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Katharine A Willoughby, MD

Obstetrics/Gynecology · Santa Clara

NPI 1053643684

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 · Permanente Medical Group Inc · 10,928 clinicians in this group

Looking this up.

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. Willoughby’s office at (408) 851-1000 to ask if they take your plan before you enroll.

California Medical Board record

Licence A110248 · Current

Licensed to practise in California · since 2009 · expires 2027-05-31 · University of California, Davis School of Medicine.

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

Medicaid work

$7,715 in 2024

Medicaid paid $7,715 for 345 billed services this clinician did in 2024, up to 26 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
Short return visit (20+ min)212$7,715
TOBACCO NON-USER133$0
Medicaid work by year
2024345226$7,715
2023223221$674
2022249132$530
2021177120$183
202047215$100
2019115120$0
2018150121$71
See the largest Medicaid services in earlier years

2023

Largest Medicaid services in 2023
Short return visit (20+ min)209$674
TOBACCO NON-USER14$0

2022

Largest Medicaid services in 2022
Short return visit (20+ min)249$530

2021

Largest Medicaid services in 2021
Short return visit (20+ min)177$183

2020

Largest Medicaid services in 2020
Short return visit (20+ min)14$60
Short return visit33$39

2019

Largest Medicaid services in 2019
Short return visit115$0

2018

Largest Medicaid services in 2018
Short return visit150$71

Drugs they prescribed that Part D paid

$10,666

Pharmacies billed $10,666 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 135) in 2024. At or below the middle of the specialty; the typical obstetrics & gynecology clinician is at 0%.

111 generic and 24 brand-name prescriptions · $10,666 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
Estradiol42$1,903$45
Trospium Chloride13$828$64

Year by year

Part D prescribing by year
2024135900% (0)18%$10,666
2023155840% (0)8%$9,019
2022148800% (0)None$8,934
2021131770% (0)15%$7,058
202092570% (0)15%$4,325
201984530% (0)23%$7,175
20189859None37%$8,701
201764350% (0)20%$5,454
201613962None30%$10,808
20158444None30%$6,316
20149248None22%$5,250
201311248None23%$5,278

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
Estradiol43$1,863$43
Trospium Chloride15$1,038$69
Betamethasone Diprop Augmented14$693$49
Fluconazole26$160$6

2022: 3 drugs

Part D drugs prescribed in 2022
Estradiol31$1,403$45
Trospium Chloride14$953$68
Fluconazole23$164$7

2021: 3 drugs

Part D drugs prescribed in 2021
Estradiol33$1,703$52
Trospium Chloride14$982$70
Fluconazole19$152$8

2020: 2 drugs

Part D drugs prescribed in 2020
Estradiol24$1,077$45
Fluconazole12$94$8

2019: 1 drug

Part D drugs prescribed in 2019
Estradiol26$1,264$49

2018: 2 drugs

Part D drugs prescribed in 2018
Estrace18$2,016$112
Fluconazole18$166$9

2017: 1 drug

Part D drugs prescribed in 2017
Fluconazole18$178$10

2016: 2 drugs

Part D drugs prescribed in 2016
Estradiol16$325$20
Fluconazole26$324$12

2015: 1 drug

Part D drugs prescribed in 2015
Fluconazole15$149$10

2014: 1 drug

Part D drugs prescribed in 2014
Fluconazole14$144$10

2013: 1 drug

Part D drugs prescribed in 2013
Fluconazole15$102$7

Professional record

NPI
1053643684
Licence
CA A110248California A110248: Current · expires 2027-05-31
Trained
University of California, Davis School of Medicine, 2008
Gender
Female
More record details
Sole proprietor
No
Taxonomy
Federal specialty code 207V00000X (207V00000X)
Mailing address
300 Pasteur Dr, Rm Hh333, Stanford, CA, 94305
NPI first listed
2010-02-07
NPI last updated
2021-12-15

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

This office lists an electronic records connection.