MR. JOHN H WILMAS JR. M.D.
NPI 1952406142
Emergency Medicine in Saint Louis, MO
About Mr. John H Wilmas Jr. M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MR. JOHN H WILMAS JR. M.D. (NPI 1952406142) is an individual emergency medicine provider in Saint Louis, Missouri, licensed in Missouri (2003003353) and active in the NPI registry since September 2006. He is enrolled in Medicare PECOS, is affiliated with Mercy Hospital St Louis, and is a graduate of Saint Louis University School Of Medicine (1996).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 2
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
Mr. John H Wilmas Jr. M.d. 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
5Medicare enrollment records show John Wilmas reassigns Medicare billing to 5 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
- 241 clinicians in this Medicare group
Saint Louis, MO 63128
- Reassigned Medicare billing, Missouri enrollment
- 186 clinicians in this Medicare group
Winfield, MO 63389
- Reassigned Medicare billing, Missouri enrollment
- Also billed through NPI 1962808733 (Missouri)
- 229 clinicians in this Medicare group
Festus, MO 63028
- Reassigned Medicare billing, Missouri enrollment
- 118 clinicians in this Medicare group
Washington, MO 63090
- Reassigned Medicare billing, Missouri enrollment
- 178 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 2
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 2
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, MOMercy Hospital Lincoln
Critical Access Hospitals · Troy, MOPhysician 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
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 John Wilmas's NPI number?
The NPI number for John Wilmas is 1952406142. It was assigned to this individual provider in the NPPES registry on September 13, 2006.
Where is John Wilmas located?
John Wilmas practices at 615 S New Ballas Rd Dept Of Emergency Medicine, Saint Louis, MO 63141. The listed phone number is (314) 251-6816.
What is John Wilmas's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is John Wilmas enrolled in Medicare?
Yes. John Wilmas 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 John Wilmas's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Wilmas reassigns Medicare benefits to 5 organizations: Mercy Hospitals East Communities (Saint Louis, MO), Mercy Hospital South (Saint Louis, MO), Mercy Hospital Lincoln (Winfield, MO), Mercy Hospital Jefferson (Festus, MO) and Mercy Hospitals East Communities (Washington, 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 John Wilmas's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does John Wilmas accept?
Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from Arkansas Health & Wellness, Ambetter from Sunflower Health Plan and Ambetter of Oklahoma and 2 other insurers list John Wilmas 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 John Wilmas affiliated with any hospitals?
According to CMS data, John Wilmas is affiliated with Mercy Hospital St Louis and Mercy Hospital Lincoln.
When was this NPI record last updated?
The NPPES record for John Wilmas was last updated on July 25, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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.
# Mr. John H Wilmas Jr., M.D. · NPI 1952406142
Emergency Medicine physician in Saint Louis, Missouri. Individual provider, active in the CMS NPPES registry since September 13, 2006.
## Identity
- **NPI:** 1952406142 (Entity type: Individual)
- **Enumerated:** September 13, 2006
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 2003003353 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 615 S NEW BALLAS RD, DEPT OF EMERGENCY MEDICINE, Saint Louis, MO 63141-8221
- **Phone:** (314) 251-6816
## 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:** 5 organizations under Medicare reassignment (form CMS-855R): Mercy Hospitals East Communities (NPI 1427098169, Saint Louis, MO); Mercy Hospital South (NPI 1568481984, Saint Louis, MO); Mercy Hospital Lincoln (NPI 1386040178, Winfield, MO); Mercy Hospital Jefferson (NPI 1508859661, Festus, MO); Mercy Hospitals East Communities (NPI 1104912997, Washington, MO) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Saint Louis University School Of Medicine, class of 1996
## Record status
- **NPPES last updated:** July 25, 2014
- **Other identifiers:** Medicaid 1952406142 (MO); Medicare PIN 0928780157 (MO)
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Source: [NPI Profile](https://npiprofile.com/npi/1952406142) · Data from the CMS NPPES public registry.