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Christian A Kunder, MD

Pathology · Stanford

NPI 1083931489

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
4

Offices

4 locations · Stanford Health Care · Calpath Medical Associates

Looking this up.

Hospitals listed: Good Samaritan Hospital. 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. Kunder’s office to ask if they take your plan before you enroll.

California Medical Board record

Licence A117953 · Current

Licensed to practise in California · since 2011 · expires 2027-07-31 · Duke University School 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.

  • Good Samaritan HospitalSan Jose, CAAcute Care Hospital · Proprietary · Has an emergency department · Birthing-friendlyPart of HCA Healthcare, which runs 185 hospitals in 19 statesPatients rate it 2 of 5 · 67% would definitely recommend it
    Overall rating: 2 of 5 starsBetter than the national rate — Clostridium Difficile (C.Diff): 0.337, Oct 2024 – Sep 2025
See every measure and the patient survey for Good Samaritan Hospital

Behind the star rating — Deaths: 0 better, 8 the same, 0 worse of 8 measures. Safety: 1 better, 6 the same, 1 worse of 8 measures. Readmissions: 0 better, 5 the same, 4 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 Good Samaritan Hospital
Clostridium Difficile (C.Diff)Infections0.337BetterOct 2024 – Sep 2025
Abdominopelvic accidental puncture or laceration rateComplications and deaths0.75 (0 to 1.67) · 1,340 casesNo differentJul 2022 – Jun 2024
CMS Medicare PSI 90: Patient safety and adverse events compositeComplications and deaths0.84 (0.54 to 1.14)No differentJul 2022 – Jun 2024
Death rate among surgical inpatients with serious treatable complicationsComplications and deaths143.59 (98.7 to 188.49) · 98 casesNo differentJul 2022 – Jun 2024
Death rate for CABG surgery patientsComplications and deaths1.7 · 45 casesNoneJul 2022 – Jun 2025
Death rate for COPD patientsComplications and deaths7.1 · 100 casesNoneJul 2022 – Jun 2025
Death rate for heart attack patientsComplications and deaths12.7 · 270 casesNoneJul 2022 – Jun 2025
Death rate for heart failure patientsComplications and deaths11.3 · 573 casesNoneJul 2022 – Jun 2025
Death rate for pneumonia patientsComplications and deaths15.6 · 820 casesNoneJul 2022 – Jun 2025
Death rate for stroke patientsComplications and deaths8.5 · 482 casesNoneJul 2023 – Jun 2025
Hybrid Hospital-Wide All-Cause Risk Standardized Mortality RateComplications and deaths3.3 · 3,711 casesNoneJul 2024 – Jun 2025
Iatrogenic pneumothorax rateComplications and deaths0.12 (0 to 0.3) · 8,866 casesNo differentJul 2022 – Jun 2024
In-hospital fall-associated fracture rateComplications and deaths0.2 (0.01 to 0.38) · 9,051 casesNo differentJul 2022 – Jun 2024
Perioperative pulmonary embolism or deep vein thrombosis rateComplications and deaths2.65 (0.74 to 4.56) · 1,929 casesNo differentJul 2022 – Jun 2024
Postoperative acute kidney injury requiring dialysis rateComplications and deaths1.8 (0.21 to 3.39) · 670 casesNo differentJul 2022 – Jun 2024
Postoperative hemorrhage or hematoma rateComplications and deaths2.33 (0.88 to 3.78) · 1,836 casesNo differentJul 2022 – Jun 2024
Postoperative respiratory failure rateComplications and deaths6.73 (0 to 13.46) · 669 casesNo differentJul 2022 – Jun 2024
Postoperative sepsis rateComplications and deaths7.58 (3.96 to 11.19) · 654 casesNo differentJul 2022 – Jun 2024
Postoperative wound dehiscence rateComplications and deaths1.59 (0.13 to 3.04) · 496 casesNo differentJul 2022 – Jun 2024
Pressure ulcer rateComplications and deaths0.27 (0 to 0.87) · 7,373 casesNo differentJul 2022 – Jun 2024
Rate of complications for hip/knee replacement patientsComplications and deaths4.1 · 152 casesNoneApr 2023 – Mar 2025
Catheter Associated Urinary Tract Infections (ICU + select Wards)Infections1.08No differentOct 2024 – Sep 2025
Central Line Associated Bloodstream Infection (ICU + select Wards)Infections0.542No differentOct 2024 – Sep 2025
MRSA BacteremiaInfections0.484No differentOct 2024 – Sep 2025
SSI - Colon SurgeryInfections1.565No differentOct 2024 – Sep 2025
Acute Myocardial Infarction (AMI) 30-Day Readmission RateUnplanned return visits15.8 · 327 casesNoneJul 2023 – Jun 2025
Heart failure (HF) 30-Day Readmission RateUnplanned return visits24.2 · 703 casesNoneJul 2023 – Jun 2025
Hospital return days for heart attack patientsUnplanned return visits61.1 · 289 casesNoneJul 2022 – Jun 2025
Hospital return days for heart failure patientsUnplanned return visits36.3 · 665 casesNoneJul 2022 – Jun 2025
Hospital return days for pneumonia patientsUnplanned return visits25.4 · 856 casesNoneJul 2022 – Jun 2025
Pneumonia (PN) 30-Day Readmission RateUnplanned return visits19 · 978 casesNoneJul 2023 – Jun 2025
Rate of readmission after hip/knee replacementUnplanned return visits6.3 · 144 casesNoneJul 2023 – Jun 2025
Rate of readmission for CABGUnplanned return visits12.3 · 46 casesNoneJul 2023 – Jun 2025
Rate of readmission for chronic obstructive pulmonary disease (COPD) patientsUnplanned return visits21.2 · 135 casesNoneJul 2023 – Jun 2025
Rate of unplanned hospital visits after colonoscopy (per 1,000 colonoscopies)Unplanned return visits13.8 (10.1 to 18.6) · 129 casesNo differentJan 2022 – Dec 2024
Ratio of unplanned hospital visits after hospital outpatient surgeryUnplanned return visits1.2 (0.9 to 1.5) · 531 casesNo differentJan 2024 – Dec 2024

What patients said (704 patients answered, 24% of those asked)

Patient survey stars by topic at Good Samaritan Hospital
Cleanliness3
Nurse communication3
Doctor communication2
Communication about medicines2
Discharge information3
Overall hospital rating2
Quietness1
Recommend hospital3
Share of patients giving the best answer at Good Samaritan Hospital
Room was "always" clean66%
Nurses "always" communicated well75%
Doctors "always" communicated well71%
Staff "always" explained54%
Yes, staff "did" give patients this information83%
Yes, staff "did" give patients information about help after discharge81%
Doctors "always" explained things so they could understand66%
Doctors "always" listened carefully69%
Doctors "always" treated them with courtesy and respect78%
Patients who gave a rating of "9" or "10" (high)63%
Staff "always" explained new medications68%
Nurses "always" explained things so they could understand69%
Nurses "always" listened carefully73%
Nurses "always" treated them with courtesy and respect82%
"Always" quiet at night38%
"YES", patients would definitely recommend the hospital67%
Staff "always" explained possible side effects40%
Yes, staff "did" give patients information about possible symptoms86%

Original Medicare doctor bills

$202,727

Medicare paid this office $202,727 for 1,251 people.

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

Largest Original Medicare bills
Pathology examination of tissue using a microscope, intermediate complexity645$94,536$68
Pathology examination of tissue using a microscope, intermediate complexity245$14,572$34
Pathology examination of tissue using a microscope, moderately high complexity90$10,489$73
Pathology examination of tissue using a microscope, moderately high complexity21$9,954$284
Special stained specimen slides to examine tissue, each additional procedure33$8,666$84
See all 26 services
Every Original Medicare service billed
Pathology examination of tissue using a microscope, intermediate complexity645$94,536$68
Pathology examination of tissue using a microscope, intermediate complexity245$14,572$34
Pathology examination of tissue using a microscope, moderately high complexity90$10,489$73
Pathology examination of tissue using a microscope, moderately high complexity21$9,954$284
Special stained specimen slides to examine tissue, each additional procedure33$8,666$84
Microscopic genetic analysis of tumor, manual25$7,990$118
Special stained specimen slides to examine tissue, initial procedure69$7,829$99
Surgical pathology, gross and microscopic examinations, for prostate needle biopsy, any method44$6,940$158
Special stained specimen slides to examine tissue, each additional procedure64$5,482$25
Special stained specimen slides to examine tissue, initial procedure100$4,581$31
Pathology examination of tissue using a microscope, high complexity27$4,172$130
Microscopic genetic analysis of tumor, manual22$2,747$37
Evaluation of fine needle aspirate with interpretation and report23$2,701$63
Pathology examination of tissue using a microscope, moderately low complexity52$2,512$42
Special stained specimen slides to identify organisms including interpretation and report15$2,102$111
Surgical pathology consultation and report on referred slides prepared elsewhere25$1,796$69
Screening cytopathology, cervical or vaginal (any reporting system), collected in preservative fluid, automated thin layer preparation, with screening by automated system and manual rescreening under physician supervision44$1,142$26
Pathology examination of specimen during surgery, first tissue block15$1,118$56
Cell examination of specimen, selective cellular enhancement technique37$967$25
Cell examination of specimen, concentration technique41$927$20
Pathology examination of tissue using a microscope, moderately low complexity72$853$10
Detection test by nucleic acid for human papillomavirus (hpv), high-risk types24$825$34
Special stained specimen slides to examine tissue, each multiplex procedure11$571$34
Pap test, automated thin layer preparation; automated system and manual rescreening11$287$26
Preparation of tissue for examination by removing any calcium present11$183$11
Pathology examination of tissue using a microscope15$110$6

Who their Medicare patients are

1,251 Original Medicare patients in 2024. Average age 74 · Under 65 3% · 85 and older 10% · Women 56% · Also on Medicaid 14% · Health risk score 1.13. At or below the middle of the specialty; the typical pathology clinician is at 1.55.

Conditions among them: High blood pressure 74% · Diabetes 29% · Cancer 29% · Coronary heart disease 27% · Chronic kidney disease 21% · Atrial fibrillation 18% · Heart failure 15% · Depression 14% · COPD 11% · Stroke 9% · Dementia 7%.

The office billed $793,301, Medicare allowed $260,529 and paid $202,727; for 3,402 services of 46 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
20241,2513,402741.13$793,301$202,727
20231,2623,226741.13$592,180$204,560
20224621,355731.44$442,514$68,601
20214231,425721.52$359,817$64,393
20203101,208721.87$290,592$51,188
20194361,983721.46$432,926$86,653
20186352,421731.46$545,733$112,789
20176713,049731.42$659,127$140,085
20163961,454721.52$328,695$69,406
2015116382711.21$93,323$18,638

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: 22 services

Original Medicare services billed in 2023
Pathology examination of tissue using a microscope, intermediate complexity729$117,683$71
Pathology examination of tissue using a microscope, intermediate complexity245$11,789$34
Microscopic genetic analysis of tumor, manual24$10,489$114
Special stained specimen slides to examine tissue, each additional procedure32$9,400$82
Pathology examination of tissue using a microscope, moderately high complexity20$8,040$287
Pathology examination of tissue using a microscope, moderately high complexity56$6,779$76
Special stained specimen slides to examine tissue, initial procedure61$6,609$97
Pathology examination of tissue using a microscope, high complexity21$3,131$136
Special stained specimen slides to examine tissue, initial procedure79$3,073$32
Special stained specimen slides to examine tissue, each additional procedure38$2,799$26
Microscopic genetic analysis of tumor, manual24$2,528$39
Special stained specimen slides to identify organisms including interpretation and report14$2,366$118
Pathology examination of tissue using a microscope, moderately low complexity45$2,132$44
Cell examination of specimen, concentration technique82$1,945$20
Evaluation of fine needle aspirate with interpretation and report18$1,506$65
Surgical pathology consultation and report on referred slides prepared elsewhere16$1,247$78
Screening cytopathology, cervical or vaginal (any reporting system), collected in preservative fluid, automated thin layer preparation, with screening by automated system and manual rescreening under physician supervision45$1,168$26
Special stained specimen slides to examine tissue including interpretation and report11$1,160$89
Pathology examination of specimen during surgery, first tissue block12$875$58
Pathology examination of tissue using a microscope, moderately low complexity71$841$11
Detection test by nucleic acid for human papillomavirus (hpv), high-risk types24$825$34
Preparation of tissue for examination by removing any calcium present39$449$12

2022: 14 services

Original Medicare services billed in 2022
Pathology examination of tissue using a microscope, moderately high complexity100$13,620$78
Pathology examination of tissue using a microscope, intermediate complexity134$13,359$34
Pathology examination of tissue using a microscope, intermediate complexity56$8,234$70
Surgical pathology consultation and report on referred slides prepared elsewhere95$7,500$76
Pathology examination of tissue using a microscope, high complexity29$4,930$137
Special stained specimen slides to examine tissue, each additional procedure47$4,511$26
Surgical pathology, gross and microscopic examinations, for prostate needle biopsy, any method23$3,811$166
Special stained specimen slides to examine tissue, initial procedure64$2,307$32
Pathology examination of specimen during surgery, first tissue block16$2,058$59
Surgical pathology consultation and report on referred material requiring preparation of slides13$1,057$81
Preparation of tissue for examination by removing any calcium present34$488$12
Pathology examination of tissue using a microscope, moderately low complexity36$436$11
Cell examination of specimen, concentration technique18$398$21
Pathology examination of tissue using a microscope, limited examination20$86$4

2021: 13 services

Original Medicare services billed in 2021
Pathology examination of tissue using a microscope, intermediate complexity116$21,189$36
Pathology examination of tissue using a microscope, moderately high complexity102$12,424$79
Surgical pathology consultation and report on referred slides prepared elsewhere145$11,714$79
Special stained specimen slides to examine tissue, each additional procedure46$5,627$27
Pathology examination of tissue using a microscope, high complexity32$4,767$140
Special stained specimen slides to examine tissue, initial procedure53$1,773$33
Pathology examination of specimen during surgery, first tissue block14$1,193$60
Surgical pathology consultation and report on referred material requiring preparation of slides14$1,073$77
Microscopic genetic analysis of tissue, manual, each additional multiplex stain procedure11$723$60
Preparation of tissue for examination by removing any calcium present37$579$11
Pathology examination of tissue using a microscope, moderately low complexity42$552$10
Pathology examination of tissue using a microscope11$84$6
Pathology examination of tissue using a microscope, limited examination15$62$4

2020: 14 services

Original Medicare services billed in 2020
Pathology examination of tissue using a microscope, moderately high complexity98$12,207$81
Pathology examination of tissue using a microscope, intermediate complexity94$10,732$37
Special stained specimen slides to examine tissue, each additional procedure64$8,632$28
Pathology examination of tissue using a microscope, high complexity25$3,745$144
Surgical pathology consultation and report on referred slides prepared elsewhere46$3,530$77
Special stained specimen slides to examine tissue, initial procedure80$3,143$35
Surgical pathology consultation and report on referred material requiring preparation of slides26$2,127$82
Pathology examination of specimen during surgery, first tissue block15$1,594$61
Microscopic genetic analysis of tissue, manual, each additional multiplex stain procedure17$1,183$62
Microscopic genetic analysis of tumor, manual15$784$41
Special stained specimen slides to identify organisms including interpretation and report14$727$26
Preparation of tissue for examination by removing any calcium present43$645$12
Pathology examination of tissue using a microscope, moderately low complexity39$498$11
Special stained specimen slides to examine tissue including interpretation and report12$262$12

2019: 14 services

Original Medicare services billed in 2019
Pathology examination of tissue using a microscope, intermediate complexity165$36,993$36
Pathology examination of tissue using a microscope, moderately high complexity123$18,453$79
Surgical pathology consultation and report on referred slides prepared elsewhere103$7,771$75
Pathology examination of tissue using a microscope, high complexity50$7,428$140
Special stained specimen slides to examine tissue, each additional procedure38$4,470$28
Pathology examination of specimen during surgery, first tissue block21$2,544$61
Special stained specimen slides to examine tissue, initial procedure58$2,346$34
Surgical pathology consultation and report on referred material requiring preparation of slides16$1,331$83
Microscopic genetic analysis of tissue, manual, each additional multiplex stain procedure15$972$61
Special stained specimen slides to examine tissue, each multiplex procedure16$813$37
Special stained specimen slides to identify organisms including interpretation and report12$737$25
Preparation of tissue for examination by removing any calcium present45$722$12
Pathology examination of tissue using a microscope, moderately low complexity44$563$11
Pathology examination of tissue using a microscope, limited examination23$100$4

2018: 16 services

Original Medicare services billed in 2018
Pathology examination of tissue using a microscope, intermediate complexity257$40,490$35
Pathology examination of tissue using a microscope, moderately high complexity156$27,062$79
Surgical pathology consultation and report on referred slides prepared elsewhere196$15,220$76
Pathology examination of tissue using a microscope, high complexity59$8,671$142
Special stained specimen slides to examine tissue, each additional procedure56$6,004$27
Pathology examination of specimen during surgery, first tissue block31$3,890$61
Special stained specimen slides to examine tissue, initial procedure91$3,445$34
Surgical pathology consultation and report on referred material requiring preparation of slides34$2,756$81
Microscopic genetic analysis of tissue, manual, each additional multiplex stain procedure17$1,256$60
Special stained specimen slides to examine tissue, each multiplex procedure22$1,188$37
Special stained specimen slides to identify organisms including interpretation and report19$889$25
Pathology examination of tissue using a microscope, moderately low complexity42$530$11
Preparation of tissue for examination by removing any calcium present36$529$12
Special stained specimen slides to examine tissue including interpretation and report11$146$11
Pathology examination of tissue using a microscope, limited examination31$127$4
Pathology examination of tissue using a microscope11$81$7

2017: 14 services

Original Medicare services billed in 2017
Pathology examination of tissue using a microscope, intermediate complexity306$61,491$36
Pathology examination of tissue using a microscope, moderately high complexity156$28,119$80
Surgical pathology consultation and report on referred slides prepared elsewhere216$16,846$77
Pathology examination of specimen during surgery, first tissue block60$10,245$60
Pathology examination of tissue using a microscope, high complexity63$9,078$142
Special stained specimen slides to examine tissue, each additional procedure52$4,853$27
Special stained specimen slides to examine tissue, initial procedure78$2,838$34
Surgical pathology consultation and report on referred material requiring preparation of slides28$2,285$82
Special stained specimen slides to examine tissue, each multiplex procedure20$735$37
Pathology examination of tissue using a microscope, moderately low complexity53$694$11
Special stained specimen slides to identify organisms including interpretation and report13$618$26
Preparation of tissue for examination by removing any calcium present37$552$12
Special stained specimen slides to examine tissue including interpretation and report14$203$11
Pathology examination of tissue using a microscope, limited examination17$78$4

2016: 11 services

Original Medicare services billed in 2016
Pathology examination of tissue using a microscope, intermediate complexity175$25,722$35
Pathology examination of tissue using a microscope, moderately high complexity78$12,028$79
Surgical pathology consultation and report on referred slides prepared elsewhere145$10,406$71
Pathology examination of specimen during surgery, first tissue block46$8,545$60
Pathology examination of tissue using a microscope, high complexity35$5,223$141
Special stained specimen slides to examine tissue, initial procedure45$1,753$33
Special stained specimen slides to examine tissue, each additional procedure22$1,735$25
Special stained specimen slides to identify organisms including interpretation and report12$411$26
Preparation of tissue for examination by removing any calcium present22$324$12
Pathology examination of tissue using a microscope, moderately low complexity15$191$11
Pathology examination of tissue using a microscope, limited examination13$57$4

2015: 7 services

Original Medicare services billed in 2015
Surgical pathology consultation and report on referred slides prepared elsewhere46$3,593$78
Pathology examination of tissue using a microscope, moderately high complexity25$2,921$79
Pathology examination of tissue using a microscope, intermediate complexity45$2,636$36
Pathology examination of tissue using a microscope, high complexity11$1,809$139
Special stained specimen slides to examine tissue, each additional procedure19$1,665$20
Flow cytometry technique for dna or cell analysis, 16 or more markers11$1,115$101
Special stained specimen slides to examine tissue, initial procedure23$967$33

Medicaid work

$7,839 in 2024

Medicaid paid $7,839 for 615 billed services this clinician did in 2024, up to 30 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
TISSUE EXAM BY PATHOLOGIST213$5,801
Blood count; complete (CBC), automated (Hgb, Hct, RBC, WBC and platelet count)259$1,160
Basic metabolic panel (Calcium, total) This panel must include the following: Calcium, total (82310) Carbon dioxide (bicarbonate) (82374) Chloride (82435) Creatinine (82565) Glucose (82947) Potassium (84132) Sodium (84295) Urea nitrogen (BUN) (84520)78$372
Immunohistochemistry or immunocytochemistry, per specimen; initial single antibody stain procedure17$206
TISSUE EXAM BY PATHOLOGIST34$172
COMPREHENSIVE METABOLIC PANEL14$128
Medicaid work by year
2024615630$7,839
20231,9221556$9,601
202246213$112
See the largest Medicaid services in earlier years

2023

Largest Medicaid services in 2023
TISSUE EXAM BY PATHOLOGIST234$8,323
Infectious agent detection by nucleic acid (DNA or RNA); severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) (coronavirus disease [COVID-19]), amplified probe technique76$430
Blood count; complete (CBC), automated (Hgb, Hct, RBC, WBC and platelet count)553$224
Immunohistochemistry or immunocytochemistry, per specimen; initial single antibody stain procedure13$213
TISSUE EXAM BY PATHOLOGIST26$120
COMPREHENSIVE METABOLIC PANEL319$118
Basic metabolic panel (Calcium, total) This panel must include the following: Calcium, total (82310) Carbon dioxide (bicarbonate) (82374) Chloride (82435) Creatinine (82565) Glucose (82947) Potassium (84132) Sodium (84295) Urea nitrogen (BUN) (84520)214$59
Measurement of magnesium116$26
ASSAY OF LIPASE90$25
Measurement of direct bilirubin123$19
Troponin, quantitative43$15
Lactate (lactic acid)12$13

2022

Largest Medicaid services in 2022
DECALCIFICATION PROCEDURE13$91
Blood count; complete (CBC), automated (Hgb, Hct, RBC, WBC and platelet count)33$20

Money from drug and device companies

$21 in 2023

A payment is not proof that care is biased.

Payments by company
Hologic Sales and ServicePanther Fusion$21
1 payment
  • Meals for Panther Fusion · 2023-03-17 · $21
See the published payment
Every published payment
Hologic Sales and ServiceMeals · 2023-03-17Panther Fusion$21

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
1083931489
Licence
CA A117953California A117953: Current · expires 2027-07-31
Trained
Duke University School of Medicine, 2010
Group
Stanford Health Care · Calpath Medical Associates
Gender
Male
More record details
Sole proprietor
No
Taxonomy
Federal specialty code 207ZP0102X (207ZP0102X); Federal specialty code 207SM0001X (207SM0001X); Federal specialty code 207ZH0000X (207ZH0000X); Federal specialty code 207ZP0101X (207ZP0101X)
Mailing address
300 Pasteur Dr, Stanford, CA, 94305
NPI first listed
2010-04-23
NPI last updated
2024-03-14
NPI record certified
2024-03-14

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