Caitlin Alonzo, - Nurse Practitioner in O Fallon, IL

Caitlin Alonzo, is a Nurse Practitioner - Family based in O Fallon, Illinois. Caitlin Alonzo is licensed to practice in Missouri (license number 2025008810) and her current practice location is 1 Saint Elizabeth Blvd, O Fallon, Illinois. She can be reached at her office (for appointments etc.) via phone at (618) 234-2120.

NPI number for Caitlin Alonzo is 1083576243 and her current mailing address is 212 Harbor Vw, Fenton, Missouri. She does not participate in medicare program and thus does not accept medicare assignments. Her NPI Number is 1083576243.

Contact Information

Caitlin Alonzo,
1 Saint Elizabeth Blvd,
O Fallon, IL 62269-1099
(618) 234-2120
Not Available

Map and Direction




Provider's Profile

Full NameCaitlin Alonzo
GenderFemale
SpecialityNurse Practitioner - Family
Location1 Saint Elizabeth Blvd, O Fallon, Illinois
Accepts Medicare AssignmentsDoes not participate in Medicare Program. She may not accept medicare assignment.
  NPI Data:
  • NPI Number: 1083576243
  • Provider Enumeration Date: 11/26/2025
  • Last Update Date: 11/26/2025

Medical Identifiers

Medical identifiers for Caitlin Alonzo such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1083576243NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
363LF0000XNurse Practitioner - Family 2025008810 (Missouri)Primary

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Caitlin Alonzo is NOT enrolled with medicare and thus cannot prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Caitlin Alonzo,
212 Harbor Vw,
Fenton, MO 63026-7515

Ph: () -
Caitlin Alonzo,
1 Saint Elizabeth Blvd,
O Fallon, IL 62269-1099

Ph: (618) 234-2120

Reviews and Comments


Nurse Practitioner Nurses in O Fallon, IL

Kathy Liefer, NURSE PRACTITIONER
Nurse Practitioner
Medicare: Accepting Medicare Assignments
Practice Location: 3 Saint Elizabeth Blvd, O Fallon, IL 62269
Phone: 618-641-5803    
Annamaria Griffith, DNP, FNP-C
Nurse Practitioner
Medicare: Medicare Enrolled
Practice Location: 1405 N Green Mount Rd Ste 240, O Fallon, IL 62269
Phone: 618-632-9000    
Ms. Shambra Cullum, APN
Nurse Practitioner
Medicare: Medicare Enrolled
Practice Location: 1 Saint Elizabeth Blvd, O Fallon, IL 62269
Phone: 217-994-1485    
Mrs. Amy Marie Buck, APN
Nurse Practitioner
Medicare: Accepting Medicare Assignments
Practice Location: 670 Pierce Blvd, O Fallon, IL 62269
Phone: 618-206-2070    
Sarah Jane Brashear, FNP-C
Nurse Practitioner
Medicare: Not Enrolled in Medicare
Practice Location: 320 E Highway 50, O Fallon, IL 62269
Phone: 888-577-6337    
Derek Pechacek, FNP-C
Nurse Practitioner
Medicare: Accepting Medicare Assignments
Practice Location: 320 E Highway 50, O Fallon, IL 62269
Phone: 618-624-3368    Fax: 618-624-3387

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.