Thomas Koshy Yohannan, MD
Diagnostic Radiology · Berkeley
- Medicare standing
- Clear
- Enrolled, allowed to bill and order, not excluded
- Plans that list them
- 9
- 1 carrier
- Offices
- 5
- Since medical school
- 15 years
- Univ of Illinois at Chicago College of Dentistry, 2011
Offices
5 locations · UCSF Medical Group Business Services · University of California San Francisco
Hospitals listed: UCSF Medical Center. 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. Yohannan’s office 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 A141527 · Current
Licensed to practise in California · since 2016 · expires 2028-01-31 · University of Illinois College 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.
- UCSF Medical CenterSan Francisco, CAAcute Care Hospital · Voluntary non-profit - Other · Has an emergency department · Birthing-friendlyPart of University of California Health, which runs 12 hospitalsHome of UCSF Helen Diller Family Comprehensive Cancer Center, a National Cancer Institute designated comprehensive cancer centrePatients rate it 4 of 5 · 81% would definitely recommend itOverall rating: 4 of 5 starsWorse than the national rate — Perioperative pulmonary embolism or deep vein thrombosis rate: 4.9 (3.79 to 6.02) · 7,590 cases, Jul 2022 – Jun 2024Worse than the national rate — Rate of inpatient admissions for patients receiving outpatient chemotherapy: 12.8 (11.3 to 14.4) · 2,019 cases, Jan 2024 – Dec 2024Better than the national rate — Death rate among surgical inpatients with serious treatable complications: 139.4 (110.22 to 168.58) · 452 cases, Jul 2022 – Jun 2024Better than the national rate — Central Line Associated Bloodstream Infection (ICU + select Wards): 0.622, Oct 2024 – Sep 2025Better than the national rate — Clostridium Difficile (C.Diff): 0.626, Oct 2024 – Sep 2025Better than the national rate — MRSA Bacteremia: 0.491, Oct 2024 – Sep 2025Better than the national rate — Ratio of unplanned hospital visits after hospital outpatient surgery: 0.8 (0.7 to 1) · 2,336 cases, Jan 2024 – Dec 2024
See every measure and the patient survey for UCSF Medical Center
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: 3 better, 5 the same, 3 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 | 4.9 (3.79 to 6.02) · 7,590 cases | Worse | Jul 2022 – Jun 2024 |
| Rate of inpatient admissions for patients receiving outpatient chemotherapyUnplanned return visits | 12.8 (11.3 to 14.4) · 2,019 cases | Worse | Jan 2024 – Dec 2024 |
| Death rate among surgical inpatients with serious treatable complicationsComplications and deaths | 139.4 (110.22 to 168.58) · 452 cases | Better | Jul 2022 – Jun 2024 |
| Central Line Associated Bloodstream Infection (ICU + select Wards)Infections | 0.622 | Better | Oct 2024 – Sep 2025 |
| Clostridium Difficile (C.Diff)Infections | 0.626 | Better | Oct 2024 – Sep 2025 |
| MRSA BacteremiaInfections | 0.491 | Better | Oct 2024 – Sep 2025 |
| Ratio of unplanned hospital visits after hospital outpatient surgeryUnplanned return visits | 0.8 (0.7 to 1) · 2,336 cases | Better | Jan 2024 – Dec 2024 |
| Abdominopelvic accidental puncture or laceration rateComplications and deaths | 1.24 (0.58 to 1.9) · 4,689 cases | No different | Jul 2022 – Jun 2024 |
| CMS Medicare PSI 90: Patient safety and adverse events compositeComplications and deaths | 1.05 (0.89 to 1.2) | No different | Jul 2022 – Jun 2024 |
| Death rate for CABG surgery patientsComplications and deaths | 1.9 · 89 cases | None | Jul 2022 – Jun 2025 |
| Death rate for COPD patientsComplications and deaths | 7.5 · 85 cases | None | Jul 2022 – Jun 2025 |
| Death rate for heart attack patientsComplications and deaths | 10.1 · 132 cases | None | Jul 2022 – Jun 2025 |
| Death rate for heart failure patientsComplications and deaths | 6.6 · 454 cases | None | Jul 2022 – Jun 2025 |
| Death rate for pneumonia patientsComplications and deaths | 10.3 · 618 cases | None | Jul 2022 – Jun 2025 |
| Death rate for stroke patientsComplications and deaths | 9.6 · 380 cases | None | Jul 2023 – Jun 2025 |
| Hybrid Hospital-Wide All-Cause Risk Standardized Mortality RateComplications and deaths | 2.7 · 5,000 cases | None | Jul 2024 – Jun 2025 |
| Iatrogenic pneumothorax rateComplications and deaths | 0.22 (0.06 to 0.38) · 15,965 cases | No different | Jul 2022 – Jun 2024 |
| In-hospital fall-associated fracture rateComplications and deaths | 0.2 (0.05 to 0.35) · 17,859 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative acute kidney injury requiring dialysis rateComplications and deaths | 0.85 (0 to 1.83) · 4,184 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative hemorrhage or hematoma rateComplications and deaths | 2 (1.1 to 2.9) · 6,516 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative respiratory failure rateComplications and deaths | 7.35 (4.49 to 10.21) · 3,989 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative sepsis rateComplications and deaths | 5 (3.22 to 6.77) · 4,087 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative wound dehiscence rateComplications and deaths | 1.95 (0.74 to 3.15) · 2,034 cases | No different | Jul 2022 – Jun 2024 |
| Pressure ulcer rateComplications and deaths | 0.95 (0.63 to 1.28) · 15,431 cases | No different | Jul 2022 – Jun 2024 |
| Rate of complications for hip/knee replacement patientsComplications and deaths | 4 · 399 cases | None | Apr 2023 – Mar 2025 |
| Catheter Associated Urinary Tract Infections (ICU + select Wards)Infections | 0.899 | No different | Oct 2024 – Sep 2025 |
| SSI - Abdominal HysterectomyInfections | 0.689 | No different | Oct 2024 – Sep 2025 |
| SSI - Colon SurgeryInfections | 1.224 | No different | Oct 2024 – Sep 2025 |
| Acute Myocardial Infarction (AMI) 30-Day Readmission RateUnplanned return visits | 16 · 156 cases | None | Jul 2023 – Jun 2025 |
| Heart failure (HF) 30-Day Readmission RateUnplanned return visits | 20 · 564 cases | None | Jul 2023 – Jun 2025 |
| Hospital return days for heart attack patientsUnplanned return visits | 60.3 · 160 cases | None | Jul 2022 – Jun 2025 |
| Hospital return days for heart failure patientsUnplanned return visits | -9.7 · 550 cases | None | Jul 2022 – Jun 2025 |
| Hospital return days for pneumonia patientsUnplanned return visits | 44.1 · 660 cases | None | Jul 2022 – Jun 2025 |
| Pneumonia (PN) 30-Day Readmission RateUnplanned return visits | 16.8 · 667 cases | None | Jul 2023 – Jun 2025 |
| Rate of emergency department (ED) visits for patients receiving outpatient chemotherapyUnplanned return visits | 5.7 (4.8 to 6.7) · 2,019 cases | No different | Jan 2024 – Dec 2024 |
| Rate of readmission after hip/knee replacementUnplanned return visits | 6 · 421 cases | None | Jul 2023 – Jun 2025 |
| Rate of readmission for CABGUnplanned return visits | 10.5 · 53 cases | None | Jul 2023 – Jun 2025 |
| Rate of readmission for chronic obstructive pulmonary disease (COPD) patientsUnplanned return visits | 20 · 107 cases | None | Jul 2023 – Jun 2025 |
| Rate of unplanned hospital visits after colonoscopy (per 1,000 colonoscopies)Unplanned return visits | 13.9 (11.3 to 17.1) · 3,247 cases | No different | Jan 2022 – Dec 2024 |
What patients said (3,181 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 | 71% |
| Nurses "always" communicated well | 80% |
| Doctors "always" communicated well | 80% |
| Staff "always" explained | 61% |
| Yes, staff "did" give patients this information | 88% |
| Yes, staff "did" give patients information about help after discharge | 87% |
| Doctors "always" explained things so they could understand | 74% |
| Doctors "always" listened carefully | 78% |
| Doctors "always" treated them with courtesy and respect | 86% |
| Patients who gave a rating of "9" or "10" (high) | 76% |
| Staff "always" explained new medications | 75% |
| Nurses "always" explained things so they could understand | 77% |
| Nurses "always" listened carefully | 78% |
| Nurses "always" treated them with courtesy and respect | 86% |
| "Always" quiet at night | 50% |
| "YES", patients would definitely recommend the hospital | 81% |
| Staff "always" explained possible side effects | 46% |
| Yes, staff "did" give patients information about possible symptoms | 90% |
Original Medicare doctor bills
$238,381
Medicare paid this office $238,381 for 817 people.
This is what Medicare paid the clinician — not Medicare Advantage, and not the pharmacy.
| Nuclear medicine study from skull base to mid-thigh with ct scan | 261 | $85,472 | $319 |
| Nuclear medicine study whole body with ct scan | 98 | $47,365 | $460 |
| Nuclear medicine study from skull base to mid-thigh | 107 | $29,363 | $258 |
| Fluorodeoxyglucose f-18 fdg, diagnostic, per study dose, up to 45 millicuries | 79 | $22,800 | $281 |
| Ct scan of abdomen and pelvis with contrast | 84 | $10,391 | $114 |
See all 24 services
| Nuclear medicine study from skull base to mid-thigh with ct scan | 261 | $85,472 | $319 |
| Nuclear medicine study whole body with ct scan | 98 | $47,365 | $460 |
| Nuclear medicine study from skull base to mid-thigh | 107 | $29,363 | $258 |
| Fluorodeoxyglucose f-18 fdg, diagnostic, per study dose, up to 45 millicuries | 79 | $22,800 | $281 |
| Ct scan of abdomen and pelvis with contrast | 84 | $10,391 | $114 |
| Ct scan of chest with contrast | 93 | $6,512 | $65 |
| Nuclear medicine study from skull base to mid-thigh with ct scan | 37 | $3,878 | $99 |
| Nuclear medicine studies of blood flow in heart muscle at rest and with stress with concurrent ct scan | 47 | $3,570 | $76 |
| Nuclear medicine study whole body with ct scan | 33 | $3,292 | $97 |
| Nuclear medicine study limited area with ct scan | 33 | $2,943 | $89 |
| Nuclear medicine study from skull base to mid-thigh | 33 | $2,758 | $79 |
| Nuclear medicine study whole body | 19 | $2,537 | $134 |
| Radioactive drug therapy through a vein | 23 | $2,410 | $83 |
| Ct scan of abdomen and pelvis with contrast | 27 | $2,293 | $76 |
| Nuclear medicine study, spect imaging with concurrent ct scan, at least 2 areas or separate acquisitions, single day imaging, or single area or acquisition over multiple days | 23 | $2,283 | $85 |
| Ct scan of chest with contrast | 29 | $1,589 | $48 |
| Nuclear medicine studies of heart muscle at rest and with stress and spect | 14 | $938 | $67 |
| Nuclear medicine study of lymphatic system | 17 | $830 | $49 |
| Nuclear medicine study, spect imaging with concurrent ct scan, 1 area or single acquisition, single day imaging | 14 | $766 | $55 |
| Nuclear medicine study of bone and/or joint whole body | 19 | $650 | $34 |
| Exercise or drug-induced heart stress test with electrocardiogram (ecg) with supervision by physician | 19 | $358 | $19 |
| Injection of radioactive material for x-ray identification of lymph node | 12 | $303 | $25 |
| Low osmolar contrast material, 300-399 mg/ml iodine concentration, per ml | 16 | $245 | $0 |
| Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician | 19 | $234 | $12 |
Procedures year by year
| Procedure | 2017 | 2018 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|
| Injection of radioactive material for x-ray identification of lymph node | – | – | – | – | – | 12 |
Times billed to Original Medicare each year. A blank year means fewer than 11 people had it, or none: Medicare does not publish smaller counts. Medicare Advantage patients are not included.
Who their Medicare patients are
817 Original Medicare patients in 2024. Average age 74 · Under 65 7% · 85 and older 7% · Women 40% · Also on Medicaid 27% · Health risk score 2.08. Above the middle of the specialty; the typical diagnostic radiology clinician is at 1.7.
Conditions among them: High blood pressure 66% · Cancer 52% · Coronary heart disease 28% · Chronic kidney disease 27% · Diabetes 24% · Depression 22% · Atrial fibrillation 20% · Heart failure 16% · COPD 13% · Stroke 9% · Dementia 8%.
The office billed $2,796,219, Medicare allowed $300,039 and paid $238,381; for 3,532 services of 45 kinds; $245 of it was for drugs given in the office and $238,136 for care.
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 | 817 | 3,532 | 74 | 2.08 | $2,796,219 | $238,381 |
| 2023 | 35 | 41 | 69 | 2.87 | $9,479 | $1,916 |
| 2022 | 38 | 41 | 72 | 2.57 | $12,326 | $1,863 |
| 2021 | 24 | 28 | 71 | 2.82 | $8,503 | $1,475 |
| 2018 | 514 | 554 | 74 | 2.43 | $307,220 | $50,719 |
| 2017 | 361 | 388 | 72 | 2.13 | $215,869 | $37,704 |
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
| Nuclear medicine studies of heart muscle at rest and with stress and spect | 17 | $1,151 | $68 |
2022: 1 service
| Nuclear medicine studies of heart muscle at rest and with stress and spect | 16 | $1,012 | $63 |
2021: 1 service
| Nuclear medicine studies of heart muscle at rest and with stress and spect | 13 | $842 | $65 |
2018: 6 services
| Nuclear medicine study from skull base to mid-thigh with ct scan | 260 | $27,445 | $102 |
| Nuclear medicine study whole body with ct scan | 72 | $7,952 | $102 |
| Nuclear medicine study from skull base to mid-thigh with ct scan | 83 | $7,933 | $93 |
| Nuclear medicine study whole body with ct scan | 34 | $3,752 | $104 |
| Nuclear medicine studies of heart muscle at rest and with stress and spect | 15 | $854 | $57 |
| Dxa bone density measurement of hip, pelvis, spine | 21 | $241 | $11 |
2017: 6 services
| Nuclear medicine study from skull base to mid-thigh with ct scan | 172 | $19,065 | $107 |
| Nuclear medicine study whole body with ct scan | 57 | $6,546 | $107 |
| Nuclear medicine study from skull base to mid-thigh with ct scan | 53 | $5,619 | $106 |
| Nuclear medicine study whole body with ct scan | 26 | $2,832 | $109 |
| Nuclear medicine studies of heart muscle at rest and with stress and spect | 14 | $1,001 | $71 |
| Nuclear medicine study of bone and/or joint whole body | 16 | $610 | $38 |
Medicaid work
$36,093 in 2024
Medicaid paid $36,093 for 126 billed services this clinician did in 2024, up to 22 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.
| Positron emission tomography (PET) with concurrently acquired computed tomography (CT) for attenuation correction and anatomical localization imaging; skull base to mid-thigh | 67 | $32,856 |
| DXA BONE DENSITY STUDY 1/> SITES AXIAL SKEL | 47 | $1,961 |
| Myocardial perfusion imaging, tomographic (SPECT) (including attenuation correction, qualitative or quantitative wall motion, ejection fraction by first pass or gated technique, additional quantification, when performed); multiple studies, at rest and/or stress (exercise or pharmacologic) and/or redistribution and/or rest reinjection | 12 | $1,277 |
| 2024 | 126 | 3 | 22 | $36,093 |
| 2023 | 63 | 1 | 15 | $11 |
| 2018 | 120 | 1 | 26 | $23,074 |
See the largest Medicaid services in earlier years
2023
| DXA BONE DENSITY STUDY 1/> SITES AXIAL SKEL | 63 | $11 |
2018
| Positron emission tomography (PET) with concurrently acquired computed tomography (CT) for attenuation correction and anatomical localization imaging; skull base to mid-thigh | 120 | $23,074 |
Professional record
- NPI
- 1396034096
- Licence
- CA A141527, WI 59915-20California A141527: Current · expires 2028-01-31
- Trained
- Univ of Illinois at Chicago College of Dentistry, 2011 · 15 years ago
- Group
- UCSF Medical Group Business Services · University of California San Francisco
- Gender
- Male
More record details
- Sole proprietor
- No
- Taxonomy
- Diagnostic radiology (2085R0202X)
- Mailing address
- 300 Pasteur Dr, Stanford, CA, 94305
- NPI first listed
- 2011-04-04
- NPI last updated
- 2022-01-14
- NPI record certified
- 2022-01-14
This is when the NPI record was last certified, not a medical board exam.
This office lists an electronic records connection.