DR. WALTER LEE MICKEY D.O.
NPI 1306109384
Internal Medicine - Critical Care Medicine in Saint Louis, MO
About Dr. Walter Lee Mickey D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. WALTER LEE MICKEY D.O. (NPI 1306109384) is an individual critical care medicine provider in Saint Louis, Missouri, licensed in Missouri (2014011937) and active in the NPI registry since June 2012. He is enrolled in Medicare PECOS, is affiliated with Mercy Hospital St Louis, and is a graduate of Other (2012).
NPPES Registry Identity
Specialties & Licenses
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. Walter Lee Mickey 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
3Medicare enrollment records show Walter Mickey reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Fenton, MO 63026
- Reassigned Medicare billing, Missouri enrollment
- 741 clinicians in this Medicare group
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
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 3
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.
Mercy Hospital St Louis
Acute Care Hospitals · Saint Louis, MOPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 63122 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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 Walter Mickey's NPI number?
The NPI number for Walter Mickey is 1306109384. It was assigned to this individual provider in the NPPES registry on June 24, 2012.
Where is Walter Mickey located?
Walter Mickey practices at 621 S Ballas Rd Ste 7020, Saint Louis, MO 63122. The listed phone number is (314) 251-6000.
What is Walter Mickey's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Critical Care Medicine, with taxonomy code 207RC0200X.
Is Walter Mickey enrolled in Medicare?
Yes. Walter Mickey 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 Walter Mickey's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Walter Mickey reassigns Medicare benefits to 3 organizations: Ssm Health Care St Louis (Fenton, MO), Mercy Clinic Adult Critical Care, LLC (Saint Louis, MO) and Mercy Aco Clinical Services Inc (Chesterfield, MO). 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 Walter Mickey's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Walter Mickey accept?
Health plans from Anthem Blue Cross and Blue Shield list Walter Mickey 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 Walter Mickey affiliated with any hospitals?
According to CMS data, Walter Mickey is affiliated with Mercy Hospital St Louis.
When was this NPI record last updated?
The NPPES record for Walter Mickey was last updated on March 23, 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. Walter Lee Mickey, D.O. · NPI 1306109384
Critical Care Medicine physician in Saint Louis, Missouri. Individual provider, active in the CMS NPPES registry since June 24, 2012.
## Identity
- **NPI:** 1306109384 (Entity type: Individual)
- **Enumerated:** June 24, 2012
- **Primary specialty:** Internal Medicine - Critical Care Medicine · taxonomy 207RC0200X
- **State license:** 2014011937 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 621 S BALLAS RD STE 7020, Saint Louis, MO 63122-5314
- **Phone:** (314) 251-6000
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Ssm Health Care St Louis (NPI 1275586174, Fenton, MO); Mercy Clinic Adult Critical Care, LLC (NPI 1730119421, Saint Louis, MO); Mercy Aco Clinical Services Inc (NPI 1063965093, Chesterfield, MO) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2012
## Record status
- **NPPES last updated:** March 23, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1306109384) · Data from the CMS NPPES public registry.