 years ago
Gender
Female
More record details
Sole proprietor
Yes
Medicaid ID
CA 00A663250
Taxonomy
Federal specialty code 207P00000X (207P00000X)
Mailing address
300 Pasteur Dr, Stanford, CA, 94305
NPI first listed
2006-07-10
NPI last updated
2024-03-21
NPI record certified
2024-03-21

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

Extra NPI addresses: 1783 El Camino Real, Burlingame, CA, 94010