Dayani P Nualles-Percy, MD

Offices

1 location · County of Santa Clara · 1,000 clinicians in this group

Looking this up.

Hospitals listed: Santa Clara Valley Medical Center. That is not proof they admit you there this week.

Plans that list them

2 plans · 1 carrier

A missing listing does not mean out of network. Directories change, and a listing does not cover every office. Call Dr. Nualles-Percy’s office at (408) 885-5000 to confirm they take your plan. Ask about the office you use, its medical group, referrals and appointments.

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Plans whose provider directory lists this clinician

Anthem Full Dual Advantage Aligned (HMO D-SNP)	Anthem Blue Cross	Listed	Oct 3, 2026
Anthem Medicare Advantage (HMO-POS)	Anthem Blue Cross	Listed	Oct 3, 2026

California Medical Board record

Licence A135234 · Current

Licensed to practise in California · since 2015 · expires 2026-10-31 · University of California San Francisco School of Medicine.

No disciplinary actions, convictions, malpractice judgments or citations in this record.

School, training and certification

What this clinician told their state board, medical school and everything before it. Only some states publish this, so nothing here means the state does not say, not that there was no training or certification.

Specialty certification

American Board of Internal Medicine - Internal Medicine

Checkups this office reported

Medicare did not publish checkup rates for this clinician.

Medicare’s overall office score: 80.6 / 100; Scores the office’s reporting and systems. It is not a grade for how the doctor treats you.

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.

Santa Clara Valley Medical CenterSan Jose, CAAcute Care Hospital · Government - Local · Has an emergency department · Birthing-friendlyPart of Santa Clara Valley Health and Hospital System, which runs 3 hospitalsPatients rate it 3 of 5 · 70% would definitely recommend it
Overall rating: 2 of 5 starsWorse than the national rate — SSI - Colon Surgery: 2.572, Oct 2024 – Sep 2025Better than the national rate — Central Line Associated Bloodstream Infection (ICU + select Wards): 0.563, Oct 2024 – Sep 2025Better than the national rate — Clostridium Difficile (C.Diff): 0.256, Oct 2024 – Sep 2025Better than the national rate — MRSA Bacteremia: 0.369, Oct 2024 – Sep 2025

See every measure and the patient survey for Santa Clara Valley Medical Center

Behind the star rating — Deaths: 2 better, 6 the same, 0 worse of 8 measures. Safety: 2 better, 5 the same, 1 worse of 8 measures. Readmissions: 0 better, 10 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 Santa Clara Valley Medical Center

SSI - Colon SurgeryInfections	2.572	Worse	Oct 2024 – Sep 2025
Central Line Associated Bloodstream Infection (ICU + select Wards)Infections	0.563	Better	Oct 2024 – Sep 2025
Clostridium Difficile (C.Diff)Infections	0.256	Better	Oct 2024 – Sep 2025
MRSA BacteremiaInfections	0.369	Better	Oct 2024 – Sep 2025
Abdominopelvic accidental puncture or laceration rateComplications and deaths	1.25 (0.3 to 2.2) · 1,535 cases	No different	Jul 2022 – Jun 2024
CMS Medicare PSI 90: Patient safety and adverse events compositeComplications and deaths	1.07 (0.76 to 1.38)	No different	Jul 2022 – Jun 2024
Death rate among surgical inpatients with serious treatable complicationsComplications and deaths	214.59 (167.38 to 261.8) · 108 cases	No different	Jul 2022 – Jun 2024
Death rate for CABG surgery patientsComplications and deaths	2.8 · 41 cases	None	Jul 2022 – Jun 2025
Death rate for COPD patientsComplications and deaths	6 · 141 cases	None	Jul 2022 – Jun 2025
Death rate for heart attack patientsComplications and deaths	10.2 · 124 cases	None	Jul 2022 – Jun 2025
Death rate for heart failure patientsComplications and deaths	8.3 · 501 cases	None	Jul 2022 – Jun 2025
Death rate for pneumonia patientsComplications and deaths	14.9 · 653 cases	None	Jul 2022 – Jun 2025
Death rate for stroke patientsComplications and deaths	10.1 · 348 cases	None	Jul 2023 – Jun 2025
Hybrid Hospital-Wide All-Cause Risk Standardized Mortality RateComplications and deaths	3 · 4,502 cases	None	Jul 2024 – Jun 2025
Iatrogenic pneumothorax rateComplications and deaths	0.24 (0.04 to 0.43) · 9,014 cases	No different	Jul 2022 – Jun 2024
In-hospital fall-associated fracture rateComplications and deaths	0.34 (0.15 to 0.52) · 9,216 cases	No different	Jul 2022 – Jun 2024
Perioperative pulmonary embolism or deep vein thrombosis rateComplications and deaths	4.54 (2.51 to 6.58) · 1,421 cases	No different	Jul 2022 – Jun 2024
Postoperative acute kidney injury requiring dialysis rateComplications and deaths	1.54 (0 to 3.2) · 288 cases	No different	Jul 2022 – Jun 2024
Postoperative hemorrhage or hematoma rateComplications and deaths	2.11 (0.66 to 3.56) · 1,446 cases	No different	Jul 2022 – Jun 2024
Postoperative respiratory failure rateComplications and deaths	11.61 (4.09 to 19.14) · 294 cases	No different	Jul 2022 – Jun 2024
Postoperative sepsis rateComplications and deaths	7.29 (3.39 to 11.2) · 299 cases	No different	Jul 2022 – Jun 2024
Postoperative wound dehiscence rateComplications and deaths	1.9 (0.45 to 3.36) · 333 cases	No different	Jul 2022 – Jun 2024
Pressure ulcer rateComplications and deaths	0.23 (0 to 0.78) · 7,538 cases	No different	Jul 2022 – Jun 2024
Rate of complications for hip/knee replacement patientsComplications and deaths	5.4 · 94 cases	None	Apr 2023 – Mar 2025
Catheter Associated Urinary Tract Infections (ICU + select Wards)Infections	0.735	No different	Oct 2024 – Sep 2025
SSI - Abdominal HysterectomyInfections	2.573	No different	Oct 2024 – Sep 2025
Acute Myocardial Infarction (AMI) 30-Day Readmission RateUnplanned return visits	14.6 · 185 cases	None	Jul 2023 – Jun 2025
Heart failure (HF) 30-Day Readmission RateUnplanned return visits	22.1 · 951 cases	None	Jul 2023 – Jun 2025
Hospital return days for heart attack patientsUnplanned return visits	56.3 · 128 cases	None	Jul 2022 – Jun 2025
Hospital return days for heart failure patientsUnplanned return visits	6.4 · 644 cases	None	Jul 2022 – Jun 2025
Hospital return days for pneumonia patientsUnplanned return visits	1.3 · 699 cases	None	Jul 2022 – Jun 2025
Pneumonia (PN) 30-Day Readmission RateUnplanned return visits	16.3 · 921 cases	None	Jul 2023 – Jun 2025
Rate of emergency department (ED) visits for patients receiving outpatient chemotherapyUnplanned return visits	5.7 (3.9 to 8.1) · 226 cases	No different	Jan 2024 – Dec 2024
Rate of inpatient admissions for patients receiving outpatient chemotherapyUnplanned return visits	12.6 (9.4 to 16.5) · 226 cases	No different	Jan 2024 – Dec 2024
Rate of readmission after hip/knee replacementUnplanned return visits	5.4 · 94 cases	None	Jul 2023 – Jun 2025
Rate of readmission for CABGUnplanned return visits	11.4 · 54 cases	None	Jul 2023 – Jun 2025
Rate of readmission for chronic obstructive pulmonary disease (COPD) patientsUnplanned return visits	20.3 · 242 cases	None	Jul 2023 – Jun 2025
Rate of unplanned hospital visits after colonoscopy (per 1,000 colonoscopies)Unplanned return visits	13.2 (9.9 to 17.4) · 702 cases	No different	Jan 2022 – Dec 2024
Ratio of unplanned hospital visits after hospital outpatient surgeryUnplanned return visits	1 (0.7 to 1.4) · 195 cases	No different	Jan 2024 – Dec 2024

What patients said (4,032 patients answered, 29% of those asked)

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Patient survey stars by topic at Santa Clara Valley Medical Center

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

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Share of patients giving the best answer at Santa Clara Valley Medical Center

Room was "always" clean	70%
Nurses "always" communicated well	73%
Doctors "always" communicated well	76%
Staff "always" explained	57%
Yes, staff "did" give patients this information	82%
Yes, staff "did" give patients information about help after discharge	82%
Doctors "always" explained things so they could understand	71%
Doctors "always" listened carefully	74%
Doctors "always" treated them with courtesy and respect	82%
Patients who gave a rating of "9" or "10" (high)	67%
Staff "always" explained new medications	71%
Nurses "always" explained things so they could understand	71%
Nurses "always" listened carefully	69%
Nurses "always" treated them with courtesy and respect	80%
"Always" quiet at night	43%
"YES", patients would definitely recommend the hospital	70%
Staff "always" explained possible side effects	44%
Yes, staff "did" give patients information about possible symptoms	83%

Original Medicare doctor bills

$43,491

Medicare paid this office $43,491 for 131 people.

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

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Largest Original Medicare bills

Subsequent hospital care with moderate levelof medical decision making at least 35 minutes	95	$16,686	$69
Subsequent hospital care with moderate levelof medical decision making at least 50 minutes	40	$10,718	$106
Hospital discharge day management, more than 30 minutes	72	$7,652	$105
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes	57	$6,343	$108
Initial hospital care with moderate level of medical decision making at least 75 minutes	14	$1,875	$134

Who their Medicare patients are

131 Original Medicare patients in 2024. Average age 74 · Under 65 16% · 85 and older 21% · Women 41% · Also on Medicaid 83% · Health risk score 3.17. Sicker patients than 9 in 10 peers; the typical internal medicine clinician is at 1.76.

Conditions among them: High blood pressure 75% · Diabetes 56% · Chronic kidney disease 52% · Heart failure 46% · Coronary heart disease 43% · Atrial fibrillation 39% · Depression 34% · Dementia 33% · COPD 29% · Stroke 29% · Cancer 19%.

The office billed $452,553, Medicare allowed $56,315 and paid $43,491; for 492 services of 8 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	131	492	74	3.17	$452,553	$43,491
2023	125	489	72	2.87	$431,251	$44,952
2022	87	277	73	3.44	$232,593	$27,106
2021	125	417	73	3.08	$359,884	$44,365
2020	39	93	72	3.46	$81,636	$8,669
2019	147	544	70	3.38	$370,046	$47,457
2018	64	201	70	2.46	$112,096	$18,976

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: 5 services

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Original Medicare services billed in 2023

Subsequent hospital care with moderate levelof medical decision making at least 35 minutes	89	$19,959	$74
Hospital discharge day management, more than 30 minutes	68	$7,872	$109
Subsequent hospital care with moderate levelof medical decision making at least 50 minutes	33	$7,411	$111
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes	49	$5,775	$116
Initial hospital care with moderate level of medical decision making at least 75 minutes	22	$3,359	$153

2022: 5 services

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Original Medicare services billed in 2022

Subsequent hospital care with moderate levelof medical decision making at least 35 minutes	47	$10,702	$77
Hospital discharge day management, more than 30 minutes	40	$4,541	$114
Subsequent hospital care with moderate levelof medical decision making at least 50 minutes	18	$3,677	$111
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes	19	$2,713	$143
Initial hospital care with moderate level of medical decision making at least 75 minutes	11	$2,329	$212

2021: 7 services

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Original Medicare services billed in 2021

Subsequent hospital care with moderate levelof medical decision making at least 35 minutes	63	$12,925	$78
Hospital discharge day management, more than 30 minutes	62	$7,702	$118
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes	46	$7,421	$151
Subsequent hospital care with moderate levelof medical decision making at least 50 minutes	23	$6,156	$110
Initial hospital observation care per day, typically 50 minutes	22	$3,246	$148
Initial hospital care with moderate level of medical decision making at least 75 minutes	15	$3,185	$212
Hospital observation care on day of discharge	16	$1,256	$79

2020: 3 services

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Original Medicare services billed in 2020

Subsequent hospital care with moderate levelof medical decision making at least 35 minutes	19	$1,981	$71
Initial hospital care with moderate level of medical decision making at least 75 minutes	11	$1,916	$174
Hospital discharge day management, more than 30 minutes	15	$1,435	$96

2019: 7 services

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Original Medicare services billed in 2019

Subsequent hospital care with moderate levelof medical decision making at least 35 minutes	85	$13,126	$63
Subsequent hospital care with moderate levelof medical decision making at least 50 minutes	48	$12,178	$92
Initial hospital care with moderate level of medical decision making at least 75 minutes	39	$6,800	$170
Hospital discharge day management, more than 30 minutes	61	$6,058	$98
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes	30	$3,598	$120
Initial hospital observation care per day, typically 50 minutes	13	$1,578	$113
Hospital observation care on day of discharge	12	$865	$67

2018: 4 services

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Original Medicare services billed in 2018

Subsequent hospital care with moderate levelof medical decision making at least 50 minutes	23	$7,396	$94
Initial hospital care with moderate level of medical decision making at least 75 minutes	14	$2,547	$182
Subsequent hospital care with moderate levelof medical decision making at least 35 minutes	20	$2,419	$65
Hospital discharge day management, more than 30 minutes	24	$2,370	$99

Medicaid work

$7,090 in 2024

Medicaid paid $7,090 for 1,825 billed services this clinician did in 2024, up to 42 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.

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Largest Medicaid services in 2024

SBSQ HOSPITAL IP/OBS CARE MOD MDM 35 MINUTES	462	$3,551
1ST HOSPITAL IP/OBS CARE MODERATE MDM 55 MINUTES	69	$1,286
Hospital inpatient or observation discharge day management; more than 30 minutes on the date of the encounter	72	$944
PROTHROMBIN TIME	1,187	$748
SBSQ HOSPITAL IP/OBS CARE HIGH MDM 50 MINUTES	35	$562

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Medicaid work by year

2024	1,825	5	42	$7,090
2023	2,089	5	39	$6,409
2022	1,630	4	40	$8,852
2021	1,207	5	34	$10,748
2020	162	4	16	$4,635
2019	611	4	26	$10,531
2018	347	5	25	$2,685

See the largest Medicaid services in earlier years

2023

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Largest Medicaid services in 2023

SBSQ HOSPITAL IP/OBS CARE MOD MDM 35 MINUTES	508	$3,998
Hospital inpatient or observation discharge day management; more than 30 minutes on the date of the encounter	86	$867
PROTHROMBIN TIME	1,433	$736
1ST HOSPITAL IP/OBS CARE MODERATE MDM 55 MINUTES	31	$631
SBSQ HOSPITAL IP/OBS CARE HIGH MDM 50 MINUTES	31	$177

2022

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Largest Medicaid services in 2022

SBSQ HOSPITAL IP/OBS CARE MOD MDM 35 MINUTES	233	$4,163
Hospital inpatient or observation discharge day management; more than 30 minutes on the date of the encounter	72	$1,714
PROTHROMBIN TIME	1,283	$1,517
1ST HOSPITAL IP/OBS CARE MODERATE MDM 55 MINUTES	42	$1,458

2021

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Largest Medicaid services in 2021

SBSQ HOSPITAL IP/OBS CARE MOD MDM 35 MINUTES	390	$4,765
1ST HOSPITAL IP/OBS CARE MODERATE MDM 55 MINUTES	72	$2,318
Hospital inpatient or observation discharge day management; more than 30 minutes on the date of the encounter	128	$2,056
PROTHROMBIN TIME	605	$1,075
1ST HOSP IP/OBS HIGH 75	12	$534

2020

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Largest Medicaid services in 2020

SBSQ HOSPITAL IP/OBS CARE MOD MDM 35 MINUTES	77	$2,015
SBSQ HOSPITAL IP/OBS CARE HIGH MDM 50 MINUTES	44	$1,706
Hospital inpatient or observation discharge day management; more than 30 minutes on the date of the encounter	29	$637
1ST HOSPITAL IP/OBS CARE MODERATE MDM 55 MINUTES	12	$278

2019

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Largest Medicaid services in 2019

SBSQ HOSPITAL IP/OBS CARE MOD MDM 35 MINUTES	350	$5,762
Hospital inpatient or observation discharge day management; more than 30 minutes on the date of the encounter	146	$2,887
1ST HOSPITAL IP/OBS CARE MODERATE MDM 55 MINUTES	63	$1,154
SBSQ HOSPITAL IP/OBS CARE HIGH MDM 50 MINUTES	52	$728

2018

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Largest Medicaid services in 2018

SBSQ HOSPITAL IP/OBS CARE MOD MDM 35 MINUTES	170	$1,554
Hospital inpatient or observation discharge day management; more than 30 minutes on the date of the encounter	89	$660
SBSQ HOSPITAL IP/OBS CARE HIGH MDM 50 MINUTES	57	$226
1ST HOSPITAL IP/OBS CARE MODERATE MDM 55 MINUTES	12	$158
1ST HOSP IP/OBS HIGH 75	19	$87

Drugs they prescribed that Part D paid

$118,346

Pharmacies billed $118,346 in 2024.

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

1,078 generic and fewer than 11 brand-name prescriptions · $118,346 in drug cost · 24 antibiotic prescriptions to 19 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.

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Largest Part D drug costs

Eliquis	20	$74,092	$1,235
Warfarin	235	$14,843	$16
Enoxaparin	27	$3,775	$99

Year by year

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Part D prescribing by year

2024	1,214	321	None	None	$118,346
2023	1,346	348	None	None	$170,098
2022	1,579	396	None	None	$179,896
2021	1,114	416	None	None	$99,906
2020	67	21	None	21%	$2,761
2019	213	56	None	None	$17,112
2018	296	69	None	28%	$27,445
2017	213	65	None	None	$20,727

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

See the drugs prescribed each year

2023: 5 drugs

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Part D drugs prescribed in 2023

Eliquis	70	$93,378	$1,334
Warfarin	1,053	$31,975	$30
Xarelto	18	$25,928	$1,440
Enoxaparin	34	$7,372	$217
Furosemide	15	$121	$8

2022: 4 drugs

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Part D drugs prescribed in 2022

Eliquis	61	$79,933	$1,310
Xarelto	43	$55,363	$1,288
Warfarin	1,297	$30,210	$23
Enoxaparin	35	$5,273	$151

2021: 6 drugs

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Part D drugs prescribed in 2021

Eliquis	43	$42,581	$990
Xarelto	23	$23,684	$1,030
Warfarin	841	$14,468	$17
Enoxaparin	15	$2,209	$147
Atorvastatin	14	$134	$10
Pantoprazole	11	$107	$10

2019: 2 drugs

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Part D drugs prescribed in 2019

Atorvastatin	11	$116	$11
Furosemide	15	$84	$6

2018: 2 drugs

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Part D drugs prescribed in 2018

Ventolin Hfa	12	$605	$50
Furosemide	28	$161	$6

2017: 2 drugs

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Part D drugs prescribed in 2017

Pantoprazole	17	$136	$8
Furosemide	16	$110	$7

Professional record

NPI: 1679815831
Licence: CA A135234California A135234: Current · expires 2026-10-31
Trained: University of California, San Francisco School of Medicine, 2013 · 13 years ago
Group: County of Santa Clara
Gender: Female

More record details

Sole proprietor: No
Taxonomy: Internal medicine (207R00000X)
Mailing address: 751 S Bascom Ave Ste 1a012, San Jose, CA, 95128
NPI first listed: 2013-03-25
NPI last updated: 2021-12-23
NPI record certified: 2021-12-23

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