Spencer Michael Chang, MD
Internal Medicine · Stanford
- Medicare standing
- Clear
- Enrolled, allowed to bill and order, not excluded
- Plans that list them
- 1
- 1 carrier
- Office
- 1
Offices
1 location · Stanford Health Care · 3,152 clinicians in this group
Hospitals listed: Stanford Health Care. That is not proof they admit you there this week.
Plans that list them
1 plan · 1 carrier
A missing listing does not mean out of network. Directories change, and a listing does not cover every office. Call Dr. Chang’s office at (650) 723-4000 to confirm they take your plan. Ask about the office you use, its medical group, referrals and appointments.
| DualConnect (HMO D-SNP) | Santa Clara Family Health Plan | Listed | Sep 1, 2026 |
California Medical Board record
Licence A185888 · Current
Licensed to practise in California · since 2023 · expires 2027-06-30 · 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.
- 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 itOverall 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.
| Perioperative pulmonary embolism or deep vein thrombosis rateComplications and deaths | 5.31 (4.24 to 6.37) · 8,661 cases | Worse | Jul 2022 – Jun 2024 |
| Rate of inpatient admissions for patients receiving outpatient chemotherapyUnplanned return visits | 14.1 (12.7 to 15.7) · 2,191 cases | Worse | Jan 2024 – Dec 2024 |
| Postoperative respiratory failure rateComplications and deaths | 4.08 (1.95 to 6.21) · 5,296 cases | Better | Jul 2022 – Jun 2024 |
| Catheter Associated Urinary Tract Infections (ICU + select Wards)Infections | 0.317 | Better | Oct 2024 – Sep 2025 |
| Clostridium Difficile (C.Diff)Infections | 0.446 | Better | Oct 2024 – Sep 2025 |
| SSI - Colon SurgeryInfections | 0.241 | Better | Oct 2024 – Sep 2025 |
| Ratio of unplanned hospital visits after hospital outpatient surgeryUnplanned return visits | 0.7 (0.6 to 0.9) · 3,348 cases | Better | Jan 2024 – Dec 2024 |
| Abdominopelvic accidental puncture or laceration rateComplications and deaths | 1.06 (0.45 to 1.67) · 5,374 cases | No different | Jul 2022 – Jun 2024 |
| CMS Medicare PSI 90: Patient safety and adverse events compositeComplications and deaths | 0.86 (0.72 to 1) | No different | Jul 2022 – Jun 2024 |
| Death rate among surgical inpatients with serious treatable complicationsComplications and deaths | 166.09 (137.88 to 194.3) · 470 cases | No different | Jul 2022 – Jun 2024 |
| Death rate for CABG surgery patientsComplications and deaths | 1.1 · 192 cases | None | Jul 2022 – Jun 2025 |
| Death rate for COPD patientsComplications and deaths | 6.4 · 146 cases | None | Jul 2022 – Jun 2025 |
| Death rate for heart attack patientsComplications and deaths | 9.7 · 253 cases | None | Jul 2022 – Jun 2025 |
| Death rate for heart failure patientsComplications and deaths | 6.3 · 880 cases | None | Jul 2022 – Jun 2025 |
| Death rate for pneumonia patientsComplications and deaths | 10.3 · 935 cases | None | Jul 2022 – Jun 2025 |
| Death rate for stroke patientsComplications and deaths | 8.7 · 501 cases | None | Jul 2023 – Jun 2025 |
| Hybrid Hospital-Wide All-Cause Risk Standardized Mortality RateComplications and deaths | 2.1 · 7,730 cases | None | Jul 2024 – Jun 2025 |
| Iatrogenic pneumothorax rateComplications and deaths | 0.13 (0 to 0.27) · 20,799 cases | No different | Jul 2022 – Jun 2024 |
| In-hospital fall-associated fracture rateComplications and deaths | 0.28 (0.14 to 0.43) · 23,182 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative acute kidney injury requiring dialysis rateComplications and deaths | 0.94 (0.2 to 1.68) · 5,694 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative hemorrhage or hematoma rateComplications and deaths | 2.36 (1.54 to 3.19) · 7,846 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative sepsis rateComplications and deaths | 5.2 (3.76 to 6.64) · 5,603 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative wound dehiscence rateComplications and deaths | 1.38 (0.23 to 2.53) · 2,211 cases | No different | Jul 2022 – Jun 2024 |
| Pressure ulcer rateComplications and deaths | 0.52 (0.21 to 0.83) · 19,915 cases | No different | Jul 2022 – Jun 2024 |
| Rate of complications for hip/knee replacement patientsComplications and deaths | 3.6 · 416 cases | None | Apr 2023 – Mar 2025 |
| Central Line Associated Bloodstream Infection (ICU + select Wards)Infections | 0.869 | No different | Oct 2024 – Sep 2025 |
| MRSA BacteremiaInfections | 0.857 | No different | Oct 2024 – Sep 2025 |
| SSI - Abdominal HysterectomyInfections | 0.368 | No different | Oct 2024 – Sep 2025 |
| Acute Myocardial Infarction (AMI) 30-Day Readmission RateUnplanned return visits | 16.2 · 247 cases | None | Jul 2023 – Jun 2025 |
| Heart failure (HF) 30-Day Readmission RateUnplanned return visits | 20.5 · 1,021 cases | None | Jul 2023 – Jun 2025 |
| Hospital return days for heart attack patientsUnplanned return visits | 47.8 · 258 cases | None | Jul 2022 – Jun 2025 |
| Hospital return days for heart failure patientsUnplanned return visits | -1.6 · 990 cases | None | Jul 2022 – Jun 2025 |
| Hospital return days for pneumonia patientsUnplanned return visits | 20.8 · 976 cases | None | Jul 2022 – Jun 2025 |
| Pneumonia (PN) 30-Day Readmission RateUnplanned return visits | 16.5 · 959 cases | None | Jul 2023 – Jun 2025 |
| Rate of emergency department (ED) visits for patients receiving outpatient chemotherapyUnplanned return visits | 5.2 (4.4 to 6.2) · 2,191 cases | No different | Jan 2024 – Dec 2024 |
| Rate of readmission after hip/knee replacementUnplanned return visits | 5.1 · 425 cases | None | Jul 2023 – Jun 2025 |
| Rate of readmission for CABGUnplanned return visits | 9.6 · 158 cases | None | Jul 2023 – Jun 2025 |
| Rate of readmission for chronic obstructive pulmonary disease (COPD) patientsUnplanned return visits | 19.6 · 183 cases | None | Jul 2023 – Jun 2025 |
| Rate of unplanned hospital visits after colonoscopy (per 1,000 colonoscopies)Unplanned return visits | 12.7 (10.4 to 15.4) · 4,578 cases | No different | Jan 2022 – Dec 2024 |
What patients said (6,810 patients answered, 25% of those asked)
| Cleanliness | 4 |
| Nurse communication | 4 |
| Doctor communication | 4 |
| Communication about medicines | 3 |
| Discharge information | 4 |
| Overall hospital rating | 4 |
| Quietness | 2 |
| Recommend hospital | 5 |
| Room was "always" clean | 75% |
| Nurses "always" communicated well | 82% |
| Doctors "always" communicated well | 81% |
| Staff "always" explained | 63% |
| Yes, staff "did" give patients this information | 89% |
| Yes, staff "did" give patients information about help after discharge | 89% |
| Doctors "always" explained things so they could understand | 76% |
| Doctors "always" listened carefully | 80% |
| Doctors "always" treated them with courtesy and respect | 87% |
| Patients who gave a rating of "9" or "10" (high) | 79% |
| Staff "always" explained new medications | 76% |
| Nurses "always" explained things so they could understand | 77% |
| Nurses "always" listened carefully | 79% |
| Nurses "always" treated them with courtesy and respect | 88% |
| "Always" quiet at night | 53% |
| "YES", patients would definitely recommend the hospital | 83% |
| Staff "always" explained possible side effects | 50% |
| Yes, staff "did" give patients information about possible symptoms | 90% |
Original Medicare doctor bills
$44,768
Medicare paid this office $44,768 for 291 people.
This is what Medicare paid the clinician — not Medicare Advantage, and not the pharmacy.
| Return visit (30+ min) | 93 | $8,540 | $72 |
| Short return visit (20+ min) | 72 | $6,153 | $68 |
| Return visit (30+ min) | 48 | $5,163 | $92 |
| Short return visit (20+ min) | 92 | $4,947 | $49 |
| Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 36 | $4,371 | $121 |
See all 12 services
| Return visit (30+ min) | 93 | $8,540 | $72 |
| Short return visit (20+ min) | 72 | $6,153 | $68 |
| Return visit (30+ min) | 48 | $5,163 | $92 |
| Short return visit (20+ min) | 92 | $4,947 | $49 |
| Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 36 | $4,371 | $121 |
| Long return visit (40+ min) | 17 | $2,186 | $115 |
| 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's | 111 | $1,918 | $14 |
| New patient visit (45+ min) | 13 | $1,761 | $135 |
| New patient visit (45+ min) | 17 | $1,670 | $98 |
| New patient visit (30+ min) | 23 | $1,638 | $71 |
| 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's | 64 | $1,180 | $15 |
| New patient visit (30+ min) | 12 | $705 | $59 |
Who their Medicare patients are
291 Original Medicare patients in 2024. Average age 72 · Under 65 11% · 85 and older 7% · Women 54% · Also on Medicaid 30% · Health risk score 1.45. At or below the middle of the specialty; the typical internal medicine clinician is at 1.76.
Conditions among them: High blood pressure 63% · Diabetes 35% · Coronary heart disease 22% · Chronic kidney disease 22% · Depression 20% · Cancer 16% · Heart failure 13% · COPD 11% · Atrial fibrillation 11% · Dementia 7% · Stroke 7%.
The office billed $229,438, Medicare allowed $62,382 and paid $44,768; for 747 services of 16 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
| 2024 | 291 | 747 | 72 | 1.45 | $229,438 | $44,768 |
| 2023 | 77 | 90 | 72 | 1.45 | $32,830 | $6,776 |
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: 3 services
| Return visit (30+ min) | 29 | $2,327 | $75 |
| Short return visit (20+ min) | 28 | $1,595 | $55 |
| New patient visit (45+ min) | 14 | $1,319 | $94 |
Medicaid work
$1,353 in 2024
Medicaid paid $1,353 for 79 billed services this clinician did in 2024, up to 15 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.
| Return visit (30+ min) | 40 | $762 |
| Short return visit (20+ min) | 39 | $591 |
| 2024 | 79 | 2 | 15 | $1,353 |
Drugs they prescribed that Part D paid
$97,659
Pharmacies billed $97,659 in 2024.
This is pharmacy cost, not the office bill, and not what patients paid.
Opioids were 2% of their Part D prescriptions (26 of 1,135) in 2024. Above the middle of the specialty; the typical internal medicine clinician is at 1%.
959 generic and 158 brand-name prescriptions · $97,659 in drug cost · 22 antibiotic prescriptions to 20 people.
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.
| Trulicity | 25 | $23,009 | $920 |
| Ozempic | 16 | $13,942 | $871 |
| Albuterol Sulfate Hfa | 49 | $1,528 | $31 |
| Gabapentin | 51 | $1,447 | $28 |
| Atorvastatin | 60 | $901 | $15 |
See all 30 drugs
| Trulicity | 25 | $23,009 | $920 |
| Ozempic | 16 | $13,942 | $871 |
| Albuterol Sulfate Hfa | 49 | $1,528 | $31 |
| Gabapentin | 51 | $1,447 | $28 |
| Atorvastatin | 60 | $901 | $15 |
| Tamsulosin | 18 | $591 | $33 |
| Rosuvastatin | 44 | $588 | $13 |
| Losartan | 48 | $475 | $10 |
| Levothyroxine | 34 | $442 | $13 |
| Amlodipine Besylate | 46 | $324 | $7 |
| Oxycodone | 14 | $323 | $23 |
| Omeprazole | 11 | $266 | $24 |
| Metformin | 30 | $264 | $9 |
| Fluticasone Propionate | 28 | $256 | $9 |
| Escitalopram | 19 | $249 | $13 |
| Pantoprazole | 16 | $242 | $15 |
| Mirtazapine | 17 | $217 | $13 |
| Duloxetine | 14 | $210 | $15 |
| Trazodone | 14 | $204 | $15 |
| Lisinopril | 38 | $197 | $5 |
| Hydrocodone-Acetaminophen | 11 | $151 | $14 |
| Metoprolol | 11 | $139 | $13 |
| Metformin Hcl Er | 12 | $136 | $11 |
| Warfarin | 11 | $121 | $11 |
| Ondansetron Odt | 11 | $117 | $11 |
| Celecoxib | 14 | $112 | $8 |
| Zolpidem | 18 | $45 | $3 |
| Alendronate | 12 | $45 | $4 |
| Furosemide | 11 | $40 | $4 |
| Hydrochlorothiazide | 15 | $10 | $1 |
Year by year
| 2024 | 1,135 | 189 | 2% (26) | 14% | $97,659 |
| 2023 | 335 | 58 | None | 16% | $42,906 |
| 2022 | 235 | 32 | 0% (0) | 21% | $40,560 |
| 2021 | 44 | 11 | 0% (0) | None | $2,740 |
Part D prescriptions only. A drug prescribed to fewer than 11 people in a year is hidden.
See the drugs prescribed each year
2023: 6 drugs
| Basaglar Kwikpen U-100 | 11 | $7,774 | $707 |
| Atorvastatin | 54 | $919 | $17 |
| Tamsulosin | 14 | $475 | $34 |
| Lisinopril | 13 | $220 | $17 |
| Metformin | 16 | $211 | $13 |
| Diclofenac | 11 | $156 | $14 |
2022: 3 drugs
| Basaglar Kwikpen U-100 | 11 | $7,666 | $697 |
| Atorvastatin | 30 | $443 | $15 |
| Metformin | 11 | $94 | $9 |
Money from drug and device companies
$1,591 in 2024
A payment is not proof that care is biased.
| Regeneron Healthcare Solutions | Dupixent | $1,456 | 2 payments
|
| Phathom Pharmaceuticals | Voquezna | $135 | 1 payment
|
See all 3 published payments
| Regeneron Healthcare Solutions | Consulting · 2024-12-06 | Dupixent | $364 |
| Regeneron Healthcare Solutions | Consulting · 2024-12-06 | Dupixent | $1,092 |
| Phathom Pharmaceuticals | Meals · 2024-08-28 | Voquezna | $135 |
Professional record
- NPI
- 1275160368
- Licence
- CA A185888California A185888: Current · expires 2027-06-30
- Trained
- Duke University School of Medicine, 2020
- Group
- Stanford Health Care
- Video visits
- Lists video visits
- Gender
- Male
More record details
- Sole proprietor
- No
- Taxonomy
- Internal medicine (207R00000X)
- Mailing address
- 300 Pasteur Dr, Stanford, CA, 94305
- NPI first listed
- 2020-03-26
- NPI last updated
- 2024-04-18
- NPI record certified
- 2024-04-18
This is when the NPI record was last certified, not a medical board exam.