DR. MARY KATHRYN MALECEK MD
NPI 1144647355
Internal Medicine - Hematology & Oncology in Saint Louis, MO
About Dr. Mary Kathryn Malecek Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARY KATHRYN MALECEK MD (NPI 1144647355) is an individual hematology & oncology provider in Saint Louis, Missouri, licensed in Missouri (2017010068) and active in the NPI registry since March 2014. She is enrolled in Medicare PECOS, is affiliated with Memorial Hospital, and is a graduate of University Of Illinois College Of Med (chi/peor/rock/chm-urb) (2014).
NPPES Registry Identity
Specialties & Licenses
Other Names 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. Mary Kathryn Malecek 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 Mary Malecek 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 63131
- Reassigned Medicare billing, Missouri enrollment
- 25 clinicians in this Medicare group
Saint Louis, MO 63110
- Reassigned Medicare billing, Missouri enrollment
- 1,133 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 9
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.
Memorial Hospital
Acute Care Hospitals · Belleville, ILBarnes Jewish Hospital
Acute Care Hospitals · Saint Louis, MOMissouri Baptist Medical Center
Acute Care Hospitals · Town And Country, MOBarnes-Jewish West County Hospital
Acute Care Hospitals · Creve Coeur, MOParkland Health Center
Acute Care Hospitals · Farmington, MOPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 63131 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.
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 63131
SAINT LOUIS, MO 63131
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 Mary Malecek's NPI number?
The NPI number for Mary Malecek is 1144647355. It was assigned to this individual provider in the NPPES registry on March 25, 2014. The provider is also known as Dr. Mary Kathryn Duncan MD.
Where is Mary Malecek located?
Mary Malecek practices at 3015 N Ballas Rd, Saint Louis, MO 63131. The listed phone number is (314) 996-5151.
What is Mary Malecek's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.
Is Mary Malecek enrolled in Medicare?
Yes. Mary Malecek 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 Mary Malecek's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mary Malecek reassigns Medicare benefits to 2 organizations: Missouri Baptist Physician Services LLC (Saint Louis, MO) and Washington University (Saint Louis, 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 Mary Malecek's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mary Malecek accept?
Health plans from UnitedHealthcare list Mary Malecek 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 Mary Malecek affiliated with any hospitals?
According to CMS data, Mary Malecek is affiliated with Memorial Hospital, Barnes Jewish Hospital, Missouri Baptist Medical Center, Barnes-Jewish West County Hospital and Parkland Health Center.
When was this NPI record last updated?
The NPPES record for Mary Malecek was last updated on October 29, 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. Mary Kathryn Malecek, MD · NPI 1144647355
Hematology & Oncology physician in Saint Louis, Missouri. Individual provider, active in the CMS NPPES registry since March 25, 2014.
## Identity
- **NPI:** 1144647355 (Entity type: Individual)
- **Enumerated:** March 25, 2014
- **Primary specialty:** Internal Medicine - Hematology & Oncology · taxonomy 207RH0003X
- **State license:** 2017010068 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 3015 N BALLAS RD, Saint Louis, MO 63131-2329
- **Phone:** (314) 996-5151
## 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): Missouri Baptist Physician Services LLC (NPI 1245310291, Saint Louis, MO); Washington University (NPI 1992746903, Saint Louis, MO) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Illinois College Of Med, class of 2014
## Record status
- **NPPES last updated:** October 29, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1144647355) · Data from the CMS NPPES public registry.