Allison Williamson, CPNP
- Hospital affiliations
- 1
- Industry payments
- $21
- Medical groups
- 3
- State license
- 1
- Year NPI issued
- 2015
- Practice address
- 6420 Clayton Rd, Saint Louis, MO 63117
- Practice phone
- Call (314) 768-8000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Allison 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.
Allison Williamson is a pediatric nurse practitioner in Saint Louis, Missouri
Allison Williamson practices at SSM Health St. Mary's Hospital - St. Louis in Saint Louis, Missouri, part of SSM Health Care.
Allison Williamson's NPI, 1114390663, was assigned on November 5, 2015. Allison Williamson holds Missouri license 2015015186.
- NPI
- 1114390663NPI Registry (opens in a new tab)
- NPI enumeration date
- November 5, 2015
- NPI status
- Active
- Practice phone
- (314) 768-8000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Allison Williamson practices at SSM Health St. Mary's Hospital - St. Louis in Saint Louis, Missouri
Allison Williamson's primary practice is SSM Health St. Mary's Hospital - St. Louis, at 6420 Clayton Rd, Saint Louis, MO 63117 in St. Louis County. The practice phone is (314) 768-8000.
- SSM Health St. Mary's Hospital - St. Louis6420 Clayton Rd, Saint Louis, MO 63117 · St. Louis CountyPhone(314) 768-8000
Source: Dmand AI Affiliation Data
Allison Williamson is affiliated with 1 site of care and 3 medical groups
Allison Williamson's primary practice is SSM Health St. Mary's Hospital - St. Louis in Saint Louis, Missouri, part of SSM Health Care. The medical group on file is SSM Health Medical Group. Dmand AI also links Allison Williamson to 2 more medical groups, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Allison Williamson's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Allison Williamson practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| SSM Health St. Mary's Hospital - St. Louis | Available with a free account |
| +2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Allison Williamson is one of 516 pediatric nurse practitioners in Missouri
Nurse practitioner is Allison Williamson's primary specialty in the NPI Registry, under taxonomy code 363LP0200X. The record also lists pediatrics. Allison Williamson is licensed in Missouri.
Specialties and state licenses
- Pediatric nurse practitioner, MissouriPrimary
Pediatric nurse practitioners near Allison Williamson
Counts of pediatric nurse practitioners 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
Allison Williamson's patients have a median age of 8
Across all payers, Dmand AI patient panel data puts Allison Williamson's median patient age at 8, with 51% women.
Allison 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 8
Patient panel by sex, all payers
- Women51%
- Men49%
Source: Dmand AI Patient Panel Data
Allison Williamson received $21 in industry payments in 2025
CMS Open Payments shows 1 general payment to Allison Williamson from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Exact Sciences Corporation paid the most, $21.
Companies that paid Allison Williamson the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Allison 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 | 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 |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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 Allison 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 Allison Williamson's NPI number?
Allison Williamson's NPI number is 1114390663. It was assigned on November 5, 2015, and it is active in the NPI Registry.
What does Allison Williamson specialize in?
Allison Williamson is a pediatric nurse practitioner in Saint Louis, Missouri. The primary specialty in the NPI Registry is Pediatric Nurse Practitioner (taxonomy code 363LP0200X).
Where does Allison Williamson practice?
Allison Williamson practices at 6420 Clayton Rd, Saint Louis, MO 63117. Allison Williamson's primary practice is SSM Health St. Mary's Hospital - St. Louis in Saint Louis, Missouri, part of SSM Health Care. Dmand AI also links Allison Williamson to 2 medical groups.
What is Allison Williamson's office phone number?
The practice phone on file for Allison Williamson is (314) 768-8000.
What is Allison Williamson's medical license number?
Allison Williamson holds Missouri license 2015015186.
Which hospitals is Allison Williamson affiliated with?
Allison Williamson practices at SSM Health St. Mary's Hospital - St. Louis in Saint Louis, Missouri.
What medical group is Allison Williamson part of?
Allison Williamson is linked to SSM Health Medical Group. Dmand AI links Allison Williamson to 2 more medical groups.
Has Allison Williamson received payments from drug or device companies?
CMS Open Payments shows $21 in general payments to Allison Williamson from 1 company from 2025 to 2025. The largest total came from Exact Sciences Corporation.
How long has Allison Williamson been practicing?
Allison Williamson's NPI was assigned in 2015.
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