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Yen-Chung A Lee, MD

General Surgery · Stanford

NPI 1306864897

Medicare standing
Clear
Enrolled, allowed to bill and order, not excluded
Plans that list them
10
2 carriers
Office
1

Offices

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

Looking this up.

Hospitals listed: Stanford Health Care Tri-Valley. That is not proof they admit you there this week.

Plans that list them

10 plans · 2 carriers

A missing listing does not mean out of network. Directories change, and a listing does not cover every office. Call Dr. Lee’s office at (650) 723-4000 to confirm they take your plan. Ask about the office you use, its medical group, referrals and appointments.

10 of 10 plans

Plans whose provider directory lists this clinician
Alignment Health BreathEasy (HMO C-SNP)Alignment Health PlanListedOct 3, 2026
Alignment Health Clarity (HMO C-SNP)Alignment Health PlanListedOct 3, 2026
Alignment Health Harmony (HMO)Alignment Health PlanListedOct 3, 2026
Alignment Health Heart & Diabetes (HMO C-SNP)Alignment Health PlanListedOct 3, 2026
Alignment Health Heart & Diabetes CalPlus (HMO C-SNP)Alignment Health PlanListedOct 3, 2026
Alignment Health Heart & Diabetes Care (HMO C-SNP)Alignment Health PlanListedSep 28, 2026
Alignment Health Heart & Diabetes Choice (HMO C-SNP)Alignment Health PlanListedSep 28, 2026
Alignment Health Honor+ Plan (HMO)Alignment Health PlanListedOct 3, 2026
Alignment Health My Choice CalCare (HMO)Alignment Health PlanListedOct 3, 2026
SCAN Strive (HMO C-SNP)SCAN Health PlanListedOct 3, 2026

California Medical Board record

Licence A70226 · Current

Licensed to practise in California · since 1999 · expires 2027-04-30 · Mcgill 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 Care Tri-ValleyPleasanton, CAAcute Care Hospital · Voluntary non-profit - Private · Has an emergency department · Birthing-friendlyPart of Stanford Health Care, which runs 3 hospitalsPatients rate it 3 of 5 · 74% would definitely recommend it
    Overall rating: 5 of 5 starsBetter than the national rate — Central Line Associated Bloodstream Infection (ICU + select Wards): 0.178, Oct 2024 – Sep 2025Better than the national rate — Clostridium Difficile (C.Diff): 0.237, Oct 2024 – Sep 2025
See every measure and the patient survey for Stanford Health Care Tri-Valley

Behind the star rating — Deaths: 2 better, 6 the same, 0 worse of 8 measures. Safety: 2 better, 5 the same, 0 worse of 7 measures. Readmissions: 2 better, 7 the same, 0 worse of 9 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 Tri-Valley
Central Line Associated Bloodstream Infection (ICU + select Wards)Infections0.178BetterOct 2024 – Sep 2025
Clostridium Difficile (C.Diff)Infections0.237BetterOct 2024 – Sep 2025
Abdominopelvic accidental puncture or laceration rateComplications and deaths0.79 (0 to 1.73) · 1,041 casesNo differentJul 2022 – Jun 2024
CMS Medicare PSI 90: Patient safety and adverse events compositeComplications and deaths0.79 (0.5 to 1.08)No differentJul 2022 – Jun 2024
Death rate among surgical inpatients with serious treatable complicationsComplications and deaths145.81 (96.5 to 195.12) · 72 casesNo differentJul 2022 – Jun 2024
Death rate for CABG surgery patientsComplications and deaths2.9 · 55 casesNoneJul 2022 – Jun 2025
Death rate for COPD patientsComplications and deaths8.6 · 92 casesNoneJul 2022 – Jun 2025
Death rate for heart attack patientsComplications and deaths12.5 · 96 casesNoneJul 2022 – Jun 2025
Death rate for heart failure patientsComplications and deaths9.5 · 395 casesNoneJul 2022 – Jun 2025
Death rate for pneumonia patientsComplications and deaths10.3 · 391 casesNoneJul 2022 – Jun 2025
Death rate for stroke patientsComplications and deaths10.1 · 162 casesNoneJul 2023 – Jun 2025
Hybrid Hospital-Wide All-Cause Risk Standardized Mortality RateComplications and deaths3 · 1,736 casesNoneJul 2024 – Jun 2025
Iatrogenic pneumothorax rateComplications and deaths0.16 (0 to 0.37) · 4,425 casesNo differentJul 2022 – Jun 2024
In-hospital fall-associated fracture rateComplications and deaths0.22 (0.02 to 0.41) · 4,771 casesNo differentJul 2022 – Jun 2024
Perioperative pulmonary embolism or deep vein thrombosis rateComplications and deaths3.45 (1.46 to 5.44) · 1,403 casesNo differentJul 2022 – Jun 2024
Postoperative acute kidney injury requiring dialysis rateComplications and deaths1.5 (0.05 to 2.94) · 645 casesNo differentJul 2022 – Jun 2024
Postoperative hemorrhage or hematoma rateComplications and deaths1.81 (0.38 to 3.24) · 1,279 casesNo differentJul 2022 – Jun 2024
Postoperative respiratory failure rateComplications and deaths8.53 (3.2 to 13.85) · 639 casesNo differentJul 2022 – Jun 2024
Postoperative sepsis rateComplications and deaths5.15 (1.89 to 8.41) · 648 casesNo differentJul 2022 – Jun 2024
Postoperative wound dehiscence rateComplications and deaths1.61 (0.14 to 3.07) · 370 casesNo differentJul 2022 – Jun 2024
Pressure ulcer rateComplications and deaths0.16 (0 to 0.83) · 4,160 casesNo differentJul 2022 – Jun 2024
Rate of complications for hip/knee replacement patientsComplications and deaths4 · 74 casesNoneApr 2023 – Mar 2025
Catheter Associated Urinary Tract Infections (ICU + select Wards)Infections0.369No differentOct 2024 – Sep 2025
MRSA BacteremiaInfections1.112No differentOct 2024 – Sep 2025
SSI - Colon SurgeryInfections0No differentOct 2024 – Sep 2025
Acute Myocardial Infarction (AMI) 30-Day Readmission RateUnplanned return visits13.1 · 110 casesNoneJul 2023 – Jun 2025
Heart failure (HF) 30-Day Readmission RateUnplanned return visits20.1 · 437 casesNoneJul 2023 – Jun 2025
Hospital return days for heart attack patientsUnplanned return visits-5.8 · 94 casesNoneJul 2022 – Jun 2025
Hospital return days for heart failure patientsUnplanned return visits-19.3 · 456 casesNoneJul 2022 – Jun 2025
Hospital return days for pneumonia patientsUnplanned return visits-0.3 · 402 casesNoneJul 2022 – Jun 2025
Pneumonia (PN) 30-Day Readmission RateUnplanned return visits15.8 · 358 casesNoneJul 2023 – Jun 2025
Rate of emergency department (ED) visits for patients receiving outpatient chemotherapyUnplanned return visits6.8 (4.7 to 9.6) · 198 casesNo differentJan 2024 – Dec 2024
Rate of inpatient admissions for patients receiving outpatient chemotherapyUnplanned return visits10.1 (7.5 to 13.6) · 198 casesNo differentJan 2024 – Dec 2024
Rate of readmission after hip/knee replacementUnplanned return visits5.3 · 80 casesNoneJul 2023 – Jun 2025
Rate of readmission for CABGUnplanned return visits10.9 · 46 casesNoneJul 2023 – Jun 2025
Rate of readmission for chronic obstructive pulmonary disease (COPD) patientsUnplanned return visits19.3 · 92 casesNoneJul 2023 – Jun 2025
Rate of unplanned hospital visits after colonoscopy (per 1,000 colonoscopies)Unplanned return visits12.4 (9.6 to 16.2) · 1,532 casesNo differentJan 2022 – Dec 2024
Ratio of unplanned hospital visits after hospital outpatient surgeryUnplanned return visits1 (0.8 to 1.2) · 929 casesNo differentJan 2024 – Dec 2024

What patients said (1,268 patients answered, 26% of those asked)

Patient survey stars by topic at Stanford Health Care Tri-Valley
Cleanliness3
Nurse communication3
Doctor communication4
Communication about medicines3
Discharge information4
Overall hospital rating3
Quietness2
Recommend hospital4
Share of patients giving the best answer at Stanford Health Care Tri-Valley
Room was "always" clean65%
Nurses "always" communicated well77%
Doctors "always" communicated well79%
Staff "always" explained58%
Yes, staff "did" give patients this information88%
Yes, staff "did" give patients information about help after discharge88%
Doctors "always" explained things so they could understand74%
Doctors "always" listened carefully78%
Doctors "always" treated them with courtesy and respect86%
Patients who gave a rating of "9" or "10" (high)70%
Staff "always" explained new medications72%
Nurses "always" explained things so they could understand73%
Nurses "always" listened carefully74%
Nurses "always" treated them with courtesy and respect84%
"Always" quiet at night42%
"YES", patients would definitely recommend the hospital74%
Staff "always" explained possible side effects44%
Yes, staff "did" give patients information about possible symptoms89%

Original Medicare doctor bills

$108,154

Medicare paid this office $108,154 for 241 people.

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

Largest Original Medicare bills
Repair of groin hernia using an endoscope40$18,209$455
Removal of gallbladder using an endoscope31$17,530$565
New patient visit (45+ min)115$16,900$147
Return visit (30+ min)38$4,887$111
Subsequent hospital care with moderate levelof medical decision making at least 35 minutes23$3,500$67
See all 10 services
Every Original Medicare service billed
Repair of groin hernia using an endoscope40$18,209$455
Removal of gallbladder using an endoscope31$17,530$565
New patient visit (45+ min)115$16,900$147
Return visit (30+ min)38$4,887$111
Subsequent hospital care with moderate levelof medical decision making at least 35 minutes23$3,500$67
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes30$3,425$110
Long return visit (40+ min)19$3,123$164
Short return visit (20+ min)19$1,710$81
New patient visit (30+ min)12$1,269$106
Short return visit19$992$52

Procedures Medicare counted

Procedure volume Medicare published
Coronary artery bypass graft (CABG)1-10None
Hernia repair - groin (open)11More than 90% of doctors who do this
Hernia repair (minimally invasive)41More than 97% of doctors who do this
Removal of skin lesions1-10None
Upper gastrointestinal (GI) endoscopy for acid reflux1-10None

Who their Medicare patients are

241 Original Medicare patients in 2024. Average age 74 · Under 65 8% · 85 and older 12% · Women 44% · Also on Medicaid 22% · Health risk score 1.30. At or below the middle of the specialty; the typical general surgery clinician is at 1.69.

Conditions among them: High blood pressure 75% · Chronic kidney disease 38% · Coronary heart disease 26% · Diabetes 25% · Cancer 20% · Atrial fibrillation 20% · Depression 19% · COPD 18% · Heart failure 15% · Dementia 7% · Stroke 7%.

The office billed $726,719, Medicare allowed $138,298 and paid $108,154; for 467 services of 49 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
2024241467741.30$726,719$108,154
2023193393741.34$443,520$88,598
2022222470731.41$560,959$116,389
2021250548731.64$559,637$113,860
2020203441721.71$543,728$107,437
2019239542731.52$602,131$122,490
2018201446711.49$477,469$97,699
2017172374731.61$401,236$81,443
2016171439731.66$403,444$89,438
2015160356731.73$279,774$73,485
2014170415711.52$314,951$98,772
2013193431721.47$270,295$89,595

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
New patient visit (45+ min)92$13,848$151
Repair of groin hernia using an endoscope26$12,190$469
Removal of gallbladder using an endoscope20$11,418$571
Return visit (30+ min)39$4,400$107
Subsequent hospital care with moderate levelof medical decision making at least 35 minutes16$3,016$70
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes24$2,760$115
Long return visit (40+ min)16$2,403$150
Short return visit (20+ min)22$1,823$70
Short return visit12$925$54

2022: 10 services

Original Medicare services billed in 2022
Repair of groin hernia using an endoscope33$15,442$468
New patient visit (45+ min)91$12,548$138
Removal of gallbladder using an endoscope18$9,969$554
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes44$4,884$109
Subsequent hospital care with moderate levelof medical decision making at least 35 minutes29$4,479$61
Repair of trapped hernia at navel (5 years or older)12$4,241$353
Return visit (30+ min)31$3,955$110
Placement of mesh to repair incisional or abdominal hernia12$2,695$225
Short return visit (20+ min)18$1,393$77
New patient visit (30+ min)16$1,311$82

2021: 7 services

Original Medicare services billed in 2021
Removal of gallbladder using an endoscope26$15,460$595
New patient visit (45+ min)78$11,486$147
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes69$8,859$123
Repair of groin hernia using an endoscope20$8,706$435
Subsequent hospital care with moderate levelof medical decision making at least 35 minutes50$8,414$63
Return visit (30+ min)28$3,367$116
Short return visit (20+ min)21$1,728$69

2020: 9 services

Original Medicare services billed in 2020
Removal of gallbladder using an endoscope28$15,819$565
Repair of groin hernia using an endoscope23$10,775$468
New patient visit (45+ min)58$8,046$139
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes45$5,543$123
Subsequent hospital care with moderate levelof medical decision making at least 35 minutes37$5,241$66
Long return visit (40+ min)16$2,331$137
Return visit (30+ min)17$2,302$105
New patient visit (30+ min)24$2,253$94
Short return visit (20+ min)21$1,424$59

2019: 8 services

Original Medicare services billed in 2019
Removal of gallbladder using an endoscope20$10,678$534
Repair of groin hernia using an endoscope25$10,546$422
New patient visit (45+ min)63$9,107$145
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes61$8,117$121
Subsequent hospital care with moderate levelof medical decision making at least 35 minutes41$7,714$65
Return visit (30+ min)27$2,633$91
New patient visit (30+ min)28$2,429$87
Short return visit (20+ min)26$1,956$59

2018: 8 services

Original Medicare services billed in 2018
Subsequent hospital care with moderate levelof medical decision making at least 35 minutes44$6,533$65
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes49$6,048$119
New patient visit (45+ min)38$5,189$137
Partial removal of stomach for weight loss using an endoscope12$4,989$416
Repair of groin hernia using an endoscope11$4,825$439
New patient visit (30+ min)23$2,133$93
Return visit (30+ min)17$1,806$90
Short return visit (20+ min)16$1,282$53

2017: 8 services

Original Medicare services billed in 2017
Repair of groin hernia using an endoscope13$5,890$453
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes46$5,678$118
Subsequent hospital care with moderate levelof medical decision making at least 35 minutes27$4,392$63
New patient visit (45+ min)25$3,531$141
Return visit (30+ min)29$2,950$95
New patient visit (60+ min)12$2,171$181
New patient visit (30+ min)24$2,119$88
Short return visit (20+ min)17$1,439$65

2016: 7 services

Original Medicare services billed in 2016
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes66$8,322$117
Subsequent hospital care with moderate levelof medical decision making at least 35 minutes40$6,572$62
Repair of groin hernia using an endoscope11$4,980$453
Return visit (30+ min)38$3,851$94
New patient visit (30+ min)28$2,501$89
New patient visit (45+ min)14$2,038$146
Short return visit (20+ min)23$1,919$56

2015: 8 services

Original Medicare services billed in 2015
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes46$5,769$118
Subsequent hospital care with moderate levelof medical decision making at least 35 minutes29$4,744$62
New patient visit (45+ min)25$3,480$139
New patient visit (60+ min)13$2,255$173
New patient visit (30+ min)23$2,159$94
Short return visit (20+ min)25$1,935$51
Return visit (30+ min)19$1,881$90
Long return visit (40+ min)12$1,438$120

2014: 10 services

Original Medicare services billed in 2014
Partial removal of stomach for weight loss using an endoscope12$9,961$830
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes54$6,470$118
Removal of gallbladder using an endoscope13$6,397$492
Subsequent hospital care with moderate levelof medical decision making at least 35 minutes27$4,827$62
Long return visit (40+ min)19$2,382$104
New patient visit (60+ min)12$2,055$171
Short return visit (20+ min)29$2,019$55
New patient visit (45+ min)15$1,954$130
Return visit (30+ min)21$1,823$87
New patient visit (30+ min)11$1,027$93

2013: 11 services

Original Medicare services billed in 2013
Removal of gallbladder using an endoscope14$7,232$517
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes55$6,302$115
Repair of groin hernia using an endoscope14$5,809$415
Removal of gallbladder with x-ray study of bile ducts using an endoscope11$5,684$517
Subsequent hospital care with moderate levelof medical decision making at least 35 minutes34$5,088$59
New patient visit (45+ min)25$3,611$144
New patient visit (60+ min)20$3,274$164
Return visit (30+ min)29$3,066$90
Long return visit (40+ min)15$1,917$120
New patient visit (30+ min)16$1,498$94
Short return visit (20+ min)14$950$56

Drugs they prescribed that Part D paid

$2,089

Pharmacies billed $2,089 in 2024.

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

Opioids were 60% of their Part D prescriptions (83 of 138) in 2024. Above the middle of the specialty; the typical general surgery clinician is at 34%.

130 generic and fewer than 11 brand-name prescriptions · $2,089 in drug cost · 16 antibiotic prescriptions.

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
Hydrocodone-Acetaminophen70$456$7
Pantoprazole11$271$25

Year by year

Part D prescribing by year
20241389660% (83)None$2,089
20231277860% (76)None$2,048
20221027063% (64)None$1,847
20211055650% (52)None$4,151
20201526849% (74)None$3,630
2019985036% (35)None$4,371
20181384227% (37)17%$8,212
2017913636% (33)18%$6,423
2016823937% (30)None$3,185
2015973531% (30)None$3,110
20141193533% (39)17%$6,052
20131054542% (44)19%$5,714

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
Hydrocodone-Acetaminophen64$371$6

2022: 1 drug

Part D drugs prescribed in 2022
Hydrocodone-Acetaminophen54$320$6

2021: 2 drugs

Part D drugs prescribed in 2021
Hydrocodone-Acetaminophen45$246$5
Omeprazole11$91$8

2020: 2 drugs

Part D drugs prescribed in 2020
Hydrocodone-Acetaminophen57$314$6
Omeprazole20$232$12

2019: 2 drugs

Part D drugs prescribed in 2019
Omeprazole17$272$16
Hydrocodone-Acetaminophen31$152$5

2018: 5 drugs

Part D drugs prescribed in 2018
Travasol13$1,993$153
Pantoprazole19$307$16
Omeprazole19$220$12
Hydrocodone-Acetaminophen33$195$6
Metoclopramide13$92$7

2017: 2 drugs

Part D drugs prescribed in 2017
Hydrocodone-Acetaminophen29$349$12
Omeprazole15$205$14

2016: 2 drugs

Part D drugs prescribed in 2016
Hydrocodone-Acetaminophen28$373$13
Omeprazole11$131$12

2015: 4 drugs

Part D drugs prescribed in 2015
Ursodiol12$1,812$151
Hydrocodone-Acetaminophen29$568$20
Omeprazole14$103$7
Metoclopramide19$92$5

2014: 3 drugs

Part D drugs prescribed in 2014
Hydrocodone-Acetaminophen33$1,397$42
Omeprazole20$138$7
Metoclopramide16$88$5

2013: 1 drug

Part D drugs prescribed in 2013
Hydrocodone-Acetaminophen39$390$10

Money from drug and device companies

$55 in 2023

Industry payments by year
202311None$55
202224None$256
202127None$3,295
202012None$44
201917None$263

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
MedtronicLigasure$55
1 payment
  • Meals for Ligasure · 2023-08-14 · $55
See the published payment
Every published payment
MedtronicMeals · 2023-08-14Ligasure$55
See earlier years (2022, 2021, 2020, 2019)

2022: $256

Payments by company in 2022
MedtronicSignia$158
3 payments
  • Meals for Signia · 2022-06-01 · $36
  • Meals for Ligasure · 2022-03-21 · $40
  • Meals for Signia · 2022-01-03 · $82
Intuitive SurgicalDa Vinci Surgical System$99
1 payment
  • Meals for Da Vinci Surgical System · 2022-11-15 · $99

2021: $3,295

Payments by company in 2021
Intuitive SurgicalDa Vinci Surgical System$3,170
4 payments
  • Meals for Da Vinci Surgical System · 2021-12-07 · $18
  • Education for Da Vinci Surgical System · 2021-10-26 · $3,000
  • Meals for Da Vinci Surgical System · 2021-10-05 · $44
  • Meals for Da Vinci Surgical System · 2021-06-17 · $107
MedtronicLigasure$125
3 payments
  • Meals for Dextile · 2021-10-04 · $13
  • Meals for Ligasure · 2021-09-13 · $70
  • Meals for Sonicision · 2021-04-08 · $42

2020: $44

Payments by company in 2020
Covidien LPSignia$44
2 payments
  • Meals for Signia · 2020-12-14 · $24
  • Meals for Signia · 2020-08-10 · $20

2019: $263

Payments by company in 2019
Intuitive SurgicalDa Vinci Surgical System$263
7 payments
  • Meals for Da Vinci Surgical System · 2019-12-24 · $15
  • Meals for Da Vinci Surgical System · 2019-12-24 · $21
  • Meals for Da Vinci Surgical System · 2019-12-24 · $15
  • Meals for Da Vinci Surgical System · 2019-12-24 · $21
  • Meals for Da Vinci Surgical System · 2019-12-05 · $139
  • Meals for Da Vinci Surgical System · 2019-10-09 · $51
  • Education for Da Vinci Surgical System · 2019-10-09 · $3

Professional record

NPI
1306864897
Licence
CA A70226California A70226: Current · expires 2027-04-30
Video visits
Lists video visits
Gender
Male
More record details
Sole proprietor
No
Taxonomy
Surgery (208600000X)
Mailing address
300 Pasteur Dr, Palo Alto, CA, 94304
NPI first listed
2006-07-17
NPI last updated
2024-04-27
NPI record certified
2024-04-27

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