A missing listing does not mean out of network. Directories change, and a listing does not cover every office. Call Dr. Chao’s office at (650) 962-0242 to confirm they take your plan. Ask about the office you use, its medical group, referrals and appointments.
10 of 10 plans
Plans whose provider directory lists this clinician
Licensed to practise in California · since 2011 · expires 2027-04-30 · Oregon Health Sciences University School of Medicine.
No disciplinary actions, convictions, malpractice judgments or citations in this record.
Original Medicare doctor bills
$155,507
Medicare paid this office $155,507 for 210 people.
This is what Medicare paid the clinician — not Medicare Advantage, and not the pharmacy.
Largest Original Medicare bills
Ultrasound of both sides of head and neck blood flow
192
$48,653
$204
Ultrasound of heart with color-depicted blood flow, rate, direction and valve function
193
$40,952
$168
Return visit (30+ min)
198
$36,764
$116
Ultrasound of heart with continuous electrocardiogram (ecg) during rest, exercise and/or drug induced stress with review and report
79
$19,934
$240
New patient visit (45+ min)
40
$5,931
$148
See all 6 services
Every Original Medicare service billed
Ultrasound of both sides of head and neck blood flow
192
$48,653
$204
Ultrasound of heart with color-depicted blood flow, rate, direction and valve function
193
$40,952
$168
Return visit (30+ min)
198
$36,764
$116
Ultrasound of heart with continuous electrocardiogram (ecg) during rest, exercise and/or drug induced stress with review and report
79
$19,934
$240
New patient visit (45+ min)
40
$5,931
$148
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report
194
$2,904
$12
Who their Medicare patients are
210 Original Medicare patients in 2024. Average age 75 · Under 65 0% · 85 and older 8% · Women 42% · Also on Medicaid 9% · Health risk score 0.73. At or below the middle of the specialty; the typical cardiology clinician is at 1.71.
The office billed $305,905, Medicare allowed $200,053 and paid $155,507; for 1,188 services of 10 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
Original Medicare by year
2024
210
1,188
75
0.73
$305,905
$155,507
2023
363
984
77
1.56
$426,915
$100,544
2022
755
2,347
77
1.64
$1,335,187
$237,811
2021
568
1,820
77
1.76
$859,071
$184,300
2020
429
1,441
76
1.89
$670,157
$135,023
2019
196
645
76
1.65
$322,813
$65,559
2018
29
42
76
2.72
$7,770
$1,385
2017
17
25
76
1.43
$4,519
$1,099
2016
313
390
70
2.99
$20,910
$2,718
2015
458
553
70
2.82
$27,880
$4,327
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: 12 services
Original Medicare services billed in 2023
Ultrasound of both sides of head and neck blood flow
105
$23,164
$205
Ultrasound of heart with color-depicted blood flow, rate, direction and valve function
125
$19,934
$150
Return visit (30+ min)
110
$16,944
$120
Long return visit (40+ min)
158
$16,340
$93
Ultrasound of heart with continuous electrocardiogram (ecg) during rest, exercise and/or drug induced stress with review and report
25
$6,058
$242
Subsequent hospital care with moderate levelof medical decision making at least 50 minutes
28
$5,353
$97
New patient visit (45+ min)
18
$1,734
$96
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report
116
$1,556
$12
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes
14
$1,414
$101
Ultrasound of heart with color-depicted blood flow, rate, direction and valve function
29
$1,256
$43
Telehealth originating site facility fee
33
$665
$19
Heart rhythm review and interpretation of continous external ekg over 8-15 days
14
$185
$13
2022: 22 services
Original Medicare services billed in 2022
Long return visit (40+ min)
295
$84,405
$155
Subsequent hospital care with moderate levelof medical decision making at least 50 minutes
137
$32,049
$89
New patient visit (45+ min)
179
$25,872
$145
Critical care, first 30-74 minutes
44
$23,703
$187
Ultrasound of heart with color-depicted blood flow, rate, direction and valve function
152
$19,191
$125
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes
82
$10,116
$111
Ultrasound of heart with color-depicted blood flow, rate, direction and valve function
166
$9,911
$58
New patient visit (60+ min)
19
$3,896
$205
Insertion of tube in left lower heart chamber and coronary artery for diagnosis with review by radiologist
13
$2,744
$211
Telephone medical discussion with physician, 5-10 minutes
44
$2,047
$44
Ultrasound of heart
50
$1,964
$39
Heart rhythm review and interpretation of continous external ekg over 8-15 days
77
$1,728
$22
Initial hospital observation care per day, typically 50 minutes
17
$1,640
$96
Telehealth originating site facility fee
54
$1,211
$22
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report
63
$891
$13
Ultrasound of heart, follow-up
34
$783
$21
Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician
44
$540
$12
Heart rhythm recording of continous external ekg over 8-15 days
40
$515
$13
Exercise or drug-induced heart stress test with electrocardiogram (ecg) with supervision by physician
22
$422
$19
Ultrasound of heart blood flow, valves and chambers, follow-up
29
$190
$6
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only
20
$145
$7
Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito
15
$74
$5
2021: 20 services
Original Medicare services billed in 2021
Subsequent hospital care with moderate levelof medical decision making at least 50 minutes
132
$40,654
$93
Ultrasound of heart with color-depicted blood flow, rate, direction and valve function
136
$28,978
$208
Return visit (30+ min)
160
$27,191
$113
New patient visit (45+ min)
114
$17,723
$155
Long return visit (40+ min)
62
$12,511
$174
Ultrasound of heart with color-depicted blood flow, rate, direction and valve function
183
$11,580
$61
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes
78
$10,520
$120
Critical care, first 30-74 minutes
28
$8,846
$192
Telephone medical discussion with physician, 5-10 minutes
55
$3,519
$53
Initial hospital observation care per day, typically 50 minutes
25
$3,158
$121
Insertion of tube in left lower heart chamber and coronary artery for diagnosis with review by radiologist
11
$2,225
$202
Follow-up observation care per day, typically 35 minutes
19
$1,992
$95
Heart rhythm review and interpretation of continous external ekg over 8-15 days
58
$1,397
$24
New patient visit (30+ min)
11
$946
$86
Telephone medical discussion with physician, 11-20 minutes
13
$776
$60
Heart rhythm recording of continous external ekg over 8-15 days
55
$771
$14
Ultrasound of heart, follow-up
22
$673
$23
Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician
39
$483
$12
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report
30
$431
$14
Ultrasound of heart blood flow, valves and chambers, follow-up
16
$132
$7
2020: 25 services
Original Medicare services billed in 2020
Subsequent hospital care with moderate levelof medical decision making at least 50 minutes
133
$33,660
$94
Critical care, first 30-74 minutes
25
$14,938
$197
Ultrasound of heart with color-depicted blood flow, rate, direction and valve function
71
$14,562
$202
Return visit (30+ min)
89
$10,922
$88
Ultrasound of heart with color-depicted blood flow, rate, direction and valve function
149
$9,788
$65
Initial hospital care with moderate level of medical decision making at least 75 minutes
46
$8,979
$183
New patient visit (45+ min)
38
$4,937
$130
Telephone medical discussion with physician, 11-20 minutes
52
$4,207
$69
Insertion of tube in left lower heart chamber and coronary artery for diagnosis with review by radiologist
15
$3,771
$251
Initial hospital care with straightforward or low level of medical decision making, per day at least 40 minutes
37
$3,502
$92
New patient visit (30+ min)
24
$2,382
$99
Initial hospital care with straightforward or low-level medical decision making at least 55 minutes
13
$1,836
$131
Follow-up observation care per day, typically 35 minutes
15
$1,779
$99
External ekg recording for more than 48 hours up to 21 days with analysis, report, review and interpretation
23
$1,534
$67
Short return visit (20+ min)
20
$1,368
$68
Telephone medical discussion with physician, 5-10 minutes
30
$1,336
$43
Initial hospital observation care per day, typically 30 minutes
13
$1,170
$90
Short return visit
21
$974
$44
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report
44
$736
$16
External ekg recording for more than 48 hours up to 21 days
20
$552
$28
Ultrasound of heart, follow-up
19
$540
$23
Review and interpretation of external ekg recording for more than 48 hours up to 21 days
21
$512
$24
Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician
33
$435
$13
Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes
14
$155
$11
Ultrasound of heart blood flow, valves and chambers, follow-up
14
$120
$7
2019: 11 services
Original Medicare services billed in 2019
Subsequent hospital care with moderate levelof medical decision making at least 50 minutes
45
$12,567
$93
New patient visit (45+ min)
61
$9,047
$148
Critical care, first 30-74 minutes
14
$8,806
$196
Ultrasound of heart with color-depicted blood flow, rate, direction and valve function
31
$6,471
$209
Return visit (30+ min)
45
$6,363
$99
Initial hospital care with moderate level of medical decision making at least 75 minutes
29
$5,615
$181
Ultrasound of heart with color-depicted blood flow, rate, direction and valve function
64
$4,208
$66
Long return visit (40+ min)
28
$4,086
$136
External ekg recording for more than 48 hours up to 21 days with analysis, report, review and interpretation
23
$2,078
$90
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report
65
$1,184
$16
Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician
20
$270
$14
2018: 1 service
Original Medicare services billed in 2018
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only
17
$118
$6
2016: 2 services
Original Medicare services billed in 2016
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only
258
$2,013
$6
Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician
57
$683
$12
2015: 2 services
Original Medicare services billed in 2015
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only
400
$3,535
$7
Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician
64
$792
$12
Medicaid work
$1,500 in 2023
Medicaid paid $1,500 for 45 billed services this clinician did in 2023, up to 21 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.
Largest Medicaid services in 2023
Echocardiography, transthoracic, real-time with image documentation (2D), includes M-mode recording, when performed, complete, with spectral Doppler echocardiography, and with color flow Doppler echocardiography
33
$1,058
Long return visit (40+ min)
12
$442
Medicaid work by year
2023
45
2
21
$1,500
2022
43
2
17
$1,485
2021
16
1
16
$356
2018
29
1
15
$0
See the largest Medicaid services in earlier years
2022
Largest Medicaid services in 2022
Echocardiography, transthoracic, real-time with image documentation (2D), includes M-mode recording, when performed, complete, with spectral Doppler echocardiography, and with color flow Doppler echocardiography
31
$1,276
Electrocardiogram, routine ECG with at least 12 leads; with interpretation and report
12
$209
2021
Largest Medicaid services in 2021
Echocardiography, transthoracic, real-time with image documentation (2D), includes M-mode recording, when performed, complete, with spectral Doppler echocardiography, and with color flow Doppler echocardiography
16
$356
2018
Largest Medicaid services in 2018
Electrocardiogram, routine ECG with at least 12 leads; interpretation and report only
29
$0
Money from drug and device companies
$1,088 in 2025
Industry payments by year
2025
9
24
—None
$1,088
2024
8
47
—None
$1,673
2023
7
18
—None
$638
2022
3
7
—None
$135
2021
5
10
—None
$417
2020
2
3
—None
$44
2019
1
1
—None
$16
Paid work is consulting, speaking, honoraria and royalties, as opposed to meals and travel.
See earlier years (2024, 2023, 2022, 2021, 2020, 2019)
2024: $1,673
Payments by company in 2024
Amgen
Repatha
$455
17 payments
Meals for Repatha · 2024-11-20 · $12
Meals for Repatha · 2024-10-18 · $11
Meals for Repatha · 2024-09-24 · $12
Meals for Repatha · 2024-09-13 · $27
Meals for Repatha · 2024-08-14 · $11
Meals for Repatha · 2024-07-15 · $10
Meals for Repatha · 2024-06-17 · $11
Meals for Repatha · 2024-06-03 · $28
Meals for Repatha · 2024-05-23 · $107
Meals for Repatha · 2024-05-14 · $9
Meals for Repatha · 2024-04-23 · $27
Meals for Repatha · 2024-04-01 · $12
Meals for Repatha · 2024-03-20 · $10
Meals for Repatha · 2024-02-28 · $11
Meals for Repatha · 2024-02-07 · $22
Meals for Repatha · 2024-02-01 · $125
Meals for Repatha · 2024-01-11 · $10
Novo Nordisk
Wegovy
$294
6 payments
Meals for Ozempic · 2024-10-22 · $12
Meals for Wegovy · 2024-09-25 · $122
Meals for Ozempic · 2024-07-02 · $9
Meals for Ozempic · 2024-06-14 · $14
Meals for Wegovy · 2024-06-13 · $122
Meals for Rybelsus · 2024-03-06 · $15
Merck Sharp & Dohme
Verquvo
$260
6 payments
Meals for Verquvo · 2024-11-11 · $26
Meals for Verquvo · 2024-10-02 · $27
Meals for Verquvo · 2024-07-18 · $28
Meals for Verquvo · 2024-06-11 · $28
Meals for Verquvo · 2024-04-04 · $27
Meals for Verquvo · 2024-03-13 · $124
Novartis Pharmaceuticals
Leqvio
$249
8 payments
Meals for Entresto · 2024-11-22 · $31
Meals for Entresto · 2024-10-07 · $32
Meals for Leqvio · 2024-06-20 · $29
Meals for Leqvio · 2024-05-13 · $35
Meals for Leqvio · 2024-04-16 · $31
Meals for Entresto · 2024-03-05 · $23
Meals for Leqvio · 2024-02-27 · $35
Meals for Leqvio · 2024-01-18 · $34
Kiniksa Pharmaceuticals International plc
Arcalyst
$236
5 payments
Meals for Arcalyst · 2024-08-20 · $30
Meals for Arcalyst · 2024-05-22 · $26
Meals for Arcalyst · 2024-04-17 · $124
Meals for Arcalyst · 2024-03-27 · $26
Meals for Arcalyst · 2024-01-10 · $31
Motiva USA
Motiva Implant Matrix
$96
2 payments
Meals for Motiva Implant Matrix · 2024-11-21 · $38
Meals for Motiva Implant Matrix · 2024-10-23 · $58
iRhythm Technologies
Zio Xt Patch
$58
2 payments
Meals for Zio Xt Patch · 2024-03-19 · $26
Meals for Zio Xt Patch · 2024-01-25 · $32
Azurity Pharmaceuticals
Edarbi
$25
1 payment
Meals for Edarbi · 2024-07-24 · $25
2023: $638
Payments by company in 2023
Janssen Pharmaceuticals
Xarelto
$158
4 payments
Meals for Xarelto · 2023-06-27 · $96
Meals for Xarelto · 2023-06-27 · $23
Meals for Xarelto · 2023-06-27 · $11
Meals for Xarelto · 2023-05-02 · $28
Novartis Pharmaceuticals
Leqvio
$149
5 payments
Meals for Leqvio · 2023-10-20 · $22
Meals for Leqvio · 2023-10-10 · $30
Meals for Leqvio · 2023-08-08 · $32
Meals for Leqvio · 2023-06-29 · $33
Meals for Leqvio · 2023-05-24 · $32
Paratek Pharmaceuticals
Nuzyra
$119
1 payment
Meals for Nuzyra · 2023-07-27 · $119
Merck Sharp & Dohme
Verquvo
$110
4 payments
Meals for Verquvo · 2023-10-18 · $29
Meals for Verquvo · 2023-08-29 · $29
Meals for Verquvo · 2023-07-11 · $25
Meals for Verquvo · 2023-04-06 · $28
Amgen
Repatha
$51
2 payments
Meals for Repatha · 2023-07-20 · $24
Meals for Repatha · 2023-03-09 · $26
Integra LifeSciences
Durasorb Monofilament Mesh
$27
1 payment
Meals for Durasorb Monofilament Mesh · 2023-05-24 · $27
Abbott Laboratories
Mitraclip
$24
1 payment
Meals for Mitraclip · 2023-07-27 · $24
2022: $135
Payments by company in 2022
Novartis Pharmaceuticals
Leqvio
$61
4 payments
Meals for Leqvio · 2022-11-23 · $16
Meals for Entresto · 2022-10-19 · $17
Meals for Leqvio · 2022-09-21 · $16
Meals for Leqvio · 2022-05-24 · $12
Sientra
Sientra High Strength Cohesive Silicone Gel Breast Implant
$51
2 payments
Meals for Sientra High Strength Cohesive Silicone Gel Breast Implant · 2022-10-18 · $17
Meals for Sientra High Strength Cohesive Silicone Gel Breast Implant · 2022-08-19 · $34
Astellas Pharma US
Lexiscan
$23
1 payment
Meals for Lexiscan · 2022-03-16 · $23
2021: $417
Payments by company in 2021
TELA Bio
Ovitex Reinforced Bioscaffold With Permanent Polymer (Ovitex)
$174
3 payments
Meals for Ovitex Reinforced Bioscaffold With Permanent Polymer (Ovitex) · 2021-12-12 · $83
Meals for Ovitex Reinforced Bioscaffold With Permanent Polymer (Ovitex) · 2021-12-05 · $75
Meals for Ovitex Reinforced Bioscaffold With Permanent Polymer (Ovitex) · 2021-11-20 · $16
Boston Scientific
Watchman
$125
1 payment
Meals for Watchman · 2021-12-02 · $125
Abiomed
Impella
$50
2 payments
Meals for Impella · 2021-12-27 · $35
Meals for Impella · 2021-10-08 · $15
Abbott Laboratories
Optis Coronary Imaging System
$39
3 payments
Meals for Optis Coronary Imaging System · 2021-05-20 · $12
Meals for Optis Coronary Imaging System · 2021-03-31 · $16
Meals for Xience Sierra Coronary Stent · 2021-01-25 · $11
Biotronik
Rivacor
$29
1 payment
Meals for Rivacor · 2021-05-04 · $29
2020: $44
Payments by company in 2020
Biotronik
—None
$29
2 payments
Meals · 2020-10-16 · $14
Education · 2020-09-25 · $16
Medtronic Vascular
Reveal Linq
$15
1 payment
Meals for Reveal Linq · 2020-10-30 · $15
2019: $16
Payments by company in 2019
Maquet Cardiovascular U.S. Sales L.L.C.
Hema
$16
1 payment
Meals for Hema · 2019-10-14 · $16
Professional record
NPI
1144455940
Licence
CA A118680California A118680: Current · expires 2027-04-30
Trained
Oregon Health Sciences University School of Medicine, 2009
Gender
Male
More record details
Sole proprietor
Yes
Taxonomy
Cardiology (207RC0000X); Internal medicine (207R00000X); Federal specialty code 207RI0011X (207RI0011X); Federal specialty code 207UN0901X (207UN0901X)
Mailing address
525 South Dr Ste 105, Mountain View, CA, 94040
NPI first listed
2009-05-22
NPI last updated
2024-04-15
NPI record certified
2024-04-15
This is when the NPI record was last certified, not a medical board exam.
Extra NPI addresses: 300 Pasteur Dr, Stanford, CA, 94305