Barry M Chauser, MD

Offices

3 locations · Northern California Radiation Therapists and Oncologists Medical Group · 8 clinicians in this group

Looking this up.

Hospitals listed: UCSF Health Stanyan Hospital. That is not proof they admit you there this week.

Plans that list them

12 plans · 2 carriers

A missing listing does not mean out of network. Directories change, and a listing does not cover every office. Call Dr. Chauser’s office to confirm they take your plan. Ask about the office you use, its medical group, referrals and appointments.

12 of 12 plans

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Plans whose provider directory lists this clinician

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
Imperial Courage Plan (HMO)	Imperial Health Plan of California, Inc.	Listed	Sep 1, 2026
Imperial Dynamic Plan (HMO)	Imperial Health Plan of California, Inc.	Listed	Sep 1, 2026
Imperial Senior Value (HMO C-SNP)	Imperial Health Plan of California, Inc.	Listed	Sep 1, 2026

California Medical Board record

Licence G12439 · Current

Licensed to practise in California · since 1966 · expires 2027-07-31 · University of Pittsburgh 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.

UCSF Health St. Mary'S HospitalSan Francisco, CAAcute Care Hospital · Voluntary non-profit - Private · Has an emergency departmentPart of CommonSpirit Health, which runs 145 hospitals in 19 statesPatients rate it 2 of 5 · 60% would definitely recommend it
Overall rating: 4 of 5 starsBetter than the national rate — Clostridium Difficile (C.Diff): 0, Oct 2024 – Sep 2025

See every measure and the patient survey for UCSF Health St. Mary'S Hospital

Behind the star rating — Deaths: 2 better, 5 the same, 0 worse of 7 measures. Safety: 1 better, 5 the same, 0 worse of 6 measures. Readmissions: 0 better, 9 the same, 0 worse of 9 measures. The star rating is worked out from an earlier period than the measures below, so the two can disagree.

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Every scored measure at UCSF Health St. Mary'S Hospital

Clostridium Difficile (C.Diff)Infections	0	Better	Oct 2024 – Sep 2025
Abdominopelvic accidental puncture or laceration rateComplications and deaths	0.95 (0 to 1.99) · 413 cases	No different	Jul 2022 – Jun 2024
CMS Medicare PSI 90: Patient safety and adverse events compositeComplications and deaths	0.96 (0.58 to 1.34)	No different	Jul 2022 – Jun 2024
Death rate among surgical inpatients with serious treatable complicationsComplications and deaths	146.74 (92.54 to 200.93) · 30 cases	No different	Jul 2022 – Jun 2024
Death rate for COPD patientsComplications and deaths	7.4 · 35 cases	None	Jul 2022 – Jun 2025
Death rate for heart attack patientsComplications and deaths	11.8 · 51 cases	None	Jul 2022 – Jun 2025
Death rate for heart failure patientsComplications and deaths	9.6 · 220 cases	None	Jul 2022 – Jun 2025
Death rate for pneumonia patientsComplications and deaths	9.3 · 165 cases	None	Jul 2022 – Jun 2025
Death rate for stroke patientsComplications and deaths	9.4 · 102 cases	None	Jul 2023 – Jun 2025
Hybrid Hospital-Wide All-Cause Risk Standardized Mortality RateComplications and deaths	2.9 · 1,363 cases	None	Jul 2024 – Jun 2025
Iatrogenic pneumothorax rateComplications and deaths	0.24 (0.02 to 0.46) · 2,530 cases	No different	Jul 2022 – Jun 2024
In-hospital fall-associated fracture rateComplications and deaths	0.32 (0.12 to 0.53) · 2,519 cases	No different	Jul 2022 – Jun 2024
Perioperative pulmonary embolism or deep vein thrombosis rateComplications and deaths	3.02 (0.73 to 5.31) · 590 cases	No different	Jul 2022 – Jun 2024
Postoperative acute kidney injury requiring dialysis rateComplications and deaths	1.63 (0 to 3.35) · 238 cases	No different	Jul 2022 – Jun 2024
Postoperative hemorrhage or hematoma rateComplications and deaths	2.07 (0.43 to 3.7) · 554 cases	No different	Jul 2022 – Jun 2024
Postoperative respiratory failure rateComplications and deaths	12.7 (4.19 to 21.21) · 259 cases	No different	Jul 2022 – Jun 2024
Postoperative sepsis rateComplications and deaths	5.67 (1.51 to 9.83) · 203 cases	No different	Jul 2022 – Jun 2024
Postoperative wound dehiscence rateComplications and deaths	1.7 (0.19 to 3.2) · 168 cases	No different	Jul 2022 – Jun 2024
Pressure ulcer rateComplications and deaths	0.21 (0 to 0.99) · 2,258 cases	No different	Jul 2022 – Jun 2024
Rate of complications for hip/knee replacement patientsComplications and deaths	3.2 · 158 cases	None	Apr 2023 – Mar 2025
Catheter Associated Urinary Tract Infections (ICU + select Wards)Infections	0	No different	Oct 2024 – Sep 2025
Central Line Associated Bloodstream Infection (ICU + select Wards)Infections	0	No different	Oct 2024 – Sep 2025
MRSA BacteremiaInfections	0	No different	Oct 2024 – Sep 2025
Acute Myocardial Infarction (AMI) 30-Day Readmission RateUnplanned return visits	14.6 · 61 cases	None	Jul 2023 – Jun 2025
Heart failure (HF) 30-Day Readmission RateUnplanned return visits	21.1 · 291 cases	None	Jul 2023 – Jun 2025
Hospital return days for heart failure patientsUnplanned return visits	-3.4 · 251 cases	None	Jul 2022 – Jun 2025
Hospital return days for pneumonia patientsUnplanned return visits	5.5 · 189 cases	None	Jul 2022 – Jun 2025
Pneumonia (PN) 30-Day Readmission RateUnplanned return visits	16.1 · 213 cases	None	Jul 2023 – Jun 2025
Rate of emergency department (ED) visits for patients receiving outpatient chemotherapyUnplanned return visits	5.7 (3.7 to 8.5) · 30 cases	No different	Jan 2024 – Dec 2024
Rate of inpatient admissions for patients receiving outpatient chemotherapyUnplanned return visits	12 (8.3 to 17.1) · 30 cases	No different	Jan 2024 – Dec 2024
Rate of readmission after hip/knee replacementUnplanned return visits	4.5 · 176 cases	None	Jul 2023 – Jun 2025
Rate of readmission for chronic obstructive pulmonary disease (COPD) patientsUnplanned return visits	20.3 · 61 cases	None	Jul 2023 – Jun 2025
Rate of unplanned hospital visits after colonoscopy (per 1,000 colonoscopies)Unplanned return visits	13.1 (9.6 to 17.8) · 192 cases	No different	Jan 2022 – Dec 2024
Ratio of unplanned hospital visits after hospital outpatient surgeryUnplanned return visits	1 (0.7 to 1.5) · 113 cases	No different	Jan 2024 – Dec 2024

What patients said (587 patients answered, 20% of those asked)

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Patient survey stars by topic at UCSF Health St. Mary'S Hospital

Cleanliness	3
Nurse communication	2
Doctor communication	2
Communication about medicines	2
Discharge information	4
Overall hospital rating	2
Quietness	1
Recommend hospital	2

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Share of patients giving the best answer at UCSF Health St. Mary'S Hospital

Room was "always" clean	66%
Nurses "always" communicated well	73%
Doctors "always" communicated well	76%
Staff "always" explained	60%
Yes, staff "did" give patients this information	87%
Yes, staff "did" give patients information about help after discharge	86%
Doctors "always" explained things so they could understand	71%
Doctors "always" listened carefully	76%
Doctors "always" treated them with courtesy and respect	82%
Patients who gave a rating of "9" or "10" (high)	58%
Staff "always" explained new medications	73%
Nurses "always" explained things so they could understand	70%
Nurses "always" listened carefully	72%
Nurses "always" treated them with courtesy and respect	78%
"Always" quiet at night	41%
"YES", patients would definitely recommend the hospital	60%
Staff "always" explained possible side effects	48%
Yes, staff "did" give patients information about possible symptoms	88%

Original Medicare doctor bills

$26,739

Medicare paid this office $26,739 for 47 people.

This is what Medicare paid the clinician — not Medicare Advantage, and not the pharmacy.

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Largest Original Medicare bills

Radiation treatment management, 5 treatment sessions	13	$5,945	$175
3d radiation therapy planning	14	$3,311	$195
Design and construction of complex radiation treatment device	16	$3,025	$50
New patient visit (60+ min)	15	$2,418	$161
Calculation of radiation therapy dose	16	$2,166	$26

See all 9 services

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Every Original Medicare service billed

Radiation treatment management, 5 treatment sessions	13	$5,945	$175
3d radiation therapy planning	14	$3,311	$195
Design and construction of complex radiation treatment device	16	$3,025	$50
New patient visit (60+ min)	15	$2,418	$161
Calculation of radiation therapy dose	16	$2,166	$26
Complex radiation therapy planning	14	$2,125	$152
Obtaining data needed to develop the optimal radiation treatment, 3 or more treatment areas or any number of treatment areas where special treatment is involved	12	$985	$70
Short return visit (20+ min)	13	$785	$56
Short return visit	12	$374	$27

Who their Medicare patients are

47 Original Medicare patients in 2024. Average age 77 · Women 62% · Also on Medicaid 36% · Health risk score 2.35. Sicker patients than 9 in 10 peers; the typical radiation oncology clinician is at 1.69.

Conditions among them: High blood pressure 75% · Cancer 75% · Chronic kidney disease 38% · Diabetes 34% · Coronary heart disease 34%.

The office billed $119,148, Medicare allowed $33,891 and paid $26,739; for 324 services of 22 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

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Original Medicare by year

2024	47	324	77	2.35	$119,148	$26,739
2023	42	174	76	1.21	$68,390	$15,966
2022	22	138	77	1.54	$37,910	$8,888
2021	30	267	76	1.61	$86,913	$20,707
2020	37	196	77	2.32	$59,196	$14,111
2019	56	387	77	1.67	$116,695	$27,122
2018	58	349	78	1.70	$113,833	$25,375
2017	58	606	76	1.67	$222,777	$47,174
2016	64	499	75	1.62	$200,439	$46,156
2015	36	371	77	2.57	$154,314	$35,228
2014	62	942	76	2.43	$307,130	$69,840
2013	80	1,308	77	1.51	$432,322	$94,890

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: 2 services

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Original Medicare services billed in 2023

Short return visit (20+ min)	14	$1,137	$57
Short return visit	17	$457	$27

2021: 1 service

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Original Medicare services billed in 2021

Short return visit (20+ min)	14	$851	$57

2020: 1 service

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Original Medicare services billed in 2020

Short return visit (20+ min)	17	$921	$44

2019: 6 services

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Original Medicare services billed in 2019

Complex radiation therapy planning	15	$2,264	$151
Design and construction of complex radiation treatment device	12	$1,815	$55
Short return visit (20+ min)	20	$1,313	$45
New patient visit (30+ min)	18	$1,204	$67
Calculation of radiation therapy dose	12	$742	$30
Short return visit	12	$270	$21

2018: 3 services

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Original Medicare services billed in 2018

Radiation treatment management, 5 treatment sessions	15	$10,473	$164
Short return visit (20+ min)	11	$478	$43
Short return visit	15	$328	$22

2017: 7 services

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Original Medicare services billed in 2017

Radiation treatment management, 5 treatment sessions	31	$19,186	$155
Design and construction of complex radiation treatment device	25	$5,034	$50
Complex radiation therapy planning	26	$3,741	$139
3d radiation therapy planning	17	$3,374	$187
Calculation of radiation therapy dose	25	$1,123	$27
Obtaining data needed to develop the optimal radiation treatment, 3 or more treatment areas or any number of treatment areas where special treatment is involved	15	$1,096	$69
New patient visit (30+ min)	15	$944	$63

2016: 8 services

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Original Medicare services billed in 2016

Radiation treatment management, 5 treatment sessions	26	$17,771	$168
Design and construction of complex radiation treatment device	27	$5,293	$58
3d radiation therapy planning	18	$4,221	$201
Complex radiation therapy planning	25	$4,002	$148
New patient visit (60+ min)	13	$1,948	$150
New patient visit (30+ min)	28	$1,839	$66
Obtaining data needed to develop the optimal radiation treatment, 3 or more treatment areas or any number of treatment areas where special treatment is involved	20	$1,690	$73
Calculation of radiation therapy dose	30	$1,516	$29

2015: 7 services

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Original Medicare services billed in 2015

Radiation treatment management, 5 treatment sessions	26	$13,490	$165
Design and construction of complex radiation treatment device	27	$5,345	$57
Complex radiation therapy planning	26	$3,743	$144
Complex radiation therapy planning for delivery of external radiation	20	$3,063	$133
Obtaining data needed to develop the optimal radiation treatment, 3 or more treatment areas or any number of treatment areas where special treatment is involved	26	$1,860	$72
New patient visit (30+ min)	13	$768	$59
Obtaining data needed to develop the optimal radiation treatment, 1 treatment area	11	$416	$32

2014: 11 services

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Original Medicare services billed in 2014

Radiation treatment management, 5 treatment sessions	40	$26,621	$165
Design and construction of complex radiation treatment device	41	$10,651	$57
Complex radiation therapy planning	37	$5,856	$146
Calculation of radiation therapy dose	42	$5,428	$28
Isodose radiation therapy plan, complex	40	$4,042	$72
New patient visit (60+ min)	20	$2,994	$150
Obtaining data needed to develop the optimal radiation treatment, 3 or more treatment areas or any number of treatment areas where special treatment is involved	37	$2,959	$72
Ct guidance for insertion of radiation therapy fields	34	$1,490	$39
Initial hospital care with straightforward or low level of medical decision making, per day at least 40 minutes	12	$1,072	$89
New patient visit (30+ min)	11	$743	$68
Obtaining data needed to develop the optimal radiation treatment, 1 treatment area	21	$710	$31

2013: 10 services

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Original Medicare services billed in 2013

Radiation treatment management, 5 treatment sessions	50	$36,133	$158
Design and construction of complex radiation treatment device	51	$11,489	$54
Complex radiation therapy planning	54	$7,967	$140
Calculation of radiation therapy dose	54	$6,703	$27
New patient visit (60+ min)	44	$6,388	$145
Isodose radiation therapy plan, complex	43	$4,323	$69
Obtaining data needed to develop the optimal radiation treatment, 3 or more treatment areas or any number of treatment areas where special treatment is involved	52	$3,773	$69
Initial hospital care with moderate level of medical decision making at least 75 minutes	20	$3,515	$176
Ct guidance for insertion of radiation therapy fields	48	$1,976	$37
Obtaining data needed to develop the optimal radiation treatment, 1 treatment area	27	$920	$31

Drugs they prescribed that Part D paid

$1,614

Pharmacies billed $1,614 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 52) in 2024. At or below the middle of the specialty; the typical radiation oncology clinician is at 11%.

44 generic and fewer than 11 brand-name prescriptions · $1,614 in drug cost.

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.

Year by year

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Part D prescribing by year

2024	52	None	0% (0)	None	$1,614
2023	51	16	0% (0)	27%	$672
2022	57	15	0% (0)	None	$982
2021	105	23	None	28%	$7,599
2020	95	19	12% (11)	26%	$2,008
2019	92	28	None	28%	$1,420
2018	89	21	None	24%	$2,156
2017	165	40	None	None	$6,058
2016	180	40	7% (12)	16%	$4,855
2015	215	40	9% (20)	None	$14,905
2014	213	52	16% (35)	31%	$15,844
2013	249	58	18% (45)	19%	$15,647

Part D prescriptions only. A drug prescribed to fewer than 11 people in a year is hidden.

See the drugs prescribed each year

2023: 1 drug

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Part D drugs prescribed in 2023

Levothyroxine	12	$274	$23

2022: 1 drug

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Part D drugs prescribed in 2022

Levothyroxine	13	$327	$25

2021: 2 drugs

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Part D drugs prescribed in 2021

Levothyroxine	20	$435	$22
Dexamethasone	11	$111	$10

2020: 1 drug

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Part D drugs prescribed in 2020

Levothyroxine	19	$432	$23

2019: 1 drug

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Part D drugs prescribed in 2019

Levothyroxine	21	$538	$26

2018: 1 drug

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Part D drugs prescribed in 2018

Levothyroxine	23	$689	$30

2017: 1 drug

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Part D drugs prescribed in 2017

Levothyroxine	46	$1,171	$25

2016: 2 drugs

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Part D drugs prescribed in 2016

Levothyroxine	36	$1,220	$34
Pantoprazole	12	$64	$5

2015: 4 drugs

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Part D drugs prescribed in 2015

Tamsulosin	17	$1,333	$78
Levothyroxine	28	$871	$31
Hydrocodone-Acetaminophen	13	$237	$18
Losartan	11	$77	$7

2014: 6 drugs

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Part D drugs prescribed in 2014

Femara	12	$7,668	$639
Carafate	12	$1,585	$132
Levothyroxine	18	$474	$26
Diphenoxylate-Atropine	20	$447	$22
Dexamethasone	11	$92	$8
Prednisone	11	$60	$5

2013: 7 drugs

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Part D drugs prescribed in 2013

Femara	12	$6,664	$555
Tamsulosin	19	$627	$33
Diphenoxylate-Atropine	27	$380	$14
Levothyroxine	27	$290	$11
Hydrocodone-Acetaminophen	23	$272	$12
Hydromorphone	11	$139	$13
Losartan	11	$105	$10

Money from drug and device companies

$67 in 2025

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Industry payments by year

2025	2	2	None	$67
2024	3	3	None	$73
2023	1	1	None	$99
2019	2	5	None	$63

Paid work is consulting, speaking, honoraria and royalties, as opposed to meals and travel.

A payment is not proof that care is biased.

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Payments by company

Coherus Oncology	Loqtorzi	$37	1 payment Meals for Loqtorzi · 2025-01-22 · $37
Janssen Biotech	Rybrevant	$30	1 payment Meals for Rybrevant · 2025-03-17 · $30

See all 2 published payments

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Every published payment

Janssen Biotech	Meals · 2025-03-17	Rybrevant	$30
Coherus Oncology	Meals · 2025-01-22	Loqtorzi	$37

See earlier years (2024, 2023, 2019)

2024: $73

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Payments by company in 2024

Invivyd	Pemgarda	$31	1 payment Meals for Pemgarda · 2024-09-26 · $31
Coherus Biosciences	Loqtorzi	$28	1 payment Meals for Loqtorzi · 2024-11-05 · $28
Abbott Laboratories	Alinity	$14	1 payment Meals for Alinity · 2024-10-25 · $14

2023: $99

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Payments by company in 2023

AstraZeneca Pharmaceuticals LP	Imfinzi	$99	1 payment Education for Imfinzi · 2023-03-22 · $99

2019: $63

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Payments by company in 2019

Merck Sharp & Dohme	Keytruda	$37	2 payments Meals for Keytruda · 2019-08-09 · $19 Meals for Keytruda · 2019-03-22 · $18
Sirtex Medical	Sir-Spheres Microspheres	$26	3 payments Meals for Sir-Spheres Microspheres · 2019-08-27 · $13 Meals for Sir-Spheres Microspheres · 2019-02-21 · $5 Meals for Sir-Spheres Microspheres · 2019-01-16 · $8

Research money

Money a company paid to run a study. Where it went to their institution, the clinician is named as an investigator and did not receive it; the amount covers the whole study, often across many sites.

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Research payments by company and study

Bayer HealthCare Pharmaceuticals Inc. · Clinical Trial Pase IV (Post Marketing) (Bayer Product Or Ta) · 2020	Their institution	$1,000

Professional record

NPI: 1902897515
Licence: CA G12439California G12439: Current · expires 2027-07-31
Trained: University of Pittsburgh School of Medicine, 1964 · 62 years ago
Group: Northern California Radiation Therapists and Oncologists Medical Group
Gender: Male

More record details

Sole proprietor: No
Taxonomy: Federal specialty code 2085R0001X (2085R0001X)
Mailing address: 4301 Northstar Way, Modesto, CA, 95356
NPI first listed: 2005-11-02
NPI last updated: 2008-12-09

This is when the NPI record was last certified, not a medical board exam.