DR. MICHAEL J COX MD
NPI 1154334860
Internal Medicine - Critical Care Medicine in Saint Louis, MO
About Dr. Michael J Cox Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MICHAEL J COX MD (NPI 1154334860) is an individual critical care medicine provider in Saint Louis, Missouri, licensed in Missouri (R8J98) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS, is affiliated with Eastern Oklahoma Medical Center, and is a graduate of Southern Illinois University School Of Medicine (1988).
NPPES Registry Identity
Specialties & Licenses 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. Michael J Cox Md 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
4Medicare enrollment records show Michael Cox reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Saint Louis, MO 63141
- Reassigned Medicare billing, Missouri enrollment
- 77 clinicians in this Medicare group
Chesterfield, MO 63017
- Reassigned Medicare billing, Missouri enrollment
- 263 clinicians in this Medicare group
Fort Smith, AR 72903
- Reassigned Medicare billing, Arkansas enrollment
- 658 clinicians in this Medicare group
Rocky Mount, NC 27804
- Reassigned Medicare billing, North Carolina enrollment
- 205 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 8
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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Eastern Oklahoma Medical Center
Critical Access Hospitals · Poteau, OKPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 63141 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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SAINT LOUIS, MO 63141
SAINT LOUIS, MO 63141
SAINT LOUIS, MO 63141
SAINT LOUIS, MO 63141
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 Michael Cox's NPI number?
The NPI number for Michael Cox is 1154334860. It was assigned to this individual provider in the NPPES registry on August 14, 2006.
Where is Michael Cox located?
Michael Cox practices at 621 S New Ballas Rd Suite 4006 Critical Care, Saint Louis, MO 63141. The listed phone number is (314) 251-6486.
What is Michael Cox's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Critical Care Medicine, with taxonomy code 207RC0200X.
Is Michael Cox enrolled in Medicare?
Yes. Michael Cox 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 Michael Cox's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Michael Cox reassigns Medicare benefits to 4 organizations: Mercy Clinic Adult Critical Care, LLC (Saint Louis, MO), Mercy Aco Clinical Services Inc (Chesterfield, MO), Mercy Clinic Fort Smith Communities (Fort Smith, AR) and Nhcs Physicians Inc (Rocky Mount, NC). 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 Michael Cox's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Michael Cox accept?
Health plans from Ambetter Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter from Superior HealthPlan and Ambetter of Oklahoma and 4 other insurers list Michael Cox 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.
Is Michael Cox affiliated with any hospitals?
According to CMS data, Michael Cox is affiliated with Eastern Oklahoma Medical Center.
When was this NPI record last updated?
The NPPES record for Michael Cox was last updated on August 5, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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. Michael J Cox, MD · NPI 1154334860
Critical Care Medicine physician in Saint Louis, Missouri. Individual provider, active in the CMS NPPES registry since August 14, 2006.
## Identity
- **NPI:** 1154334860 (Entity type: Individual)
- **Enumerated:** August 14, 2006
- **Primary specialty:** Internal Medicine - Critical Care Medicine · taxonomy 207RC0200X
- **State license:** R8J98 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 621 S NEW BALLAS RD, SUITE 4006 CRITICAL CARE, Saint Louis, MO 63141-8232
- **Phone:** (314) 251-6486 · **Fax:** (314) 251-6486
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Mercy Clinic Adult Critical Care, LLC (NPI 1730119421, Saint Louis, MO); Mercy Aco Clinical Services Inc (NPI 1063965093, Chesterfield, MO); Mercy Clinic Fort Smith Communities (NPI 1902073620, Fort Smith, AR); Nhcs Physicians Inc (NPI 1003028630, Rocky Mount, NC) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Southern Illinois University School Of Medicine, class of 1988
## Record status
- **NPPES last updated:** August 5, 2021
- **Other identifiers:** Medicaid 206914202 (MO)
---
Source: [NPI Profile](https://npiprofile.com/npi/1154334860) · Data from the CMS NPPES public registry.