DR. MONTY MAZER MD
NPI 1851731913
Pediatrics - Pediatric Critical Care Medicine in Saint Louis, MO
About Dr. Monty Mazer Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MONTY MAZER MD (NPI 1851731913) is an individual pediatric critical care medicine provider in Saint Louis, Missouri, licensed in Missouri (2017009608) and active in the NPI registry since July 2013. He is enrolled in Medicare PECOS and is a graduate of Other (2013).
NPPES Registry Identity
Specialties & Licenses 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
Dr. Monty Mazer 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
2Medicare enrollment records show Monty Mazer reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Saint Louis, MO 63110
- Reassigned Medicare billing, Missouri enrollment
- 628 clinicians in this Medicare group
Cleveland, OH 44106
- Reassigned Medicare billing, Ohio enrollment
- 3,958 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.
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 63110
SAINT LOUIS, MO 63110
SAINT LOUIS, MO 63110
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 Monty Mazer's NPI number?
The NPI number for Monty Mazer is 1851731913. It was assigned to this individual provider in the NPPES registry on July 2, 2013.
Where is Monty Mazer located?
Monty Mazer practices at 1 Childrens Pl, Saint Louis, MO 63110. The listed phone number is (314) 454-2527.
What is Monty Mazer's specialty?
The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Critical Care Medicine, with taxonomy code 2080P0203X.
Is Monty Mazer enrolled in Medicare?
Yes. Monty Mazer 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 Monty Mazer's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Monty Mazer reassigns Medicare benefits to 2 organizations: Washington University (Saint Louis, MO) and University Hospitals Medical Group Inc (Cleveland, OH). 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 Monty Mazer's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Monty Mazer accept?
Health plans from CareSource list Monty Mazer 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 Monty Mazer was last updated on December 4, 2020. 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. Monty Mazer, MD · NPI 1851731913
Pediatric Critical Care Medicine physician in Saint Louis, Missouri. Individual provider, active in the CMS NPPES registry since July 2, 2013.
## Identity
- **NPI:** 1851731913 (Entity type: Individual)
- **Enumerated:** July 2, 2013
- **Primary specialty:** Pediatrics - Pediatric Critical Care Medicine · taxonomy 2080P0203X
- **State license:** 2017009608 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 1 CHILDRENS PL, Saint Louis, MO 63110-1002
- **Phone:** (314) 454-2527 · **Fax:** (314) 747-8880
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Washington University (NPI 1194765685, Saint Louis, MO); University Hospitals Medical Group Inc (NPI 1669499414, Cleveland, OH) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2013
## Record status
- **NPPES last updated:** December 4, 2020
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Source: [NPI Profile](https://npiprofile.com/npi/1851731913) · Data from the CMS NPPES public registry.