Quick answers
- Where does Micaela E. Oneil Callahan see patients?
- Medicare's clinician data lists 1 practice location in Saint Louis, MO. Call before your visit to confirm the address.
- What is Micaela E. Oneil Callahan's specialty?
- Medicare lists Obstetrics/Gynecology as the primary specialty.
- Does Micaela E. Oneil Callahan accept Medicare assignment?
- Yes. Medicare's clinician data says Micaela E. Oneil Callahan accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Micaela E. Oneil Callahan?
- (314) 251-7955, as listed in official Medicare / NPI Registry data.
- What is Micaela E. Oneil Callahan's NPI number?
- 1568783850. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Micaela E. Oneil Callahan is enrolled with Medicare (CMS data updated 2026-10-02).
- 615 S New Ballas RdSaint Louis, MO 63141 (314) 251‑7955
Group practices
Medicare enrollment lists Micaela E. Oneil Callahan as a member of this group (CMS data updated 2026-10-02).
- Mercy Womens Services LLC13 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in Saint Louis
Clinicians with the same Medicare primary specialty in Saint Louis, MO — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Wisconsin School Of Medicine |
| Graduation year | 2010 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1568783850 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians