Roberto Diaz, MD | UniHealth

Offices

3 locations · Sutter Bay Medical Foundation · 3,783 clinicians in this group

Looking this up.

Hospitals listed: El Camino Health. That is not proof they admit you there this week.

Plans that list them

3 plans · 3 carriers

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

3 of 3 plans

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Plans whose provider directory lists this clinician

Alignment Health Sutter Advantage +More (HMO)	Alignment Health Plan	Listed	Oct 3, 2026
SCAN Strive (HMO C-SNP)	SCAN Health Plan	Listed	Oct 3, 2026
DualConnect (HMO D-SNP)	Santa Clara Family Health Plan	Listed	Sep 1, 2026

California Medical Board record

Licence A112035 · Current

Licensed to practise in California · since 2010 · expires 2027-09-30 · University of Iowa 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.

El Camino HealthMountain View, CAAcute Care Hospital · Government - Hospital District or Authority · Has an emergency department · Birthing-friendlyPart of El Camino Health, which runs 2 hospitalsPatients rate it 4 of 5 · 80% would definitely recommend it
Overall rating: 4 of 5 starsBetter than the national rate — Central Line Associated Bloodstream Infection (ICU + select Wards): 0.291, Oct 2024 – Sep 2025Better than the national rate — Clostridium Difficile (C.Diff): 0.393, Oct 2024 – Sep 2025Better than the national rate — MRSA Bacteremia: 0, Oct 2024 – Sep 2025

See every measure and the patient survey for El Camino Health

Behind the star rating — Deaths: 3 better, 5 the same, 0 worse of 8 measures. Safety: 3 better, 5 the same, 0 worse of 8 measures. Readmissions: 1 better, 9 the same, 1 worse of 11 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 El Camino Health

Central Line Associated Bloodstream Infection (ICU + select Wards)Infections	0.291	Better	Oct 2024 – Sep 2025
Clostridium Difficile (C.Diff)Infections	0.393	Better	Oct 2024 – Sep 2025
MRSA BacteremiaInfections	0	Better	Oct 2024 – Sep 2025
Abdominopelvic accidental puncture or laceration rateComplications and deaths	0.96 (0.12 to 1.79) · 2,340 cases	No different	Jul 2022 – Jun 2024
CMS Medicare PSI 90: Patient safety and adverse events compositeComplications and deaths	1.02 (0.76 to 1.28)	No different	Jul 2022 – Jun 2024
Death rate among surgical inpatients with serious treatable complicationsComplications and deaths	167.38 (125.03 to 209.73) · 96 cases	No different	Jul 2022 – Jun 2024
Death rate for CABG surgery patientsComplications and deaths	2.6 · 68 cases	None	Jul 2022 – Jun 2025
Death rate for COPD patientsComplications and deaths	7.1 · 185 cases	None	Jul 2022 – Jun 2025
Death rate for heart attack patientsComplications and deaths	11.8 · 200 cases	None	Jul 2022 – Jun 2025
Death rate for heart failure patientsComplications and deaths	8.9 · 814 cases	None	Jul 2022 – Jun 2025
Death rate for pneumonia patientsComplications and deaths	13 · 842 cases	None	Jul 2022 – Jun 2025
Death rate for stroke patientsComplications and deaths	9.6 · 361 cases	None	Jul 2023 – Jun 2025
Hybrid Hospital-Wide All-Cause Risk Standardized Mortality RateComplications and deaths	2.6 · 4,633 cases	None	Jul 2024 – Jun 2025
Iatrogenic pneumothorax rateComplications and deaths	0.16 (0 to 0.34) · 11,474 cases	No different	Jul 2022 – Jun 2024
In-hospital fall-associated fracture rateComplications and deaths	0.27 (0.1 to 0.45) · 11,626 cases	No different	Jul 2022 – Jun 2024
Perioperative pulmonary embolism or deep vein thrombosis rateComplications and deaths	3.14 (1.39 to 4.9) · 2,814 cases	No different	Jul 2022 – Jun 2024
Postoperative acute kidney injury requiring dialysis rateComplications and deaths	2 (0.61 to 3.39) · 1,327 cases	No different	Jul 2022 – Jun 2024
Postoperative hemorrhage or hematoma rateComplications and deaths	2.11 (0.8 to 3.43) · 2,641 cases	No different	Jul 2022 – Jun 2024
Postoperative respiratory failure rateComplications and deaths	9.39 (4.18 to 14.6) · 1,287 cases	No different	Jul 2022 – Jun 2024
Postoperative sepsis rateComplications and deaths	6.57 (3.47 to 9.68) · 1,308 cases	No different	Jul 2022 – Jun 2024
Postoperative wound dehiscence rateComplications and deaths	2.14 (0.71 to 3.57) · 827 cases	No different	Jul 2022 – Jun 2024
Pressure ulcer rateComplications and deaths	0.6 (0.05 to 1.15) · 9,460 cases	No different	Jul 2022 – Jun 2024
Rate of complications for hip/knee replacement patientsComplications and deaths	4.5 · 122 cases	None	Apr 2023 – Mar 2025
Catheter Associated Urinary Tract Infections (ICU + select Wards)Infections	0.993	No different	Oct 2024 – Sep 2025
SSI - Abdominal HysterectomyInfections	0.706	No different	Oct 2024 – Sep 2025
SSI - Colon SurgeryInfections	1.376	No different	Oct 2024 – Sep 2025
Acute Myocardial Infarction (AMI) 30-Day Readmission RateUnplanned return visits	15.5 · 218 cases	None	Jul 2023 – Jun 2025
Heart failure (HF) 30-Day Readmission RateUnplanned return visits	19.5 · 962 cases	None	Jul 2023 – Jun 2025
Hospital return days for heart attack patientsUnplanned return visits	3.8 · 200 cases	None	Jul 2022 – Jun 2025
Hospital return days for heart failure patientsUnplanned return visits	-17 · 922 cases	None	Jul 2022 – Jun 2025
Hospital return days for pneumonia patientsUnplanned return visits	18.6 · 860 cases	None	Jul 2022 – Jun 2025
Pneumonia (PN) 30-Day Readmission RateUnplanned return visits	18.7 · 827 cases	None	Jul 2023 – Jun 2025
Rate of emergency department (ED) visits for patients receiving outpatient chemotherapyUnplanned return visits	6.1 (4.5 to 8.2) · 313 cases	No different	Jan 2024 – Dec 2024
Rate of inpatient admissions for patients receiving outpatient chemotherapyUnplanned return visits	13.4 (10.6 to 16.5) · 313 cases	No different	Jan 2024 – Dec 2024
Rate of readmission after hip/knee replacementUnplanned return visits	6.1 · 144 cases	None	Jul 2023 – Jun 2025
Rate of readmission for CABGUnplanned return visits	10.3 · 80 cases	None	Jul 2023 – Jun 2025
Rate of readmission for chronic obstructive pulmonary disease (COPD) patientsUnplanned return visits	20.7 · 237 cases	None	Jul 2023 – Jun 2025
Rate of unplanned hospital visits after colonoscopy (per 1,000 colonoscopies)Unplanned return visits	12.8 (10 to 16.1) · 1,639 cases	No different	Jan 2022 – Dec 2024
Ratio of unplanned hospital visits after hospital outpatient surgeryUnplanned return visits	0.9 (0.8 to 1.1) · 1,619 cases	No different	Jan 2024 – Dec 2024

What patients said (1,535 patients answered, 22% of those asked)

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Patient survey stars by topic at El Camino Health

Cleanliness	4
Nurse communication	4
Doctor communication	4
Communication about medicines	3
Discharge information	3
Overall hospital rating	4
Quietness	2
Recommend hospital	5

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Share of patients giving the best answer at El Camino Health

Room was "always" clean	75%
Nurses "always" communicated well	79%
Doctors "always" communicated well	81%
Staff "always" explained	61%
Yes, staff "did" give patients this information	86%
Yes, staff "did" give patients information about help after discharge	86%
Doctors "always" explained things so they could understand	76%
Doctors "always" listened carefully	80%
Doctors "always" treated them with courtesy and respect	87%
Patients who gave a rating of "9" or "10" (high)	76%
Staff "always" explained new medications	76%
Nurses "always" explained things so they could understand	75%
Nurses "always" listened carefully	76%
Nurses "always" treated them with courtesy and respect	87%
"Always" quiet at night	47%
"YES", patients would definitely recommend the hospital	80%
Staff "always" explained possible side effects	46%
Yes, staff "did" give patients information about possible symptoms	86%

Original Medicare doctor bills

$156,951

Medicare paid this office $156,951 for 482 people.

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

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Largest Original Medicare bills

Return visit (30+ min)	170	$22,112	$111
New patient visit (45+ min)	147	$20,895	$142
Short return visit (20+ min)	162	$18,394	$81
New patient visit (30+ min)	106	$10,098	$95
Incision of tendon covering of finger	13	$8,797	$550

See all 15 services

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Every Original Medicare service billed

Return visit (30+ min)	170	$22,112	$111
New patient visit (45+ min)	147	$20,895	$142
Short return visit (20+ min)	162	$18,394	$81
New patient visit (30+ min)	106	$10,098	$95
Incision of tendon covering of finger	13	$8,797	$550
Release and/or relocation of hand nerve	12	$6,169	$411
Injection into tendon or ligament	75	$4,801	$49
Initial hospital care with moderate level of medical decision making at least 75 minutes	13	$2,016	$155
Aspiration and/or injection of fluid from small joint	25	$1,668	$49
Aspiration and/or injection of fluid from medium joint	28	$1,424	$49
Injection of carpal tunnel	14	$1,409	$88
Application of elbow to finger cast	14	$1,230	$88
Injection, triamcinolone acetonide, not otherwise specified, 10 mg	114	$321	None
Cast supplies, short arm cast, adult (11 years +), fiberglass	13	$242	$19
Injection, betamethasone acetate 3 mg and betamethasone sodium phosphate 3 mg	34	$221	None

Procedures Medicare counted

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Procedure volume Medicare published

Removal of nail tissue	1-10	None
Removal of tissue	1-10	None
Upper limb (arm) arthroscopy (minimally invasive joint repair)	1-10	None

Who their Medicare patients are

482 Original Medicare patients in 2024. Average age 76 · Under 65 2% · 85 and older 15% · Women 60% · Also on Medicaid 8% · Health risk score 0.87. At or below the middle of the specialty; the typical hand surgery clinician is at 1.08.

Conditions among them: High blood pressure 59% · Diabetes 22% · Coronary heart disease 20% · Chronic kidney disease 17% · Atrial fibrillation 16% · Depression 16% · Cancer 15% · Heart failure 10% · COPD 7% · Stroke 5% · Dementia 4%.

The office billed $682,737, Medicare allowed $208,598 and paid $156,951; for 1,544 services of 68 kinds; $542 of it was for drugs given in the office and $156,408 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

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Original Medicare by year

2024	482	1,544	76	0.87	$682,737	$156,951
2023	471	1,244	76	0.93	$658,050	$162,182
2022	446	1,235	76	0.95	$585,984	$149,860
2021	358	1,088	76	0.99	$587,334	$154,685
2020	309	847	75	1.01	$397,719	$95,924
2019	382	1,120	75	1.20	$520,990	$123,916
2018	353	1,098	75	1.00	$500,753	$120,152
2017	300	997	76	1.10	$399,453	$94,291
2016	209	593	75	1.10	$250,562	$62,403
2015	114	286	74	1.36	$178,927	$31,449
2014	68	84	70	1.12	$111,127	$7,272

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: 13 services

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Original Medicare services billed in 2023

Return visit (30+ min)	194	$26,953	$115
New patient visit (45+ min)	182	$26,521	$146
Incision of tendon covering of finger	19	$12,851	$612
Short return visit (20+ min)	111	$12,380	$81
Release and/or relocation of hand nerve	21	$10,239	$427
Injection into tendon or ligament	98	$6,345	$55
New patient visit (30+ min)	60	$5,805	$97
Initial hospital care with moderate level of medical decision making at least 75 minutes	14	$2,239	$160
Aspiration and/or injection of fluid from small joint	26	$1,399	$50
Injection, betamethasone acetate 3 mg and betamethasone sodium phosphate 3 mg	132	$1,086	None
Application of elbow to finger cast	11	$1,085	$90
Cast supplies, short arm cast, adult (11 years +), fiberglass	11	$218	$18
Injection, triamcinolone acetonide, not otherwise specified, 10 mg	18	$41	None

2022: 13 services

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Original Medicare services billed in 2022

New patient visit (45+ min)	183	$27,070	$148
Return visit (30+ min)	187	$26,782	$111
Short return visit (20+ min)	111	$12,775	$83
Incision of tendon covering of finger	18	$11,891	$626
Release and/or relocation of hand nerve	16	$6,855	$428
New patient visit (30+ min)	68	$6,697	$98
Injection into tendon or ligament	94	$6,180	$52
Initial hospital care with moderate level of medical decision making at least 75 minutes	11	$1,993	$181
Aspiration and/or injection of fluid from small joint	30	$1,562	$50
Application of elbow to finger cast	14	$1,222	$87
Aspiration and/or injection of fluid from medium joint	19	$1,114	$53
Injection, betamethasone acetate 3 mg and betamethasone sodium phosphate 3 mg	138	$903	None
Cast supplies, short arm cast, adult (11 years +), fiberglass	13	$218	$17

2021: 14 services

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Original Medicare services billed in 2021

New patient visit (45+ min)	164	$24,869	$152
Return visit (30+ min)	157	$24,399	$121
Short return visit (20+ min)	97	$11,682	$87
Incision of tendon covering of finger	13	$8,417	$601
Release and/or relocation of hand nerve	16	$7,188	$423
Injection into tendon or ligament	83	$4,996	$51
New patient visit (30+ min)	45	$4,064	$90
Initial hospital care with moderate level of medical decision making at least 75 minutes	20	$3,564	$178
Application of elbow to finger cast	12	$1,061	$82
Aspiration and/or injection of fluid from medium joint	14	$827	$55
Injection, betamethasone acetate 3 mg and betamethasone sodium phosphate 3 mg	111	$754	None
Aspiration and/or injection of fluid from small joint	14	$745	$50
Cast supplies, short arm cast, adult (11 years +), fiberglass	12	$196	$15
Injection, triamcinolone acetonide, not otherwise specified, 10 mg	13	$46	None

2020: 9 services

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Original Medicare services billed in 2020

Short return visit (20+ min)	125	$13,795	$71
Return visit (30+ min)	136	$12,939	$90
Incision of tendon covering of finger	18	$9,844	$547
New patient visit (30+ min)	96	$8,746	$91
Injection into tendon or ligament	60	$4,007	$48
Initial hospital care with moderate level of medical decision making at least 75 minutes	13	$2,464	$190
Aspiration and/or injection of fluid from small joint	16	$846	$45
Short return visit	11	$824	$46
Injection, betamethasone acetate 3 mg and betamethasone sodium phosphate 3 mg	86	$663	None

2019: 12 services

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Original Medicare services billed in 2019

Short return visit (20+ min)	176	$17,350	$65
Return visit (30+ min)	153	$15,989	$96
New patient visit (30+ min)	139	$12,615	$91
Incision of tendon covering of finger	18	$11,067	$553
Injection into tendon or ligament	73	$4,562	$44
Initial hospital care with moderate level of medical decision making at least 75 minutes	21	$3,870	$184
Application of elbow to finger cast	20	$1,854	$84
Aspiration and/or injection of fluid from small joint	22	$1,117	$41
Injection of carpal tunnel	12	$1,066	$71
Injection, betamethasone acetate 3 mg and betamethasone sodium phosphate 3 mg	114	$766	None
Aspiration and/or injection of fluid from medium joint	13	$632	$45
Cast supplies, short arm cast, adult (11 years +), fiberglass	20	$330	$16

2018: 10 services

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Original Medicare services billed in 2018

Return visit (30+ min)	172	$17,850	$92
Short return visit (20+ min)	149	$14,988	$65
Incision of tendon covering of finger	18	$11,514	$548
New patient visit (30+ min)	121	$10,832	$90
Release and/or relocation of hand nerve	14	$6,521	$384
Injection into tendon or ligament	76	$4,980	$44
Initial hospital care with moderate level of medical decision making at least 75 minutes	13	$2,221	$171
Aspiration and/or injection of fluid from small joint	21	$1,249	$42
Injection, betamethasone acetate 3 mg and betamethasone sodium phosphate 3 mg	102	$896	None
Aspiration and/or injection of fluid from medium joint	15	$816	$43

2017: 9 services

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Original Medicare services billed in 2017

Return visit (30+ min)	141	$14,259	$91
Short return visit (20+ min)	149	$14,139	$63
New patient visit (30+ min)	102	$9,771	$96
Injection into tendon or ligament	61	$3,921	$44
Aspiration and/or injection of fluid from medium joint	17	$990	$47
Aspiration and/or injection of fluid from small joint	16	$786	$44
Injection, betamethasone acetate 3 mg and betamethasone sodium phosphate 3 mg	91	$743	None
Injection of drug or substance under skin or into muscle	14	$362	$24
Injection, triamcinolone acetonide, not otherwise specified, 10 mg	14	$70	None

2016: 6 services

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Original Medicare services billed in 2016

Short return visit (20+ min)	111	$12,101	$64
Return visit (30+ min)	79	$7,957	$96
New patient visit (30+ min)	67	$5,939	$89
Injection into tendon or ligament	26	$1,627	$48
Aspiration and/or injection of fluid from small joint	11	$455	$38
Injection, betamethasone acetate 3 mg and betamethasone sodium phosphate 3 mg	34	$205	None

2015: 4 services

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Original Medicare services billed in 2015

Short return visit (20+ min)	50	$5,433	$71
New patient visit (30+ min)	33	$3,267	$99
Injection into tendon or ligament	20	$1,584	$57
Injection, betamethasone acetate 3 mg and betamethasone sodium phosphate 3 mg	25	$162	None

2014: 3 services

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Original Medicare services billed in 2014

Prosthetic repair of shoulder joint, total shoulder	12	$2,524	$210
Short return visit (20+ min)	33	$1,594	$46
New patient visit (30+ min)	11	$743	$68

Drugs they prescribed that Part D paid

$382

Pharmacies billed $382 in 2024.

This is pharmacy cost, not the office bill, and not what patients paid.

Opioids were 58% of their Part D prescriptions (46 of 80) in 2024. Above the middle of the specialty; the typical hand surgery clinician is at 47%.

80 generic and 0 brand-name prescriptions · $382 in drug cost · 12 antibiotic prescriptions.

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.

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Largest Part D drug costs

Hydrocodone-Acetaminophen	33	$175	$5
Ibuprofen	15	$21	$1

Year by year

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Part D prescribing by year

2024	80	51	58% (46)	0%	$382
2023	100	64	56% (56)	None	$487
2022	73	50	47% (34)	0%	$400
2021	100	65	48% (48)	None	$696
2020	80	53	56% (45)	0%	$564
2019	90	62	48% (43)	None	$1,244
2018	168	107	41% (68)	10%	$2,174
2017	66	43	55% (36)	None	$679
2016	66	43	44% (29)	None	$601
2015	42	30	60% (25)	None	$536
2014	38	29	71% (27)	None	$663
2013	35	23	66% (23)	None	$760

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

See the drugs prescribed each year

2023: 2 drugs

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Part D drugs prescribed in 2023

Hydrocodone-Acetaminophen	47	$186	$4
Ibuprofen	22	$59	$3

2022: 2 drugs

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Part D drugs prescribed in 2022

Hydrocodone-Acetaminophen	26	$107	$4
Ibuprofen	20	$48	$2

2021: 2 drugs

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Part D drugs prescribed in 2021

Hydrocodone-Acetaminophen	40	$180	$5
Ibuprofen	14	$32	$2

2020: 3 drugs

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Part D drugs prescribed in 2020

Hydrocodone-Acetaminophen	22	$115	$5
Acetaminophen-Codeine	21	$75	$4
Cephalexin	11	$35	$3

2019: 3 drugs

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Part D drugs prescribed in 2019

Diclofenac	11	$337	$31
Hydrocodone-Acetaminophen	28	$155	$6
Gabapentin	11	$99	$9

2018: 6 drugs

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Part D drugs prescribed in 2018

Diclofenac	18	$622	$35
Hydrocodone-Acetaminophen	30	$155	$5
Oxycodone	16	$112	$7
Cephalexin	13	$94	$7
Ibuprofen	11	$38	$3
Acetaminophen-Codeine	16	$36	$2

2017: 1 drug

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Part D drugs prescribed in 2017

Hydrocodone-Acetaminophen	16	$84	$5

2016: 2 drugs

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Part D drugs prescribed in 2016

Hydrocodone-Acetaminophen	14	$176	$13
Gabapentin	15	$78	$5

2014: 1 drug

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Part D drugs prescribed in 2014

Oxycodone	11	$137	$12

Money from drug and device companies

$230 in 2025

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Industry payments by year

2025	2	3	None	$230
2024	2	3	None	$221
2020	1	1	None	$32
2019	1	2	None	$49

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

Axogen	None	$204	2 payments Meals · 2025-12-03 · $149 Meals · 2025-09-29 · $55
Endo USA	Xiaflex	$26	1 payment Meals for Xiaflex · 2025-07-11 · $26

See all 3 published payments

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Every published payment

Axogen	Meals · 2025-12-03	None	$149
Axogen	Meals · 2025-09-29	None	$55
Endo USA	Meals · 2025-07-11	Xiaflex	$26

See earlier years (2024, 2020, 2019)

2024: $221

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Payments by company in 2024

Globus Medical	Excelsius Deformity	$174	2 payments Travel for Excelsiusgps Robotic Navigation System · 2024-05-21 · $66 Meals for Excelsius Deformity · 2024-05-20 · $108
Axogen	Avance Nerve Graft	$47	1 payment Meals for Avance Nerve Graft · 2024-07-22 · $47

2020: $32

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Payments by company in 2020

Axogen	Avance Nerve Graft	$32	1 payment Meals for Avance Nerve Graft · 2020-10-09 · $32

2019: $49

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Payments by company in 2019

Axogen	Axoguard Nerve Connector	$49	2 payments Meals for Axoguard Nerve Connector · 2019-06-18 · $15 Meals for Axoguard Nerve Connector · 2019-03-08 · $34

Professional record

NPI: 1124261110
Licence: CA A112035California A112035: Current · expires 2027-09-30
Trained: University of Iowa, Rj & L Carver College of Medicine, 2008
Group: Sutter Bay Medical Foundation
Gender: Male

More record details

Sole proprietor: No
Taxonomy: Federal specialty code 207XS0106X (207XS0106X)
Mailing address: 325 Distel Cir, Los Altos, CA, 94022
NPI first listed: 2009-04-07
NPI last updated: 2020-12-10
NPI record certified: 2020-12-10

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