IOANA MARCU
NPI 1316393473
Obstetrics & Gynecology in Saint Louis, MO
About Ioana Marcu NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
IOANA MARCU (NPI 1316393473) is an individual obstetrics & gynecology provider in Saint Louis, Missouri, licensed in Missouri (2025043275) and active in the NPI registry since May 2016. She is enrolled in Medicare PECOS, is affiliated with Mercy Hospital St Louis, and is a graduate of Saint Louis University School Of Medicine (2016).
NPPES Registry Identity
Specialties & Licenses
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
Ioana Marcu 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 Ioana Marcu reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Washington, MO 63090
- Reassigned Medicare billing, Missouri enrollment
- 168 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.
Hospital Affiliations CMS Care Compare
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, 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.
Referred Medical Equipment & Supplies CMS DME claims
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 3
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 Ioana Marcu's NPI number?
The NPI number for Ioana Marcu is 1316393473. It was assigned to this individual provider in the NPPES registry on May 9, 2016.
Where is Ioana Marcu located?
Ioana Marcu practices at 621 S New Ballas Rd Ste 499A, Saint Louis, MO 63141. The listed phone number is (314) 251-7650.
What is Ioana Marcu's specialty?
The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.
Is Ioana Marcu enrolled in Medicare?
Yes. Ioana Marcu 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 Ioana Marcu's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ioana Marcu reassigns Medicare benefits to Mercy Clinic Surgical Specialists, LLC (Washington, 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 Ioana Marcu's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Ioana Marcu 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 3 other insurers list Ioana Marcu 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 Ioana Marcu affiliated with any hospitals?
According to CMS data, Ioana Marcu is affiliated with Mercy Hospital St Louis.
When was this NPI record last updated?
The NPPES record for Ioana Marcu was last updated on March 11, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 months 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.
# Ioana Marcu · NPI 1316393473
Obstetrics & Gynecology physician in Saint Louis, Missouri. Individual provider, active in the CMS NPPES registry since May 9, 2016.
## Identity
- **NPI:** 1316393473 (Entity type: Individual)
- **Enumerated:** May 9, 2016
- **Primary specialty:** Obstetrics & Gynecology · taxonomy 207V00000X
- **State license:** 2025043275 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 621 S NEW BALLAS RD STE 499A, Saint Louis, MO 63141-8260
- **Phone:** (314) 251-7650 · **Fax:** (314) 251-7651
## 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:** Mercy Clinic Surgical Specialists, LLC (NPI 1043530538, Washington, MO), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Saint Louis University School Of Medicine, class of 2016
## Record status
- **NPPES last updated:** March 11, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1316393473) · Data from the CMS NPPES public registry.