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Haiyan Zhang, MD

Pathology · San Diego

NPI 1457617110

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 · Regents of the University of California · 2,047 clinicians in this group

Looking this up.

Hospitals listed: UC San Diego Health Hillcrest - Hillcrest Med Ctr. 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. Zhang’s office at (858) 249-6753 to ask if they take your plan before you enroll.

California Medical Board record

Licence A133801 · Current

Licensed to practise in California · since 2014 · expires 2028-09-30 · Luzhou Medical College.

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.

  • UC San Diego Health Hillcrest - Hillcrest Med CtrSan Diego, CAAcute Care Hospital · Voluntary non-profit - Other · Has an emergency department · Birthing-friendlyPart of University of California Health, which runs 12 hospitalsHome of Moores Comprehensive Cancer Center, a National Cancer Institute designated comprehensive cancer centrePatients rate it 3 of 5 · 75% would definitely recommend it
    Overall rating: 5 of 5 starsBetter than the national rate — Death rate among surgical inpatients with serious treatable complications: 105.39 (74.34 to 136.44) · 381 cases, Jul 2022 – Jun 2024Better than the national rate — Catheter Associated Urinary Tract Infections (ICU + select Wards): 0.597, Oct 2024 – Sep 2025Better than the national rate — Central Line Associated Bloodstream Infection (ICU + select Wards): 0.618, Oct 2024 – Sep 2025Better than the national rate — Clostridium Difficile (C.Diff): 0.375, Oct 2024 – Sep 2025Better than the national rate — SSI - Colon Surgery: 0.376, Oct 2024 – Sep 2025
See every measure and the patient survey for UC San Diego Health Hillcrest - Hillcrest Med Ctr

Behind the star rating — Deaths: 6 better, 2 the same, 0 worse of 8 measures. Safety: 3 better, 5 the same, 0 worse of 8 measures. Readmissions: 1 better, 8 the same, 2 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 UC San Diego Health Hillcrest - Hillcrest Med Ctr
Death rate among surgical inpatients with serious treatable complicationsComplications and deaths105.39 (74.34 to 136.44) · 381 casesBetterJul 2022 – Jun 2024
Catheter Associated Urinary Tract Infections (ICU + select Wards)Infections0.597BetterOct 2024 – Sep 2025
Central Line Associated Bloodstream Infection (ICU + select Wards)Infections0.618BetterOct 2024 – Sep 2025
Clostridium Difficile (C.Diff)Infections0.375BetterOct 2024 – Sep 2025
SSI - Colon SurgeryInfections0.376BetterOct 2024 – Sep 2025
Abdominopelvic accidental puncture or laceration rateComplications and deaths0.83 (0.11 to 1.54) · 3,862 casesNo differentJul 2022 – Jun 2024
CMS Medicare PSI 90: Patient safety and adverse events compositeComplications and deaths1.02 (0.84 to 1.2)No differentJul 2022 – Jun 2024
Death rate for CABG surgery patientsComplications and deaths1.4 · 130 casesNoneJul 2022 – Jun 2025
Death rate for COPD patientsComplications and deaths6.2 · 116 casesNoneJul 2022 – Jun 2025
Death rate for heart attack patientsComplications and deaths9.1 · 183 casesNoneJul 2022 – Jun 2025
Death rate for heart failure patientsComplications and deaths7.8 · 510 casesNoneJul 2022 – Jun 2025
Death rate for pneumonia patientsComplications and deaths11 · 696 casesNoneJul 2022 – Jun 2025
Death rate for stroke patientsComplications and deaths9.4 · 435 casesNoneJul 2023 – Jun 2025
Hybrid Hospital-Wide All-Cause Risk Standardized Mortality RateComplications and deaths2.1 · 5,739 casesNoneJul 2024 – Jun 2025
Iatrogenic pneumothorax rateComplications and deaths0.15 (0 to 0.32) · 12,387 casesNo differentJul 2022 – Jun 2024
In-hospital fall-associated fracture rateComplications and deaths0.27 (0.1 to 0.44) · 13,596 casesNo differentJul 2022 – Jun 2024
Perioperative pulmonary embolism or deep vein thrombosis rateComplications and deaths4.59 (3.24 to 5.94) · 4,389 casesNo differentJul 2022 – Jun 2024
Postoperative acute kidney injury requiring dialysis rateComplications and deaths1.04 (0 to 2.12) · 2,419 casesNo differentJul 2022 – Jun 2024
Postoperative hemorrhage or hematoma rateComplications and deaths2.26 (1.23 to 3.29) · 4,116 casesNo differentJul 2022 – Jun 2024
Postoperative respiratory failure rateComplications and deaths9.93 (6.61 to 13.25) · 2,232 casesNo differentJul 2022 – Jun 2024
Postoperative sepsis rateComplications and deaths7.31 (5.24 to 9.38) · 2,410 casesNo differentJul 2022 – Jun 2024
Postoperative wound dehiscence rateComplications and deaths2.32 (1.07 to 3.56) · 1,286 casesNo differentJul 2022 – Jun 2024
Pressure ulcer rateComplications and deaths0.38 (0.02 to 0.75) · 11,838 casesNo differentJul 2022 – Jun 2024
Rate of complications for hip/knee replacement patientsComplications and deaths3.5 · 181 casesNoneApr 2023 – Mar 2025
MRSA BacteremiaInfections0.716No differentOct 2024 – Sep 2025
SSI - Abdominal HysterectomyInfections0.672No differentOct 2024 – Sep 2025
Acute Myocardial Infarction (AMI) 30-Day Readmission RateUnplanned return visits14.5 · 302 casesNoneJul 2023 – Jun 2025
Heart failure (HF) 30-Day Readmission RateUnplanned return visits19.3 · 891 casesNoneJul 2023 – Jun 2025
Hospital return days for heart attack patientsUnplanned return visits3.8 · 216 casesNoneJul 2022 – Jun 2025
Hospital return days for heart failure patientsUnplanned return visits5.9 · 620 casesNoneJul 2022 – Jun 2025
Hospital return days for pneumonia patientsUnplanned return visits12 · 731 casesNoneJul 2022 – Jun 2025
Pneumonia (PN) 30-Day Readmission RateUnplanned return visits15.7 · 946 casesNoneJul 2023 – Jun 2025
Rate of emergency department (ED) visits for patients receiving outpatient chemotherapyUnplanned return visits5.9 (4.8 to 7) · 1,507 casesNo differentJan 2024 – Dec 2024
Rate of inpatient admissions for patients receiving outpatient chemotherapyUnplanned return visits12.3 (10.7 to 14) · 1,507 casesNo differentJan 2024 – Dec 2024
Rate of readmission after hip/knee replacementUnplanned return visits7.1 · 191 casesNoneJul 2023 – Jun 2025
Rate of readmission for CABGUnplanned return visits9.7 · 177 casesNoneJul 2023 – Jun 2025
Rate of readmission for chronic obstructive pulmonary disease (COPD) patientsUnplanned return visits19.7 · 204 casesNoneJul 2023 – Jun 2025
Rate of unplanned hospital visits after colonoscopy (per 1,000 colonoscopies)Unplanned return visits10.4 (8.5 to 13) · 4,116 casesNo differentJan 2022 – Dec 2024
Ratio of unplanned hospital visits after hospital outpatient surgeryUnplanned return visits0.9 (0.7 to 1) · 2,130 casesNo differentJan 2024 – Dec 2024

What patients said (3,680 patients answered, 16% of those asked)

Patient survey stars by topic at UC San Diego Health Hillcrest - Hillcrest Med Ctr
Cleanliness3
Nurse communication3
Doctor communication3
Communication about medicines3
Discharge information4
Overall hospital rating4
Quietness2
Recommend hospital4
Share of patients giving the best answer at UC San Diego Health Hillcrest - Hillcrest Med Ctr
Room was "always" clean66%
Nurses "always" communicated well79%
Doctors "always" communicated well79%
Staff "always" explained61%
Yes, staff "did" give patients this information88%
Yes, staff "did" give patients information about help after discharge87%
Doctors "always" explained things so they could understand75%
Doctors "always" listened carefully78%
Doctors "always" treated them with courtesy and respect86%
Patients who gave a rating of "9" or "10" (high)73%
Staff "always" explained new medications73%
Nurses "always" explained things so they could understand75%
Nurses "always" listened carefully75%
Nurses "always" treated them with courtesy and respect86%
"Always" quiet at night49%
"YES", patients would definitely recommend the hospital75%
Staff "always" explained possible side effects48%
Yes, staff "did" give patients information about possible symptoms88%

Original Medicare doctor bills

$74,140

Medicare paid this office $74,140 for 619 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 complexity427$26,580$28
Pathology examination of tissue using a microscope, moderately high complexity87$8,786$66
Antibody evaluation, each additional single antibody stain procedure43$8,290$23
Surgical pathology, gross and microscopic examinations, for prostate needle biopsy, any method50$6,954$139
Pathology examination of tissue using a microscope, high complexity38$5,615$117
See all 17 services
Every Original Medicare service billed
Pathology examination of tissue using a microscope, intermediate complexity427$26,580$28
Pathology examination of tissue using a microscope, moderately high complexity87$8,786$66
Antibody evaluation, each additional single antibody stain procedure43$8,290$23
Surgical pathology, gross and microscopic examinations, for prostate needle biopsy, any method50$6,954$139
Pathology examination of tissue using a microscope, high complexity38$5,615$117
Special stained specimen slides to examine tissue, each additional procedure66$4,079$22
Special stained specimen slides to examine tissue, initial procedure111$3,655$28
Electron microscopy for diagnosis37$2,307$62
Special stained specimen slides to examine tissue including interpretation and report68$2,272$10
Antibody evaluation, initial single antibody stain procedure43$1,244$29
Pathology examination of specimen during surgery, first tissue block15$953$50
Surgical pathology consultation and report on referred slides prepared elsewhere12$806$67
Special stained specimen slides to examine tissue, each multiplex procedure18$743$31
Pathology examination of tissue using a microscope, moderately low complexity53$547$9
Special stained specimen slides to identify organisms including interpretation and report11$300$21
Preparation of tissue for examination by removing any calcium present18$223$10
Pathology examination of tissue using a microscope, limited examination15$60$4

Who their Medicare patients are

619 Original Medicare patients in 2024. Average age 71 · Under 65 13% · 85 and older 4% · Women 42% · Also on Medicaid 27% · Health risk score 1.91. Above the middle of the specialty; the typical pathology clinician is at 1.55.

Conditions among them: High blood pressure 73% · Cancer 37% · Diabetes 34% · Chronic kidney disease 32% · Coronary heart disease 30% · Depression 25% · Atrial fibrillation 21% · Heart failure 19% · COPD 15% · Stroke 8% · Dementia 5%.

The office billed $375,382, Medicare allowed $95,596 and paid $74,140; for 2,350 services of 21 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
20246192,350711.91$375,382$74,140
20237102,464721.87$377,043$81,590
20226302,188711.69$340,035$74,098
20216402,333711.91$352,401$75,651
20205341,993702.20$293,240$63,801
20195292,128692.18$317,904$67,740
201822191653.49$22,581$5,315

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: 16 services

Original Medicare services billed in 2023
Pathology examination of tissue using a microscope, intermediate complexity450$30,691$30
Pathology examination of tissue using a microscope, moderately high complexity103$10,944$68
Surgical pathology, gross and microscopic examinations, for prostate needle biopsy, any method58$8,184$141
Antibody evaluation, each additional single antibody stain procedure39$7,770$24
Pathology examination of tissue using a microscope, high complexity35$5,275$120
Special stained specimen slides to examine tissue, each additional procedure64$3,778$23
Special stained specimen slides to examine tissue, initial procedure110$3,726$28
Electron microscopy for diagnosis32$2,173$64
Pathology examination of specimen during surgery, first tissue block19$1,798$51
Special stained specimen slides to examine tissue including interpretation and report57$1,766$10
Antibody evaluation, initial single antibody stain procedure40$1,269$30
Preparation of tissue for examination by removing any calcium present79$854$10
Special stained specimen slides to examine tissue, each multiplex procedure20$853$32
Special stained specimen slides to identify organisms including interpretation and report20$684$21
Pathology examination of tissue using a microscope, moderately low complexity59$605$9
Pathology examination of tissue using a microscope, limited examination38$144$4

2022: 16 services

Original Medicare services billed in 2022
Pathology examination of tissue using a microscope, intermediate complexity395$25,854$30
Pathology examination of tissue using a microscope, moderately high complexity105$10,075$69
Surgical pathology, gross and microscopic examinations, for prostate needle biopsy, any method58$8,217$139
Antibody evaluation, each additional single antibody stain procedure40$8,132$24
Pathology examination of tissue using a microscope, high complexity28$3,674$122
Special stained specimen slides to examine tissue, initial procedure101$3,385$29
Special stained specimen slides to examine tissue, each additional procedure62$2,939$24
Electron microscopy for diagnosis37$2,484$65
Special stained specimen slides to examine tissue including interpretation and report61$1,876$10
Pathology examination of specimen during surgery, first tissue block20$1,525$53
Special stained specimen slides to examine tissue, each multiplex procedure29$1,413$32
Antibody evaluation, initial single antibody stain procedure40$1,275$30
Preparation of tissue for examination by removing any calcium present57$618$10
Pathology examination of tissue using a microscope, moderately low complexity54$546$10
Special stained specimen slides to identify organisms including interpretation and report15$376$21
Pathology examination of tissue using a microscope, limited examination18$67$4

2021: 18 services

Original Medicare services billed in 2021
Pathology examination of tissue using a microscope, intermediate complexity436$29,198$30
Pathology examination of tissue using a microscope, moderately high complexity97$10,464$70
Antibody evaluation, each additional single antibody stain procedure37$7,491$25
Surgical pathology, gross and microscopic examinations, for prostate needle biopsy, any method32$4,802$150
Pathology examination of tissue using a microscope, high complexity23$3,631$125
Special stained specimen slides to examine tissue, initial procedure90$3,178$29
Electron microscopy for diagnosis45$3,053$66
Special stained specimen slides to examine tissue, each additional procedure49$2,946$24
Special stained specimen slides to examine tissue including interpretation and report76$2,339$10
Pathology examination of specimen during surgery, first tissue block22$2,290$52
Antibody evaluation, initial single antibody stain procedure44$1,449$31
Surgical pathology consultation and report on referred slides prepared elsewhere12$856$71
Special stained specimen slides to examine tissue, each multiplex procedure13$784$33
Special stained specimen slides to identify organisms including interpretation and report31$776$22
Microscopic genetic analysis of tumor, manual12$611$36
Preparation of tissue for examination by removing any calcium present53$595$11
Pathology examination of tissue using a microscope, moderately low complexity56$555$9
Pathology examination of tissue using a microscope, limited examination26$102$4

2020: 15 services

Original Medicare services billed in 2020
Pathology examination of tissue using a microscope, intermediate complexity335$24,104$32
Pathology examination of tissue using a microscope, moderately high complexity78$8,511$72
Antibody evaluation, each additional single antibody stain procedure32$6,223$25
Pathology examination of tissue using a microscope, high complexity29$5,124$128
Special stained specimen slides to examine tissue, each additional procedure42$3,121$25
Special stained specimen slides to examine tissue, initial procedure78$2,736$30
Pathology examination of specimen during surgery, first tissue block25$2,411$55
Electron microscopy for diagnosis32$2,215$67
Special stained specimen slides to examine tissue including interpretation and report54$1,787$11
Surgical pathology consultation and report on referred slides prepared elsewhere18$1,311$69
Antibody evaluation, initial single antibody stain procedure37$1,197$32
Preparation of tissue for examination by removing any calcium present87$1,003$11
Pathology examination of tissue using a microscope, moderately low complexity69$762$10
Special stained specimen slides to identify organisms including interpretation and report29$729$24
Pathology examination of tissue using a microscope, limited examination45$172$4

2019: 17 services

Original Medicare services billed in 2019
Pathology examination of tissue using a microscope, intermediate complexity341$30,033$30
Pathology examination of tissue using a microscope, moderately high complexity87$8,717$69
Pathology examination of tissue using a microscope, high complexity35$5,287$123
Antibody evaluation, each additional single antibody stain procedure25$4,820$24
Special stained specimen slides to examine tissue, each additional procedure53$3,639$24
Special stained specimen slides to examine tissue, initial procedure81$3,095$29
Surgical pathology, gross and microscopic examinations, for prostate needle biopsy, any method14$2,124$152
Electron microscopy for diagnosis28$1,892$63
Special stained specimen slides to examine tissue including interpretation and report54$1,384$10
Surgical pathology consultation and report on referred slides prepared elsewhere17$1,196$70
Special stained specimen slides to identify organisms including interpretation and report47$1,181$22
Antibody evaluation, initial single antibody stain procedure28$926$30
Special stained specimen slides to examine tissue, each multiplex procedure14$759$32
Pathology examination of tissue using a microscope, moderately low complexity58$619$9
Preparation of tissue for examination by removing any calcium present37$412$11
Examination of archival tissue for genetic analysis17$284$17
Pathology examination of tissue using a microscope, limited examination21$90$4

2018: 3 services

Original Medicare services billed in 2018
Pathology examination of tissue using a microscope, intermediate complexity16$586$33
Special stained specimen slides to identify organisms including interpretation and report13$343$23
Special stained specimen slides to examine tissue including interpretation and report11$224$10

Medicaid work

$16,588 in 2024

Medicaid paid $16,588 for 316 billed services this clinician did in 2024, up to 55 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 PATHOLOGIST243$14,121
Immunohistochemistry or immunocytochemistry, per specimen; initial single antibody stain procedure42$1,629
TISSUE EXAM BY PATHOLOGIST31$838
Medicaid work by year
2024316355$16,588
2023540684$27,261
2022327451$17,268
2021309354$16,287
2020284357$13,620
2019543336$19,905
See the largest Medicaid services in earlier years

2023

Largest Medicaid services in 2023
TISSUE EXAM BY PATHOLOGIST372$20,402
TISSUE EXAM BY PATHOLOGIST52$3,340
Immunohistochemistry or immunocytochemistry, per specimen; initial single antibody stain procedure57$2,277
TISSUE EXAM BY PATHOLOGIST25$679
IMHCHEM/IMCYTCHM EA ADD ANTB18$490
DECALCIFICATION PROCEDURE16$74

2022

Largest Medicaid services in 2022
TISSUE EXAM BY PATHOLOGIST276$15,135
Immunohistochemistry or immunocytochemistry, per specimen; initial single antibody stain procedure26$996
TISSUE EXAM BY PATHOLOGIST12$841
TISSUE EXAM BY PATHOLOGIST13$297

2021

Largest Medicaid services in 2021
TISSUE EXAM BY PATHOLOGIST271$14,606
TISSUE EXAM BY PATHOLOGIST17$1,218
TISSUE EXAM BY PATHOLOGIST21$463

2020

Largest Medicaid services in 2020
TISSUE EXAM BY PATHOLOGIST232$11,023
TISSUE EXAM BY PATHOLOGIST26$2,094
TISSUE EXAM BY PATHOLOGIST26$503

2019

Largest Medicaid services in 2019
TISSUE EXAM BY PATHOLOGIST515$18,642
TISSUE EXAM BY PATHOLOGIST16$1,062
TISSUE EXAM BY PATHOLOGIST12$201

Money from drug and device companies

$125 in 2024

Industry payments by year
202411None$125
202112None$36

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
Phathom PharmaceuticalsVoquezna$125
1 payment
  • Meals for Voquezna · 2024-10-06 · $125
See the published payment
Every published payment
Phathom PharmaceuticalsMeals · 2024-10-06Voquezna$125
See earlier years (2021)

2021: $36

Payments by company in 2021
Takeda Pharmaceuticals U.S.A.Entyvio$36
2 payments
  • Meals for Entyvio · 2021-02-11 · $16
  • Meals for Entyvio · 2021-01-14 · $20

Professional record

NPI
1457617110
Licence
CA A133801California A133801: Current · expires 2028-09-30
Gender
Female
More record details
Sole proprietor
No
Taxonomy
Federal specialty code 207ZP0102X (207ZP0102X)
Mailing address
Po Box 232410, San Diego, CA, 92193
NPI first listed
2012-04-06
NPI last updated
2018-09-10

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

Extra NPI addresses: 222 Escuela Ave, Mountain View, CA, 94040