Dr. Katherine Danielle Williamson, MD
- Industry payments
- $1,040
- Affiliated sites
- 1
- Medical group
- 1
- Insurance carriers
- 7
- State license
- 1
- Practice address
- 777 Corporate Dr, Ladera Ranch, CA 92694
- Practice phone
- Call (714) 509-8649
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Choc Children's Specialists
Ladera Ranch, California
Find Dr. Williamson's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Katherine Danielle Williamson is a pediatrician in Ladera Ranch, California
Dr. Williamson practices at Choc Children's Specialists in Ladera Ranch, California.
Dr. Williamson's NPI, 1982916375, was assigned on July 14, 2010. Dr. Williamson graduated from UCSF School of Medicine in 2008. Dr. Williamson holds California license A112985.
- NPI
- 1982916375NPI Registry (opens in a new tab)
- NPI enumeration date
- July 14, 2010
- NPI status
- Active
- Practice phone
- (714) 509-8649
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Medical school graduation
- 2008
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. Katherine Danielle Williamson practices at Choc Children's Specialists in Ladera Ranch, California
Dr. Williamson's primary practice is Choc Children's Specialists, at 777 Corporate Dr, Ladera Ranch, CA 92694 in Orange County. The practice phone is (714) 509-8649.
- Choc Children's Specialists777 Corporate Dr, Ladera Ranch, CA 92694 · Orange CountyPhone(714) 509-8649
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Katherine Danielle Williamson is affiliated with 2 sites of care and 1 medical group
Dr. Williamson's primary practice is Choc Children's Specialists in Ladera Ranch, California. The medical group on file is CHOC Children's. Dmand AI also links Dr. Williamson to 1 more group practice or clinic, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Katherine Danielle Williamson's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Williamson practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Choc Children's Specialists | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Katherine Danielle Williamson is one of 8,236 pediatricians in California
Pediatrics is Dr. Williamson's primary specialty in the NPI Registry, under taxonomy code 208000000X. Dr. Williamson is board certified in pediatrics by the American Board of Pediatrics. Dr. Williamson is licensed in California.
Specialties and state licenses
- Pediatrics, CaliforniaPrimary
Pediatricians near Dr. Williamson
Counts of pediatricians 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. Katherine Danielle Williamson's patients have a median age of 11
Across all payers, Dmand AI patient panel data puts Dr. Williamson's median patient age at 11, with 63% women.
Dr. Williamson's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 11
Patient panel by sex, all payers
- Women63%
- Men36%
Source: Dmand AI Patient Panel Data
Dr. Katherine Danielle Williamson received $1,040 in industry payments from 2024 to 2025
CMS Open Payments shows 45 general payments to Dr. Williamson from 18 drug and device companies from 2024 to 2025. Food and beverage make up the largest share, 100% of the total. Ironshore Pharmaceuticals Inc. paid the most, $112.
General payments to Dr. Williamson by program year, 2024 to 2025
Companies that paid Dr. Williamson the most, 2024 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Katherine Danielle Williamson graduated from UCSF School of Medicine
Dr. Williamson graduated from UCSF School of Medicine in 2008.
- Medical school
- Board certified in pediatrics
Source: Dmand AI Professional Profile Data
Dr. Katherine Danielle Williamson accepts plans from 7 insurance carriers
Dr. Williamson is in network with 7 carriers, including Elevance, Aetna and United Healthcare. POS plans come from the most carriers, 5. Check the plan with the practice before a visit.
- Elevance
- Aetna
- United Healthcare
- Blue Cross Blue Shield of Michigan
- Aspirus Health Plan
- Blue Cross and Blue Shield of Kansas City
- HCSC
Plan types Dr. Williamson accepts, by number of carriers
- POS5
- PPO5
- HMO4
- EPO3
- Medicare2
Source: Dmand AI Insurance Network Data
Sources for Dr. Katherine Danielle Williamson'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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. Katherine Danielle Williamson
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. Katherine Danielle Williamson's NPI number?
Dr. Katherine Danielle Williamson's NPI number is 1982916375. It was assigned on July 14, 2010, and it is active in the NPI Registry.
What kind of doctor is Dr. Katherine Danielle Williamson?
Dr. Katherine Danielle Williamson is a pediatrician in Ladera Ranch, California. The primary specialty in the NPI Registry is Pediatrics Physician (taxonomy code 208000000X).
Where does Dr. Katherine Danielle Williamson practice?
Dr. Williamson practices at 777 Corporate Dr, Ladera Ranch, CA 92694. Dr. Williamson's primary practice is Choc Children's Specialists in Ladera Ranch, California. Dmand AI also links Dr. Williamson to 1 group practice or clinic.
What is Dr. Katherine Danielle Williamson's office phone number?
The practice phone on file for Dr. Williamson is (714) 509-8649.
What is Dr. Katherine Danielle Williamson's medical license number?
Dr. Williamson holds California license A112985.
What medical group is Dr. Katherine Danielle Williamson part of?
Dr. Williamson is linked to CHOC Children's.
Is Dr. Katherine Danielle Williamson board certified?
Yes. Dr. Williamson is board certified in pediatrics by the American Board of Pediatrics.
Where did Dr. Katherine Danielle Williamson go to medical school?
Dr. Williamson graduated from UCSF School of Medicine in 2008.
Has Dr. Katherine Danielle Williamson received payments from drug or device companies?
CMS Open Payments shows $1,040 in general payments to Dr. Williamson from 18 companies from 2024 to 2025. The largest total came from Ironshore Pharmaceuticals Inc.
How long has Dr. Katherine Danielle Williamson been practicing?
Dr. Williamson graduated from medical school in 2008, 18 years ago.
What insurance does Dr. Katherine Danielle Williamson accept?
Dr. Williamson is in network with 7 carriers, including Elevance, Aetna and United Healthcare. POS plans come from the most carriers, 5. Check the plan with the practice before a visit.
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