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Bertha H Chen, MD

Obstetrics/Gynecology · Stanford

NPI 1023151115

Medicare standing
Clear
Enrolled, allowed to bill and order, not excluded
Plans that list them
17
3 carriers
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.

Plans that list them

17 plans · 3 carriers

A missing listing does not mean out of network. Directories change, and a listing does not cover every office. Call Dr. Chen’s office at (650) 723-4000 to confirm they take your plan. Ask about the office you use, its medical group, referrals and appointments.

17 of 17 plans

Plans whose provider directory lists this clinician
Alignment Health BreathEasy (HMO C-SNP)Alignment Health PlanListedOct 3, 2026
Alignment Health Clarity (HMO C-SNP)Alignment Health PlanListedOct 3, 2026
Alignment Health Harmony (HMO)Alignment Health PlanListedOct 3, 2026
Alignment Health Heart & Diabetes (HMO C-SNP)Alignment Health PlanListedOct 3, 2026
Alignment Health Heart & Diabetes CalPlus (HMO C-SNP)Alignment Health PlanListedOct 3, 2026
Alignment Health Heart & Diabetes Care (HMO C-SNP)Alignment Health PlanListedSep 28, 2026
Alignment Health Heart & Diabetes Choice (HMO C-SNP)Alignment Health PlanListedSep 28, 2026
Alignment Health Honor+ Plan (HMO)Alignment Health PlanListedOct 3, 2026
Alignment Health My Choice CalCare (HMO)Alignment Health PlanListedOct 3, 2026
Alignment Health Silicon (HMO C-SNP)Alignment Health PlanListedOct 3, 2026
Alignment Health smartHMO (HMO)Alignment Health PlanListedOct 3, 2026
Alignment Health the ONE (HMO)Alignment Health PlanListedOct 3, 2026
SCAN Balance (HMO C-SNP)SCAN Health PlanListedOct 3, 2026
SCAN Classic (HMO)SCAN Health PlanListedOct 3, 2026
SCAN MyChoice (HMO)SCAN Health PlanListedOct 3, 2026
SCAN Strive (HMO C-SNP)SCAN Health PlanListedOct 3, 2026
DualConnect (HMO D-SNP)Santa Clara Family Health PlanListedSep 1, 2026

California Medical Board record

Licence G76784 · Current

Licensed to practise in California · since 1993 · expires 2026-12-31 · Stanford University School of Medicine.

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

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 it
    Overall 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.

Every scored measure at Stanford Health Care
Perioperative pulmonary embolism or deep vein thrombosis rateComplications and deaths5.31 (4.24 to 6.37) · 8,661 casesWorseJul 2022 – Jun 2024
Rate of inpatient admissions for patients receiving outpatient chemotherapyUnplanned return visits14.1 (12.7 to 15.7) · 2,191 casesWorseJan 2024 – Dec 2024
Postoperative respiratory failure rateComplications and deaths4.08 (1.95 to 6.21) · 5,296 casesBetterJul 2022 – Jun 2024
Catheter Associated Urinary Tract Infections (ICU + select Wards)Infections0.317BetterOct 2024 – Sep 2025
Clostridium Difficile (C.Diff)Infections0.446BetterOct 2024 – Sep 2025
SSI - Colon SurgeryInfections0.241BetterOct 2024 – Sep 2025
Ratio of unplanned hospital visits after hospital outpatient surgeryUnplanned return visits0.7 (0.6 to 0.9) · 3,348 casesBetterJan 2024 – Dec 2024
Abdominopelvic accidental puncture or laceration rateComplications and deaths1.06 (0.45 to 1.67) · 5,374 casesNo differentJul 2022 – Jun 2024
CMS Medicare PSI 90: Patient safety and adverse events compositeComplications and deaths0.86 (0.72 to 1)No differentJul 2022 – Jun 2024
Death rate among surgical inpatients with serious treatable complicationsComplications and deaths166.09 (137.88 to 194.3) · 470 casesNo differentJul 2022 – Jun 2024
Death rate for CABG surgery patientsComplications and deaths1.1 · 192 casesNoneJul 2022 – Jun 2025
Death rate for COPD patientsComplications and deaths6.4 · 146 casesNoneJul 2022 – Jun 2025
Death rate for heart attack patientsComplications and deaths9.7 · 253 casesNoneJul 2022 – Jun 2025
Death rate for heart failure patientsComplications and deaths6.3 · 880 casesNoneJul 2022 – Jun 2025
Death rate for pneumonia patientsComplications and deaths10.3 · 935 casesNoneJul 2022 – Jun 2025
Death rate for stroke patientsComplications and deaths8.7 · 501 casesNoneJul 2023 – Jun 2025
Hybrid Hospital-Wide All-Cause Risk Standardized Mortality RateComplications and deaths2.1 · 7,730 casesNoneJul 2024 – Jun 2025
Iatrogenic pneumothorax rateComplications and deaths0.13 (0 to 0.27) · 20,799 casesNo differentJul 2022 – Jun 2024
In-hospital fall-associated fracture rateComplications and deaths0.28 (0.14 to 0.43) · 23,182 casesNo differentJul 2022 – Jun 2024
Postoperative acute kidney injury requiring dialysis rateComplications and deaths0.94 (0.2 to 1.68) · 5,694 casesNo differentJul 2022 – Jun 2024
Postoperative hemorrhage or hematoma rateComplications and deaths2.36 (1.54 to 3.19) · 7,846 casesNo differentJul 2022 – Jun 2024
Postoperative sepsis rateComplications and deaths5.2 (3.76 to 6.64) · 5,603 casesNo differentJul 2022 – Jun 2024
Postoperative wound dehiscence rateComplications and deaths1.38 (0.23 to 2.53) · 2,211 casesNo differentJul 2022 – Jun 2024
Pressure ulcer rateComplications and deaths0.52 (0.21 to 0.83) · 19,915 casesNo differentJul 2022 – Jun 2024
Rate of complications for hip/knee replacement patientsComplications and deaths3.6 · 416 casesNoneApr 2023 – Mar 2025
Central Line Associated Bloodstream Infection (ICU + select Wards)Infections0.869No differentOct 2024 – Sep 2025
MRSA BacteremiaInfections0.857No differentOct 2024 – Sep 2025
SSI - Abdominal HysterectomyInfections0.368No differentOct 2024 – Sep 2025
Acute Myocardial Infarction (AMI) 30-Day Readmission RateUnplanned return visits16.2 · 247 casesNoneJul 2023 – Jun 2025
Heart failure (HF) 30-Day Readmission RateUnplanned return visits20.5 · 1,021 casesNoneJul 2023 – Jun 2025
Hospital return days for heart attack patientsUnplanned return visits47.8 · 258 casesNoneJul 2022 – Jun 2025
Hospital return days for heart failure patientsUnplanned return visits-1.6 · 990 casesNoneJul 2022 – Jun 2025
Hospital return days for pneumonia patientsUnplanned return visits20.8 · 976 casesNoneJul 2022 – Jun 2025
Pneumonia (PN) 30-Day Readmission RateUnplanned return visits16.5 · 959 casesNoneJul 2023 – Jun 2025
Rate of emergency department (ED) visits for patients receiving outpatient chemotherapyUnplanned return visits5.2 (4.4 to 6.2) · 2,191 casesNo differentJan 2024 – Dec 2024
Rate of readmission after hip/knee replacementUnplanned return visits5.1 · 425 casesNoneJul 2023 – Jun 2025
Rate of readmission for CABGUnplanned return visits9.6 · 158 casesNoneJul 2023 – Jun 2025
Rate of readmission for chronic obstructive pulmonary disease (COPD) patientsUnplanned return visits19.6 · 183 casesNoneJul 2023 – Jun 2025
Rate of unplanned hospital visits after colonoscopy (per 1,000 colonoscopies)Unplanned return visits12.7 (10.4 to 15.4) · 4,578 casesNo differentJan 2022 – Dec 2024

What patients said (6,810 patients answered, 25% of those asked)

Patient survey stars by topic at Stanford Health Care
Cleanliness4
Nurse communication4
Doctor communication4
Communication about medicines3
Discharge information4
Overall hospital rating4
Quietness2
Recommend hospital5
Share of patients giving the best answer at Stanford Health Care
Room was "always" clean75%
Nurses "always" communicated well82%
Doctors "always" communicated well81%
Staff "always" explained63%
Yes, staff "did" give patients this information89%
Yes, staff "did" give patients information about help after discharge89%
Doctors "always" explained things so they could understand76%
Doctors "always" listened carefully80%
Doctors "always" treated them with courtesy and respect87%
Patients who gave a rating of "9" or "10" (high)79%
Staff "always" explained new medications76%
Nurses "always" explained things so they could understand77%
Nurses "always" listened carefully79%
Nurses "always" treated them with courtesy and respect88%
"Always" quiet at night53%
"YES", patients would definitely recommend the hospital83%
Staff "always" explained possible side effects50%
Yes, staff "did" give patients information about possible symptoms90%

Original Medicare doctor bills

$32,639

Medicare paid this office $32,639 for 128 people.

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

Largest Original Medicare bills
Return visit (30+ min)50$5,522$85
Return visit (30+ min)16$2,791$121
New patient visit (45+ min)22$2,047$93
Short return visit (20+ min)33$1,876$54
New patient visit (60+ min)14$1,716$123
See all 7 services
Every Original Medicare service billed
Return visit (30+ min)50$5,522$85
Return visit (30+ min)16$2,791$121
New patient visit (45+ min)22$2,047$93
Short return visit (20+ min)33$1,876$54
New patient visit (60+ min)14$1,716$123
Long return visit (40+ min)12$1,389$99
Fitting and insertion of vaginal support device15$516$32

Procedures Medicare counted

Procedure volume Medicare published
Removal of the uterus1-10None

Who their Medicare patients are

128 Original Medicare patients in 2024. Average age 76 · Women 100% · Health risk score 0.91. Above the middle of the specialty; the typical obstetrics & gynecology clinician is at 0.88.

Conditions among them: High blood pressure 60% · Cancer 19% · Diabetes 17% · Coronary heart disease 16% · Depression 16% · Chronic kidney disease 11%.

The office billed $214,925, Medicare allowed $44,099 and paid $32,639; for 278 services of 31 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
2024128278760.91$214,925$32,639
2023156364760.95$268,151$49,240
2022110216760.84$150,384$26,976
2021197518750.87$319,627$63,461
2020148310741.09$122,684$26,955
2019207583751.01$258,830$53,563
2018198527731.10$267,940$52,673
2017174469741.06$210,940$42,299
2016115251730.88$124,457$23,592
2015112266740.91$144,953$26,133
2014117222730.89$112,543$21,347
2013128341720.96$143,927$26,676

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

Original Medicare services billed in 2023
Return visit (30+ min)62$6,555$84
Long return visit (40+ min)31$5,053$133
New patient visit (45+ min)44$4,731$108
Short return visit (20+ min)44$2,710$52
New patient visit (60+ min)15$2,305$154
Fitting and insertion of vaginal support device30$1,080$34

2022: 5 services

Original Medicare services billed in 2022
Return visit (30+ min)50$5,036$87
Short return visit (20+ min)41$2,583$57
Long return visit (40+ min)13$1,680$120
New patient visit (45+ min)12$1,359$113
Fitting and insertion of vaginal support device11$374$29

2021: 9 services

Original Medicare services billed in 2021
Long return visit (40+ min)51$9,244$123
Return visit (30+ min)68$7,314$82
New patient visit (45+ min)63$6,774$108
Short return visit (20+ min)64$4,420$52
New patient visit (60+ min)24$3,937$164
Complex measurement of pressure of urine flow in bladder with urethra pressure and voiding pressure studies16$1,856$116
Fitting and insertion of vaginal support device22$700$25
Insertion of device into abdomen with pressure and urine flow rate study16$582$36
Electronic assessment of bladder emptying17$71$4

2020: 5 services

Original Medicare services billed in 2020
New patient visit (45+ min)46$5,051$110
Return visit (30+ min)54$4,151$72
Short return visit (20+ min)64$3,624$43
Long return visit (40+ min)14$1,463$98
Fitting and insertion of vaginal support device19$432$21

2019: 10 services

Original Medicare services billed in 2019
Return visit (30+ min)83$7,732$70
New patient visit (45+ min)64$7,110$111
Short return visit (20+ min)89$5,154$43
Complex measurement of pressure of urine flow in bladder with urethra pressure and voiding pressure studies26$2,890$111
Long return visit (40+ min)28$2,827$97
New patient visit (60+ min)12$1,780$148
Diagnostic exam of bladder and urethra using an endoscope21$1,448$69
Fitting and insertion of vaginal support device27$1,200$34
Insertion of device into abdomen with pressure and urine flow rate study26$931$36
Electronic assessment of bladder emptying26$97$4

2018: 10 services

Original Medicare services billed in 2018
New patient visit (45+ min)61$6,490$106
Return visit (30+ min)70$5,001$60
Short return visit (20+ min)81$4,086$40
Long return visit (40+ min)32$3,537$96
New patient visit (60+ min)20$2,867$143
Fitting and insertion of vaginal support device47$2,073$36
Complex measurement of pressure of urine flow in bladder with urethra pressure and voiding pressure studies20$2,069$103
Diagnostic exam of bladder and urethra using an endoscope14$858$61
Insertion of device into abdomen with pressure and urine flow rate study20$726$36
Electronic assessment of bladder emptying21$87$4

2017: 9 services

Original Medicare services billed in 2017
New patient visit (45+ min)62$6,440$104
Return visit (30+ min)65$5,433$66
Short return visit (20+ min)65$3,856$40
Complex measurement of pressure of urine flow in bladder with urethra pressure and voiding pressure studies28$3,127$112
New patient visit (60+ min)17$2,500$147
Long return visit (40+ min)21$2,391$100
Fitting and insertion of vaginal support device29$1,103$37
Insertion of device into abdomen with pressure and urine flow rate study28$1,015$36
Electronic assessment of bladder emptying28$106$4

2016: 7 services

Original Medicare services billed in 2016
New patient visit (45+ min)36$3,874$108
Return visit (30+ min)38$3,152$64
Short return visit (20+ min)53$2,440$39
Long return visit (40+ min)16$1,585$99
Complex measurement of pressure of urine flow in bladder with urethra pressure and voiding pressure studies12$1,066$89
Insertion of device into abdomen with pressure and urine flow rate study11$394$36
Electronic assessment of bladder emptying13$53$4

2015: 7 services

Original Medicare services billed in 2015
New patient visit (45+ min)43$4,158$97
Return visit (30+ min)52$4,042$66
Short return visit (20+ min)36$1,855$37
Complex measurement of pressure of urine flow in bladder with urethra pressure and voiding pressure studies11$1,195$109
Fitting and insertion of vaginal support device17$677$40
Insertion of device into abdomen with pressure and urine flow rate study11$394$36
Electronic assessment of bladder emptying11$42$4

2014: 3 services

Original Medicare services billed in 2014
New patient visit (45+ min)31$3,353$108
Return visit (30+ min)36$2,774$62
Short return visit (20+ min)51$2,456$42

2013: 8 services

Original Medicare services billed in 2013
New patient visit (45+ min)46$4,415$96
Short return visit (20+ min)66$3,615$40
Return visit (30+ min)38$3,054$64
Complex measurement of pressure of urine flow in bladder with urethra pressure and voiding pressure studies16$1,535$96
Fitting and insertion of vaginal support device23$1,001$36
Insertion of device into abdomen with pressure and urine flow rate study15$511$34
Short return visit18$365$20
Electronic assessment of bladder emptying14$50$4

Drugs they prescribed that Part D paid

$37,095

Pharmacies billed $37,095 in 2024.

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

Opioids were 0% of their Part D prescriptions (0 of 147) in 2024. At or below the middle of the specialty; the typical obstetrics & gynecology clinician is at 0%.

105 generic and 42 brand-name prescriptions · $37,095 in drug cost · 31 antibiotic prescriptions to 14 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.

Largest Part D drug costs
Gemtesa24$18,147$756
Myrbetriq12$13,288$1,107
Estradiol53$3,103$59
Cephalexin18$574$32
Oxybutynin Chloride Er17$332$20

Year by year

Part D prescribing by year
2024147530% (0)29%$37,095
2023108510% (0)37%$31,413
202263320% (0)30%$8,147
202113860None32%$25,420
202012852None31%$24,141
2019210790% (0)23%$27,590
2018196720% (0)26%$28,249
2017149480% (0)19%$19,678
201679320% (0)30%$10,785
20154123NoneNone$7,077
20147937None38%$9,109
201310744None39%$13,527

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

See the drugs prescribed each year

2023: 4 drugs

Part D drugs prescribed in 2023
Gemtesa23$15,053$654
Myrbetriq14$11,506$822
Estradiol26$2,828$109
Oxybutynin Chloride Er15$567$38

2022: 2 drugs

Part D drugs prescribed in 2022
Estradiol18$3,013$167
Nitrofurantoin Mono-Macro16$179$11

2021: 4 drugs

Part D drugs prescribed in 2021
Myrbetriq20$9,506$475
Estradiol41$6,910$169
Nitrofurantoin Mono-Macro17$226$13
Cephalexin14$92$7

2020: 5 drugs

Part D drugs prescribed in 2020
Estradiol33$7,880$239
Myrbetriq11$4,148$377
Oxybutynin Chloride Er22$1,172$53
Estradiol (Once Weekly)13$1,156$89
Nitrofurantoin Mono-Macro15$211$14

2019: 4 drugs

Part D drugs prescribed in 2019
Estradiol47$8,509$181
Oxybutynin Chloride Er40$1,510$38
Trospium Chloride12$832$69
Nitrofurantoin Mono-Macro26$448$17

2018: 6 drugs

Part D drugs prescribed in 2018
Vesicare16$7,962$498
Myrbetriq13$7,005$539
Estradiol17$3,712$218
Oxybutynin Chloride Er38$1,552$41
Trospium Chloride26$1,139$44
Nitrofurantoin Mono-Macro16$287$18

2017: 4 drugs

Part D drugs prescribed in 2017
Estrace17$4,833$284
Trospium Chloride37$3,356$91
Oxybutynin Chloride Er30$1,062$35
Nitrofurantoin Mono-Macro14$244$17

2016: 2 drugs

Part D drugs prescribed in 2016
Tolterodine Tartrate Er11$1,485$135
Oxybutynin Chloride Er16$295$18

2014: 1 drug

Part D drugs prescribed in 2014
Estrace14$2,333$167

2013: 5 drugs

Part D drugs prescribed in 2013
Premarin12$2,186$182
Estrace13$1,833$141
Oxybutynin Chloride Er19$1,416$75
Vagifem11$1,028$93
Sulfamethoxazole-Trimethoprim12$65$5

Money from drug and device companies

$44 in 2025

Industry payments by year
202512None$44
2024213None$1,670
202311None$26
202011None$25
201923None$151

Paid work is consulting, speaking, honoraria and royalties, as opposed to meals and travel.

A payment is not proof that care is biased.

Payments by company
Bluewind MedicalRevi$44
2 payments
  • Meals for Revi · 2025-10-24 · $19
  • Meals for Revi · 2025-06-13 · $25
See all 2 published payments
Every published payment
Bluewind MedicalMeals · 2025-10-24Revi$19
Bluewind MedicalMeals · 2025-06-13Revi$25
See earlier years (2024, 2023, 2020, 2019)

2024: $1,670

Payments by company in 2024
AxonicsAxonics$1,525
12 payments
  • Meals for Axonics · 2024-05-07 · $43
  • Meals for Bulkamid · 2024-04-16 · $27
  • Meals for Bulkamid · 2024-04-16 · $123
  • Travel for Axonics · 2024-04-16 · $39
  • Travel for Axonics · 2024-04-16 · $21
  • Travel for Axonics · 2024-04-13 · $71
  • Travel for Axonics · 2024-04-13 · $77
  • Travel for Axonics · 2024-04-12 · $179
  • Meals for Axonics · 2024-04-11 · $47
  • Meals for Axonics · 2024-04-11 · $38
  • Travel for Axonics · 2024-04-09 · $461
  • Travel for Axonics · 2024-02-19 · $400
ColoplastAltis$145
1 payment
  • Meals for Altis · 2024-08-16 · $145

2023: $26

Payments by company in 2023
Boston ScientificNone$26
1 payment
  • Meals · 2023-08-10 · $26

2020: $25

Payments by company in 2020
AllerganBotox$25
1 payment
  • Meals for Botox · 2020-11-14 · $25

2019: $151

Payments by company in 2019
AllerganBotox Cosmetic$132
2 payments
  • Meals for Botox Cosmetic · 2019-02-26 · $109
  • Meals for Botox · 2019-01-08 · $22
Ferring PharmaceuticalsNocdurna$19
1 payment
  • Meals for Nocdurna · 2019-02-27 · $19

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
1023151115
Licence
CA G76784California G76784: Current · expires 2026-12-31
Trained
Stanford University School of Medicine, 1991
Video visits
Lists video visits
Gender
Female
More record details
Sole proprietor
No
Taxonomy
Federal specialty code 207VF0040X (207VF0040X); Federal specialty code 207VG0400X (207VG0400X)
Mailing address
1804 Embarcadero Rd, Ste 100, Palo Alto, CA, 94303
NPI first listed
2007-02-15
NPI last updated
2024-04-19
NPI record certified
2024-04-19

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