1. Home
  2. Directory
  3. Illinois
  4. O Fallon
  5. Nurse Practitioner
  6. NPI Profile

ALLISON N SMITH MSN, PMHNP-BC
NPI 1821805011
Nurse Practitioner - Psychiatric/Mental Health in O Fallon, IL

Active since December 12, 2024PECOS EnrolledAccepts Medicare Assignment
791 WALL ST, O FALLON, IL 62269(283) 223-7997(618) 206-6451 Get Directions Write a Review

NPPES record last updated: August 13, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Aug 13, 2026, May 12, 2026, Dec 12, 2024 (3 updates tracked since 2024).

About Allison N Smith Msn, Pmhnp-bc NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

ALLISON N SMITH MSN, PMHNP-BC (NPI 1821805011) is an individual psychiatric/mental health provider in O Fallon, Illinois, licensed in Illinois (209031884) and active in the NPI registry since December 2024. She is enrolled in Medicare PECOS and is a graduate of Other (2024).

NPPES Registry Identity

NPI1821805011
Entity TypeIndividualFemale
Primary Taxonomy363LP0808X
Provider Legal NameALLISON N SMITHCredential: MSN, PMHNP-BC
Location Address791 WALL STO Fallon, IL 62269-2087
Mailing Address1021 Thornbury PlO Fallon, IL 62269-6812 · (618) 795-8087 · Fax (618) 206-6451
Phone(283) 223-7997
Fax(618) 206-6451
Sole ProprietorYes
Medical School CMSOtherGraduated 2024
Enumeration DateDecember 12, 2024
Last NPPES UpdateAugust 13, 20263 updates tracked since enumeration
NPPES CertifiedAugust 13, 2026
✔ NPI 1821805011 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNurse Practitioner · Psychiatric/Mental HealthPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363LP0808X
Licenses✔ Licensed in IL · 209031884✔ Licensed in MO · 2024042847
791 WALL ST, O Fallon, IL 62269
Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Medica, Oscar Health, Oscar Insurance Company and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Allison N Smith Msn, Pmhnp-bc is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID5597287532
PECOS Enrollment IDI20250319000822
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Allison Smith reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

St. Louis Behavioral Medicine Institute Inc
19 mi
Psychologist
1129 MACKLIND AVE
Saint Louis, MO 63110
  • Reassigned Medicare billing, Missouri enrollment
  • 82 clinicians in this Medicare group
NPI 1487732335 (314) 534-0200

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 62269 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$88.44 typical visit price
range $56.28 – $173.35
Typical copayment $22.11 (range $14.07 – $43.33)
Most-billed visit code 99203
Established Patient
$99.71 typical visit price
range $17.51 – $139.99
Typical copayment $24.92 (range $4.37 – $34.99)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 4

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MORGAN & SCHENCK MENTAL HEALTH AND WELLNESS ASSOCIATES
Social Worker (Clinical)
791 WALL ST
O FALLON, IL 62269
St. Clair County (283) 223-7997
ILLINOIS MENTOR
Foster Care Agency
791 WALL ST
O FALLON, IL 62269
St. Clair County (618) 628-9424
RACHEL MORGAN LCSW
Social Worker (Clinical)
791 WALL ST
O FALLON, IL 62269
St. Clair County (283) 223-7997
LYNN SEWESTER UNDERWOOD MA, LCPC
Counselor (Professional)
791 WALL ST
O FALLON, IL 62269
St. Clair County (618) 514-1154

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Allison Smith's NPI number?

The NPI number for Allison Smith is 1821805011. It was assigned to this individual provider in the NPPES registry on December 12, 2024.

Where is Allison Smith located?

Allison Smith practices at 791 Wall St, O Fallon, IL 62269. The listed phone number is (283) 223-7997.

What is Allison Smith's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Psychiatric/Mental Health, with taxonomy code 363LP0808X.

Is Allison Smith enrolled in Medicare?

Yes. Allison Smith is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Allison Smith's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Allison Smith reassigns Medicare benefits to St. Louis Behavioral Medicine Institute Inc (Saint Louis, MO). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Allison Smith's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Allison Smith accept?

Health plans from Medica, Oscar Health, Oscar Insurance Company and UnitedHealthcare list Allison Smith as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Allison Smith was last updated on August 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.