Dr. Yoojin Koh, MD
- Part D claims, 2024
- 130
- Hospital affiliations
- 1
- Industry payments
- $25
- Medical group
- 1
- Insurance carriers
- 2
- Practice address
- 975 Sereno Dr, Vallejo, CA 94589
- Practice phone
- Call (707) 651-1000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Koh's professional email, personal email and mobile number
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Dr. Yoojin Koh is an OB-GYN in Vallejo, California
Dr. Koh practices at Vallejo Medical Center in Vallejo, California, part of Kaiser Permanente.
Dr. Koh's NPI, 1366520173, was assigned on November 1, 2006. Dr. Koh graduated from Ohio State College of Medicine in 2001. Dr. Koh holds California license A82797.
- NPI
- 1366520173NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2567478662
- NPI enumeration date
- November 1, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (707) 651-1000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 51
- Medical school graduation
- 2001
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Yoojin Koh practices at Vallejo Medical Center in Vallejo, California
Dr. Koh's primary practice is Vallejo Medical Center, at 975 Sereno Dr, Vallejo, CA 94589 in Solano County. The practice phone is (707) 651-1000.
- Vallejo Medical Center975 Sereno Dr, Vallejo, CA 94589 · Solano CountyPhone(707) 651-1000
Source: Dmand AI Affiliation Data
Dr. Yoojin Koh is affiliated with 3 sites of care and 1 medical group
Dr. Koh's primary practice is Vallejo Medical Center in Vallejo, California, part of Kaiser Permanente. The medical group on file is The Permanente Medical Group, Inc. Dmand AI also links Dr. Koh to 1 more home health agency and 1 hospice, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Yoojin Koh's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Koh practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Vallejo Medical Center | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Yoojin Koh is one of 4,642 OB-GYNs in California
Obstetrics and gynecology is Dr. Koh's primary specialty in the NPI Registry, under taxonomy code 207V00000X. Dr. Koh is board certified in obstetrics & gynecology by the American Board of Obstetrics and Gynecology. Dr. Koh is licensed in California.
Specialties and state licenses
- Obstetrics and gynecology, CaliforniaPrimary
Clinical focus
Dmand AI lists menopause and vaginal infection among the conditions Dr. Koh treats.
OB-GYNs near Dr. Koh
Counts of OB-GYNs with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Yoojin Koh's patients have a median age of 35
Across all payers, Dmand AI patient panel data puts Dr. Koh's median patient age at 35, with 99% women.
Dr. Koh's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 35
Patient panel by sex, all payers
- Women99%
- Men0%
Source: Dmand AI Patient Panel Data
Dr. Yoojin Koh wrote 130 Medicare Part D claims in 2024
In 2024, Dr. Koh wrote 130 Medicare Part D claims for 70 patients. 82% of them were for generic drugs. CMS names the drug for 60 of them, across 3 drugs with 11 or more claims each, at $11,207 in total drug cost. In 2023, CMS named 41 claims across 2 drugs.
Dr. Koh's Part D claims by kind of drug, 2024
- Generic106 claims82%
- Brand-name24 claims18%
Dr. Koh's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 412024: 6046%
Drugs named by CMS: 3 in 2024, 2 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Yoojin Koh takes part in Medicare
Dr. Koh accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Yoojin Koh received $25 in industry payments in 2023
CMS Open Payments shows 1 general payment to Dr. Koh from 1 drug or device company in 2023. Consulting fees make up the largest share, 100% of the total. CooperSurgical, Inc. paid the most, $25.
Companies that paid Dr. Koh the most, 2023 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Yoojin Koh has 2 awards and honors on record
Dmand AI lists 2 awards for Dr. Koh, most recently CMS Stage 1 2012 in 2011.
Awards and honors for Dr. Koh
- 2011
- CMS Stage 1 2012
- Undated
- ACOG Fellow
Source: Dmand AI Professional Profile Data
Dr. Yoojin Koh graduated from Ohio State College of Medicine
Dr. Koh graduated from Ohio State College of Medicine in 2001.
- Medical school
- Board certified in obstetrics & gynecology
Source: Dmand AI Professional Profile Data
Dr. Yoojin Koh accepts plans from 2 insurance carriers
Dr. Koh is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
- Kaiser Permanente
- CMS Medicare
Plan types Dr. Koh accepts, by number of carriers
- EPO1
- HMO1
- Medicare1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Yoojin Koh's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Yoojin Koh
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Yoojin Koh's NPI number?
Dr. Yoojin Koh's NPI number is 1366520173. It was assigned on November 1, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Yoojin Koh?
Dr. Yoojin Koh is an OB-GYN in Vallejo, California. The primary specialty in the NPI Registry is Obstetrics & Gynecology Physician (taxonomy code 207V00000X).
Where does Dr. Yoojin Koh practice?
Dr. Koh practices at 975 Sereno Dr, Vallejo, CA 94589. Dr. Koh's primary practice is Vallejo Medical Center in Vallejo, California, part of Kaiser Permanente. Dmand AI also links Dr. Koh to 1 home health agency and 1 hospice.
What is Dr. Yoojin Koh's office phone number?
The practice phone on file for Dr. Koh is (707) 651-1000.
What is Dr. Yoojin Koh's medical license number?
Dr. Koh holds California license A82797.
Which hospitals is Dr. Yoojin Koh affiliated with?
Dr. Koh practices at Vallejo Medical Center in Vallejo, California.
What medical group is Dr. Yoojin Koh part of?
Dr. Koh is linked to The Permanente Medical Group, Inc.
Does Dr. Yoojin Koh accept Medicare?
Yes. CMS lists Dr. Koh as accepting Medicare assignment.
Is Dr. Yoojin Koh board certified?
Yes. Dr. Koh is board certified in obstetrics & gynecology by the American Board of Obstetrics and Gynecology.
Where did Dr. Yoojin Koh go to medical school?
Dr. Koh graduated from Ohio State College of Medicine in 2001.
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What drugs does Dr. Yoojin Koh prescribe most?
In 2024 Medicare Part D data, Dr. Koh's most prescribed drugs by claims were Estradiol, Estring and Hydrocortisone.
Has Dr. Yoojin Koh received payments from drug or device companies?
CMS Open Payments shows $25 in general payments to Dr. Koh from 1 company from 2023 to 2023. The largest total came from CooperSurgical, Inc.
How long has Dr. Yoojin Koh been practicing?
Dr. Koh graduated from medical school in 2001, 25 years ago.
What insurance does Dr. Yoojin Koh accept?
Dr. Koh is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
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