We could not verify current plan participation for this doctor. This does not mean they are out of network. Call Dr. Mercer’s office at (650) 723-4000 to ask if they take your plan before you enroll.
Original Medicare doctor bills
$8,766
Medicare paid this office $8,766 for 61 people.
This is what Medicare paid the clinician — not Medicare Advantage, and not the pharmacy.
Largest Original Medicare bills
Critical care, first 30-74 minutes
25
$4,289
$172
Emergency department visit with high level of medical decision making
24
$3,165
$132
Emergency department visit with moderate level of medical decision making
11
$921
$84
Who their Medicare patients are
61 Original Medicare patients in 2024. Average age 69 · Under 65 25% · Women 51% · Health risk score 2.37. Above the middle of the specialty; the typical emergency medicine clinician is at 2.01.
The office billed $53,731, Medicare allowed $12,140 and paid $8,766; for 69 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
61
69
69
2.37
$53,731
$8,766
2023
90
111
70
2.50
$77,411
$13,193
2022
78
88
68
1.82
$64,940
$11,214
2021
81
91
66
1.81
$61,032
$10,560
2020
84
92
67
2.53
$66,356
$12,444
2019
160
174
66
2.29
$119,018
$22,437
2018
146
175
67
2.21
$112,856
$20,684
2017
109
126
67
1.75
$82,770
$14,903
2016
87
106
64
2.18
$65,368
$12,041
2015
171
200
64
1.96
$122,649
$22,764
2014
163
199
64
1.68
$117,388
$21,935
2013
230
276
63
1.84
$175,591
$31,074
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: 3 services
Original Medicare services billed in 2023
Emergency department visit with high level of medical decision making
37
$5,268
$142
Critical care, first 30-74 minutes
20
$3,711
$186
Emergency department visit with moderate level of medical decision making
32
$2,923
$89
2022: 3 services
Original Medicare services billed in 2022
Critical care, first 30-74 minutes
27
$5,077
$188
Emergency department visit with high level of medical decision making
22
$3,076
$140
Emergency department visit with moderate level of medical decision making
21
$1,902
$91
2021: 2 services
Original Medicare services billed in 2021
Emergency department visit with high level of medical decision making
37
$5,130
$139
Emergency department visit with moderate level of medical decision making
29
$2,772
$96
2020: 3 services
Original Medicare services billed in 2020
Emergency department visit with high level of medical decision making
39
$5,609
$144
Critical care, first 30-74 minutes
20
$3,844
$192
Emergency department visit with moderate level of medical decision making
21
$2,163
$103
2019: 3 services
Original Medicare services billed in 2019
Emergency department visit with high level of medical decision making
73
$10,749
$147
Critical care, first 30-74 minutes
30
$5,801
$193
Emergency department visit with moderate level of medical decision making
47
$4,616
$98
2018: 4 services
Original Medicare services billed in 2018
Emergency department visit with high level of medical decision making
72
$10,515
$142
Emergency department visit with moderate level of medical decision making
46
$4,616
$96
Critical care, first 30-74 minutes
22
$4,186
$190
Emergency department visit with low level of medical decision making
12
$622
$52
2017: 3 services
Original Medicare services billed in 2017
Emergency department visit with high level of medical decision making
49
$6,878
$140
Emergency department visit with moderate level of medical decision making
35
$3,382
$94
Critical care, first 30-74 minutes
16
$3,007
$188
2016: 4 services
Original Medicare services billed in 2016
Emergency department visit with high level of medical decision making
31
$4,783
$145
Critical care, first 30-74 minutes
19
$3,534
$186
Emergency department visit with moderate level of medical decision making
25
$2,478
$99
Emergency department visit with low level of medical decision making
14
$724
$52
2015: 4 services
Original Medicare services billed in 2015
Emergency department visit with high level of medical decision making
83
$12,629
$147
Emergency department visit with moderate level of medical decision making
42
$4,339
$101
Critical care, first 30-74 minutes
17
$3,353
$197
Emergency department visit with low level of medical decision making
26
$1,119
$40
2014: 4 services
Original Medicare services billed in 2014
Emergency department visit with high level of medical decision making
74
$11,233
$146
Emergency department visit with moderate level of medical decision making
46
$4,425
$96
Critical care, first 30-74 minutes
15
$2,941
$196
Emergency department visit with low level of medical decision making
33
$1,629
$49
2013: 5 services
Original Medicare services billed in 2013
Emergency department visit with high level of medical decision making
99
$14,400
$141
Emergency department visit with moderate level of medical decision making
49
$4,585
$92
Critical care, first 30-74 minutes
24
$4,561
$190
Initial hospital observation care per day, typically 70 minutes
12
$1,813
$151
Emergency department visit with low level of medical decision making
38
$1,744
$46
Medicaid work
$5,179 in 2024
Medicaid paid $5,179 for 192 billed services this clinician did in 2024, up to 18 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 2024
EMERGENCY DEPARTMENT VISIT HIGH MDM
32
$1,631
Service
16
$1,167
Blood gases measurement
14
$809
Basic metabolic panel (Calcium, total) This panel must include the following: Calcium, total (82310) Carbon dioxide (bicarbonate) (82374) Chloride (82435) Creatinine (82565) Glucose (82947) Potassium (84132) Sodium (84295) Urea nitrogen (BUN) (84520)
45
$635
Blood count; complete (CBC), automated (Hgb, Hct, RBC, WBC and platelet count) and automated differential WBC count
44
$539
Lactate (lactic acid)
13
$281
Service
28
$116
Medicaid work by year
2024
192
7
18
$5,179
2023
189
5
25
$7,504
2022
407
12
31
$7,564
2021
293
8
19
$7,774
2020
270
7
21
$8,464
2019
482
9
36
$11,626
2018
397
4
34
$15,561
See the largest Medicaid services in earlier years
2023
Largest Medicaid services in 2023
EMERGENCY DEPT VISIT MOD MDM
82
$4,052
EMERGENCY DEPARTMENT VISIT HIGH MDM
26
$2,059
Service
14
$555
Blood count; complete (CBC), automated (Hgb, Hct, RBC, WBC and platelet count) and automated differential WBC count
39
$428
Basic metabolic panel (Calcium, total) This panel must include the following: Calcium, total (82310) Carbon dioxide (bicarbonate) (82374) Chloride (82435) Creatinine (82565) Glucose (82947) Potassium (84132) Sodium (84295) Urea nitrogen (BUN) (84520)
28
$409
2022
Largest Medicaid services in 2022
EMERGENCY DEPARTMENT VISIT HIGH MDM
33
$2,297
EMERGENCY DEPT VISIT MOD MDM
64
$1,510
EMERGENCY DEPARTMENT VISIT MAY NOT REQ PHYS/QHP
51
$1,452
Blood gases measurement
15
$730
Blood count; complete (CBC), automated (Hgb, Hct, RBC, WBC and platelet count) and automated differential WBC count
59
$415
Electrocardiogram, routine ECG with at least 12 leads; tracing only, without interpretation and report
12
$368
Basic metabolic panel (Calcium, total) This panel must include the following: Calcium, total (82310) Carbon dioxide (bicarbonate) (82374) Chloride (82435) Creatinine (82565) Glucose (82947) Potassium (84132) Sodium (84295) Urea nitrogen (BUN) (84520)
42
$314
Lactate (lactic acid)
13
$195
Miscellaneous therapeutic items and supplies, retail purchases, not otherwise classified; identify product in "remarks"
58
$180
HEPATIC FUNCTION PANEL
13
$64
BLOOD COUNT HEMATOCRIT
13
$33
Immunization administration (includes percutaneous, intradermal, subcutaneous, or intramuscular injections); 1 vaccine (single or combination vaccine/toxoid)
34
$6
2021
Largest Medicaid services in 2021
EMERGENCY DEPARTMENT VISIT HIGH MDM
40
$2,890
EMERGENCY DEPT VISIT MOD MDM
62
$2,666
EMERGENCY DEPARTMENT VISIT MAY NOT REQ PHYS/QHP
66
$1,162
Immunization administration by intramuscular injection of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) (coronavirus disease [COVID-19]) vaccine, DNA, spike protein, adenovirus type 26 (Ad26) vector, preservative free, 5x1010 viral particles/0.5 mL dosage; single dose
19
$494
EMERGENCY DEPT VISIT LOW MDM
12
$210
Blood count; complete (CBC), automated (Hgb, Hct, RBC, WBC and platelet count) and automated differential WBC count
39
$175
Miscellaneous therapeutic items and supplies, retail purchases, not otherwise classified; identify product in "remarks"
42
$128
Basic metabolic panel (Calcium, total) This panel must include the following: Calcium, total (82310) Carbon dioxide (bicarbonate) (82374) Chloride (82435) Creatinine (82565) Glucose (82947) Potassium (84132) Sodium (84295) Urea nitrogen (BUN) (84520)
13
$50
2020
Largest Medicaid services in 2020
EMERGENCY DEPARTMENT VISIT HIGH MDM
87
$6,784
EMERGENCY DEPT VISIT MOD MDM
27
$652
2019-ncov coronavirus, sars-cov-2/2019-ncov (covid-19), any technique, multiple types or subtypes (includes all targets), non-cdc
14
$359
EMERGENCY DEPARTMENT VISIT MAY NOT REQ PHYS/QHP
61
$290
Blood count; complete (CBC), automated (Hgb, Hct, RBC, WBC and platelet count) and automated differential WBC count
43
$192
Basic metabolic panel (Calcium, total) This panel must include the following: Calcium, total (82310) Carbon dioxide (bicarbonate) (82374) Chloride (82435) Creatinine (82565) Glucose (82947) Potassium (84132) Sodium (84295) Urea nitrogen (BUN) (84520)
26
$118
Radiologic examination, chest; single view
12
$68
2019
Largest Medicaid services in 2019
EMERGENCY DEPARTMENT VISIT HIGH MDM
111
$6,271
EMERGENCY DEPT VISIT MOD MDM
133
$3,042
Service
27
$1,045
Electrocardiogram, routine ECG with at least 12 leads; tracing only, without interpretation and report
26
$406
EMERGENCY DEPT VISIT LOW MDM
13
$281
Basic metabolic panel (Calcium, total) This panel must include the following: Calcium, total (82310) Carbon dioxide (bicarbonate) (82374) Chloride (82435) Creatinine (82565) Glucose (82947) Potassium (84132) Sodium (84295) Urea nitrogen (BUN) (84520)
40
$212
Blood count; complete (CBC), automated (Hgb, Hct, RBC, WBC and platelet count) and automated differential WBC count
42
$187
EMERGENCY DEPARTMENT VISIT MAY NOT REQ PHYS/QHP
40
$97
Miscellaneous therapeutic items and supplies, retail purchases, not otherwise classified; identify product in "remarks"
50
$85
2018
Largest Medicaid services in 2018
EMERGENCY DEPARTMENT VISIT HIGH MDM
199
$9,872
EMERGENCY DEPT VISIT MOD MDM
135
$3,891
Service
44
$1,671
Service
19
$127
Checkups this office reported
Medicare did not publish checkup rates for this clinician.
Medicare’s overall office score
91.9 / 100
Scores the office’s reporting and systems. It is not a grade for how the doctor treats you.
Professional record
NPI
1104014265
More record details
Sole proprietor
No
Taxonomy
Federal specialty code 207P00000X (207P00000X); Federal specialty code 207PE0004X (207PE0004X)
Mailing address
300 Pasteur Dr, Stanford, CA, 94305
NPI first listed
2007-10-12
NPI last updated
2026-06-12
NPI record certified
2026-06-12
This is when the NPI record was last certified, not a medical board exam.