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Worasak Keeyapaj, MD

Anesthesiology · Stanford

NPI 1104092477

Medicare standing
Clear
Enrolled, allowed to bill and order, not excluded
Plans that list them
Not verified
Not the same as out of network.
Offices
2

Offices

2 locations · 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. Keeyapaj’s office to ask if they take your plan before you enroll.

California Medical Board record

Licence A133317 · Current

Licensed to practise in California · since 2014 · expires 2028-06-30 · Chulalongkorn University Faculty 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.

  • 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

$68,982

Medicare paid this office $68,982 for 134 people.

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

Largest Original Medicare bills
Anesthesia for procedure on heart and large blood vessels using heart-lung machine (1 year or older)17$15,348$903
Anesthesia for procedure on heart and large blood vessels20$9,674$484
Anesthesia for x-ray on artery of brain, heart, or chest19$7,586$399
Anesthesia for x-ray or radiation therapy35$7,065$202
Ultrasound of heart with probe in esophagus, with report35$3,585$94
See all 10 services
Every Original Medicare service billed
Anesthesia for procedure on heart and large blood vessels using heart-lung machine (1 year or older)17$15,348$903
Anesthesia for procedure on heart and large blood vessels20$9,674$484
Anesthesia for x-ray on artery of brain, heart, or chest19$7,586$399
Anesthesia for x-ray or radiation therapy35$7,065$202
Ultrasound of heart with probe in esophagus, with report35$3,585$94
Insertion of artery tube for blood sampling or infusion through skin56$2,103$38
Insertion of non-tunneled central venous tube for infusion (5 years or older)17$1,295$72
Insertion of tube in pulmonary artery for monitoring16$1,184$74
Ultrasound of heart blood flow, valves and chambers13$207$16
Ultrasound of heart with color-depicted blood flow, rate and valve function26$75$3

Who their Medicare patients are

134 Original Medicare patients in 2024. Average age 76 · Women 41% · Also on Medicaid 26% · Health risk score 2.10. Above the middle of the specialty; the typical anesthesiology clinician is at 1.54.

Conditions among them: High blood pressure 75% · Heart failure 69% · Atrial fibrillation 69% · Coronary heart disease 68% · Chronic kidney disease 66% · Diabetes 44% · Stroke 25% · Depression 24% · Cancer 22% · COPD 20% · Dementia 17%.

The office billed $590,809, Medicare allowed $86,751 and paid $68,982; for 321 services of 37 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
2024134321762.10$590,809$68,982
2023105284742.21$488,390$59,652
2022140391722.58$601,439$70,240
2021121365722.61$594,848$61,975
2020130450722.15$741,903$75,819
2019161531752.17$811,772$82,772
2018164688741.91$928,687$96,738
2017178734752.05$994,599$112,713
2016167742731.53$993,765$113,639
2015170302701.86$514,785$57,522
2014191338712.08$534,476$62,330
2013212357702.25$658,649$74,296

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
Anesthesia for procedure on heart and large blood vessels using heart-lung machine (1 year or older)15$14,327$955
Anesthesia for procedure on heart and large blood vessels18$10,844$571
Anesthesia for x-ray or radiation therapy25$5,095$204
Ultrasound of heart with probe in esophagus, with report28$2,839$98
Insertion of non-tunneled central venous tube for infusion (5 years or older)28$2,377$74
Insertion of artery tube for blood sampling or infusion through skin47$1,834$39
Insertion of tube in pulmonary artery for monitoring13$1,002$77
Ultrasound of heart blood flow, valves and chambers17$279$16
Ultrasound of heart with color-depicted blood flow, rate and valve function26$77$3

2022: 12 services

Original Medicare services billed in 2022
Anesthesia for procedure on heart and large blood vessels using heart-lung machine (1 year or older)17$14,310$842
Anesthesia for procedure on heart and large blood vessels19$9,135$481
Anesthesia for x-ray on artery of brain, heart, or chest15$6,605$440
Ultrasound of heart with probe in esophagus, with report33$3,289$100
Anesthesia for x-ray or radiation therapy16$3,169$198
Insertion of non-tunneled central venous tube for infusion (5 years or older)33$3,146$75
Insertion of artery tube for blood sampling or infusion through skin63$2,459$39
Insertion of tube in pulmonary artery for monitoring25$2,024$78
Anesthesia for procedure to correct abnormal heart rhythm18$2,009$112
Ultrasonic guidance for blood vessel access17$273$12
Ultrasound of heart blood flow, valves and chambers, follow-up29$191$7
Ultrasound of heart with color-depicted blood flow, rate and valve function33$95$3

2021: 10 services

Original Medicare services billed in 2021
Anesthesia for procedure on heart and large blood vessels using heart-lung machine (1 year or older)17$14,465$851
Anesthesia for procedure on heart and large blood vessels22$9,828$427
Insertion of non-tunneled central venous tube for infusion (5 years or older)31$4,108$76
Anesthesia for x-ray or radiation therapy20$3,768$188
Ultrasound of heart with probe in esophagus, with report36$3,637$101
Insertion of artery tube for blood sampling or infusion through skin60$2,466$40
Insertion of tube in pulmonary artery for monitoring22$1,809$79
Anesthesia for procedure to correct abnormal heart rhythm12$1,376$106
Ultrasound of heart blood flow, valves and chambers, follow-up26$174$7
Ultrasound of heart with color-depicted blood flow, rate and valve function36$106$3

2020: 10 services

Original Medicare services billed in 2020
Anesthesia for procedure on heart and large blood vessels using heart-lung machine (1 year or older)20$18,353$918
Anesthesia for procedure on heart and large blood vessels19$8,049$424
Insertion of non-tunneled central venous tube for infusion (5 years or older)42$5,976$78
Ultrasound of heart with probe in esophagus, with report45$4,741$103
Anesthesia for procedure to correct abnormal heart rhythm30$3,084$103
Insertion of artery tube for blood sampling or infusion through skin65$2,742$40
Insertion of tube in pulmonary artery for monitoring33$2,647$80
Anesthesia for x-ray or radiation therapy13$2,195$169
Ultrasound of heart blood flow, valves and chambers, follow-up40$275$7
Ultrasound of heart with color-depicted blood flow, rate and valve function45$136$3

2019: 9 services

Original Medicare services billed in 2019
Anesthesia for procedure on heart and large blood vessels using heart-lung machine (1 year or older)29$23,416$807
Anesthesia for procedure on heart and large blood vessels34$12,790$365
Insertion of non-tunneled central venous tube for infusion (5 years or older)52$6,838$76
Ultrasound of heart with probe in esophagus, with report50$5,174$100
Anesthesia for procedure to correct abnormal heart rhythm53$5,137$93
Insertion of artery tube for blood sampling or infusion through skin85$3,439$40
Insertion of tube in pulmonary artery for monitoring34$2,677$79
Ultrasound of heart blood flow, valves and chambers, follow-up44$305$7
Ultrasound of heart with color-depicted blood flow, rate and valve function49$149$3

2018: 10 services

Original Medicare services billed in 2018
Anesthesia for procedure on heart and large blood vessels using heart-lung machine (1 year or older)35$28,521$815
Anesthesia for procedure on heart and large blood vessels37$12,218$313
Insertion of non-tunneled central venous tube for infusion (5 years or older)65$9,338$89
Ultrasound of heart with probe in esophagus, with report60$6,126$99
Anesthesia for procedure to correct abnormal heart rhythm53$4,820$88
Insertion of artery tube for blood sampling or infusion through skin87$3,600$39
Insertion of tube in pulmonary artery for monitoring37$3,490$94
Ultrasonic guidance for blood vessel access63$1,219$13
Ultrasound of heart blood flow, valves and chambers, follow-up55$364$7
Ultrasound of heart with color-depicted blood flow, rate and valve function60$180$3

2017: 12 services

Original Medicare services billed in 2017
Anesthesia for procedure on heart and large blood vessels using heart-lung machine (1 year or older)68$43,453$639
Insertion of non-tunneled central venous tube for infusion (5 years or older)69$11,967$106
Anesthesia for heart artery bypass grafting on heart-lung machine11$8,332$757
Anesthesia for x-ray on artery of brain, heart, or chest19$6,588$347
Ultrasound of heart with probe in esophagus, with report64$6,315$99
Insertion of artery tube for blood sampling or infusion through skin114$5,177$45
Anesthesia for procedure on heart and large blood vessels11$4,902$446
Insertion of tube in pulmonary artery for monitoring39$4,364$112
Anesthesia for procedure to correct abnormal heart rhythm33$3,136$92
Ultrasonic guidance for blood vessel access69$1,345$13
Ultrasound of heart blood flow, valves and chambers, follow-up51$337$7
Ultrasound of heart with color-depicted blood flow, rate and valve function64$186$3

2016: 12 services

Original Medicare services billed in 2016
Anesthesia for procedure on heart and large blood vessels using heart-lung machine (1 year or older)48$32,623$680
Insertion of non-tunneled central venous tube for infusion (5 years or older)72$13,382$106
Anesthesia for procedure on heart and large blood vessels using heart-lung machine and stopping blood flow14$12,742$910
Anesthesia for heart artery bypass grafting on heart-lung machine13$10,103$777
Ultrasound of heart with probe in esophagus, with report69$7,515$109
Insertion of tube in pulmonary artery for monitoring50$5,611$112
Anesthesia for x-ray on artery of brain, heart, or chest14$5,348$382
Insertion of artery tube for blood sampling or infusion through skin105$4,907$45
Anesthesia for procedure to correct abnormal heart rhythm32$2,966$87
Ultrasonic guidance for blood vessel access58$1,101$13
Ultrasound of heart blood flow, valves and chambers, follow-up59$389$7
Ultrasound of heart with color-depicted blood flow, rate and valve function69$199$3

2015: 5 services

Original Medicare services billed in 2015
Anesthesia for procedure on heart and large blood vessels using heart-lung machine (1 year or older)16$13,414$838
Insertion of tube in pulmonary artery for monitoring23$2,416$105
Insertion of artery tube for blood sampling or infusion through skin42$1,756$42
Anesthesia for procedure to correct abnormal heart rhythm14$938$67
Insertion of probe in esophagus for heart ultrasound37$675$18

2014: 7 services

Original Medicare services billed in 2014
Anesthesia for procedure on heart and large blood vessels using heart-lung machine (1 year or older)15$12,347$823
Insertion of tube in pulmonary artery for monitoring28$2,969$106
Anesthesia for procedure to assess heart electrical activity13$2,858$220
Insertion of artery tube for blood sampling or infusion through skin44$1,845$42
Anesthesia for procedure to correct abnormal heart rhythm27$1,791$62
Insertion of probe in esophagus for heart ultrasound32$1,122$34
Ultrasonic guidance for blood vessel access22$273$12

2013: 6 services

Original Medicare services billed in 2013
Anesthesia for procedure on heart and large blood vessels using heart-lung machine (1 year or older)21$17,860$850
Insertion of tube in pulmonary artery for monitoring32$3,310$103
Anesthesia for other procedure on upper abdomen12$3,063$255
Insertion of artery tube for blood sampling or infusion through skin49$1,997$41
Insertion of probe in esophagus for heart ultrasound40$1,328$33
Anesthesia for procedure to correct abnormal heart rhythm19$1,144$57

Money from drug and device companies

$203 in 2025

Industry payments by year
202522None$203
202424None$423
202314$2,000$4,700

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
Octapharma USABalfaxar$171
1 payment
  • Meals for Balfaxar · 2025-04-07 · $171
Vertex PharmaceuticalsNone$31
1 payment
  • Meals · 2025-10-12 · $31
See all 2 published payments
Every published payment
Vertex PharmaceuticalsMeals · 2025-10-12None$31
Octapharma USAMeals · 2025-04-07Balfaxar$171
See earlier years (2024, 2023)

2024: $423

Payments by company in 2024
CerusIntercept Blood System for Platelets$382
3 payments
  • Meals for Intercept Blood System for Platelets · 2024-09-05 · $117
  • Meals for Intercept Blood System for Platelets · 2024-04-30 · $63
  • Meals for Intercept Blood System for Platelets · 2024-04-29 · $201
Edwards LifesciencesSapien 3 Ultra Resilia$41
1 payment
  • Meals for Sapien 3 Ultra Resilia · 2024-01-03 · $41

2023: $4,700

Payments by company in 2023
CerusIntercept Blood System for Platelets$4,700
4 payments
  • Honoraria for Intercept Blood System for Platelets · 2023-06-08 · $2,000
  • Meals for Intercept Blood System for Platelets · 2023-06-02 · $108
  • Travel for Intercept Blood System for Platelets · 2023-05-09 · $2,501
  • Gift for Intercept Blood System for Platelets · 2023-05-06 · $92

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
1104092477
Licence
CA A133317California A133317: Current · expires 2028-06-30
Gender
Male
More record details
Sole proprietor
No
Taxonomy
Federal specialty code 207L00000X (207L00000X)
Mailing address
1804 Embarcadero Rd, Suite 100, Palo Alto, CA, 94303
NPI first listed
2008-05-06
NPI last updated
2024-04-11
NPI record certified
2024-04-11

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