Johnathan Ly, MD | UniHealth

Offices

2 locations · Emergency Physicians Associates Fremont PC · Emergency Physicians Associates San Jose PC

Looking this up.

Hospitals listed: Santa Clara Valley Medical Center. 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. Ly’s office to ask if they take your plan before you enroll.

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

$76,503

Medicare paid this office $76,503 for 481 people.

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

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Largest Original Medicare bills

Emergency department visit with high level of medical decision making	269	$37,735	$135
Critical care, first 30-74 minutes	139	$24,921	$176
Emergency department visit with moderate level of medical decision making	74	$7,085	$92
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only	209	$1,532	$7
X-ray of chest, 1 view	37	$255	$7

See all 6 services

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Every Original Medicare service billed

Emergency department visit with high level of medical decision making	269	$37,735	$135
Critical care, first 30-74 minutes	139	$24,921	$176
Emergency department visit with moderate level of medical decision making	74	$7,085	$92
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only	209	$1,532	$7
X-ray of chest, 1 view	37	$255	$7
X-ray of chest, 2 views	14	$113	$8

Who their Medicare patients are

481 Original Medicare patients in 2024. Average age 73 · Under 65 18% · 85 and older 22% · Women 58% · Also on Medicaid 68% · Health risk score 2.65. Above the middle of the specialty; the typical emergency medicine clinician is at 2.01.

Conditions among them: High blood pressure 75% · Diabetes 50% · Chronic kidney disease 41% · Coronary heart disease 40% · Heart failure 37% · Atrial fibrillation 31% · Depression 30% · COPD 27% · Dementia 25% · Stroke 17% · Cancer 10%.

The office billed $655,090, Medicare allowed $103,644 and paid $76,503; for 852 services of 46 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	481	852	73	2.65	$655,090	$76,503
2023	483	962	72	2.35	$526,933	$79,589
2022	459	835	72	2.47	$347,199	$79,704
2021	361	668	71	2.41	$276,223	$68,009
2020	348	551	76	2.60	$259,776	$59,418
2019	402	488	72	2.45	$451,646	$51,991
2018	382	435	73	2.07	$550,400	$53,118

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: 6 services

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Original Medicare services billed in 2023

Emergency department visit with high level of medical decision making	258	$36,937	$140
Critical care, first 30-74 minutes	162	$29,497	$179
Emergency department visit with moderate level of medical decision making	60	$6,111	$94
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only	287	$2,193	$7
X-ray of chest, 1 view	62	$479	$8
X-ray of knee, 1-2 views	12	$81	$7

2022: 6 services

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Original Medicare services billed in 2022

Emergency department visit with high level of medical decision making	207	$34,197	$161
Critical care, first 30-74 minutes	120	$27,237	$218
Emergency department visit with moderate level of medical decision making	79	$8,329	$103
Emergency department visit with low level of medical decision making	60	$4,346	$59
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only	202	$1,561	$7
X-ray of chest, 1 view	41	$325	$8

2021: 5 services

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Original Medicare services billed in 2021

Emergency department visit with high level of medical decision making	178	$31,873	$175
Critical care, first 30-74 minutes	81	$20,202	$243
Emergency department visit with moderate level of medical decision making	62	$6,834	$107
Emergency department visit with low level of medical decision making	47	$3,256	$59
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only	193	$1,584	$7

2020: 6 services

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Original Medicare services billed in 2020

Emergency department visit with high level of medical decision making	168	$26,893	$159
Critical care, first 30-74 minutes	78	$17,955	$227
Emergency department visit with moderate level of medical decision making	45	$4,347	$92
Emergency department visit with low level of medical decision making	53	$2,620	$49
Critical care, each additional 30 minutes	12	$2,469	$99
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only	119	$1,010	$8

2019: 5 services

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Original Medicare services billed in 2019

Emergency department visit with high level of medical decision making	220	$31,597	$141
Critical care, first 30-74 minutes	35	$6,626	$189
Emergency department visit with moderate level of medical decision making	65	$6,174	$95
Emergency department visit with low level of medical decision making	64	$3,214	$50
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only	48	$339	$7

2018: 5 services

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Original Medicare services billed in 2018

Emergency department visit with high level of medical decision making	226	$33,688	$145
Emergency department visit with moderate level of medical decision making	65	$6,323	$97
Critical care, first 30-74 minutes	27	$5,093	$189
Initial hospital observation care per day, typically 70 minutes	25	$3,886	$155
Emergency department visit with low level of medical decision making	38	$2,012	$52

Medicaid work

$110,412 in 2024

Medicaid paid $110,412 for 3,659 billed services this clinician did in 2024, up to 138 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

EMERGENCY DEPARTMENT VISIT HIGH MDM	1,012	$48,787
EMERGENCY DEPT VISIT MOD MDM	1,131	$37,551
Critical care, evaluation and management of the critically ill or critically injured patient; first 30-74 minutes	193	$11,058
Service	203	$7,425
Electrocardiogram, routine ECG with at least 12 leads; interpretation and report only	564	$2,210
EMERGENCY DEPT VISIT LOW MDM	95	$1,814
Blood count; complete (CBC), automated (Hgb, Hct, RBC, WBC and platelet count) and automated differential WBC count	76	$606
ELECTROLYTE PANEL	47	$313
ASSAY OF LIPASE	15	$117
Return visit (30+ min)	12	$98
Measurement of magnesium	13	$91
Urinalysis, by dip stick or tablet reagent for bilirubin, glucose, hemoglobin, ketones, leukocytes, nitrite, pH, protein, specific gravity, urobilinogen, any number of these constituents; automated, with microscopy	23	$82

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Medicaid work by year

2024	3,659	17	138	$110,412
2023	6,752	22	142	$163,688
2022	2,555	10	157	$74,035
2021	2,009	6	88	$68,523
2020	1,422	7	83	$46,782
2019	455	5	33	$22,027
2018	16	1	16	$1,119

See the largest Medicaid services in earlier years

2023

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Largest Medicaid services in 2023

EMERGENCY DEPARTMENT VISIT HIGH MDM	1,265	$61,068
EMERGENCY DEPT VISIT MOD MDM	1,515	$53,589
Service	483	$17,779
Critical care, evaluation and management of the critically ill or critically injured patient; first 30-74 minutes	281	$14,034
New patient visit (45+ min)	65	$2,981
Electrocardiogram, routine ECG with at least 12 leads; interpretation and report only	651	$2,954
Blood count; complete (CBC), automated (Hgb, Hct, RBC, WBC and platelet count) and automated differential WBC count	298	$2,339
ELECTROLYTE PANEL	270	$1,891
Electrocardiogram, routine ECG with at least 12 leads; tracing only, without interpretation and report	80	$1,380
Service	38	$1,296
EMERGENCY DEPT VISIT LOW MDM	64	$1,186
Service	549	$702

2022

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Largest Medicaid services in 2022

EMERGENCY DEPT VISIT LOW MDM	1,096	$25,301
EMERGENCY DEPARTMENT VISIT HIGH MDM	451	$19,706
EMERGENCY DEPT VISIT MOD MDM	489	$16,853
Service	198	$7,584
Critical care, evaluation and management of the critically ill or critically injured patient; first 30-74 minutes	54	$2,613
Electrocardiogram, routine ECG with at least 12 leads; interpretation and report only	125	$1,284
COMPREHENSIVE METABOLIC PANEL	24	$260
Blood count; complete (CBC), automated (Hgb, Hct, RBC, WBC and platelet count) and automated differential WBC count	26	$209
Service	78	$153
Smoking and tobacco use cessation counseling visit; intermediate, greater than 3 minutes up to 10 minutes	14	$72

2021

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Largest Medicaid services in 2021

EMERGENCY DEPARTMENT VISIT HIGH MDM	524	$28,565
EMERGENCY DEPT VISIT LOW MDM	788	$19,073
EMERGENCY DEPT VISIT MOD MDM	459	$16,302
Service	49	$1,835
Electrocardiogram, routine ECG with at least 12 leads; interpretation and report only	173	$1,705
Critical care, evaluation and management of the critically ill or critically injured patient; first 30-74 minutes	16	$1,042

2020

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Largest Medicaid services in 2020

EMERGENCY DEPARTMENT VISIT HIGH MDM	301	$16,254
EMERGENCY DEPT VISIT LOW MDM	592	$14,892
EMERGENCY DEPT VISIT MOD MDM	172	$6,335
Service	61	$5,920
Service	53	$1,978
Electrocardiogram, routine ECG with at least 12 leads; interpretation and report only	194	$1,277
Service	49	$126

2019

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Largest Medicaid services in 2019

EMERGENCY DEPARTMENT VISIT HIGH MDM	167	$7,897
Service	53	$7,072
EMERGENCY DEPT VISIT LOW MDM	147	$4,338
EMERGENCY DEPT VISIT MOD MDM	76	$2,685
Blood count; complete (CBC), automated (Hgb, Hct, RBC, WBC and platelet count) and automated differential WBC count	12	$35

2018

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Largest Medicaid services in 2018

EMERGENCY DEPARTMENT VISIT HIGH MDM	16	$1,119

Drugs they prescribed that Part D paid

$4,845

Pharmacies billed $4,845 in 2024.

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

294 generic and 34 brand-name prescriptions · $4,845 in drug cost · 110 antibiotic prescriptions to 102 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

Albuterol Sulfate Hfa	15	$398	$27
Ibuprofen	87	$256	$3
Amoxicillin-Clavulanate Potass	18	$230	$12
Nitrofurantoin Mono-Macro	26	$209	$8
Cefdinir	11	$191	$17

See all 11 drugs

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Every Part D drug this clinician prescribed

Albuterol Sulfate Hfa	15	$398	$27
Ibuprofen	87	$256	$3
Amoxicillin-Clavulanate Potass	18	$230	$12
Nitrofurantoin Mono-Macro	26	$209	$8
Cefdinir	11	$191	$17
Clindamycin	13	$157	$12
Levofloxacin	13	$58	$4
Prochlorperazine Maleate	12	$49	$4
Cyclobenzaprine	16	$40	$3
Ondansetron	13	$39	$3
Famotidine	12	$31	$3

Year by year

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Part D prescribing by year

2024	328	220	None	10%	$4,845
2023	365	245	None	None	$5,853
2022	292	204	None	None	$4,230
2021	203	129	8% (17)	7%	$3,038
2020	155	104	8% (13)	None	$1,477
2019	194	145	None	12%	$2,024
2018	160	109	None	7%	$2,278
2017	61	52	None	None	$523
2016	60	47	None	None	$698
2015	13	11	0% (0)	0%	$106

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

See the drugs prescribed each year

2023: 11 drugs

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Part D drugs prescribed in 2023

Cefpodoxime Proxetil	12	$992	$83
Albuterol Sulfate Hfa	16	$626	$39
Levofloxacin	23	$467	$20
Ibuprofen	97	$413	$4
Nitrofurantoin Mono-Macro	28	$346	$12
Clindamycin	12	$106	$9
Azithromycin	12	$79	$7
Ondansetron	17	$76	$4
Prochlorperazine Maleate	17	$71	$4
Famotidine	11	$69	$6
Cyclobenzaprine	18	$57	$3

2022: 7 drugs

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Part D drugs prescribed in 2022

Albuterol Sulfate Hfa	12	$499	$42
Nitrofurantoin Mono-Macro	27	$498	$18
Ibuprofen	69	$328	$5
Clindamycin	15	$218	$15
Levofloxacin	15	$172	$11
Cyclobenzaprine	26	$144	$6
Ondansetron	11	$65	$6

2021: 6 drugs

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Part D drugs prescribed in 2021

Nitrofurantoin Mono-Macro	18	$309	$17
Ibuprofen	46	$190	$4
Clindamycin	11	$131	$12
Levofloxacin	11	$115	$10
Cyclobenzaprine	13	$68	$5
Oxycodone-Acetaminophen	17	$45	$3

2020: 5 drugs

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Part D drugs prescribed in 2020

Clindamycin	12	$157	$13
Ibuprofen	41	$141	$3
Levofloxacin	11	$105	$10
Cyclobenzaprine	14	$93	$7
Oxycodone-Acetaminophen	13	$36	$3

2019: 4 drugs

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Part D drugs prescribed in 2019

Nitrofurantoin Mono-Macro	17	$381	$22
Levofloxacin	23	$241	$10
Ibuprofen	39	$131	$3
Metronidazole	11	$88	$8

2018: 2 drugs

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Part D drugs prescribed in 2018

Ibuprofen	39	$141	$4
Levofloxacin	14	$73	$5

Professional record

NPI: 1396123717
Licence: NY 292237
Trained: New York Medical College, 2015
Group: Emergency Physicians Associates Fremont PC · Emergency Physicians Associates San Jose PC
Gender: Male

More record details

Sole proprietor: Yes
Taxonomy: Federal specialty code 207P00000X (207P00000X)
Mailing address: 50 Saratoga Ave, Santa Clara, CA, 95051
NPI first listed: 2015-05-18
NPI last updated: 2019-08-29

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