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Zheng Ma, MD

Pathology · San Jose

NPI 1184868713

Medicare standing
Clear
Enrolled, allowed to bill and order, not excluded
Plans that list them
Not verified
Not the same as out of network.
Office
1

Offices

1 location · County of Santa Clara · 1,000 clinicians in this group

Looking this up.

Hospitals listed: Santa Clara Valley Medical Center. 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. Ma’s office at (408) 885-5000 to ask if they take your plan before you enroll.

California Medical Board record

Licence A121772 · Current

Licensed to practise in California · since 2012 · expires 2028-06-30 · The Fourth Military Medical University.

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.

  • Santa Clara Valley Medical CenterSan Jose, CAAcute Care Hospital · Government - Local · Has an emergency department · Birthing-friendlyPart of Santa Clara Valley Health and Hospital System, which runs 3 hospitalsPatients rate it 3 of 5 · 70% would definitely recommend it
    Overall rating: 2 of 5 starsWorse than the national rate — SSI - Colon Surgery: 2.572, Oct 2024 – Sep 2025Better than the national rate — Central Line Associated Bloodstream Infection (ICU + select Wards): 0.563, Oct 2024 – Sep 2025Better than the national rate — Clostridium Difficile (C.Diff): 0.256, Oct 2024 – Sep 2025Better than the national rate — MRSA Bacteremia: 0.369, Oct 2024 – Sep 2025
See every measure and the patient survey for Santa Clara Valley Medical Center

Behind the star rating — Deaths: 2 better, 6 the same, 0 worse of 8 measures. Safety: 2 better, 5 the same, 1 worse of 8 measures. Readmissions: 0 better, 10 the same, 1 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 Santa Clara Valley Medical Center
SSI - Colon SurgeryInfections2.572WorseOct 2024 – Sep 2025
Central Line Associated Bloodstream Infection (ICU + select Wards)Infections0.563BetterOct 2024 – Sep 2025
Clostridium Difficile (C.Diff)Infections0.256BetterOct 2024 – Sep 2025
MRSA BacteremiaInfections0.369BetterOct 2024 – Sep 2025
Abdominopelvic accidental puncture or laceration rateComplications and deaths1.25 (0.3 to 2.2) · 1,535 casesNo differentJul 2022 – Jun 2024
CMS Medicare PSI 90: Patient safety and adverse events compositeComplications and deaths1.07 (0.76 to 1.38)No differentJul 2022 – Jun 2024
Death rate among surgical inpatients with serious treatable complicationsComplications and deaths214.59 (167.38 to 261.8) · 108 casesNo differentJul 2022 – Jun 2024
Death rate for CABG surgery patientsComplications and deaths2.8 · 41 casesNoneJul 2022 – Jun 2025
Death rate for COPD patientsComplications and deaths6 · 141 casesNoneJul 2022 – Jun 2025
Death rate for heart attack patientsComplications and deaths10.2 · 124 casesNoneJul 2022 – Jun 2025
Death rate for heart failure patientsComplications and deaths8.3 · 501 casesNoneJul 2022 – Jun 2025
Death rate for pneumonia patientsComplications and deaths14.9 · 653 casesNoneJul 2022 – Jun 2025
Death rate for stroke patientsComplications and deaths10.1 · 348 casesNoneJul 2023 – Jun 2025
Hybrid Hospital-Wide All-Cause Risk Standardized Mortality RateComplications and deaths3 · 4,502 casesNoneJul 2024 – Jun 2025
Iatrogenic pneumothorax rateComplications and deaths0.24 (0.04 to 0.43) · 9,014 casesNo differentJul 2022 – Jun 2024
In-hospital fall-associated fracture rateComplications and deaths0.34 (0.15 to 0.52) · 9,216 casesNo differentJul 2022 – Jun 2024
Perioperative pulmonary embolism or deep vein thrombosis rateComplications and deaths4.54 (2.51 to 6.58) · 1,421 casesNo differentJul 2022 – Jun 2024
Postoperative acute kidney injury requiring dialysis rateComplications and deaths1.54 (0 to 3.2) · 288 casesNo differentJul 2022 – Jun 2024
Postoperative hemorrhage or hematoma rateComplications and deaths2.11 (0.66 to 3.56) · 1,446 casesNo differentJul 2022 – Jun 2024
Postoperative respiratory failure rateComplications and deaths11.61 (4.09 to 19.14) · 294 casesNo differentJul 2022 – Jun 2024
Postoperative sepsis rateComplications and deaths7.29 (3.39 to 11.2) · 299 casesNo differentJul 2022 – Jun 2024
Postoperative wound dehiscence rateComplications and deaths1.9 (0.45 to 3.36) · 333 casesNo differentJul 2022 – Jun 2024
Pressure ulcer rateComplications and deaths0.23 (0 to 0.78) · 7,538 casesNo differentJul 2022 – Jun 2024
Rate of complications for hip/knee replacement patientsComplications and deaths5.4 · 94 casesNoneApr 2023 – Mar 2025
Catheter Associated Urinary Tract Infections (ICU + select Wards)Infections0.735No differentOct 2024 – Sep 2025
SSI - Abdominal HysterectomyInfections2.573No differentOct 2024 – Sep 2025
Acute Myocardial Infarction (AMI) 30-Day Readmission RateUnplanned return visits14.6 · 185 casesNoneJul 2023 – Jun 2025
Heart failure (HF) 30-Day Readmission RateUnplanned return visits22.1 · 951 casesNoneJul 2023 – Jun 2025
Hospital return days for heart attack patientsUnplanned return visits56.3 · 128 casesNoneJul 2022 – Jun 2025
Hospital return days for heart failure patientsUnplanned return visits6.4 · 644 casesNoneJul 2022 – Jun 2025
Hospital return days for pneumonia patientsUnplanned return visits1.3 · 699 casesNoneJul 2022 – Jun 2025
Pneumonia (PN) 30-Day Readmission RateUnplanned return visits16.3 · 921 casesNoneJul 2023 – Jun 2025
Rate of emergency department (ED) visits for patients receiving outpatient chemotherapyUnplanned return visits5.7 (3.9 to 8.1) · 226 casesNo differentJan 2024 – Dec 2024
Rate of inpatient admissions for patients receiving outpatient chemotherapyUnplanned return visits12.6 (9.4 to 16.5) · 226 casesNo differentJan 2024 – Dec 2024
Rate of readmission after hip/knee replacementUnplanned return visits5.4 · 94 casesNoneJul 2023 – Jun 2025
Rate of readmission for CABGUnplanned return visits11.4 · 54 casesNoneJul 2023 – Jun 2025
Rate of readmission for chronic obstructive pulmonary disease (COPD) patientsUnplanned return visits20.3 · 242 casesNoneJul 2023 – Jun 2025
Rate of unplanned hospital visits after colonoscopy (per 1,000 colonoscopies)Unplanned return visits13.2 (9.9 to 17.4) · 702 casesNo differentJan 2022 – Dec 2024
Ratio of unplanned hospital visits after hospital outpatient surgeryUnplanned return visits1 (0.7 to 1.4) · 195 casesNo differentJan 2024 – Dec 2024

What patients said (4,032 patients answered, 29% of those asked)

Patient survey stars by topic at Santa Clara Valley Medical Center
Cleanliness3
Nurse communication3
Doctor communication3
Communication about medicines3
Discharge information2
Overall hospital rating3
Quietness2
Recommend hospital4
Share of patients giving the best answer at Santa Clara Valley Medical Center
Room was "always" clean70%
Nurses "always" communicated well73%
Doctors "always" communicated well76%
Staff "always" explained57%
Yes, staff "did" give patients this information82%
Yes, staff "did" give patients information about help after discharge82%
Doctors "always" explained things so they could understand71%
Doctors "always" listened carefully74%
Doctors "always" treated them with courtesy and respect82%
Patients who gave a rating of "9" or "10" (high)67%
Staff "always" explained new medications71%
Nurses "always" explained things so they could understand71%
Nurses "always" listened carefully69%
Nurses "always" treated them with courtesy and respect80%
"Always" quiet at night43%
"YES", patients would definitely recommend the hospital70%
Staff "always" explained possible side effects44%
Yes, staff "did" give patients information about possible symptoms83%

Original Medicare doctor bills

$25,894

Medicare paid this office $25,894 for 193 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 complexity113$6,983$32
Special stained specimen slides to examine tissue, each additional procedure39$4,289$25
Pathology examination of tissue using a microscope, moderately high complexity28$3,133$75
Special stained specimen slides to examine tissue, initial procedure51$2,187$32
Evaluation of fine needle aspirate with interpretation and report19$1,652$64
See all 9 services
Every Original Medicare service billed
Pathology examination of tissue using a microscope, intermediate complexity113$6,983$32
Special stained specimen slides to examine tissue, each additional procedure39$4,289$25
Pathology examination of tissue using a microscope, moderately high complexity28$3,133$75
Special stained specimen slides to examine tissue, initial procedure51$2,187$32
Evaluation of fine needle aspirate with interpretation and report19$1,652$64
Special stained specimen slides to identify organisms including interpretation and report25$913$23
Evaluation of fine needle aspirate13$837$32
Cell examination of specimen, selective cellular enhancement technique32$798$22
Pathology examination of tissue using a microscope, moderately low complexity14$163$10

Who their Medicare patients are

193 Original Medicare patients in 2024. Average age 71 · Under 65 15% · 85 and older 7% · Women 49% · Also on Medicaid 78% · Health risk score 1.90. Above the middle of the specialty; the typical pathology clinician is at 1.55.

Conditions among them: High blood pressure 75% · Diabetes 54% · Coronary heart disease 30% · Cancer 28% · Chronic kidney disease 26% · Heart failure 22% · Depression 22% · COPD 19% · Atrial fibrillation 15% · Dementia 11% · Stroke 10%.

The office billed $359,873, Medicare allowed $33,024 and paid $25,894; for 808 services of 32 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
2024193808711.90$359,873$25,894
2023214662712.04$276,760$20,992
2022230703712.03$300,039$23,092
2021195533702.08$198,411$16,771
2020251621752.48$212,622$18,641
20194451,183732.12$375,803$39,181
20185061,681752.31$391,855$54,137
20174981,803752.07$427,570$59,946
20165491,669731.92$385,502$56,647
2015284695691.50$141,263$25,696
20142677691.06$10,722$2,655

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
Pathology examination of tissue using a microscope, intermediate complexity138$8,259$33
Special stained specimen slides to examine tissue, each additional procedure27$2,482$26
Pathology examination of tissue using a microscope, moderately high complexity20$2,003$77
Special stained specimen slides to examine tissue, initial procedure37$1,593$33
Evaluation of fine needle aspirate with interpretation and report14$1,179$65
Special stained specimen slides to identify organisms including interpretation and report30$1,159$25
Microscopic genetic analysis of tumor, manual11$1,050$39
Cell examination of specimen, selective cellular enhancement technique27$744$23
Cell examination of specimen, concentration technique12$209$17

2022: 9 services

Original Medicare services billed in 2022
Pathology examination of tissue using a microscope, intermediate complexity140$9,330$33
Evaluation of fine needle aspirate with interpretation and report32$2,249$66
Special stained specimen slides to examine tissue, each additional procedure21$1,825$26
Special stained specimen slides to examine tissue, initial procedure42$1,792$32
Pathology examination of tissue using a microscope, moderately high complexity14$1,242$78
Special stained specimen slides to identify organisms including interpretation and report31$1,059$22
Cell examination of specimen, selective cellular enhancement technique26$663$25
Evaluation of fine needle aspirate14$604$34
Cell examination of specimen, concentration technique14$298$20

2021: 9 services

Original Medicare services billed in 2021
Pathology examination of tissue using a microscope, intermediate complexity111$7,729$36
Special stained specimen slides to identify organisms including interpretation and report32$1,523$25
Special stained specimen slides to examine tissue, each additional procedure17$1,440$27
Special stained specimen slides to examine tissue, initial procedure33$1,438$33
Pathology examination of tissue using a microscope, moderately high complexity12$951$79
Cell examination of specimen, selective cellular enhancement technique33$950$26
Blood smear interpretation by physician with written report20$436$22
Cell examination of specimen, concentration technique15$323$22
Preparation of tissue for examination by removing any calcium present11$118$11

2020: 12 services

Original Medicare services billed in 2020
Pathology examination of tissue using a microscope, intermediate complexity126$8,025$34
Pathology examination of tissue using a microscope, moderately high complexity28$2,807$80
Special stained specimen slides to examine tissue, initial procedure33$1,160$33
Special stained specimen slides to examine tissue, each additional procedure18$985$27
Special stained specimen slides to identify organisms including interpretation and report17$789$25
Cell examination of specimen, concentration technique26$756$22
Cell examination of specimen, selective cellular enhancement technique21$691$27
Pathology examination of tissue using a microscope, moderately low complexity37$500$11
Special stained specimen slides to examine tissue including interpretation and report25$405$12
Blood smear interpretation by physician with written report12$345$23
Preparation of tissue for examination by removing any calcium present23$321$12
Pathology examination of tissue using a microscope, limited examination21$87$4

2019: 12 services

Original Medicare services billed in 2019
Pathology examination of tissue using a microscope, intermediate complexity270$16,187$36
Pathology examination of tissue using a microscope, moderately high complexity57$6,054$80
Special stained specimen slides to examine tissue, each additional procedure44$4,282$27
Special stained specimen slides to examine tissue, initial procedure74$3,092$33
Special stained specimen slides to identify organisms including interpretation and report28$1,321$25
Cell examination of specimen, concentration technique51$1,286$21
Cell examination of specimen, selective cellular enhancement technique22$617$27
Pathology examination of tissue using a microscope, moderately low complexity45$518$11
Blood smear interpretation by physician with written report21$502$23
Preparation of tissue for examination by removing any calcium present33$424$12
Special stained specimen slides to examine tissue including interpretation and report18$332$11
Pathology examination of tissue using a microscope, limited examination38$165$4

2018: 12 services

Original Medicare services billed in 2018
Pathology examination of tissue using a microscope, intermediate complexity345$19,557$35
Special stained specimen slides to examine tissue, each additional procedure74$9,732$26
Pathology examination of tissue using a microscope, moderately high complexity73$7,606$77
Special stained specimen slides to examine tissue, initial procedure183$7,220$32
Pathology examination of specimen during surgery, first tissue block20$1,828$59
Cell examination of specimen, concentration technique61$1,381$21
Special stained specimen slides to identify organisms including interpretation and report26$1,232$25
Pathology examination of tissue using a microscope, moderately low complexity48$594$10
Blood smear interpretation by physician with written report23$584$22
Special stained specimen slides to examine tissue including interpretation and report34$507$11
Preparation of tissue for examination by removing any calcium present28$373$12
Pathology examination of tissue using a microscope, limited examination39$159$4

2017: 14 services

Original Medicare services billed in 2017
Pathology examination of tissue using a microscope, intermediate complexity374$23,965$35
Special stained specimen slides to examine tissue, each additional procedure81$8,874$27
Special stained specimen slides to examine tissue, initial procedure184$7,647$33
Pathology examination of tissue using a microscope, moderately high complexity51$6,132$79
Pathology examination of tissue using a microscope, high complexity17$2,229$131
Special stained specimen slides to identify organisms including interpretation and report31$2,144$25
Pathology examination of specimen during surgery, first tissue block17$2,008$59
Cell examination of specimen, concentration technique62$1,435$21
Evaluation of fine needle aspirate with interpretation and report14$926$66
Special stained specimen slides to examine tissue including interpretation and report57$827$11
Pathology examination of tissue using a microscope, moderately low complexity57$648$10
Preparation of tissue for examination by removing any calcium present27$341$12
Blood smear interpretation by physician with written report11$272$23
Pathology examination of tissue using a microscope16$106$6

2016: 16 services

Original Medicare services billed in 2016
Pathology examination of tissue using a microscope, intermediate complexity253$16,032$36
Special stained specimen slides to examine tissue, each additional procedure65$7,804$25
Pathology examination of tissue using a microscope, moderately high complexity40$5,257$80
Cell examination of specimen, selective cellular enhancement technique182$4,928$24
Special stained specimen slides to examine tissue, initial procedure117$4,659$34
Evaluation of fine needle aspirate with interpretation and report65$4,599$63
Pathology examination of specimen during surgery, first tissue block24$2,570$60
Evaluation of fine needle aspirate52$1,923$33
Cell examination of specimen, concentration technique50$1,293$21
Special stained specimen slides to identify organisms including interpretation and report37$1,258$25
Microscopic genetic analysis of tumor, manual14$922$51
Pap test21$570$27
Special stained specimen slides to examine tissue including interpretation and report26$483$11
Pathology examination of tissue using a microscope, moderately low complexity30$340$11
Pap test, evaluation of fine needle aspirate, immediate, each additional evaluation episode11$300$21
Preparation of tissue for examination by removing any calcium present11$132$12

2015: 10 services

Original Medicare services billed in 2015
Pathology examination of specimen during surgery, first tissue block27$4,950$53
Pathology examination of tissue using a microscope, intermediate complexity79$4,241$32
Cell examination of specimen, selective cellular enhancement technique123$3,386$26
Pathology examination of tissue using a microscope, moderately high complexity20$2,805$70
Evaluation of fine needle aspirate with interpretation and report24$1,865$67
Special stained specimen slides to examine tissue, each additional procedure26$1,436$19
Special stained specimen slides to examine tissue, initial procedure32$1,031$30
Evaluation of fine needle aspirate22$894$34
Special stained specimen slides to identify organisms including interpretation and report21$573$25
Pap test14$440$31

2014: 1 service

Original Medicare services billed in 2014
Pathology examination of tissue using a microscope, intermediate complexity19$1,249$31

Medicaid work

$14,244 in 2024

Medicaid paid $14,244 for 1,518 billed services this clinician did in 2024, up to 67 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 PATHOLOGIST972$10,166
TISSUE EXAM BY PATHOLOGIST78$1,131
Special stain including interpretation and report; Group I for microorganisms (eg, acid fast, methenamine silver)103$900
Immunohistochemistry or immunocytochemistry, per specimen; initial single antibody stain procedure116$820
TISSUE EXAM BY PATHOLOGIST92$667
CYTP EVAL FINE NEEDLE ASPIRATE INTERP & REPORT34$162
IMHCHEM/IMCYTCHM EA ADD ANTB78$156
Cytopathology, cervical or vaginal (any reporting system), collected in preservative fluid, automated thin layer preparation; with screening by automated system and manual rescreening or review, under physician supervision17$132
Cytopathology, selective cellular enhancement technique with interpretation (eg, liquid based slide preparation method), except cervical or vaginal28$110
Medicaid work by year
20241,518967$14,244
20231,900992$15,386
20221,8631185$14,926
20211,344868$11,555
2020553655$6,919
2019247428$3,305
2018248425$5,038
See the largest Medicaid services in earlier years

2023

Largest Medicaid services in 2023
TISSUE EXAM BY PATHOLOGIST1,290$11,154
Immunohistochemistry or immunocytochemistry, per specimen; initial single antibody stain procedure183$1,626
TISSUE EXAM BY PATHOLOGIST33$1,004
Special stain including interpretation and report; Group I for microorganisms (eg, acid fast, methenamine silver)184$806
TISSUE EXAM BY PATHOLOGIST59$482
Cytopathology, selective cellular enhancement technique with interpretation (eg, liquid based slide preparation method), except cervical or vaginal65$262
CYTP EVAL FINE NEEDLE ASPIRATE INTERP & REPORT29$52
Pap test14$0
IMHCHEM/IMCYTCHM EA ADD ANTB43$0

2022

Largest Medicaid services in 2022
TISSUE EXAM BY PATHOLOGIST1,153$9,570
Immunohistochemistry or immunocytochemistry, per specimen; initial single antibody stain procedure216$1,632
TISSUE EXAM BY PATHOLOGIST58$1,323
Special stain including interpretation and report; Group I for microorganisms (eg, acid fast, methenamine silver)138$908
CYTP EVAL FINE NEEDLE ASPIRATE INTERP & REPORT85$523
TISSUE EXAM BY PATHOLOGIST34$376
Cytopathology, concentration technique, smears and interpretation (eg, Saccomanno technique)17$216
IMHCHEM/IMCYTCHM EA ADD ANTB95$212
Cytopathology, selective cellular enhancement technique with interpretation (eg, liquid based slide preparation method), except cervical or vaginal35$82
Cytopathology, cervical or vaginal (any reporting system), collected in preservative fluid, automated thin layer preparation; with screening by automated system and manual rescreening or review, under physician supervision12$69
Cytopathology, evaluation of fine needle aspirate; immediate cytohistologic study to determine adequacy for diagnosis, first evaluation episode, each site20$14

2021

Largest Medicaid services in 2021
TISSUE EXAM BY PATHOLOGIST1,077$9,842
TISSUE EXAM BY PATHOLOGIST49$783
Special stain including interpretation and report; Group I for microorganisms (eg, acid fast, methenamine silver)97$478
Cytopathology, cervical or vaginal (any reporting system), collected in preservative fluid, automated thin layer preparation; with screening by automated system and manual rescreening or review, under physician supervision30$141
Immunohistochemistry or immunocytochemistry, per specimen; initial single antibody stain procedure52$112
TISSUE EXAM BY PATHOLOGIST13$76
Cytopathology, selective cellular enhancement technique with interpretation (eg, liquid based slide preparation method), except cervical or vaginal14$66
Cytopathology, concentration technique, smears and interpretation (eg, Saccomanno technique)12$57

2020

Largest Medicaid services in 2020
TISSUE EXAM BY PATHOLOGIST421$5,383
TISSUE EXAM BY PATHOLOGIST59$929
Immunohistochemistry or immunocytochemistry, per specimen; initial single antibody stain procedure12$232
Special stain including interpretation and report; Group I for microorganisms (eg, acid fast, methenamine silver)19$190
CYTP EVAL FINE NEEDLE ASPIRATE INTERP & REPORT27$185
Cytopathology, selective cellular enhancement technique with interpretation (eg, liquid based slide preparation method), except cervical or vaginal15$0

2019

Largest Medicaid services in 2019
TISSUE EXAM BY PATHOLOGIST201$2,715
Immunohistochemistry or immunocytochemistry, per specimen; initial single antibody stain procedure17$327
TISSUE EXAM BY PATHOLOGIST16$229
Cytopathology, concentration technique, smears and interpretation (eg, Saccomanno technique)13$33

2018

Largest Medicaid services in 2018
TISSUE EXAM BY PATHOLOGIST48$2,229
TISSUE EXAM BY PATHOLOGIST118$1,635
TISSUE EXAM BY PATHOLOGIST40$601
Immunohistochemistry or immunocytochemistry, per specimen; initial single antibody stain procedure42$573

Checkups this office reported

Medicare did not publish checkup rates for this clinician.

Medicare’s overall office score
80.6 / 100
Scores the office’s reporting and systems. It is not a grade for how the doctor treats you.

Professional record

NPI
1184868713
Licence
CA A121772California A121772: Current · expires 2028-06-30
Gender
Female
More record details
Sole proprietor
No
Taxonomy
Federal specialty code 207ZP0102X (207ZP0102X); Student in a training program (390200000X)
Mailing address
2105 Forest Ave, San Jose, CA, 95128
NPI first listed
2009-04-27
NPI last updated
2016-09-08

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