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THERESA A LARSON
NPI 1942040472
Nurse Practitioner - Psychiatric/Mental Health in Deerfield, IL

Active since May 31, 2024PECOS Enrolled
440 LAKE COOK RD STE 2, DEERFIELD, IL 60015(847) 236-9310(847) 236-9411 Get Directions Write a Review

NPPES record last updated: May 31, 2024. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Theresa A Larson NPPES

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

THERESA A LARSON (NPI 1942040472) is an individual psychiatric/mental health provider in Deerfield, Illinois, licensed in Illinois (209.029761) and active in the NPI registry since May 2024. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1942040472
Entity TypeIndividualFemale
Primary Taxonomy363LP0808X
Provider Legal NameTHERESA A LARSON
Location Address440 LAKE COOK RD STE 2Deerfield, IL 60015-5263
Mailing Address440 Lake Cook Rd Ste 2Deerfield, IL 60015-5263 · (847) 236-9310 · Fax (847) 236-9411
Phone(847) 236-9310
Fax(847) 236-9411
Sole ProprietorNo
Enumeration DateMay 31, 2024
NPPES CertifiedMay 30, 2024
✔ NPI 1942040472 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
License✔ Licensed in IL · 209.029761
440 LAKE COOK RD STE 2, Deerfield, IL 60015
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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Theresa A Larson is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 Theresa Larson reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Rodasi LLC
17 mi
Mental Health
2500 W HIGGINS RD STE 105
Hoffman Estates, IL 60169
  • Reassigned Medicare billing, Illinois enrollment
  • 50 clinicians in this Medicare group
NPI 1467691790 (888) 870-1775

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 60015 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
$93.02 typical visit price
range $59.81 – $181.38
Typical copayment $23.25 (range $14.95 – $45.34)
Most-billed visit code 99203
Established Patient
$105.07 typical visit price
range $19.15 – $147.12
Typical copayment $26.26 (range $4.78 – $36.78)
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 2

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

NASHAAT N BOUTROS MD
Psychiatry & Neurology (Psychiatry)
440 LAKE COOK RD STE 2
DEERFIELD, IL 60015
Lake County (847) 945-6463
ALLISON MARIE OLIVER PA-C
Physician Assistant
440 LAKE COOK RD STE 2
DEERFIELD, IL 60015
Lake County (630) 246-0812

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 Theresa Larson's NPI number?

The NPI number for Theresa Larson is 1942040472. It was assigned to this individual provider in the NPPES registry on May 31, 2024.

Where is Theresa Larson located?

Theresa Larson practices at 440 Lake Cook Rd Ste 2, Deerfield, IL 60015. The listed phone number is (847) 236-9310.

What is Theresa Larson's specialty?

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

Is Theresa Larson enrolled in Medicare?

Yes. Theresa Larson is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Theresa Larson's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Theresa Larson reassigns Medicare benefits to Rodasi LLC (Hoffman Estates, IL). 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 Theresa Larson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Theresa Larson was last updated on May 31, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years 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.