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Euna Baughn Koo, MD

Ophthalmology · Palo Alto

NPI 1275832768

Medicare standing
Clear
Enrolled, allowed to bill and order, not excluded
Plans that list them
17
3 carriers
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.

Plans that list them

17 plans · 3 carriers

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

17 of 17 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
Alignment Health Silicon (HMO C-SNP)Alignment Health PlanListedOct 3, 2026
Alignment Health smartHMO (HMO)Alignment Health PlanListedOct 3, 2026
Alignment Health the ONE (HMO)Alignment Health PlanListedOct 3, 2026
SCAN Balance (HMO C-SNP)SCAN Health PlanListedOct 3, 2026
SCAN Classic (HMO)SCAN Health PlanListedOct 3, 2026
SCAN MyChoice (HMO)SCAN Health PlanListedOct 3, 2026
SCAN Strive (HMO C-SNP)SCAN Health PlanListedOct 3, 2026
DualConnect (HMO D-SNP)Santa Clara Family Health PlanListedSep 1, 2026

California Medical Board record

Licence A123115 · Current

Licensed to practise in California · since 2012 · expires 2026-10-31 · University of Florida College 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

$12,056

Medicare paid this office $12,056 for 56 people.

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

Largest Original Medicare bills
Return visit (30+ min)25$1,886$75
Exam to measure eye deviation and range of motion31$972$29
Short return visit (20+ min)11$655$60

Who their Medicare patients are

56 Original Medicare patients in 2024. Average age 74 · Women 61% · Also on Medicaid 23% · Health risk score 1.46. Above the middle of the specialty; the typical ophthalmology clinician is at 1.16.

Conditions among them: High blood pressure 63% · Chronic kidney disease 34% · Coronary heart disease 32% · Diabetes 27% · Atrial fibrillation 25% · Depression 21%.

The office billed $89,306, Medicare allowed $16,164 and paid $12,056; for 113 services of 16 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
202456113741.46$89,306$12,056
202352126760.81$200,029$23,675
202246147701.09$77,486$13,644
20213887720.95$47,397$8,674
202041106731.18$67,923$10,429
20193991691.40$34,936$7,056
201841121721.21$79,914$12,256
20172382652.07$85,923$10,987
20161116602.10$2,960$890

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: 1 service

Original Medicare services billed in 2023
Exam to measure eye deviation and range of motion27$1,118$33

2022: 3 services

Original Medicare services billed in 2022
Return visit (30+ min)18$1,653$87
Exam to measure eye deviation and range of motion32$1,300$30
Short return visit (20+ min)18$950$43

2021: 2 services

Original Medicare services billed in 2021
Short return visit (20+ min)18$1,062$53
Exam to measure eye deviation and range of motion25$969$35

2020: 3 services

Original Medicare services billed in 2020
Exam to measure eye deviation and range of motion30$1,217$33
Return visit (30+ min)15$1,001$63
Short return visit (20+ min)17$909$43

2019: 3 services

Original Medicare services billed in 2019
Return visit (30+ min)15$1,032$65
Exam to measure eye deviation and range of motion24$959$32
Short return visit (20+ min)17$759$33

2018: 2 services

Original Medicare services billed in 2018
Short return visit (20+ min)29$1,520$43
Exam to measure eye deviation and range of motion33$1,471$33

2017: 2 services

Original Medicare services billed in 2017
Short return visit (20+ min)21$1,116$43
Exam to measure eye deviation and range of motion16$576$32

Medicaid work

$13,985 in 2024

Medicaid paid $13,985 for 151 billed services this clinician did in 2024, up to 21 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
Short return visit (20+ min)107$9,267
Return visit (30+ min)29$3,104
OFFICE/OP CONSLTJ NEW/EST PT LOW MDM 30 MINUTES15$1,613
Medicaid work by year
2024151321$13,985
2023392445$26,659
2022395440$27,607
2021378447$23,121
2020466434$29,201
2019605446$41,108
2018642354$37,437
See the largest Medicaid services in earlier years

2023

Largest Medicaid services in 2023
Short return visit (20+ min)270$17,405
Return visit (30+ min)44$3,966
OFFICE/OP CONSLTJ NEW/EST PT LOW MDM 30 MINUTES31$2,881
SENSORIMOTOR EXAMINATION47$2,406

2022

Largest Medicaid services in 2022
Short return visit (20+ min)272$16,877
Return visit (30+ min)79$6,997
OFFICE/OP CONSLTJ NEW/EST PT LOW MDM 30 MINUTES31$2,974
SENSORIMOTOR EXAMINATION13$759

2021

Largest Medicaid services in 2021
Short return visit (20+ min)253$14,394
OFFICE/OP CONSLTJ NEW/EST PT LOW MDM 30 MINUTES45$3,972
SENSORIMOTOR EXAMINATION67$3,731
Return visit (30+ min)13$1,024

2020

Largest Medicaid services in 2020
Short return visit (20+ min)286$14,986
OFFICE/OP CONSLTJ NEW/EST PT LOW MDM 30 MINUTES65$6,055
Return visit (30+ min)68$5,522
SENSORIMOTOR EXAMINATION47$2,639

2019

Largest Medicaid services in 2019
Short return visit (20+ min)305$16,946
OFFICE/OP CONSLTJ NEW/EST PT LOW MDM 30 MINUTES132$13,653
SENSORIMOTOR EXAMINATION137$7,479
Return visit (30+ min)31$3,031

2018

Largest Medicaid services in 2018
Short return visit (20+ min)511$26,510
OFFICE/OP CONSLTJ NEW/EST PT LOW MDM 30 MINUTES86$8,652
SENSORIMOTOR EXAMINATION45$2,275

Money from drug and device companies

$5,817 in 2025

Industry payments by year
202533$5,490$5,817
202424None$389

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
SpringWorks TherapeuticsGomekli$5,490
1 payment
  • Consulting for Gomekli · 2025-07-17 · $5,490
GlaukosPhotrexa Viscous and Photrexa$177
1 payment
  • Meals for Photrexa Viscous and Photrexa · 2025-03-11 · $177
Tarsus PharmaceuticalsNone$150
1 payment
  • Meals · 2025-10-18 · $150
See all 3 published payments
Every published payment
Tarsus PharmaceuticalsMeals · 2025-10-18None$150
SpringWorks TherapeuticsConsulting · 2025-07-17Gomekli$5,490
GlaukosMeals · 2025-03-11Photrexa Viscous and Photrexa$177
See earlier years (2024)

2024: $389

Payments by company in 2024
AmgenTepezza$288
3 payments
  • Meals for Tepezza · 2024-11-19 · $70
  • Meals for Tepezza · 2024-11-19 · $70
  • Meals for Tepezza · 2024-11-19 · $147
Tarsus PharmaceuticalsXdemvy$102
1 payment
  • Meals for Xdemvy · 2024-08-23 · $102

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
1275832768
Licence
CA A123115, MA 261930California A123115: Current · expires 2026-10-31
Trained
University of Florida College of Medicine, 2011
Gender
Female
More record details
Sole proprietor
No
Taxonomy
Federal specialty code 207WX0110X (207WX0110X); Federal specialty code 207W00000X (207W00000X)
Mailing address
1804 Embarcadero Rd, Suite 100, Palo Alto, CA, 94303
NPI first listed
2011-03-23
NPI last updated
2024-04-04
NPI record certified
2024-04-04

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

Extra NPI addresses: 300 Pasteur Dr, Stanford, CA, 94305