DR. MARY RUI YU MD
NPI 1861807026
Emergency Medicine in Saint Louis, MO
About Dr. Mary Rui Yu Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARY RUI YU MD (NPI 1861807026) is an individual emergency medicine provider in Saint Louis, Missouri, licensed in Missouri (2016011166) and active in the NPI registry since June 2014. She is enrolled in Medicare PECOS, is affiliated with Memorial Hospital, and is a graduate of Other (2014).
NPPES Registry Identity
Specialties & Licenses
Other Names 1
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 Rui Yu 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
8Medicare enrollment records show Mary Yu reassigns Medicare billing to 8 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Richmond Heights, MO 63117
- Reassigned Medicare billing, Missouri enrollment
- 269 clinicians in this Medicare group
Chesterfield, MO 63017
- Reassigned Medicare billing, Missouri enrollment
- 263 clinicians in this Medicare group
Belleville, IL 62226
- Reassigned Medicare billing, Illinois enrollment
- 111 clinicians in this Medicare group
Alton, IL 62002
- Reassigned Medicare billing, Missouri enrollment
- 343 clinicians in this Medicare group
Festus, MO 63028
- Reassigned Medicare billing, Missouri enrollment
- 118 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
Potosi, MO 63664
- Reassigned Medicare billing, Missouri enrollment
- 60 clinicians in this Medicare group
Perryville, MO 63775
- Reassigned Medicare billing, Missouri enrollment
- Also billed through NPI 1063117158 (Missouri)
- 192 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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Memorial Hospital
Acute Care Hospitals · Belleville, ILPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 63110 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 6
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
ST. LOUIS, MO 63110
SAINT LOUIS, MO 63110
ST LOUIS, MO 63110
SAINT LOUIS, MO 63110
ST 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 Mary Yu's NPI number?
The NPI number for Mary Yu is 1861807026. It was assigned to this individual provider in the NPPES registry on June 26, 2014. The provider is also known as Dr. Mary R Yu MD.
Where is Mary Yu located?
Mary Yu practices at 1 Barnes-Jewish Hospital Plaza Barnes-Jewish Hospital, Saint Louis, MO 63110. The listed phone number is (314) 362-5000.
What is Mary Yu's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Mary Yu enrolled in Medicare?
Yes. Mary Yu 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 Yu's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mary Yu reassigns Medicare benefits to 8 organizations: Cep America LLC (Richmond Heights, MO), Mercy Aco Clinical Services Inc (Chesterfield, MO), Emergency Services Midwest Sc (Belleville, IL), Southeastern Emergency Physicians Of Memphis LLC (Alton, IL), Mercy Hospital Jefferson (Festus, MO) and 3 more organizations, listed in the Medicare section above. 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 Yu's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Mary Yu affiliated with any hospitals?
According to CMS data, Mary Yu is affiliated with Memorial Hospital.
When was this NPI record last updated?
The NPPES record for Mary Yu was last updated on August 10, 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 Rui Yu, MD · NPI 1861807026
Emergency Medicine physician in Saint Louis, Missouri. Individual provider, active in the CMS NPPES registry since June 26, 2014.
## Identity
- **NPI:** 1861807026 (Entity type: Individual)
- **Enumerated:** June 26, 2014
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 2016011166 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 1 BARNES-JEWISH HOSPITAL PLAZA, BARNES-JEWISH HOSPITAL, Saint Louis, MO 63110-1010
- **Phone:** (314) 362-5000
## 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:** 8 organizations under Medicare reassignment (form CMS-855R): Cep America LLC (NPI 1942855366, Richmond Heights, MO); Mercy Aco Clinical Services Inc (NPI 1063965093, Chesterfield, MO); Emergency Services Midwest Sc (NPI 1174024806, Belleville, IL); Southeastern Emergency Physicians Of Memphis LLC (NPI 1437105277, Alton, IL); Mercy Hospital Jefferson (NPI 1508859661, Festus, MO); and 3 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2014
## Record status
- **NPPES last updated:** August 10, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1861807026) · Data from the CMS NPPES public registry.