Martha Meredith Masters, MD
Emergency Medicine · Stanford
- Medicare standing
- Clear
- Enrolled, allowed to bill and order, not excluded
- Plans that list them
- Not verified
- Not the same as out of network.
- Office
- 1
Offices
1 location · Stanford Health Care · 3,152 clinicians in this group
Looking this up.
Hospitals listed: Stanford Health Care. 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. Masters’s office at (650) 723-4000 to ask if they take your plan before you enroll.
California Medical Board record
Licence A169089 · Current
Licensed to practise in California · since 2020 · expires 2028-06-30 · University of Southern California Keck School of Medicine.
No disciplinary actions, convictions, malpractice judgments or citations in this record.
State licence records
1 licence
- New Jersey 25MA10112400Medical Doctor · since 2017 · expires 2021-06-30InactiveNo board action on this licenceCheck it with the state
We check Colorado, Delaware, Florida, Illinois, Maryland, New Jersey, New York, Tennessee, Texas, Virginia, Washington, plus California above. A state that is not in this list has not been checked, which is not the same as clear.
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.
- Stanford Health CareStanford, CAAcute Care Hospital · Voluntary non-profit - Private · Has an emergency departmentPart of Stanford Health Care, which runs 3 hospitalsHome of Stanford Cancer Institute, a National Cancer Institute designated comprehensive cancer centrePatients rate it 4 of 5 · 83% would definitely recommend itOverall rating: 5 of 5 starsWorse than the national rate — Perioperative pulmonary embolism or deep vein thrombosis rate: 5.31 (4.24 to 6.37) · 8,661 cases, Jul 2022 – Jun 2024Worse than the national rate — Rate of inpatient admissions for patients receiving outpatient chemotherapy: 14.1 (12.7 to 15.7) · 2,191 cases, Jan 2024 – Dec 2024Better than the national rate — Postoperative respiratory failure rate: 4.08 (1.95 to 6.21) · 5,296 cases, Jul 2022 – Jun 2024Better than the national rate — Catheter Associated Urinary Tract Infections (ICU + select Wards): 0.317, Oct 2024 – Sep 2025Better than the national rate — Clostridium Difficile (C.Diff): 0.446, Oct 2024 – Sep 2025Better than the national rate — SSI - Colon Surgery: 0.241, Oct 2024 – Sep 2025Better than the national rate — Ratio of unplanned hospital visits after hospital outpatient surgery: 0.7 (0.6 to 0.9) · 3,348 cases, Jan 2024 – Dec 2024
See every measure and the patient survey for Stanford Health Care
Behind the star rating — Deaths: 5 better, 3 the same, 0 worse of 8 measures. Safety: 3 better, 5 the same, 0 worse of 8 measures. Readmissions: 2 better, 5 the same, 4 worse of 11 measures. The star rating is worked out from an earlier period than the measures below, so the two can disagree.
| Perioperative pulmonary embolism or deep vein thrombosis rateComplications and deaths | 5.31 (4.24 to 6.37) · 8,661 cases | Worse | Jul 2022 – Jun 2024 |
| Rate of inpatient admissions for patients receiving outpatient chemotherapyUnplanned return visits | 14.1 (12.7 to 15.7) · 2,191 cases | Worse | Jan 2024 – Dec 2024 |
| Postoperative respiratory failure rateComplications and deaths | 4.08 (1.95 to 6.21) · 5,296 cases | Better | Jul 2022 – Jun 2024 |
| Catheter Associated Urinary Tract Infections (ICU + select Wards)Infections | 0.317 | Better | Oct 2024 – Sep 2025 |
| Clostridium Difficile (C.Diff)Infections | 0.446 | Better | Oct 2024 – Sep 2025 |
| SSI - Colon SurgeryInfections | 0.241 | Better | Oct 2024 – Sep 2025 |
| Ratio of unplanned hospital visits after hospital outpatient surgeryUnplanned return visits | 0.7 (0.6 to 0.9) · 3,348 cases | Better | Jan 2024 – Dec 2024 |
| Abdominopelvic accidental puncture or laceration rateComplications and deaths | 1.06 (0.45 to 1.67) · 5,374 cases | No different | Jul 2022 – Jun 2024 |
| CMS Medicare PSI 90: Patient safety and adverse events compositeComplications and deaths | 0.86 (0.72 to 1) | No different | Jul 2022 – Jun 2024 |
| Death rate among surgical inpatients with serious treatable complicationsComplications and deaths | 166.09 (137.88 to 194.3) · 470 cases | No different | Jul 2022 – Jun 2024 |
| Death rate for CABG surgery patientsComplications and deaths | 1.1 · 192 cases | None | Jul 2022 – Jun 2025 |
| Death rate for COPD patientsComplications and deaths | 6.4 · 146 cases | None | Jul 2022 – Jun 2025 |
| Death rate for heart attack patientsComplications and deaths | 9.7 · 253 cases | None | Jul 2022 – Jun 2025 |
| Death rate for heart failure patientsComplications and deaths | 6.3 · 880 cases | None | Jul 2022 – Jun 2025 |
| Death rate for pneumonia patientsComplications and deaths | 10.3 · 935 cases | None | Jul 2022 – Jun 2025 |
| Death rate for stroke patientsComplications and deaths | 8.7 · 501 cases | None | Jul 2023 – Jun 2025 |
| Hybrid Hospital-Wide All-Cause Risk Standardized Mortality RateComplications and deaths | 2.1 · 7,730 cases | None | Jul 2024 – Jun 2025 |
| Iatrogenic pneumothorax rateComplications and deaths | 0.13 (0 to 0.27) · 20,799 cases | No different | Jul 2022 – Jun 2024 |
| In-hospital fall-associated fracture rateComplications and deaths | 0.28 (0.14 to 0.43) · 23,182 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative acute kidney injury requiring dialysis rateComplications and deaths | 0.94 (0.2 to 1.68) · 5,694 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative hemorrhage or hematoma rateComplications and deaths | 2.36 (1.54 to 3.19) · 7,846 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative sepsis rateComplications and deaths | 5.2 (3.76 to 6.64) · 5,603 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative wound dehiscence rateComplications and deaths | 1.38 (0.23 to 2.53) · 2,211 cases | No different | Jul 2022 – Jun 2024 |
| Pressure ulcer rateComplications and deaths | 0.52 (0.21 to 0.83) · 19,915 cases | No different | Jul 2022 – Jun 2024 |
| Rate of complications for hip/knee replacement patientsComplications and deaths | 3.6 · 416 cases | None | Apr 2023 – Mar 2025 |
| Central Line Associated Bloodstream Infection (ICU + select Wards)Infections | 0.869 | No different | Oct 2024 – Sep 2025 |
| MRSA BacteremiaInfections | 0.857 | No different | Oct 2024 – Sep 2025 |
| SSI - Abdominal HysterectomyInfections | 0.368 | No different | Oct 2024 – Sep 2025 |
| Acute Myocardial Infarction (AMI) 30-Day Readmission RateUnplanned return visits | 16.2 · 247 cases | None | Jul 2023 – Jun 2025 |
| Heart failure (HF) 30-Day Readmission RateUnplanned return visits | 20.5 · 1,021 cases | None | Jul 2023 – Jun 2025 |
| Hospital return days for heart attack patientsUnplanned return visits | 47.8 · 258 cases | None | Jul 2022 – Jun 2025 |
| Hospital return days for heart failure patientsUnplanned return visits | -1.6 · 990 cases | None | Jul 2022 – Jun 2025 |
| Hospital return days for pneumonia patientsUnplanned return visits | 20.8 · 976 cases | None | Jul 2022 – Jun 2025 |
| Pneumonia (PN) 30-Day Readmission RateUnplanned return visits | 16.5 · 959 cases | None | Jul 2023 – Jun 2025 |
| Rate of emergency department (ED) visits for patients receiving outpatient chemotherapyUnplanned return visits | 5.2 (4.4 to 6.2) · 2,191 cases | No different | Jan 2024 – Dec 2024 |
| Rate of readmission after hip/knee replacementUnplanned return visits | 5.1 · 425 cases | None | Jul 2023 – Jun 2025 |
| Rate of readmission for CABGUnplanned return visits | 9.6 · 158 cases | None | Jul 2023 – Jun 2025 |
| Rate of readmission for chronic obstructive pulmonary disease (COPD) patientsUnplanned return visits | 19.6 · 183 cases | None | Jul 2023 – Jun 2025 |
| Rate of unplanned hospital visits after colonoscopy (per 1,000 colonoscopies)Unplanned return visits | 12.7 (10.4 to 15.4) · 4,578 cases | No different | Jan 2022 – Dec 2024 |
What patients said (6,810 patients answered, 25% of those asked)
| Cleanliness | 4 |
| Nurse communication | 4 |
| Doctor communication | 4 |
| Communication about medicines | 3 |
| Discharge information | 4 |
| Overall hospital rating | 4 |
| Quietness | 2 |
| Recommend hospital | 5 |
| Room was "always" clean | 75% |
| Nurses "always" communicated well | 82% |
| Doctors "always" communicated well | 81% |
| Staff "always" explained | 63% |
| Yes, staff "did" give patients this information | 89% |
| Yes, staff "did" give patients information about help after discharge | 89% |
| 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) | 79% |
| Staff "always" explained new medications | 76% |
| Nurses "always" explained things so they could understand | 77% |
| Nurses "always" listened carefully | 79% |
| Nurses "always" treated them with courtesy and respect | 88% |
| "Always" quiet at night | 53% |
| "YES", patients would definitely recommend the hospital | 83% |
| Staff "always" explained possible side effects | 50% |
| Yes, staff "did" give patients information about possible symptoms | 90% |
Original Medicare doctor bills
$40,923
Medicare paid this office $40,923 for 281 people.
This is what Medicare paid the clinician — not Medicare Advantage, and not the pharmacy.
| Emergency department visit with high level of medical decision making | 181 | $26,493 | $144 |
| Critical care, first 30-74 minutes | 30 | $5,243 | $175 |
| Initial hospital care with moderate level of medical decision making at least 75 minutes | 24 | $3,728 | $155 |
| Emergency department visit with moderate level of medical decision making | 25 | $2,307 | $92 |
Who their Medicare patients are
281 Original Medicare patients in 2024. Average age 76 · Under 65 9% · 85 and older 25% · Women 54% · Also on Medicaid 34% · Health risk score 2.48. Above the middle of the specialty; the typical emergency medicine clinician is at 2.01.
Conditions among them: High blood pressure 75% · Coronary heart disease 44% · Chronic kidney disease 43% · Atrial fibrillation 41% · Diabetes 37% · Heart failure 36% · Depression 36% · Cancer 26% · Dementia 26% · COPD 24% · Stroke 19%.
The office billed $263,816, Medicare allowed $53,879 and paid $40,923; for 314 services of 24 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
| 2024 | 281 | 314 | 76 | 2.48 | $263,816 | $40,923 |
| 2023 | 343 | 391 | 76 | 2.26 | $294,396 | $49,860 |
| 2022 | 319 | 335 | 75 | 2.12 | $210,925 | $42,304 |
| 2021 | 251 | 278 | 75 | 2.08 | $193,444 | $36,002 |
| 2020 | 144 | 159 | 73 | 1.81 | $94,340 | $21,009 |
| 2019 | 127 | 137 | 66 | 2.85 | $110,668 | $17,685 |
| 2018 | 163 | 182 | 64 | 2.66 | $151,462 | $23,072 |
| 2017 | 16 | 17 | 65 | 3.08 | $15,506 | $2,450 |
| 2016 | 34 | 34 | 63 | 2.35 | $5,124 | $2,416 |
| 2015 | 15 | 15 | 68 | 1.69 | $4,085 | $1,114 |
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
| Emergency department visit with high level of medical decision making | 195 | $30,361 | $153 |
| Emergency department visit with moderate level of medical decision making | 72 | $7,426 | $103 |
| Critical care, first 30-74 minutes | 27 | $5,285 | $196 |
| Emergency department visit with low level of medical decision making | 17 | $1,021 | $60 |
| Ultrasound of heart, follow-up | 12 | $275 | $23 |
2022: 5 services
| Emergency department visit with high level of medical decision making | 110 | $17,927 | $163 |
| Emergency department visit with moderate level of medical decision making | 131 | $14,920 | $114 |
| Initial hospital observation care per day, typically 30 minutes | 16 | $1,624 | $101 |
| Hospital observation care on day of discharge | 19 | $1,570 | $83 |
| Emergency department visit with straightforward medical decision making | 11 | $422 | $38 |
2021: 5 services
| Emergency department visit with high level of medical decision making | 92 | $15,820 | $172 |
| Emergency department visit with moderate level of medical decision making | 90 | $10,805 | $120 |
| Initial hospital observation care per day, typically 70 minutes | 11 | $2,171 | $197 |
| Initial hospital observation care per day, typically 30 minutes | 16 | $1,616 | $101 |
| Hospital observation care on day of discharge | 12 | $999 | $83 |
2020: 4 services
| Emergency department visit with high level of medical decision making | 75 | $13,095 | $172 |
| Emergency department visit with moderate level of medical decision making | 19 | $2,343 | $117 |
| Hospital observation care on day of discharge | 15 | $1,037 | $69 |
| Emergency department visit with low level of medical decision making | 15 | $928 | $62 |
2019: 2 services
| Emergency department visit with high level of medical decision making | 97 | $13,863 | $140 |
| Emergency department visit with moderate level of medical decision making | 20 | $1,932 | $97 |
2018: 3 services
| Emergency department visit with high level of medical decision making | 118 | $16,959 | $139 |
| Critical care, first 30-74 minutes | 13 | $2,410 | $185 |
| Emergency department visit with moderate level of medical decision making | 24 | $2,276 | $91 |
2016: 1 service
| Emergency department visit with moderate level of medical decision making | 20 | $1,723 | $86 |
Medicaid work
$24,242 in 2024
Medicaid paid $24,242 for 227 billed services this clinician did in 2024, up to 34 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.
| EMERGENCY DEPARTMENT VISIT HIGH MDM | 227 | $24,242 |
| 2024 | 227 | 1 | 34 | $24,242 |
| 2023 | 306 | 3 | 29 | $23,773 |
| 2022 | 188 | 2 | 24 | $14,165 |
| 2021 | 239 | 4 | 37 | $13,056 |
| 2020 | 135 | 3 | 20 | $11,304 |
| 2019 | 780 | 5 | 46 | $144,092 |
| 2018 | 719 | 2 | 69 | $143,995 |
See the largest Medicaid services in earlier years
2023
| EMERGENCY DEPARTMENT VISIT HIGH MDM | 151 | $13,054 |
| EMERGENCY DEPT VISIT MOD MDM | 142 | $9,962 |
| EMERGENCY DEPT VISIT LOW MDM | 13 | $758 |
2022
| EMERGENCY DEPT VISIT MOD MDM | 176 | $12,697 |
| EMERGENCY DEPARTMENT VISIT HIGH MDM | 12 | $1,468 |
2021
| EMERGENCY DEPT VISIT MOD MDM | 152 | $9,269 |
| EMERGENCY DEPARTMENT VISIT HIGH MDM | 26 | $2,224 |
| EMERGENCY DEPT VISIT LOW MDM | 31 | $1,139 |
| EMERGENCY DEPARTMENT VISIT MAY NOT REQ PHYS/QHP | 30 | $424 |
2020
| EMERGENCY DEPARTMENT VISIT HIGH MDM | 63 | $7,615 |
| EMERGENCY DEPT VISIT LOW MDM | 47 | $2,220 |
| EMERGENCY DEPT VISIT MOD MDM | 25 | $1,469 |
2019
| EMERGENCY DEPARTMENT VISIT HIGH MDM | 436 | $94,824 |
| EMERGENCY DEPT VISIT MOD MDM | 239 | $42,141 |
| EMERGENCY DEPT VISIT LOW MDM | 70 | $7,127 |
| Eligible clinician attests to documenting in the medical record they obtained, updated, or reviewed the patient's current medications | 19 | $0 |
| Documentation of a medical reason(s) for not documenting, updating, or reviewing the patient's current medications list (e.g., patient is in an urgent or emergent medical situation) | 16 | $0 |
2018
| EMERGENCY DEPARTMENT VISIT HIGH MDM | 517 | $110,614 |
| EMERGENCY DEPT VISIT MOD MDM | 202 | $33,381 |
Checkups this office reported
Medicare did not publish checkup rates for this clinician.
- Medicare’s overall office score
- 76.5 / 100
- Scores the office’s reporting and systems. It is not a grade for how the doctor treats you.
Professional record
- NPI
- 1972948222
- Licence
- CA A169089, NJ 25MA10112400California A169089: Current · expires 2028-06-30New Jersey 25MA10112400: Inactive
- Group
- Stanford Health Care
- Gender
- Female
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
- 2013-04-30
- NPI last updated
- 2024-03-23
- NPI record certified
- 2024-03-23
This is when the NPI record was last certified, not a medical board exam.