Caitlin Alonzo
- Hospital affiliations
- 2
- Medical group
- 1
- State licenses
- 2
- Year NPI issued
- 2025
- Practice address
- 1 St Elizabeth Blvd, O'Fallon, IL 62269
- Practice phone
- Call (217) 492-9651
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
HSHS St. Elizabeth's Hospital
O'Fallon, Illinois
Find Caitlin Alonzo'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.
Caitlin Alonzo is a nurse practitioner in O'Fallon, Illinois
Caitlin Alonzo practices at HSHS St. Elizabeth's Hospital in O'Fallon, Illinois.
Caitlin Alonzo's NPI, 1083576243, was assigned on November 26, 2025. Caitlin Alonzo holds Illinois license 209034125.
- NPI
- 1083576243NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9638652118
- NPI enumeration date
- November 26, 2025
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (217) 492-9651
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 34
- Medical school graduation
- 2018
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Caitlin Alonzo practices at HSHS St. Elizabeth's Hospital in O'Fallon, Illinois
Caitlin Alonzo's primary practice is HSHS St. Elizabeth's Hospital, at 1 St Elizabeth Blvd, O'Fallon, IL 62269 in Saint Clair County. The practice phone is (217) 492-9651.
- HSHS St. Elizabeth's Hospital1 St Elizabeth Blvd, O'Fallon, IL 62269 · Saint Clair CountyPhone(217) 492-9651
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Caitlin Alonzo is affiliated with 3 sites of care and 1 medical group
Caitlin Alonzo's primary practice is HSHS St. Elizabeth's Hospital in O'Fallon, Illinois. Caitlin Alonzo is also affiliated with HSHS St. Elizabeth's Hospital. The medical group on file is Vituity (formerly CEP America). Dmand AI also links Caitlin Alonzo to 1 more hospital, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Caitlin Alonzo's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Caitlin Alonzo practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| HSHS St. Elizabeth's Hospital | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Caitlin Alonzo is one of 4,254 nurse practitioners in Illinois
Nurse practitioner is Caitlin Alonzo's primary specialty in the NPI Registry, under taxonomy code 363L00000X. Dmand AI has Caitlin Alonzo's licenses on file in 2 states: Illinois and Missouri.
Specialties and state licenses
- Nurse practitioner, IllinoisPrimary
- Family nurse practitioner, Missouri
Nurse practitioners near Caitlin Alonzo
Counts of 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
Caitlin Alonzo's patients have a median age of 44
Across all payers, Dmand AI patient panel data puts Caitlin Alonzo's median patient age at 44, with 33% women.
Caitlin Alonzo's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 44
Patient panel by sex, all payers
- Women33%
- Men67%
Source: Dmand AI Patient Panel Data
How Caitlin Alonzo takes part in Medicare
Caitlin Alonzo 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)
Sources for Caitlin Alonzo'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 DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (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 Caitlin Alonzo
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Caitlin Alonzo's NPI number?
Caitlin Alonzo's NPI number is 1083576243. It was assigned on November 26, 2025, and it is active in the NPI Registry.
What does Caitlin Alonzo specialize in?
Caitlin Alonzo is a nurse practitioner in O'Fallon, Illinois. The primary specialty in the NPI Registry is Nurse Practitioner (taxonomy code 363L00000X).
Where does Caitlin Alonzo practice?
Caitlin Alonzo practices at 1 St Elizabeth Blvd, O'Fallon, IL 62269. Caitlin Alonzo's primary practice is HSHS St. Elizabeth's Hospital in O'Fallon, Illinois. Dmand AI also links Caitlin Alonzo to 1 hospital.
What is Caitlin Alonzo's office phone number?
The practice phone on file for Caitlin Alonzo is (217) 492-9651.
What is Caitlin Alonzo's medical license number?
Caitlin Alonzo holds Illinois license 209034125, one of the licenses on file in 2 states.
Which states has Caitlin Alonzo been licensed in?
Dmand AI has state licenses on file for Caitlin Alonzo in Illinois and Missouri.
Which hospitals is Caitlin Alonzo affiliated with?
Caitlin Alonzo is affiliated with HSHS St. Elizabeth's Hospital. Dmand AI links Caitlin Alonzo to 1 more hospital.
What medical group is Caitlin Alonzo part of?
Caitlin Alonzo is linked to Vituity (formerly CEP America).
Does Caitlin Alonzo accept Medicare?
Yes. CMS lists Caitlin Alonzo as accepting Medicare assignment.
How long has Caitlin Alonzo been practicing?
Caitlin Alonzo graduated from medical school in 2018, 8 years ago.
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