David S Chang, MD
Orthopedic Surgery · Oakland
- Medicare standing
- Clear
- Enrolled, allowed to bill and order, not excluded
- Plans that list them
- 9
- 1 carrier
- Office
- 1
- Since medical school
- 26 years
- Wake Forest University School of Medicine, 2000
Offices
1 location
Looking this up.
Hospitals listed: Alta Bates Summit Medical Center - Alta Bates Camp. That is not proof they admit you there this week.
Plans that list them
9 plans · 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 (510) 834-2276 to confirm they take your plan. Ask about the office you use, its medical group, referrals and appointments.
| Alignment Health BreathEasy (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Clarity (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Harmony (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Heart & Diabetes (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Heart & Diabetes CalPlus (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Heart & Diabetes Care (HMO C-SNP) | Alignment Health Plan | Listed | Sep 28, 2026 |
| Alignment Health Heart & Diabetes Choice (HMO C-SNP) | Alignment Health Plan | Listed | Sep 28, 2026 |
| Alignment Health Honor+ Plan (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health My Choice CalCare (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
California Medical Board record
Licence A87115 · Current
Licensed to practise in California · since 2004 · expires 2027-12-31 · Bowman Gray School of Medicine of Wake Forest University.
No disciplinary actions, convictions, malpractice judgments or citations in this record.
Surgery centers they own
- The Surgery Center of Alta Bates Summit Medical CenterAmbulatory Surgery Center · Oakland, CAOwner · accredited by JCInitial Accreditation4 inspections, 4 with deficiencies · last 2017-07-27: Requirements Met
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.
- Alta Bates Summit Medical Center - Alta Bates CampBerkeley, CAAcute Care Hospital · Voluntary non-profit - Private · Has an emergency department · Birthing-friendlyPart of Sutter Health, which runs 27 hospitals in 2 statesPatients rate it 2 of 5 · 67% would definitely recommend itOverall rating: 4 of 5 starsBetter than the national rate — Clostridium Difficile (C.Diff): 0.298, Oct 2024 – Sep 2025
See every measure and the patient survey for Alta Bates Summit Medical Center - Alta Bates Camp
Behind the star rating — Deaths: 2 better, 5 the same, 0 worse of 7 measures. Safety: 2 better, 5 the same, 0 worse of 7 measures. Readmissions: 2 better, 6 the same, 1 worse of 9 measures. The star rating is worked out from an earlier period than the measures below, so the two can disagree.
| Clostridium Difficile (C.Diff)Infections | 0.298 | Better | Oct 2024 – Sep 2025 |
| Abdominopelvic accidental puncture or laceration rateComplications and deaths | 1.18 (0.16 to 2.2) · 730 cases | No different | Jul 2022 – Jun 2024 |
| CMS Medicare PSI 90: Patient safety and adverse events compositeComplications and deaths | 0.87 (0.51 to 1.23) | No different | Jul 2022 – Jun 2024 |
| Death rate among surgical inpatients with serious treatable complicationsComplications and deaths | 188.12 (132.31 to 243.94) · 50 cases | No different | Jul 2022 – Jun 2024 |
| Death rate for COPD patientsComplications and deaths | 6.8 · 50 cases | None | Jul 2022 – Jun 2025 |
| Death rate for heart attack patientsComplications and deaths | 10.8 · 41 cases | None | Jul 2022 – Jun 2025 |
| Death rate for heart failure patientsComplications and deaths | 9.4 · 189 cases | None | Jul 2022 – Jun 2025 |
| Death rate for pneumonia patientsComplications and deaths | 12.6 · 184 cases | None | Jul 2022 – Jun 2025 |
| Death rate for stroke patientsComplications and deaths | 8.7 · 103 cases | None | Jul 2023 – Jun 2025 |
| Hybrid Hospital-Wide All-Cause Risk Standardized Mortality RateComplications and deaths | 2.9 · 1,585 cases | None | Jul 2024 – Jun 2025 |
| Iatrogenic pneumothorax rateComplications and deaths | 0.18 (0 to 0.4) · 3,929 cases | No different | Jul 2022 – Jun 2024 |
| In-hospital fall-associated fracture rateComplications and deaths | 0.31 (0.11 to 0.51) · 3,954 cases | No different | Jul 2022 – Jun 2024 |
| Perioperative pulmonary embolism or deep vein thrombosis rateComplications and deaths | 3.15 (0.95 to 5.36) · 754 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative acute kidney injury requiring dialysis rateComplications and deaths | 1.62 (0 to 3.33) · 325 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative hemorrhage or hematoma rateComplications and deaths | 1.99 (0.39 to 3.59) · 717 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative respiratory failure rateComplications and deaths | 10.85 (2.27 to 19.44) · 326 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative sepsis rateComplications and deaths | 4.79 (1.08 to 8.49) · 302 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative wound dehiscence rateComplications and deaths | 1.68 (0.19 to 3.18) · 184 cases | No different | Jul 2022 – Jun 2024 |
| Pressure ulcer rateComplications and deaths | 0.17 (0 to 0.88) · 3,240 cases | No different | Jul 2022 – Jun 2024 |
| Rate of complications for hip/knee replacement patientsComplications and deaths | 3.4 · 161 cases | None | Apr 2023 – Mar 2025 |
| Catheter Associated Urinary Tract Infections (ICU + select Wards)Infections | 0.207 | No different | Oct 2024 – Sep 2025 |
| Central Line Associated Bloodstream Infection (ICU + select Wards)Infections | 0.48 | No different | Oct 2024 – Sep 2025 |
| MRSA BacteremiaInfections | 0.785 | No different | Oct 2024 – Sep 2025 |
| SSI - Colon SurgeryInfections | 0 | No different | Oct 2024 – Sep 2025 |
| Heart failure (HF) 30-Day Readmission RateUnplanned return visits | 19.4 · 243 cases | None | Jul 2023 – Jun 2025 |
| Hospital return days for heart failure patientsUnplanned return visits | -58.2 · 194 cases | None | Jul 2022 – Jun 2025 |
| Hospital return days for pneumonia patientsUnplanned return visits | -12.3 · 177 cases | None | Jul 2022 – Jun 2025 |
| Pneumonia (PN) 30-Day Readmission RateUnplanned return visits | 16.8 · 209 cases | None | Jul 2023 – Jun 2025 |
| Rate of emergency department (ED) visits for patients receiving outpatient chemotherapyUnplanned return visits | 5.4 (3.8 to 7.5) · 215 cases | No different | Jan 2024 – Dec 2024 |
| Rate of inpatient admissions for patients receiving outpatient chemotherapyUnplanned return visits | 12.2 (9.4 to 15.5) · 215 cases | No different | Jan 2024 – Dec 2024 |
| Rate of readmission after hip/knee replacementUnplanned return visits | 4.8 · 150 cases | None | Jul 2023 – Jun 2025 |
| Rate of readmission for chronic obstructive pulmonary disease (COPD) patientsUnplanned return visits | 19.2 · 81 cases | None | Jul 2023 – Jun 2025 |
| Rate of unplanned hospital visits after colonoscopy (per 1,000 colonoscopies)Unplanned return visits | 13.4 (10 to 18.1) · 315 cases | No different | Jan 2022 – Dec 2024 |
| Ratio of unplanned hospital visits after hospital outpatient surgeryUnplanned return visits | 0.8 (0.6 to 1.2) · 137 cases | No different | Jan 2024 – Dec 2024 |
What patients said (449 patients answered, 15% of those asked)
| Cleanliness | 2 |
| Nurse communication | 2 |
| Doctor communication | 2 |
| Communication about medicines | 2 |
| Discharge information | 2 |
| Overall hospital rating | 2 |
| Quietness | 2 |
| Recommend hospital | 3 |
| Room was "always" clean | 62% |
| Nurses "always" communicated well | 72% |
| Doctors "always" communicated well | 75% |
| Staff "always" explained | 53% |
| Yes, staff "did" give patients this information | 82% |
| Yes, staff "did" give patients information about help after discharge | 82% |
| Doctors "always" explained things so they could understand | 68% |
| Doctors "always" listened carefully | 73% |
| Doctors "always" treated them with courtesy and respect | 83% |
| Patients who gave a rating of "9" or "10" (high) | 58% |
| Staff "always" explained new medications | 67% |
| Nurses "always" explained things so they could understand | 67% |
| Nurses "always" listened carefully | 66% |
| Nurses "always" treated them with courtesy and respect | 81% |
| "Always" quiet at night | 49% |
| "YES", patients would definitely recommend the hospital | 67% |
| Staff "always" explained possible side effects | 38% |
| Yes, staff "did" give patients information about possible symptoms | 83% |
Original Medicare doctor bills
$7,677
Medicare paid this office $7,677 for 30 people.
This is what Medicare paid the clinician — not Medicare Advantage, and not the pharmacy.
| Short return visit (20+ min) | 18 | $1,816 | $70 |
Procedures Medicare counted
| Lower limb (leg) arthroscopy (minimally invasive joint repair) | 1-10 | None |
Who their Medicare patients are
30 Original Medicare patients in 2024. Average age 75 · Women 60% · Health risk score 0.71. At or below the middle of the specialty; the typical orthopedic surgery clinician is at 1.13.
Conditions among them: High blood pressure 50%.
The office billed $28,800, Medicare allowed $10,328 and paid $7,677; for 62 services of 9 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 | 30 | 62 | 75 | 0.71 | $28,800 | $7,677 |
| 2023 | 34 | 73 | 75 | 0.64 | $27,050 | $8,240 |
| 2022 | 41 | 76 | 76 | 0.75 | $24,615 | $6,421 |
| 2021 | 37 | 66 | 75 | 0.75 | $28,975 | $7,027 |
| 2020 | 41 | 76 | 74 | 1.07 | $25,915 | $8,074 |
| 2019 | 55 | 159 | 73 | 0.82 | $64,100 | $19,820 |
| 2018 | 81 | 192 | 75 | 0.90 | $66,225 | $15,463 |
| 2017 | 101 | 250 | 75 | 1.13 | $87,875 | $22,976 |
| 2016 | 109 | 334 | 74 | 0.88 | $137,355 | $29,419 |
| 2015 | 132 | 424 | 74 | 1.09 | $210,145 | $43,120 |
| 2014 | 116 | 289 | 73 | 0.91 | $132,113 | $28,462 |
| 2013 | 119 | 428 | 75 | 1.08 | $169,015 | $35,032 |
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: 1 service
| Short return visit (20+ min) | 22 | $2,703 | $77 |
2022: 2 services
| Short return visit (20+ min) | 19 | $2,544 | $77 |
| New patient visit (30+ min) | 19 | $1,890 | $99 |
2021: 2 services
| Short return visit (20+ min) | 25 | $2,479 | $77 |
| Return visit (30+ min) | 11 | $1,412 | $109 |
2020: 3 services
| Short return visit (20+ min) | 22 | $2,159 | $67 |
| Return visit (30+ min) | 13 | $1,265 | $90 |
| New patient visit (30+ min) | 13 | $1,175 | $90 |
2019: 3 services
| Short return visit (20+ min) | 35 | $4,657 | $62 |
| Return visit (30+ min) | 13 | $1,541 | $96 |
| New patient visit (30+ min) | 16 | $1,529 | $96 |
2018: 3 services
| Short return visit (20+ min) | 58 | $7,216 | $60 |
| New patient visit (30+ min) | 21 | $1,816 | $86 |
| Return visit (30+ min) | 15 | $1,227 | $82 |
2017: 5 services
| Short return visit (20+ min) | 65 | $7,900 | $58 |
| New patient visit (30+ min) | 31 | $2,459 | $79 |
| Return visit (30+ min) | 22 | $2,263 | $87 |
| New patient visit (45+ min) | 13 | $1,589 | $122 |
| Aspiration and/or injection of fluid from large joint | 12 | $1,040 | $50 |
2016: 4 services
| Short return visit (20+ min) | 86 | $11,245 | $58 |
| Return visit (30+ min) | 32 | $4,037 | $86 |
| New patient visit (30+ min) | 27 | $2,282 | $85 |
| New patient visit (45+ min) | 15 | $1,861 | $124 |
2015: 4 services
| Short return visit (20+ min) | 99 | $13,915 | $56 |
| New patient visit (30+ min) | 49 | $3,908 | $80 |
| Return visit (30+ min) | 32 | $3,293 | $87 |
| New patient visit (45+ min) | 15 | $2,048 | $137 |
2014: 3 services
| Short return visit (20+ min) | 85 | $9,822 | $56 |
| New patient visit (30+ min) | 47 | $3,646 | $78 |
| Return visit (30+ min) | 25 | $2,170 | $77 |
2013: 4 services
| Short return visit (20+ min) | 79 | $9,784 | $55 |
| New patient visit (30+ min) | 56 | $4,523 | $81 |
| Return visit (30+ min) | 26 | $3,202 | $82 |
| Aspiration and/or injection of fluid from large joint | 11 | $756 | $42 |
Drugs they prescribed that Part D paid
This is pharmacy cost, not the office bill, and not what patients paid.
Opioids were 24% of their 74 Part D prescriptions in 2016. Surgeons prescribe little besides pain medicine after an operation, so their opioid share runs high.
Part D prescriptions only. A drug prescribed to fewer than 11 people in a year is hidden.
Year by year
| 2020 | 15 | None | None | None | $253 |
| 2019 | 20 | 13 | None | None | $510 |
| 2018 | 28 | 15 | None | 43% | $615 |
| 2017 | 34 | 20 | None | 38% | $911 |
| 2016 | 74 | 43 | 24% (18) | 34% | $5,719 |
| 2015 | 141 | 68 | 15% (21) | 52% | $7,113 |
| 2014 | 144 | 63 | 12% (17) | 51% | $4,653 |
| 2013 | 127 | 54 | 15% (19) | 41% | $6,253 |
Part D prescriptions only. A drug prescribed to fewer than 11 people in a year is hidden.
See the drugs prescribed each year
2016: 4 drugs
| Diclofenac | 15 | $2,415 | $161 |
| Voltaren | 22 | $1,082 | $49 |
| Nabumetone | 14 | $286 | $20 |
| Hydrocodone-Acetaminophen | 15 | $253 | $17 |
2015: 2 drugs
| Voltaren | 63 | $2,980 | $47 |
| Hydrocodone-Acetaminophen | 14 | $297 | $21 |
2014: 5 drugs
| Voltaren | 53 | $2,452 | $46 |
| Prednisolone Acetate | 14 | $618 | $44 |
| Diclofenac | 17 | $215 | $13 |
| Hydrocodone-Acetaminophen | 13 | $121 | $9 |
| Ciprofloxacin | 13 | $94 | $7 |
2013: 2 drugs
| Voltaren | 44 | $1,809 | $41 |
| Hydrocodone-Acetaminophen | 19 | $112 | $6 |
Money from drug and device companies
$107 in 2024
| 2024 | 1 | 1 | None | $107 |
| 2023 | 1 | 1 | None | $71 |
| 2022 | 1 | 2 | None | $57 |
| 2021 | 3 | 3 | None | $1,243 |
Paid work is consulting, speaking, honoraria and royalties, as opposed to meals and travel.
A payment is not proof that care is biased.
| DePuy Synthes Sales | Motoband | $107 | 1 payment
|
See the published payment
| DePuy Synthes Sales | Meals · 2024-10-07 | Motoband | $107 |
See earlier years (2023, 2022, 2021)
2023: $71
| Integra LifeSciences | Integra | $71 | 1 payment
|
2022: $57
| Allergan | Natrelle Saline-Filled Breast Implants | $57 | 2 payments
|
2021: $1,243
| Evolution Surgical | None | $1,200 | 1 payment
|
| DePuy Synthes Sales | Monovisc | $25 | 1 payment
|
| Globus Medical | Ankle Fracture System | $18 | 1 payment
|
Professional record
- NPI
- 1316918881
- Licence
- CA A87115California A87115: Current · expires 2027-12-31
- Trained
- Wake Forest University School of Medicine, 2000 · 26 years ago
- Gender
- Male
More record details
- Sole proprietor
- No
- Taxonomy
- Orthopedic surgery (207X00000X); Federal specialty code 207XX0005X (207XX0005X)
- Mailing address
- 1569 Solano Ave Ste 336, Berkeley, CA, 94707
- NPI first listed
- 2006-01-31
- NPI last updated
- 2016-09-21
This is when the NPI record was last certified, not a medical board exam.