DR. THOMAS HORN JR. D.O.
NPI 1841516598
Psychiatry & Neurology - Psychiatry in Chesterfield, MO
About Dr. Thomas Horn Jr. D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. THOMAS HORN JR. D.O. (NPI 1841516598) is an individual psychiatry provider in Chesterfield, Missouri, licensed in Missouri (2014000221) and active in the NPI registry since April 2010. He is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of University Of Texas Medical School At Houston (2010).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 2
Other Identifiers 1
Accepted 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
Dr. Thomas Horn Jr. D.o. 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.
Medicare Billing Reassignments
6Medicare enrollment records show Thomas Horn reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Chesterfield, MO 63017
- Reassigned Medicare billing, Missouri enrollment
- 263 clinicians in this Medicare group
Saint Louis, MO 63141
- Reassigned Medicare billing, Missouri enrollment
- 13 clinicians in this Medicare group
Winfield, MO 63389
- Reassigned Medicare billing, Missouri enrollment
- 229 clinicians in this Medicare group
Festus, MO 63028
- Reassigned Medicare billing, Missouri enrollment
- 32 clinicians in this Medicare group
Cuba, MO 65453
- Reassigned Medicare billing, Missouri enrollment
- Also billed through NPI 1245277631 (Missouri)
- 1,487 clinicians in this Medicare group
Perryville, MO 63775
- Reassigned Medicare billing, Missouri enrollment
- 192 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 4
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 63017 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 7
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
CHESTERFIELD, MO 63017
TOWN AND COUNTRY, MO 63017
CHESTERFIELD, MO 63017
CHESTERFIELD, MO 63017
CHESTERFIELD, MO 63017
CHESTERFIELD, MO 63017
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 Thomas Horn's NPI number?
The NPI number for Thomas Horn is 1841516598. It was assigned to this individual provider in the NPPES registry on April 19, 2010.
Where is Thomas Horn located?
Thomas Horn practices at 1176 Town And Country Commons Dr, Chesterfield, MO 63017. The listed phone number is (314) 251-2870.
What is Thomas Horn's specialty?
The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.
Is Thomas Horn enrolled in Medicare?
Yes. Thomas Horn 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 organizations bill Medicare for Thomas Horn's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Thomas Horn reassigns Medicare benefits to 6 organizations: Mercy Aco Clinical Services Inc (Chesterfield, MO), Mercy Clinic Child And Adolescent Psychiatry, LLC (Saint Louis, MO), Mercy Hospital Lincoln (Winfield, MO), Mercy Clinic Adult Psychiatry, LLC (Festus, MO), Mercy Clinic Springfield Communities (Cuba, MO) and 1 more organization, listed in the Medicare section above. Each 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 Thomas Horn's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Thomas Horn accept?
Health plans from Anthem Blue Cross and Blue Shield, Medica, Oscar Insurance Company and UnitedHealthcare list Thomas Horn 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 Thomas Horn was last updated on July 18, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Dr. Thomas Horn Jr., D.O. · NPI 1841516598
Psychiatry physician in Chesterfield, Missouri. Individual provider, active in the CMS NPPES registry since April 19, 2010.
## Identity
- **NPI:** 1841516598 (Entity type: Individual)
- **Enumerated:** April 19, 2010
- **Primary specialty:** Psychiatry & Neurology - Psychiatry · taxonomy 2084P0800X
- **State license:** 2014000221 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 1176 TOWN AND COUNTRY COMMONS DR, Chesterfield, MO 63017-8200
- **Phone:** (314) 251-2870 · **Fax:** (314) 251-2871
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 6 organizations under Medicare reassignment (form CMS-855R): Mercy Aco Clinical Services Inc (NPI 1063965093, Chesterfield, MO); Mercy Clinic Child And Adolescent Psychiatry, LLC (NPI 1265562300, Saint Louis, MO); Mercy Hospital Lincoln (NPI 1386040178, Winfield, MO); Mercy Clinic Adult Psychiatry, LLC (NPI 1750788972, Festus, MO); Mercy Clinic Springfield Communities (NPI 1063541704, Cuba, MO); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Texas Medical School At Houston, class of 2010
## Record status
- **NPPES last updated:** July 18, 2023
- **Other identifiers:** Medicaid 1841516598 (MO)
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Source: [NPI Profile](https://npiprofile.com/npi/1841516598) · Data from the CMS NPPES public registry.