ZACHARY KELLER MD
NPI 1962865170
Obstetrics & Gynecology in Saint Louis, MO
About Zachary Keller Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ZACHARY KELLER MD (NPI 1962865170) is an individual obstetrics & gynecology provider in Saint Louis, Missouri, licensed in Missouri (2020023080) and active in the NPI registry since April 2016. He 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
Zachary Keller 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 Zachary Keller 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 63141
- Reassigned Medicare billing, Missouri enrollment
- 744 clinicians in this Medicare group
Cape Girardeau, MO 63701
- Reassigned Medicare billing, Missouri enrollment
- 470 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 3
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, MOMercy Hospital South
Acute Care Hospitals · Saint Louis, MOSt Lukes Hospital
Acute Care Hospitals · Chesterfield, 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.
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 Zachary Keller's NPI number?
The NPI number for Zachary Keller is 1962865170. It was assigned to this individual provider in the NPPES registry on April 4, 2016.
Where is Zachary Keller located?
Zachary Keller practices at 621 S New Ballas Rd Ste 499A, Saint Louis, MO 63141. The listed phone number is (314) 251-7477.
What is Zachary Keller's specialty?
The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.
Is Zachary Keller enrolled in Medicare?
Yes. Zachary Keller 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 Zachary Keller's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Zachary Keller reassigns Medicare benefits to 2 organizations: Mercy Clinic East Communities (Saint Louis, MO) and Southeast Missouri Hospital Physicians, LLC (Cape Girardeau, 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 Zachary Keller's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Zachary Keller accept?
Health plans from Anthem Blue Cross and Blue Shield and UnitedHealthcare list Zachary Keller 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 Zachary Keller affiliated with any hospitals?
According to CMS data, Zachary Keller is affiliated with Mercy Hospital St Louis, Mercy Hospital South and St Lukes Hospital.
When was this NPI record last updated?
The NPPES record for Zachary Keller was last updated on August 20, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.
# Zachary Keller, MD · NPI 1962865170
Obstetrics & Gynecology physician in Saint Louis, Missouri. Individual provider, active in the CMS NPPES registry since April 4, 2016.
## Identity
- **NPI:** 1962865170 (Entity type: Individual)
- **Enumerated:** April 4, 2016
- **Primary specialty:** Obstetrics & Gynecology · taxonomy 207V00000X
- **State license:** 2020023080 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 621 S NEW BALLAS RD STE 499A, Saint Louis, MO 63141-8260
- **Phone:** (314) 251-7477
## 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): Mercy Clinic East Communities (NPI 1043574940, Saint Louis, MO); Southeast Missouri Hospital Physicians, LLC (NPI 1558311522, Cape Girardeau, MO) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Saint Louis University School Of Medicine, class of 2016
## Record status
- **NPPES last updated:** August 20, 2020
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Source: [NPI Profile](https://npiprofile.com/npi/1962865170) · Data from the CMS NPPES public registry.