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Cynthia F Woo, MD

Obstetrics/Gynecology · Palo Alto

NPI 1689741811

Medicare standing
Clear
Enrolled, allowed to bill and order, not excluded
Plans that list them
14
2 carriers
Offices
3

Offices

3 locations · Sutter Bay Medical Foundation · 3,783 clinicians in this group

Looking this up.

Plans that list them

14 plans · 2 carriers

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

14 of 14 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 Sutter Advantage +More (HMO)Alignment Health PlanListedOct 3, 2026
Alignment Health smartHMO (HMO)Alignment Health PlanListedOct 3, 2026
Alignment Health the ONE (HMO)Alignment Health PlanListedOct 3, 2026
DualConnect (HMO D-SNP)Santa Clara Family Health PlanListedSep 1, 2026

California Medical Board record

Licence A60887 · Current

Licensed to practise in California · since 1996 · expires 2028-02-29 · Emory University School of Medicine.

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

Original Medicare doctor bills

$9,984

Medicare paid this office $9,984 for 59 people.

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

Largest Original Medicare bills
Return visit (30+ min)36$6,496$118
New patient visit (30+ min)14$1,157$83

Procedures Medicare counted

Procedure volume Medicare published
Removal of skin lesions1-10None

Who their Medicare patients are

59 Original Medicare patients in 2024. Average age 76 · Women 100% · Health risk score 0.75. At or below the middle of the specialty; the typical obstetrics & gynecology clinician is at 0.88.

Conditions among them: High blood pressure 49% · Cancer 19%.

The office billed $36,820, Medicare allowed $13,453 and paid $9,984; for 94 services of 13 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
20245994760.75$36,820$9,984
20234777740.72$24,964$7,274
20224488740.64$34,724$9,569
202170115730.59$46,158$12,951
20205686740.85$26,432$6,827
201981117750.86$31,245$8,608
201889132730.77$33,928$8,701
201774116740.65$34,801$8,578
201685130730.71$39,433$10,079
201573130730.74$29,948$8,539
201482278710.65$35,121$9,069
201380126710.75$38,119$9,418

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: 2 services

Original Medicare services billed in 2023
Return visit (30+ min)25$4,382$112
New patient visit (30+ min)13$1,146$88

2022: 1 service

Original Medicare services billed in 2022
Return visit (30+ min)19$3,621$125

2021: 4 services

Original Medicare services billed in 2021
Short return visit (20+ min)19$2,579$86
Return visit (30+ min)17$2,421$127
New patient visit (30+ min)21$2,148$102
Cervical or vaginal cancer screening; pelvic and clinical breast examination11$539$49

2020: 2 services

Original Medicare services billed in 2020
Short return visit (20+ min)23$2,131$67
Return visit (30+ min)12$1,197$100

2019: 4 services

Original Medicare services billed in 2019
Short return visit (20+ min)27$2,609$67
New patient visit (15+ min)24$1,587$66
Return visit (30+ min)12$1,214$101
Cervical or vaginal cancer screening; pelvic and clinical breast examination11$522$47

2018: 4 services

Original Medicare services billed in 2018
Short return visit (20+ min)31$2,850$59
New patient visit (15+ min)21$1,363$65
New patient visit (30+ min)12$940$78
Cervical or vaginal cancer screening; pelvic and clinical breast examination16$729$46

2017: 2 services

Original Medicare services billed in 2017
Short return visit (20+ min)39$3,613$60
Cervical or vaginal cancer screening; pelvic and clinical breast examination13$597$46

2016: 3 services

Original Medicare services billed in 2016
Short return visit (20+ min)38$3,248$56
New patient visit (15+ min)16$1,058$66
Cervical or vaginal cancer screening; pelvic and clinical breast examination19$861$45

2015: 3 services

Original Medicare services billed in 2015
Short return visit (20+ min)38$4,584$62
New patient visit (15+ min)14$954$68
Cervical or vaginal cancer screening; pelvic and clinical breast examination13$619$48

2014: 2 services

Original Medicare services billed in 2014
Short return visit (20+ min)34$3,429$58
Cervical or vaginal cancer screening; pelvic and clinical breast examination17$764$45

2013: 3 services

Original Medicare services billed in 2013
Short return visit (20+ min)38$3,182$55
New patient visit (30+ min)15$1,109$74
Cervical or vaginal cancer screening; pelvic and clinical breast examination12$547$46

Drugs they prescribed that Part D paid

$13,613

Pharmacies billed $13,613 in 2024.

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

60 generic and 21 brand-name prescriptions · $13,613 in drug cost.

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
Estradiol29$3,016$104
Progesterone14$228$16

Year by year

Part D prescribing by year
20248127None26%$13,613
202376320% (0)None$15,841
20228133None43%$17,568
202110438None38%$25,744
20208027None39%$19,781
20199631None46%$23,395
2018126430% (0)37%$28,880
201711748None41%$25,580
201611341None45%$21,238
20158936None63%$17,141
20149333None74%$15,158
201310934None74%$18,285

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

See the drugs prescribed each year

2023: 2 drugs

Part D drugs prescribed in 2023
Premarin18$8,171$454
Estradiol24$3,177$132

2022: 2 drugs

Part D drugs prescribed in 2022
Premarin23$9,907$431
Estradiol23$2,890$126

2021: 3 drugs

Part D drugs prescribed in 2021
Premarin20$9,608$480
Estring18$8,558$475
Estradiol38$6,085$160

2020: 3 drugs

Part D drugs prescribed in 2020
Estring14$6,384$456
Premarin15$5,767$384
Estradiol24$4,511$188

2019: 3 drugs

Part D drugs prescribed in 2019
Premarin23$6,438$280
Estradiol14$2,331$167
Medroxyprogesterone Acetate11$63$6

2018: 5 drugs

Part D drugs prescribed in 2018
Premarin21$7,295$347
Estring13$5,267$405
Estrace11$4,791$436
Estradiol18$3,621$201
Yuvafem11$2,933$267

2017: 3 drugs

Part D drugs prescribed in 2017
Estrace18$6,946$386
Premarin22$6,107$278
Estring12$4,557$380

2016: 4 drugs

Part D drugs prescribed in 2016
Estrace19$5,040$265
Vagifem11$4,186$381
Premarin14$4,074$291
Estring11$3,437$312

2015: 2 drugs

Part D drugs prescribed in 2015
Premarin21$6,003$286
Estring12$3,107$259

2014: 3 drugs

Part D drugs prescribed in 2014
Premarin23$5,220$227
Estring13$2,883$222
Vagifem14$2,427$173

2013: 3 drugs

Part D drugs prescribed in 2013
Premarin25$4,616$185
Estrace13$2,147$165
Vagifem21$1,819$87

Professional record

NPI
1689741811
Licence
CA A60887California A60887: Current · expires 2028-02-29
Trained
Emory University School of Medicine, 1995
Gender
Female
More record details
Sole proprietor
No
Taxonomy
Federal specialty code 207V00000X (207V00000X)
Mailing address
325 Distel Cir, Los Altos, CA, 94022
NPI first listed
2006-11-30
NPI last updated
2020-03-04
NPI record certified
2020-03-04

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