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Mardi R Karin, MD

General Surgery · Stanford

NPI 1275568388

Medicare standing
Clear
Enrolled, allowed to bill and order, not excluded
Plans that list them
18
4 carriers
Office
1

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

18 plans · 4 carriers

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

18 of 18 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
Anthem Full Dual Advantage Aligned (HMO D-SNP)Anthem Blue CrossListedOct 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 G68578 · Current

Licensed to practise in California · since 1990 · expires 2027-11-30 · University of California, Los Angeles School of Medicine.

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

Surgery centers they own

  • Knowles Surgery Center, LLCAmbulatory Surgery Center · Los Gatos, CA5.2% owner since 2012 · accredited by AAAASF
    Probation3 inspections, 2 with deficiencies · last 2017-05-23: Requirements Met

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

$67,246

Medicare paid this office $67,246 for 118 people.

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

Largest Original Medicare bills
Partial removal of breast33$23,990$600
New patient visit (60+ min)50$7,923$158
Return visit (30+ min)72$7,597$82
Long return visit (40+ min)41$6,697$129
Biopsy or removal of deep lymph nodes of underarm25$5,211$208
See all 7 services
Every Original Medicare service billed
Partial removal of breast33$23,990$600
New patient visit (60+ min)50$7,923$158
Return visit (30+ min)72$7,597$82
Long return visit (40+ min)41$6,697$129
Biopsy or removal of deep lymph nodes of underarm25$5,211$208
Imaging of lymph nodes during surgery26$3,125$120
New patient visit (45+ min)12$1,257$105

Procedures Medicare counted

Procedure volume Medicare published
Mastectomy59More than 96% of doctors who do this
Melanoma (skin cancer) excision1-10None
Skin biopsy1-10None

Who their Medicare patients are

118 Original Medicare patients in 2024. Average age 75 · Also on Medicaid 11% · Health risk score 0.90. At or below the middle of the specialty; the typical general surgery clinician is at 1.69.

Conditions among them: Cancer 75% · High blood pressure 62% · Diabetes 22% · Coronary heart disease 16% · Atrial fibrillation 14% · Depression 14% · Chronic kidney disease 11%.

The office billed $297,461, Medicare allowed $86,054 and paid $67,246; for 330 services of 20 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
2024118330750.90$297,461$67,246
2023168456740.99$484,997$91,482
2022141397740.88$388,265$80,479
2021120393731.08$401,540$78,693
202094295730.89$352,495$64,394
201995277721.03$181,920$44,736
201895242740.93$121,744$35,526
2017109288740.96$202,278$40,131
201698269731.03$181,363$37,836
2015119445741.27$302,135$72,420
2014120433741.26$296,796$65,352
2013116446751.11$317,376$73,474

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
Partial removal of breast45$30,280$618
Return visit (30+ min)109$11,097$80
Long return visit (40+ min)44$7,624$121
Biopsy or removal of deep lymph nodes of underarm33$7,170$211
New patient visit (60+ min)43$6,847$159
Removal of growth of breast identified by x-ray marker, first growth14$4,515$323
Imaging of lymph nodes during surgery36$4,513$122
New patient visit (45+ min)22$2,209$100
Short return visit (20+ min)14$781$56

2022: 6 services

Original Medicare services billed in 2022
Partial removal of breast26$18,544$618
Long return visit (40+ min)61$11,930$126
New patient visit (60+ min)55$9,052$165
Return visit (30+ min)80$7,872$78
Biopsy or removal of deep lymph nodes of underarm18$3,888$216
Imaging of lymph nodes during surgery21$2,577$123

2021: 7 services

Original Medicare services billed in 2021
Partial removal of breast33$23,877$628
Long return visit (40+ min)54$9,049$119
New patient visit (60+ min)47$8,075$172
Return visit (30+ min)69$7,469$84
Biopsy or removal of deep lymph nodes of underarm28$5,884$210
Removal of growth of breast identified by x-ray marker, first growth11$3,896$354
Imaging of lymph nodes during surgery29$3,589$124

2020: 7 services

Original Medicare services billed in 2020
Partial removal of breast26$21,007$618
New patient visit (60+ min)40$6,275$157
Long return visit (40+ min)39$5,878$101
Biopsy or removal of deep lymph nodes of underarm20$4,501$214
Return visit (30+ min)41$3,789$71
Imaging of lymph nodes during surgery21$2,645$126
Short return visit (20+ min)19$891$45

2019: 8 services

Original Medicare services billed in 2019
Partial removal of breast20$14,782$591
Biopsy or removal of deep lymph nodes of underarm20$3,984$199
New patient visit (60+ min)24$3,655$152
Return visit (30+ min)33$3,171$67
Short return visit (20+ min)53$2,952$41
Imaging of lymph nodes during surgery23$2,749$120
Long return visit (40+ min)17$2,423$93
New patient visit (45+ min)13$1,516$117

2018: 8 services

Original Medicare services billed in 2018
Partial removal of breast14$9,208$575
Short return visit (20+ min)61$3,284$38
Biopsy or removal of deep lymph nodes of underarm13$2,740$211
Return visit (30+ min)25$2,472$67
New patient visit (60+ min)14$2,107$151
Long return visit (40+ min)14$2,004$95
Imaging of lymph nodes during surgery15$1,818$121
New patient visit (45+ min)11$1,153$105

2017: 8 services

Original Medicare services billed in 2017
Partial removal of breast17$10,656$533
Short return visit (20+ min)69$3,777$39
Return visit (30+ min)34$2,834$62
New patient visit (60+ min)18$2,706$150
Biopsy or removal of deep lymph nodes of underarm11$2,344$213
Long return visit (40+ min)16$1,993$91
Imaging of lymph nodes during surgery15$1,767$118
New patient visit (45+ min)13$1,431$110

2016: 7 services

Original Medicare services billed in 2016
Partial removal of breast14$10,568$587
Short return visit (20+ min)59$4,066$44
Return visit (30+ min)41$3,486$67
New patient visit (60+ min)14$2,255$161
Long return visit (40+ min)15$1,474$87
New patient visit (45+ min)12$1,327$111
New patient visit (30+ min)12$798$67

2015: 8 services

Original Medicare services billed in 2015
Partial removal of breast13$8,271$551
Return visit (30+ min)51$7,994$95
Short return visit (20+ min)67$7,849$64
New patient visit (60+ min)43$7,685$179
Long return visit (40+ min)32$6,596$129
Biopsy or removal of deep lymph nodes of underarm13$2,530$195
Imaging of lymph nodes during surgery14$1,646$118
Injection of radioactive material for x-ray identification of lymph node14$264$19

2014: 8 services

Original Medicare services billed in 2014
Short return visit (20+ min)77$8,058$64
Partial removal of breast13$7,467$498
New patient visit (60+ min)36$6,446$179
Return visit (30+ min)39$5,728$89
Long return visit (40+ min)24$5,203$130
Biopsy or removal of deep lymph nodes of underarm13$2,521$194
Imaging of lymph nodes during surgery11$1,291$117
Injection of radioactive material for x-ray identification of lymph node11$209$19

2013: 8 services

Original Medicare services billed in 2013
Short return visit (20+ min)58$8,790$65
Partial removal of breast12$8,401$560
New patient visit (60+ min)39$7,101$182
Long return visit (40+ min)27$7,019$132
Return visit (30+ min)39$4,812$93
Biopsy or removal of deep lymph nodes of underarm13$2,540$195
Imaging of lymph nodes during surgery13$1,499$115
Injection of radioactive material for x-ray identification of lymph node11$208$19

Drugs they prescribed that Part D paid

$65

Pharmacies billed $65 in 2024.

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

Opioids were 91% of their Part D prescriptions (21 of 23) in 2024. Too few prescriptions to compare fairly with other clinicians.

23 generic and 0 brand-name prescriptions · $65 in drug cost.

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
Tramadol17$21$1

Year by year

Part D prescribing by year
2024232091% (21)0%$65
2023352797% (34)0%$94
2022161588% (14)0%$66
2021332694% (31)0%$58
2020231583% (19)0%$59
201811NoneNoneNone$105
2017231557% (13)0%$154
201611NoneNoneNone$86
2015622632% (20)None$948
20142004219% (38)None$8,391
20132364314% (32)None$13,244

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
Tramadol32$40$1

2022: 1 drug

Part D drugs prescribed in 2022
Tramadol12$12$1

2021: 1 drug

Part D drugs prescribed in 2021
Tramadol31$36$1

2020: 1 drug

Part D drugs prescribed in 2020
Tramadol18$27$1

2015: 1 drug

Part D drugs prescribed in 2015
Hydrocodone-Acetaminophen15$168$11

2014: 4 drugs

Part D drugs prescribed in 2014
Hydrocodone-Acetaminophen24$432$18
Omeprazole21$222$11
Sertraline12$61$5
Meloxicam12$44$4

2013: 5 drugs

Part D drugs prescribed in 2013
Nabumetone15$452$30
Hydrocodone-Acetaminophen19$391$21
Omeprazole11$151$14
Lisinopril16$107$7
Pravastatin11$59$5

Money from drug and device companies

$356 in 2025

Industry payments by year
202544None$356
202311None$91
202211None$136
202112None$193
202011None$125
201922None$225

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
AbbvieNatrelle Saline-Filled Breast Implants$147
1 payment
  • Meals for Natrelle Saline-Filled Breast Implants · 2025-12-16 · $147
InSightecExablate$143
1 payment
  • Meals for Exablate · 2025-08-26 · $143
Urgo Medical North AmericaVashe Wound Solution 250 Ml (8.5 Fl Oz) Flip Top Cap$37
1 payment
  • Meals for Vashe Wound Solution 250 Ml (8.5 Fl Oz) Flip Top Cap · 2025-10-08 · $37
Solventum3m Duraprep Surgical$29
1 payment
  • Meals for 3m Duraprep Surgical · 2025-06-16 · $29
See all 4 published payments
Every published payment
AbbvieMeals · 2025-12-16Natrelle Saline-Filled Breast Implants$147
Urgo Medical North AmericaMeals · 2025-10-08Vashe Wound Solution 250 Ml (8.5 Fl Oz) Flip Top Cap$37
InSightecMeals · 2025-08-26Exablate$143
SolventumMeals · 2025-06-163m Duraprep Surgical$29
See earlier years (2023, 2022, 2021, 2020, 2019)

2023: $91

Payments by company in 2023
MedtronicPercept PC Brainsense$91
1 payment
  • Meals for Percept PC Brainsense · 2023-05-03 · $91

2022: $136

Payments by company in 2022
SientraSientra High Strength Cohesive Silicone Gel Breast Implant$136
1 payment
  • Meals for Sientra High Strength Cohesive Silicone Gel Breast Implant · 2022-12-15 · $136

2021: $193

Payments by company in 2021
DavolPhasix$193
2 payments
  • Meals for Phasix · 2021-10-19 · $106
  • Meals for Phasix · 2021-10-19 · $87

2020: $125

Payments by company in 2020
GenzymeDupixent$125
1 payment
  • Meals for Dupixent · 2020-01-29 · $125

2019: $225

Payments by company in 2019
HologicBiozorb$156
1 payment
  • Meals for Biozorb · 2019-10-28 · $156
Novartis PharmaceuticalsNone$69
1 payment
  • Meals · 2019-03-29 · $69

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
1275568388
Licence
CA G68578California G68578: Current · expires 2027-11-30
Trained
University of California, Geffen School of Medicine, 1985
Video visits
Lists video visits
Gender
Female
More record details
Sole proprietor
Yes
Taxonomy
Surgery (208600000X); Federal specialty code 174400000X (174400000X)
Mailing address
300 Pasteur Dr, Palo Alto, CA, 94304
NPI first listed
2006-07-11
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.