Matthew S Chang, MD
Gastroenterology · San Francisco
- Medicare standing
- Clear
- Enrolled, allowed to bill and order, not excluded
- Plans that list them
- 4
- 1 carrier
- Office
- 1
Offices
1 location · Permanente Medical Group Inc · 10,928 clinicians in this group
Plans that list them
4 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 (415) 833-2871 to confirm they take your plan. Ask about the office you use, its medical group, referrals and appointments.
| Kaiser Permanente Dual Complete North P2 (HMO D-SNP) | Kaiser Permanente | Listed | Sep 1, 2026 |
| Kaiser Permanente Dual Complete North P23 (HMO D-SNP) | Kaiser Permanente | Listed | Sep 1, 2026 |
| Kaiser Permanente Sr Adv Basic Santa Clara (HMO) | Kaiser Permanente | Listed | Sep 1, 2026 |
| Kaiser Permanente Sr Adv Enhanced Santa Clara (HMO) | Kaiser Permanente | Listed | Sep 1, 2026 |
California Medical Board record
Licence A133674 · Current
Licensed to practise in California · since 2014 · expires 2028-12-31 · University of Michigan Medical School.
No disciplinary actions, convictions, malpractice judgments or citations in this record.
Original Medicare doctor bills
This is what Medicare paid the clinician — not Medicare Advantage, and not the pharmacy.
Procedures Medicare counted
| Colonoscopy | 1-10 | None |
| Upper gastrointestinal (GI) endoscopy for acid reflux | 1-10 | None |
Year by year
| 2022 | 12 | 29 | 68 | 1.58 | $25,908 | $5,603 |
| 2017 | 195 | 365 | 68 | 2.03 | $300,353 | $37,026 |
| 2016 | 183 | 353 | 70 | 1.57 | $320,651 | $38,686 |
| 2015 | 140 | 238 | 68 | 1.72 | $252,630 | $30,647 |
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
2017: 11 services
| New patient visit (60+ min) | 53 | $7,350 | $139 |
| Return visit (30+ min) | 33 | $2,604 | $69 |
| Initial hospital care with moderate level of medical decision making at least 75 minutes | 11 | $1,994 | $181 |
| Long return visit (40+ min) | 18 | $1,978 | $104 |
| Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 15 | $1,609 | $107 |
| Biopsy of large bowel using a flexible endoscope | 12 | $1,566 | $130 |
| Subsequent hospital care with moderate levelof medical decision making at least 35 minutes | 14 | $1,484 | $65 |
| Biopsy of large bowel using a flexible endoscope | 11 | $1,448 | $132 |
| Initial hospital care with straightforward or low-level medical decision making at least 55 minutes | 11 | $1,342 | $122 |
| Return visit (30+ min) | 18 | $1,155 | $64 |
| Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito | 26 | $125 | $5 |
2016: 11 services
| New patient visit (60+ min) | 49 | $5,962 | $122 |
| Long return visit (40+ min) | 38 | $4,046 | $96 |
| Initial hospital care with moderate level of medical decision making at least 75 minutes | 19 | $3,425 | $180 |
| New patient visit (60+ min) | 20 | $3,063 | $153 |
| Return visit (30+ min) | 35 | $2,723 | $61 |
| Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 13 | $1,600 | $114 |
| Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 16 | $1,595 | $100 |
| Biopsy of large bowel using a flexible endoscope | 14 | $1,259 | $90 |
| Biopsy of large bowel using a flexible endoscope | 13 | $1,231 | $95 |
| Return visit (30+ min) | 14 | $1,072 | $77 |
| Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 11 | $1,003 | $91 |
2015: 8 services
| New patient visit (60+ min) | 55 | $8,265 | $150 |
| Biopsy of large bowel using a flexible endoscope | 24 | $3,426 | $143 |
| Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 12 | $3,094 | $258 |
| Initial hospital care with straightforward or low-level medical decision making at least 55 minutes | 18 | $2,201 | $122 |
| Return visit (30+ min) | 17 | $1,547 | $70 |
| Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 16 | $1,517 | $95 |
| Long return visit (40+ min) | 14 | $1,394 | $100 |
| New patient visit (45+ min) | 12 | $1,389 | $116 |
Drugs they prescribed that Part D paid
$256,176
Pharmacies billed $256,176 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 616) in 2024. At or below the middle of the specialty; the typical gastroenterology clinician is at 0%.
545 generic and 71 brand-name prescriptions · $256,176 in drug cost · 60 antibiotic prescriptions to 13 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.
| Xifaxan | 48 | $158,905 | $3,311 |
| Ursodiol | 35 | $7,034 | $201 |
| Gavilyte-C | 239 | $5,485 | $23 |
| Lactulose | 17 | $2,048 | $120 |
| Pantoprazole | 64 | $1,014 | $16 |
See all 10 drugs
| Xifaxan | 48 | $158,905 | $3,311 |
| Ursodiol | 35 | $7,034 | $201 |
| Gavilyte-C | 239 | $5,485 | $23 |
| Lactulose | 17 | $2,048 | $120 |
| Pantoprazole | 64 | $1,014 | $16 |
| Spironolactone | 19 | $540 | $28 |
| Carvedilol | 29 | $307 | $11 |
| Azathioprine | 13 | $304 | $23 |
| Furosemide | 21 | $291 | $14 |
| Omeprazole | 17 | $286 | $17 |
Year by year
| 2024 | 616 | 355 | 0% (0) | 12% | $256,176 |
| 2023 | 598 | 397 | 0% (0) | 12% | $181,842 |
| 2022 | 453 | 278 | 0% (0) | 17% | $192,207 |
| 2021 | 455 | 304 | 0% (0) | 17% | $118,302 |
| 2020 | 347 | 203 | 0% (0) | None | $45,169 |
| 2019 | 339 | 264 | None | 11% | $31,978 |
| 2018 | 249 | 123 | 0% (0) | 20% | $19,900 |
| 2017 | 232 | 90 | None | 16% | $12,838 |
| 2016 | 244 | 70 | 0% (0) | 25% | $29,613 |
| 2015 | 142 | 67 | None | 15% | $6,350 |
| 2013 | 30 | None | 0% (0) | None | $1,655 |
Part D prescriptions only. A drug prescribed to fewer than 11 people in a year is hidden.
See the drugs prescribed each year
2023: 9 drugs
| Xifaxan | 39 | $142,503 | $3,654 |
| Ursodiol | 31 | $6,012 | $194 |
| Gavilyte-C | 276 | $5,900 | $21 |
| Pantoprazole | 62 | $2,655 | $43 |
| Twinrix | 11 | $1,281 | $116 |
| Lactulose | 17 | $1,098 | $65 |
| Azathioprine | 13 | $303 | $23 |
| Omeprazole | 18 | $273 | $15 |
| Furosemide | 12 | $132 | $11 |
2022: 9 drugs
| Xifaxan | 15 | $92,184 | $6,146 |
| Ursodiol | 19 | $3,210 | $169 |
| Gavilyte-C | 162 | $2,972 | $18 |
| Lactulose | 19 | $1,347 | $71 |
| Pantoprazole | 58 | $979 | $17 |
| Peg-3350 and Electrolytes | 30 | $616 | $21 |
| Omeprazole | 20 | $341 | $17 |
| Azathioprine | 11 | $298 | $27 |
| Spironolactone | 11 | $140 | $13 |
2021: 6 drugs
| Ursodiol | 19 | $3,851 | $203 |
| Peg-3350 and Electrolytes | 93 | $1,888 | $20 |
| Gavilyte-C | 104 | $1,600 | $15 |
| Pantoprazole | 53 | $1,012 | $19 |
| Lactulose | 15 | $925 | $62 |
| Peg 3350-Electrolyte | 26 | $702 | $27 |
2020: 7 drugs
| Ursodiol | 12 | $2,763 | $230 |
| Gavilyte-C | 91 | $1,791 | $20 |
| Pantoprazole | 51 | $937 | $18 |
| Lactulose | 12 | $516 | $43 |
| Peg-3350 and Electrolytes | 15 | $321 | $21 |
| Omeprazole | 15 | $294 | $20 |
| Furosemide | 13 | $126 | $10 |
2019: 4 drugs
| Gavilyte-C | 205 | $7,470 | $36 |
| Omeprazole | 19 | $346 | $18 |
| Gavilyte-G | 13 | $315 | $24 |
| Pantoprazole | 13 | $260 | $20 |
2018: 4 drugs
| Gavilyte-C | 48 | $1,800 | $38 |
| Pantoprazole | 49 | $1,400 | $29 |
| Peg 3350-Electrolyte | 26 | $941 | $36 |
| Omeprazole | 35 | $782 | $22 |
2017: 3 drugs
| Omeprazole | 68 | $1,188 | $17 |
| Pantoprazole | 42 | $664 | $16 |
| Peg 3350-Electrolyte | 11 | $176 | $16 |
2016: 6 drugs
| Amitiza | 21 | $7,074 | $337 |
| Nexium | 14 | $6,633 | $474 |
| Lialda | 14 | $6,624 | $473 |
| Polyethylene Glycol 3350 | 22 | $1,252 | $57 |
| Omeprazole | 50 | $606 | $12 |
| Pantoprazole | 33 | $542 | $16 |
2015: 2 drugs
| Polyethylene Glycol 3350 | 18 | $681 | $38 |
| Omeprazole | 34 | $451 | $13 |
Money from drug and device companies
$34 in 2025
| 2025 | 1 | 1 | None | $34 |
| 2024 | 1 | 1 | None | $24 |
Paid work is consulting, speaking, honoraria and royalties, as opposed to meals and travel.
A payment is not proof that care is biased.
| Abbvie | None | $34 | 1 payment
|
See the published payment
| Abbvie | Meals · 2025-05-14 | None | $34 |
See earlier years (2024)
2024: $24
| Abbvie | Ozurdex | $24 | 1 payment
|
Professional record
- NPI
- 1598949521
- Licence
- CA A133674, MA 250090, NY 245746California A133674: Current · expires 2028-12-31
- Trained
- University of Michigan Medical School, 2006
- Gender
- Male
More record details
- Sole proprietor
- No
- Taxonomy
- Federal specialty code 207RG0100X (207RG0100X); Internal medicine (207R00000X)
- Mailing address
- 900 Blake Wilbur Dr, Palo Alto, CA, 94304
- NPI first listed
- 2007-12-27
- NPI last updated
- 2021-12-17
This is when the NPI record was last certified, not a medical board exam.
This office lists an electronic records connection.