DR. LESLIE E. MEZEI M.D.
NPI 1992800429
Internal Medicine - Cardiovascular Disease in Saint Louis, MO
About Dr. Leslie E. Mezei M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. LESLIE E. MEZEI M.D. (NPI 1992800429) is an individual cardiovascular disease provider in Saint Louis, Missouri, licensed in Missouri (R3E74) 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 Other (1982).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 10
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. Leslie E. Mezei 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 Reassignment
Medicare enrollment records show Leslie Mezei reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Chesterfield, MO 63017
- Reassigned Medicare billing, Missouri enrollment
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 5
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, MOBarnes Jewish Hospital
Acute Care Hospitals · Saint Louis, MOMercy Hospital South
Acute Care Hospitals · Saint Louis, MOMissouri Baptist Medical Center
Acute Care Hospitals · Town And Country, MOSt Lukes Hospital
Acute Care Hospitals · Chesterfield, MOPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 63105 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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 Leslie Mezei's NPI number?
The NPI number for Leslie Mezei is 1992800429. It was assigned to this individual provider in the NPPES registry on September 13, 2006.
Where is Leslie Mezei located?
Leslie Mezei practices at 139 N Central Ave Apt D, Saint Louis, MO 63105. The listed phone number is (314) 486-1396.
What is Leslie Mezei's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Cardiovascular Disease, with taxonomy code 207RC0000X.
Is Leslie Mezei enrolled in Medicare?
Yes. Leslie Mezei 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 organization bills Medicare for Leslie Mezei's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Leslie Mezei reassigns Medicare benefits to St. John's Cardiovascular Associates L.L.C. (Chesterfield, MO). The 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 Leslie Mezei's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Leslie Mezei affiliated with any hospitals?
According to CMS data, Leslie Mezei is affiliated with Mercy Hospital St Louis, Barnes Jewish Hospital, Mercy Hospital South, Missouri Baptist Medical Center and St Lukes Hospital.
When was this NPI record last updated?
The NPPES record for Leslie Mezei was last updated on October 20, 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. Leslie E. Mezei, M.D. · NPI 1992800429
Cardiovascular Disease physician in Saint Louis, Missouri. Individual provider, active in the CMS NPPES registry since September 13, 2006.
## Identity
- **NPI:** 1992800429 (Entity type: Individual)
- **Enumerated:** September 13, 2006
- **Primary specialty:** Internal Medicine - Cardiovascular Disease · taxonomy 207RC0000X
- **State license:** R3E74 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 139 N CENTRAL AVE APT D, Saint Louis, MO 63105-3800
- **Phone:** (314) 486-1396 · **Fax:** (314) 485-3520
## 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:** St. John's Cardiovascular Associates L.L.C. (NPI 1518062017, Chesterfield, MO), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1982
## Record status
- **NPPES last updated:** October 20, 2021
- **Other identifiers:** Other 4061166 (MO); Other STL2500039 (MO); Other 254499 (MO); and 7 more
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Source: [NPI Profile](https://npiprofile.com/npi/1992800429) · Data from the CMS NPPES public registry.