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MS. MICHELLE DIANE HORWITZ LCSW
NPI 1952279549
Social Worker - Clinical in Saint Louis, MO

Active since October 27, 2025PECOS Enrolled
4444 FOREST PARK AVE, STE 2600, SAINT LOUIS, MO 63108(314) 286-1700(314) 362-7017 Get Directions Write a Review

NPPES record last updated: December 29, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Ms. Michelle Diane Horwitz Lcsw NPPES

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

MS. MICHELLE DIANE HORWITZ LCSW (NPI 1952279549) is an individual clinical provider in Saint Louis, Missouri, licensed in Missouri (2021019683) and active in the NPI registry since October 2025. She is enrolled in Medicare PECOS and is a graduate of George Washington University School Of Medicine (2017).

NPPES Registry Identity

NPI1952279549
Entity TypeIndividualFemale
Primary Taxonomy1041C0700X
Provider Legal NameMS. MICHELLE DIANE HORWITZCredential: LCSW
Location Address4444 FOREST PARK AVE, STE 2600Saint Louis, MO 63108-2212
Mailing AddressPo Box 7412011Chicago, IL 60674-2011 · (314) 286-1700 · Fax (314) 362-7017
Phone(314) 286-1700
Fax(314) 362-7017
Sole ProprietorNo
Medical School CMSGeorge Washington University School Of MedicineGraduated 2017
Enumeration DateOctober 27, 2025
Last NPPES UpdateDecember 29, 2025
NPPES CertifiedOctober 27, 2025
✔ NPI 1952279549 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySocial Worker · ClinicalBehavioral Health & Social Service Providers
Taxonomy Code1041C0700X
License✔ Licensed in MO · 2021019683
Definition
A social worker who holds a master's or doctoral degree in social work from an accredited school of social work in addition to at least two years of post-master's supervised experience in a clinical setting. The social worker must be licensed, certified, or registered at the clinical level in the jurisdiction of practice. A clinical social worker provides direct services, including interventions focused on interpersonal interactions, intrapsychic dynamics, and life management issues. Clinical social work services are based on bio-psychosocial perspectives. Services consist of assessment, diagnosis, treatment (including psychotherapy and counseling), client-centered advocacy, consultation, evaluation, and prevention of mental illness, emotional, or behavioral disturbances.
4444 FOREST PARK AVE, Saint Louis, MO 63108
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Insurance Company.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Ms. Michelle Diane Horwitz Lcsw is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID3375014558
PECOS Enrollment IDI20260609000960
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 Michelle Horwitz reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Washington University
0.5 mi
Multi-Specialty
660 S EUCLID AVE
Saint Louis, MO 63110
  • Reassigned Medicare billing, Missouri enrollment
  • 148 clinicians in this Medicare group
NPI 1003856592 (314) 362-5184

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 63108 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
$0.00 typical visit price
range $55.65 – $169.38
Typical copayment $0.00 (range $13.91 – $42.34)
Most-billed visit code NA
Established Patient
$69.50 typical visit price
range $17.76 – $137.92
Typical copayment $17.37 (range $4.44 – $34.48)
Most-billed visit code 99213
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 20

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

DR. PATRICIA TEREESE JIMENEZ MD
Obstetrics & Gynecology (Reproductive Endocrinology)
4444 FOREST PARK AVE, DIV OB REPRODUCTIVE ENDOCRINOLOGY, STE 3100
SAINT LOUIS, MO 63108
St. Louis City (314) 286-2400
DR. DANIELLE BUCHANAN IVIE DPT
Physical Therapist
4444 FOREST PARK AVE, STE 1210
SAINT LOUIS, MO 63108
St. Louis City (314) 286-1940
MS. MARY GRACE PORTELL LPC
Counselor (Professional)
4444 FOREST PARK AVE, STE 2600
SAINT LOUIS, MO 63108
St. Louis City (314) 286-1700
MRS. PATRICIA K NELLIS OT
Occupational Therapist
4444 FOREST PARK AVE, DEPT OCCUPATIONAL THERAPY, STE 2210
SAINT LOUIS, MO 63108
St. Louis City (314) 286-1669
DR. KELLY N BOTTERON MD
Psychiatry & Neurology (Child & Adolescent Psychiatry)
4444 FOREST PARK AVE, STE 2600
SAINT LOUIS, MO 63108
St. Louis City (314) 286-1700
DR. ROBERT P FUCETOLA PHD
Clinical Neuropsychologist
4444 FOREST PARK AVE, DIV NEUROPSYCHOLOGY, 2ND FL
SAINT LOUIS, MO 63108
St. Louis City (314) 362-1408
MS. CHERYL L KLOHR MS OT
Occupational Therapist
4444 FOREST PARK AVE
SAINT LOUIS, MO 63108
St. Louis City (314) 362-5079
MS. BRIDGET O OCHUKO DPT
Physical Therapist
4444 FOREST PARK AVE, STE 1210
SAINT LOUIS, MO 63108
St. Louis City (314) 286-1940

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 Michelle Horwitz's NPI number?

The NPI number for Michelle Horwitz is 1952279549. It was assigned to this individual provider in the NPPES registry on October 27, 2025.

Where is Michelle Horwitz located?

Michelle Horwitz practices at 4444 Forest Park Ave Ste 2600, Saint Louis, MO 63108. The listed phone number is (314) 286-1700.

What is Michelle Horwitz's specialty?

The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.

Is Michelle Horwitz enrolled in Medicare?

Yes. Michelle Horwitz is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Michelle Horwitz's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Michelle Horwitz reassigns Medicare benefits to Washington University (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 Michelle Horwitz's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Michelle Horwitz accept?

Health plans from Oscar Insurance Company list Michelle Horwitz 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 Michelle Horwitz was last updated on December 29, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.