Ananya Chattopadhyay, MD
Internal Medicine · San Jose
- Medicare standing
- Clear
- Enrolled, allowed to bill and order, not excluded
- Plans that list them
- Not verified
- Not the same as out of network.
- Offices
- 4
Offices
4 locations · Permanente Medical Group Inc · 10,928 clinicians in this group
Hospitals listed: Kaiser Foundation Hospital-San Jose. 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. Chattopadhyay’s office to ask if they take your plan before you enroll.
California Medical Board record
Licence A89793 · Current
Licensed to practise in California · since 2005 · expires 2028-04-30 · University of Calcutta 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.
- Kaiser Foundation Hospital-San JoseSan Jose, CAAcute Care Hospital · Voluntary non-profit - Private · Has an emergency department · Birthing-friendlyPart of Kaiser Permanente, which runs 41 hospitals in 3 statesPatients rate it 3 of 5 · 66% would definitely recommend itOverall rating: 3 of 5 starsBetter than the national rate — Clostridium Difficile (C.Diff): 0.258, Oct 2024 – Sep 2025
See every measure and the patient survey for Kaiser Foundation Hospital-San Jose
Behind the star rating — Deaths: 0 better, 3 the same, 0 worse of 3 measures. Safety: 1 better, 5 the same, 0 worse of 6 measures. Readmissions: 0 better, 2 the same, 0 worse of 2 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 | 0.258 | Better | Oct 2024 – Sep 2025 |
| Abdominopelvic accidental puncture or laceration rateComplications and deaths | 1.3 (0.22 to 2.37) · 181 cases | No different | Jul 2022 – Jun 2024 |
| CMS Medicare PSI 90: Patient safety and adverse events compositeComplications and deaths | 0.89 (0.43 to 1.34) | No different | Jul 2022 – Jun 2024 |
| Death rate for pneumonia patientsComplications and deaths | 14.2 · 27 cases | None | Jul 2022 – Jun 2025 |
| Death rate for stroke patientsComplications and deaths | 11.6 · 271 cases | None | Jul 2023 – Jun 2025 |
| Hybrid Hospital-Wide All-Cause Risk Standardized Mortality RateComplications and deaths | 3.8 · 2,952 cases | None | Jul 2024 – Jun 2025 |
| Iatrogenic pneumothorax rateComplications and deaths | 0.27 (0.04 to 0.5) · 894 cases | No different | Jul 2022 – Jun 2024 |
| In-hospital fall-associated fracture rateComplications and deaths | 0.26 (0.05 to 0.48) · 908 cases | No different | Jul 2022 – Jun 2024 |
| Perioperative pulmonary embolism or deep vein thrombosis rateComplications and deaths | 3.19 (0.67 to 5.72) · 176 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative acute kidney injury requiring dialysis rateComplications and deaths | 1.63 (0 to 3.34) · 61 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative hemorrhage or hematoma rateComplications and deaths | 2.23 (0.53 to 3.92) · 168 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative respiratory failure rateComplications and deaths | 8.11 (0 to 17.58) · 68 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative sepsis rateComplications and deaths | 4.85 (0.67 to 9.03) · 63 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative wound dehiscence rateComplications and deaths | 1.74 (0.22 to 3.26) · 51 cases | No different | Jul 2022 – Jun 2024 |
| Pressure ulcer rateComplications and deaths | 0.43 (0 to 1.53) · 630 cases | No different | Jul 2022 – Jun 2024 |
| Rate of complications for hip/knee replacement patientsComplications and deaths | 4 · 48 cases | None | Apr 2023 – Mar 2025 |
| Catheter Associated Urinary Tract Infections (ICU + select Wards)Infections | 1 | No different | Oct 2024 – Sep 2025 |
| Central Line Associated Bloodstream Infection (ICU + select Wards)Infections | 0.843 | No different | Oct 2024 – Sep 2025 |
| MRSA BacteremiaInfections | 0.88 | No different | Oct 2024 – Sep 2025 |
| SSI - Colon SurgeryInfections | 0.611 | No different | Oct 2024 – Sep 2025 |
| Acute Myocardial Infarction (AMI) 30-Day Readmission RateUnplanned return visits | 15 · 171 cases | None | Jul 2023 – Jun 2025 |
| Heart failure (HF) 30-Day Readmission RateUnplanned return visits | 20.9 · 571 cases | None | Jul 2023 – Jun 2025 |
| Hospital return days for pneumonia patientsUnplanned return visits | 147.1 · 28 cases | None | Jul 2022 – Jun 2025 |
| Pneumonia (PN) 30-Day Readmission RateUnplanned return visits | 21 · 639 cases | None | Jul 2023 – Jun 2025 |
| Rate of readmission after hip/knee replacementUnplanned return visits | 5.6 · 48 cases | None | Jul 2023 – Jun 2025 |
| Rate of readmission for chronic obstructive pulmonary disease (COPD) patientsUnplanned return visits | 19.7 · 157 cases | None | Jul 2023 – Jun 2025 |
What patients said (1,294 patients answered, 21% of those asked)
| Cleanliness | 4 |
| Nurse communication | 2 |
| Doctor communication | 4 |
| Communication about medicines | 2 |
| Discharge information | 3 |
| Overall hospital rating | 2 |
| Quietness | 1 |
| Recommend hospital | 3 |
| Room was "always" clean | 71% |
| Nurses "always" communicated well | 70% |
| Doctors "always" communicated well | 79% |
| Staff "always" explained | 54% |
| Yes, staff "did" give patients this information | 85% |
| Yes, staff "did" give patients information about help after discharge | 85% |
| Doctors "always" explained things so they could understand | 71% |
| Doctors "always" listened carefully | 79% |
| Doctors "always" treated them with courtesy and respect | 85% |
| Patients who gave a rating of "9" or "10" (high) | 61% |
| 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 | 78% |
| "Always" quiet at night | 37% |
| "YES", patients would definitely recommend the hospital | 66% |
| Staff "always" explained possible side effects | 41% |
| Yes, staff "did" give patients information about possible symptoms | 85% |
Original Medicare doctor bills
$3,298
Medicare paid this office $3,298 for 22 people.
This is what Medicare paid the clinician — not Medicare Advantage, and not the pharmacy.
Who their Medicare patients are
22 Original Medicare patients in 2024. Average age 78 · Health risk score 2.74. Above the middle of the specialty; the typical internal medicine clinician is at 1.76.
Conditions among them: High blood pressure 75% · Diabetes 68%.
The office billed $8,943, Medicare allowed $4,140 and paid $3,298; for 40 services of 6 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 | 22 | 40 | 78 | 2.74 | $8,943 | $3,298 |
| 2023 | 18 | 40 | 69 | 3.11 | $6,890 | $3,013 |
| 2022 | 19 | 54 | 62 | 3.21 | $9,587 | $3,600 |
| 2021 | 31 | 69 | 70 | 4.56 | $12,362 | $4,914 |
| 2020 | 30 | 64 | 69 | 2.39 | $10,525 | $4,331 |
| 2019 | 22 | 38 | 72 | 2.30 | $7,897 | $2,684 |
| 2018 | 22 | 54 | 68 | 4.42 | $11,026 | $3,818 |
| 2017 | 29 | 66 | 72 | 2.94 | $11,857 | $3,987 |
| 2016 | 15 | 45 | 72 | 4.13 | $9,415 | $2,678 |
| 2015 | 16 | 16 | 74 | 2.95 | $4,818 | $1,360 |
| 2014 | 11 | 11 | 71 | 1.31 | $3,015 | $1,047 |
| 2013 | 13 | 13 | 72 | 2.55 | $4,090 | $1,248 |
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
2021: 2 services
| Subsequent hospital care with moderate levelof medical decision making at least 35 minutes | 18 | $2,807 | $65 |
| Hospital discharge day management, 30 minutes or less | 11 | $739 | $67 |
2020: 1 service
| Subsequent hospital care with moderate levelof medical decision making at least 35 minutes | 16 | $2,926 | $66 |
2017: 1 service
| Subsequent hospital care with moderate levelof medical decision making at least 35 minutes | 15 | $1,690 | $60 |
Drugs they prescribed that Part D paid
$19,488
Pharmacies billed $19,488 in 2024.
This is pharmacy cost, not the office bill, and not what patients paid.
285 generic and fewer than 11 brand-name prescriptions · $19,488 in drug cost · 66 antibiotic prescriptions to 41 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.
| Cefpodoxime Proxetil | 23 | $481 | $21 |
| Atorvastatin | 23 | $250 | $11 |
| Doxycycline Monohydrate | 23 | $192 | $8 |
| Metoprolol | 19 | $158 | $8 |
| Metoprolol | 15 | $155 | $10 |
See all 6 drugs
| Cefpodoxime Proxetil | 23 | $481 | $21 |
| Atorvastatin | 23 | $250 | $11 |
| Doxycycline Monohydrate | 23 | $192 | $8 |
| Metoprolol | 19 | $158 | $8 |
| Metoprolol | 15 | $155 | $10 |
| Furosemide | 15 | $148 | $10 |
Year by year
| 2024 | 330 | 115 | None | None | $19,488 |
| 2023 | 280 | 111 | 4% (12) | None | $12,750 |
| 2022 | 242 | 101 | None | 16% | $9,166 |
| 2021 | 206 | 86 | None | None | $14,122 |
| 2020 | 339 | 168 | 4% (15) | None | $19,852 |
| 2019 | 428 | 247 | 3% (12) | None | $18,313 |
| 2018 | 357 | 138 | 3% (12) | None | $18,868 |
| 2017 | 267 | 117 | 5% (14) | 21% | $13,067 |
| 2016 | 164 | 76 | None | 20% | $9,228 |
Part D prescriptions only. A drug prescribed to fewer than 11 people in a year is hidden.
See the drugs prescribed each year
2023: 3 drugs
| Furosemide | 19 | $167 | $9 |
| Atorvastatin | 12 | $143 | $12 |
| Metoprolol | 14 | $137 | $10 |
2022: 4 drugs
| Atorvastatin | 14 | $182 | $13 |
| Furosemide | 15 | $137 | $9 |
| Metoprolol | 12 | $118 | $10 |
| Ciprofloxacin | 11 | $74 | $7 |
2021: 1 drug
| Furosemide | 13 | $156 | $12 |
2020: 3 drugs
| Atorvastatin | 12 | $189 | $16 |
| Lisinopril | 13 | $151 | $12 |
| Furosemide | 13 | $106 | $8 |
2019: 8 drugs
| Atorvastatin | 20 | $367 | $18 |
| Atenolol | 15 | $178 | $12 |
| Losartan | 13 | $177 | $14 |
| Furosemide | 17 | $163 | $10 |
| Metoprolol | 16 | $163 | $10 |
| Lisinopril | 14 | $135 | $10 |
| Warfarin | 11 | $135 | $12 |
| Ciprofloxacin | 11 | $77 | $7 |
2018: 9 drugs
| Cefpodoxime Proxetil | 11 | $548 | $50 |
| Levofloxacin | 16 | $510 | $32 |
| Hydralazine | 14 | $260 | $19 |
| Doxycycline Monohydrate | 19 | $217 | $11 |
| Atorvastatin | 14 | $199 | $14 |
| Furosemide | 17 | $129 | $8 |
| Prednisone | 17 | $124 | $7 |
| Metoprolol | 16 | $102 | $6 |
| Ciprofloxacin | 12 | $97 | $8 |
2017: 4 drugs
| Furosemide | 14 | $119 | $9 |
| Ciprofloxacin | 13 | $113 | $9 |
| Levofloxacin | 14 | $109 | $8 |
| Metoprolol | 15 | $104 | $7 |
2016: 3 drugs
| Levofloxacin | 17 | $248 | $15 |
| Prednisone | 13 | $194 | $15 |
| Warfarin | 11 | $82 | $7 |
Professional record
- NPI
- 1487726147
- Licence
- CA A89793California A89793: Current · expires 2028-04-30
- Gender
- Female
More record details
- Sole proprietor
- No
- Medicaid ID
- CA 00A897930
- Taxonomy
- Hospitalist (208M00000X)
- Mailing address
- 1800 Harrison St Fl 7, Oakland, CA, 94612
- NPI first listed
- 2006-11-15
- NPI last updated
- 2022-01-10
This is when the NPI record was last certified, not a medical board exam.
This office lists an electronic records connection.