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Julia Jaekyung Chang, MD

Endocrinology · Stanford

NPI 1619330222

Medicare standing
Clear
Enrolled, allowed to bill and order, not excluded
Plans that list them
17
3 carriers
Offices
2

Offices

2 locations · 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

17 plans · 3 carriers

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

17 of 17 plans

Plans whose provider directory lists this clinician
Alignment Health BreathEasy (HMO C-SNP)Alignment Health PlanListedOct 3, 2026
Alignment Health Clarity (HMO C-SNP)Alignment Health PlanListedOct 3, 2026
Alignment Health Harmony (HMO)Alignment Health PlanListedOct 3, 2026
Alignment Health Heart & Diabetes (HMO C-SNP)Alignment Health PlanListedOct 3, 2026
Alignment Health Heart & Diabetes CalPlus (HMO C-SNP)Alignment Health PlanListedOct 3, 2026
Alignment Health Heart & Diabetes Care (HMO C-SNP)Alignment Health PlanListedSep 28, 2026
Alignment Health Heart & Diabetes Choice (HMO C-SNP)Alignment Health PlanListedSep 28, 2026
Alignment Health Honor+ Plan (HMO)Alignment Health PlanListedOct 3, 2026
Alignment Health My Choice CalCare (HMO)Alignment Health PlanListedOct 3, 2026
Alignment Health Silicon (HMO C-SNP)Alignment Health PlanListedOct 3, 2026
Alignment Health smartHMO (HMO)Alignment Health PlanListedOct 3, 2026
Alignment Health the ONE (HMO)Alignment Health PlanListedOct 3, 2026
SCAN Balance (HMO C-SNP)SCAN Health PlanListedOct 3, 2026
SCAN Classic (HMO)SCAN Health PlanListedOct 3, 2026
SCAN MyChoice (HMO)SCAN Health PlanListedOct 3, 2026
SCAN Strive (HMO C-SNP)SCAN Health PlanListedOct 3, 2026
DualConnect (HMO D-SNP)Santa Clara Family Health PlanListedSep 1, 2026

California Medical Board record

Licence A150943 · Current

Licensed to practise in California · since 2017 · expires 2026-11-30 · Case Western Reserve 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.

  • 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

$46,953

Medicare paid this office $46,953 for 218 people.

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

Largest Original Medicare bills
Return visit (30+ min)80$11,453$111
Long return visit (40+ min)57$10,452$145
Long return visit (40+ min)33$5,029$117
Subsequent hospital care with moderate levelof medical decision making at least 50 minutes13$2,975$106
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes23$2,889$116
See all 10 services
Every Original Medicare service billed
Return visit (30+ min)80$11,453$111
Long return visit (40+ min)57$10,452$145
Long return visit (40+ min)33$5,029$117
Subsequent hospital care with moderate levelof medical decision making at least 50 minutes13$2,975$106
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes23$2,889$116
Subsequent hospital care with moderate levelof medical decision making at least 35 minutes21$2,754$71
Return visit (30+ min)31$2,634$75
Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's80$1,438$15
Short return visit (20+ min)14$1,328$89
Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's40$643$14

Who their Medicare patients are

218 Original Medicare patients in 2024. Average age 69 · Under 65 18% · 85 and older 6% · Women 48% · Also on Medicaid 32% · Health risk score 1.72. Above the middle of the specialty; the typical endocrinology clinician is at 1.46.

Conditions among them: High blood pressure 64% · Diabetes 35% · Coronary heart disease 26% · Chronic kidney disease 23% · Heart failure 18% · Cancer 17% · Atrial fibrillation 17% · Depression 17% · COPD 14% · Stroke 12% · Dementia 7%.

The office billed $239,041, Medicare allowed $64,297 and paid $46,953; for 555 services of 17 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
2024218555691.72$239,041$46,953
2023173386701.73$203,761$34,364
2022149287681.87$164,908$28,123
20215168681.21$41,928$8,578

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: 7 services

Original Medicare services billed in 2023
Long return visit (40+ min)70$10,762$111
Return visit (30+ min)82$9,299$76
Subsequent hospital care with moderate levelof medical decision making at least 35 minutes24$3,531$69
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes22$2,804$117
Subsequent hospital care with moderate levelof medical decision making at least 50 minutes16$2,622$101
New patient visit (60+ min)14$2,121$152
Short return visit (20+ min)19$1,195$54

2022: 4 services

Original Medicare services billed in 2022
Return visit (30+ min)65$7,906$78
Long return visit (40+ min)41$7,164$126
New patient visit (60+ min)41$5,930$145
Subsequent hospital care with moderate levelof medical decision making at least 50 minutes16$2,412$93

2021: 2 services

Original Medicare services billed in 2021
New patient visit (60+ min)31$5,168$167
Return visit (30+ min)18$1,925$88

Medicaid work

$7,651 in 2024

Medicaid paid $7,651 for 113 billed services this clinician did in 2024, up to 21 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
Return visit (30+ min)113$7,651
Medicaid work by year
2024113121$7,651
2023283223$15,292
2022212224$13,083
See the largest Medicaid services in earlier years

2023

Largest Medicaid services in 2023
Long return visit (40+ min)117$8,100
Return visit (30+ min)166$7,192

2022

Largest Medicaid services in 2022
Return visit (30+ min)150$8,265
Long return visit (40+ min)62$4,818

Drugs they prescribed that Part D paid

$701,440

Pharmacies billed $701,440 in 2024.

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

Opioids were 0% of their Part D prescriptions (0 of 1,462) in 2024. At or below the middle of the specialty; the typical endocrinology clinician is at 0%.

844 generic and 582 brand-name prescriptions · $701,440 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
Ozempic48$84,608$1,763
Norditropin Flexpro28$75,271$2,688
Mounjaro65$71,106$1,094
Sandostatin Lar Depot16$67,303$4,206
Genotropin22$57,777$2,626
See all 26 drugs
Every Part D drug this clinician prescribed
Ozempic48$84,608$1,763
Norditropin Flexpro28$75,271$2,688
Mounjaro65$71,106$1,094
Sandostatin Lar Depot16$67,303$4,206
Genotropin22$57,777$2,626
Nutropin Aq Nuspin29$57,089$1,969
Jardiance50$56,897$1,138
Actemra14$29,974$2,141
Testosterone85$25,263$297
Januvia11$14,601$1,327
Tresiba Flextouch U-20020$12,339$617
Hydrocortisone159$9,873$62
Tradjenta11$7,550$686
Desmopressin Acetate44$6,993$159
Cabergoline48$6,888$144
Estradiol (Twice Weekly)16$4,568$286
Levothyroxine251$3,666$15
Testosterone Cypionate45$2,212$49
Humalog Kwikpen U-10014$1,860$133
Nano 2nd Gen Pen Needle11$1,799$164
Synthroid24$989$41
Gabapentin12$701$58
Metformin56$579$10
Prednisone44$332$8
Glipizide19$260$14
Alendronate35$255$7

Year by year

Part D prescribing by year
20241,4621850% (0)40%$701,440
20231,2991540% (0)41%$582,381
20226871310% (0)41%$255,449
2021197530% (0)45%$91,009
2020133310% (0)56%$56,566
20191411NoneNone$3,425

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

See the drugs prescribed each year

2023: 25 drugs

Part D drugs prescribed in 2023
Ozempic64$76,886$1,201
Jardiance54$75,182$1,392
Nutropin Aq Nuspin29$58,423$2,015
Sandostatin Lar Depot12$56,032$4,669
Mounjaro42$50,846$1,211
Trulicity28$46,339$1,655
Novolog Flexpen21$17,593$838
Januvia13$17,265$1,328
Testosterone56$16,453$294
Omnitrope15$9,772$651
Tresiba Flextouch U-20013$8,863$682
Hydrocortisone148$8,437$57
Levothyroxine228$6,093$27
Desmopressin Acetate37$5,270$142
Cabergoline54$4,773$88
Cortef12$4,598$383
Desmopressin Acetate11$4,319$393
Estradiol (Twice Weekly)18$2,593$144
Nano 2nd Gen Pen Needle16$1,602$100
Testosterone Cypionate33$1,219$37
Metformin58$961$17
Prednisone50$710$14
Alendronate42$650$15
Glipizide19$552$29
Fludrocortisone Acetate14$330$24

2022: 14 drugs

Part D drugs prescribed in 2022
Ozempic32$45,823$1,432
Trulicity34$39,709$1,168
Jardiance20$22,791$1,140
Novolog Flexpen21$11,070$527
Testosterone20$7,865$393
Tirosint15$2,705$180
Nano 2nd Gen Pen Needle26$2,365$91
Levothyroxine110$1,906$17
Hydrocortisone29$1,450$50
Comfort Ez Pen Needle13$1,068$82
Glipizide24$538$22
Metformin36$337$9
Prednisone24$292$12
Alendronate24$184$8

2021: 2 drugs

Part D drugs prescribed in 2021
Forteo14$51,950$3,711
Levothyroxine34$750$22

2020: 3 drugs

Part D drugs prescribed in 2020
Novolog Flexpen13$18,858$1,451
Trulicity16$15,721$983
Levothyroxine22$507$23

Money from drug and device companies

$154 in 2024

Industry payments by year
202422None$154
202312None$65
202211None$116
202111None$122

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
Abbott LaboratoriesFreestyle Libre 3$121
1 payment
  • Meals for Freestyle Libre 3 · 2024-01-29 · $121
Novo NordiskSogroya$32
1 payment
  • Education for Sogroya · 2024-04-17 · $32
See all 2 published payments
Every published payment
Novo NordiskEducation · 2024-04-17Sogroya$32
Abbott LaboratoriesMeals · 2024-01-29Freestyle Libre 3$121
See earlier years (2023, 2022, 2021)

2023: $65

Payments by company in 2023
Novo NordiskSogroya$65
2 payments
  • Meals for Sogroya · 2023-09-09 · $33
  • Education for Sogroya · 2023-08-04 · $32

2022: $116

Payments by company in 2022
Lilly USAMounjaro$116
1 payment
  • Meals for Mounjaro · 2022-07-14 · $116

2021: $122

Payments by company in 2021
Novo NordiskRybelsus$122
1 payment
  • Meals for Rybelsus · 2021-10-07 · $122

Research money

Money a company paid to run a study. Where it went to their institution, the clinician is named as an investigator and did not receive it; the amount covers the whole study, often across many sites.

Research payments by company and study
Novo Nordisk AS · Sogroya · 2025Their institution$32,907

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
1619330222
Licence
CA A150943California A150943: Current · expires 2026-11-30
Video visits
Lists video visits
Gender
Female
More record details
Sole proprietor
No
Taxonomy
Federal specialty code 207RE0101X (207RE0101X); Internal medicine (207R00000X)
Mailing address
300 Pasteur Dr, Stanford, CA, 94305
NPI first listed
2016-03-31
NPI last updated
2024-04-16
NPI record certified
2024-04-16

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