Skip to main content
UniHealth

Doctor search

Lynn Ngo, MD

Internal Medicine · Stanford

NPI 1659303907

Medicare standing
Clear
Enrolled, allowed to bill and order, not excluded
Plans that list them
16
2 carriers
Office
1
Since medical school
38 years
Stanford University School of Medicine, 1988

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.

Plans that list them

16 plans · 2 carriers

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

16 of 16 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

California Medical Board record

Licence G66515 · Current

Licensed to practise in California · since 1989 · expires 2029-01-31 · 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 Internal Medicine - Internal Medicine

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.

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

$11,682

Medicare paid this office $11,682 for 118 people.

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

Largest Original Medicare bills
Return visit (30+ min)49$5,817$114
Short return visit (20+ min)31$2,377$77
New patient visit (30+ min)21$1,711$81

Who their Medicare patients are

118 Original Medicare patients in 2024. Average age 73 · Under 65 13% · 85 and older 13% · Women 65% · Also on Medicaid 30% · Health risk score 1.42. At or below the middle of the specialty; the typical internal medicine clinician is at 1.76.

Conditions among them: High blood pressure 69% · Diabetes 35% · Coronary heart disease 29% · Chronic kidney disease 22% · Cancer 20% · Depression 17% · Atrial fibrillation 14% · COPD 13% · Heart failure 10% · Stroke 10%.

The office billed $53,669, Medicare allowed $16,436 and paid $11,682; for 121 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.

Year by year

Original Medicare by year
2024118121731.42$53,669$11,682
2023106140741.19$65,313$10,126
2022163274721.27$104,333$18,641
2021126197741.63$75,668$13,601
2020168261721.35$95,626$14,552
2019135166721.23$108,136$11,428
2018155185731.42$91,652$12,053
2017151165741.60$46,869$10,962
2016145157721.56$25,916$7,319
20155058761.02$4,438$1,520
2014126346692.62$114,787$29,212
2013151481692.44$135,291$39,057

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: 3 services

Original Medicare services billed in 2023
Return visit (30+ min)38$4,541$116
Short return visit (20+ min)29$2,176$73
Telehealth originating site facility fee22$445$19

2022: 5 services

Original Medicare services billed in 2022
Return visit (30+ min)58$6,926$115
Short return visit (20+ min)58$5,074$83
New patient visit (30+ min)29$2,721$94
Telehealth originating site facility fee99$2,165$21
New patient visit (15+ min)12$704$59

2021: 4 services

Original Medicare services billed in 2021
Return visit (30+ min)48$5,915$121
Short return visit (20+ min)34$2,937$86
Telehealth originating site facility fee56$1,081$19
New patient visit (30+ min)12$909$76

2020: 4 services

Original Medicare services billed in 2020
Return visit (30+ min)49$4,189$84
Short return visit (20+ min)51$3,016$59
Telehealth originating site facility fee83$1,808$22
Return visit (30+ min)18$1,295$72

2019: 3 services

Original Medicare services billed in 2019
Return visit (30+ min)94$8,094$81
Short return visit (20+ min)21$1,345$58
New patient visit (30+ min)12$815$68

2018: 2 services

Original Medicare services billed in 2018
Return visit (30+ min)133$10,276$70
New patient visit (30+ min)17$1,085$64

2017: 3 services

Original Medicare services billed in 2017
Return visit (30+ min)87$7,310$83
Short return visit (20+ min)39$1,505$39
New patient visit (30+ min)21$1,442$69

2016: 3 services

Original Medicare services billed in 2016
Short return visit (20+ min)91$3,780$40
Return visit (30+ min)30$1,894$63
New patient visit (15+ min)11$391$36

2015: 2 services

Original Medicare services billed in 2015
Short return visit (20+ min)12$547$46
Urinalysis, manual test14$61$3

2014: 5 services

Original Medicare services billed in 2014
Initial hospital care with moderate level of medical decision making at least 75 minutes54$8,786$163
Subsequent hospital care with moderate levelof medical decision making at least 35 minutes49$8,479$63
Subsequent hospital care with moderate levelof medical decision making at least 50 minutes27$4,991$92
Hospital discharge day management, more than 30 minutes22$2,124$97
Hospital discharge day management, 30 minutes or less22$1,441$65

2013: 5 services

Original Medicare services billed in 2013
Subsequent hospital care with moderate levelof medical decision making at least 35 minutes85$16,029$62
Initial hospital care with moderate level of medical decision making at least 75 minutes75$13,238$174
Hospital discharge day management, 30 minutes or less54$3,466$63
Hospital discharge day management, more than 30 minutes13$1,239$95
Aspiration and/or injection of fluid from large joint14$977$61

Medicaid work

$914 in 2022

Medicaid paid $914 for 35 billed services this clinician did in 2022, up to 20 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 2022
Telehealth originating site facility fee22$480
Return visit (30+ min)13$434
Medicaid work by year
202235220$914
202165214$1,033
202014114$220
201812112$345
See the largest Medicaid services in earlier years

2021

Largest Medicaid services in 2021
Telehealth originating site facility fee38$714
Return visit (30+ min)27$319

2020

Largest Medicaid services in 2020
Telehealth originating site facility fee14$220

2018

Largest Medicaid services in 2018
Return visit (30+ min)12$345

Drugs they prescribed that Part D paid

$3,804

Pharmacies billed $3,804 in 2024.

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

Opioids were 0% of their Part D prescriptions (0 of 87) in 2024. At or below the middle of the specialty; the typical internal medicine clinician is at 1%.

72 generic and 15 brand-name prescriptions · $3,804 in drug cost · 21 antibiotic prescriptions to 21 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.

Year by year

Part D prescribing by year
202487640% (0)17%$3,804
20236044NoneNone$1,169
202210475NoneNone$3,794
20218866NoneNone$1,574
20209769None12%$1,885
201911376None20%$2,801
2018179102None22%$7,220
2017279124NoneNone$6,689
20161,0902131% (11)11%$37,158
20152,3002503% (70)15%$92,648
20145261888% (40)None$30,850
20136041533% (15)21%$39,103

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

See the drugs prescribed each year

2021: 1 drug

Part D drugs prescribed in 2021
Triamcinolone Acetonide11$127$12

2019: 2 drugs

Part D drugs prescribed in 2019
Azithromycin14$102$7
Prednisone11$39$4

2018: 4 drugs

Part D drugs prescribed in 2018
Ventolin Hfa12$659$55
Azithromycin24$136$6
Triamcinolone Acetonide11$118$11
Prednisone12$47$4

2017: 5 drugs

Part D drugs prescribed in 2017
Enalapril Maleate14$364$26
Amlodipine Besylate17$150$9
Benazepril12$80$7
Alendronate11$79$7
Azithromycin12$76$6

2016: 25 drugs

Part D drugs prescribed in 2016
Tamsulosin46$2,672$58
Acarbose17$1,904$112
Amlodipine Besylate129$945$7
Alendronate84$763$9
Levothyroxine21$648$31
Losartan57$618$11
Finasteride29$545$19
Atorvastatin33$507$15
Pravastatin21$386$18
Hydrochlorothiazide53$326$6
Metoprolol13$267$21
Simvastatin43$263$6
Triamcinolone Acetonide15$252$17
Benazepril18$239$13
Omeprazole37$236$6
Fluticasone Propionate22$222$10
Metformin27$212$8
Donepezil17$192$11
Glipizide17$183$11
Gabapentin15$157$10
Clopidogrel12$126$10
Atenolol25$124$5
Metoprolol17$122$7
Lisinopril14$93$7
Azithromycin12$92$8

2015: 45 drugs

Part D drugs prescribed in 2015
Zostavax28$5,274$188
Lantus14$4,492$321
Avodart13$4,299$331
Combivent Respimat12$3,559$297
Premarin12$3,071$256
Tamsulosin60$3,063$51
Econazole Nitrate13$2,974$229
Acarbose13$1,942$149
Pravastatin59$1,659$28
Isosorbide Dinitrate13$1,650$127
Amlodipine Besylate214$1,642$8
Losartan99$1,466$15
Alendronate111$1,358$12
Atorvastatin51$1,187$23
Metoprolol37$995$27
Triamcinolone Acetonide75$993$13
Valsartan19$986$52
Gabapentin59$940$16
Levothyroxine36$910$25
Proair Hfa15$903$60
Finasteride45$867$19
Potassium Chloride15$762$51
Fluticasone Propionate56$717$13
Omeprazole75$712$9
Metformin81$698$9
Mirtazapine18$489$27
Hydrochlorothiazide90$487$5
Metoprolol50$460$9
Simvastatin62$431$7
Atenolol66$424$6
Acetaminophen-Codeine33$375$11
Donepezil23$343$15
Benazepril28$336$12
Losartan-Hydrochlorothiazide26$287$11
Isosorbide Mononitrate Er18$269$15
Tramadol28$233$8
Clonidine21$230$11
Glipizide18$210$12
Meclizine20$199$10
Clopidogrel18$196$11
Trazodone38$191$5
Allopurinol11$168$15
Lisinopril29$158$5
Carvedilol12$136$11
Zolpidem18$88$5

2014: 14 drugs

Part D drugs prescribed in 2014
Zostavax23$4,234$184
Hydrocodone-Acetaminophen18$588$33
Pravastatin12$326$27
Gabapentin13$247$19
Amlodipine Besylate26$202$8
Losartan12$199$17
Omeprazole16$193$12
Fluticasone Propionate12$178$15
Metformin11$160$15
Pantoprazole11$144$13
Atenolol15$128$9
Hydrochlorothiazide15$101$7
Metoprolol12$83$7
Furosemide11$43$4

2013: 13 drugs

Part D drugs prescribed in 2013
Flovent Hfa11$3,160$287
Simvastatin33$338$10
Atenolol48$330$7
Alendronate17$328$19
Losartan15$327$22
Fluticasone Propionate11$282$26
Amlodipine Besylate25$276$11
Omeprazole14$242$17
Metformin13$196$15
Gabapentin15$185$12
Metoprolol18$163$9
Furosemide17$91$5
Hydrochlorothiazide17$62$4

Money from drug and device companies

$21 in 2025

A payment is not proof that care is biased.

Payments by company
AbbvieSynthroid$21
1 payment
  • Meals for Synthroid · 2025-04-01 · $21
See the published payment
Every published payment
AbbvieMeals · 2025-04-01Synthroid$21

Professional record

NPI
1659303907
Licence
CA G66515California G66515: Current · expires 2029-01-31
Trained
Stanford University School of Medicine, 1988 · 38 years ago
Video visits
Lists video visits
Gender
Female
More record details
Sole proprietor
No
Medicaid ID
CA 00G665150
Taxonomy
Internal medicine (207R00000X)
Mailing address
300 Pasteur Dr, Stanford, CA, 94305
NPI first listed
2006-07-07
NPI last updated
2024-04-22
NPI record certified
2024-04-22

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