Quick answers
- Which hospitals does Maddisson A. Haslett work at?
- Medicare's official clinician data lists Maddisson A. Haslett at 1 hospital: Mercy Hospital South. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Maddisson A. Haslett see patients?
- Medicare's clinician data lists 2 practice locations, including Fenton, MO and Saint Louis, MO. Call before your visit to confirm the address.
- What is Maddisson A. Haslett's specialty?
- Medicare lists Nurse Practitioner as the primary specialty.
- Does Maddisson A. Haslett accept Medicare assignment?
- Yes. Medicare's clinician data says Maddisson A. Haslett 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 Maddisson A. Haslett?
- (314) 849-0311, as listed in official Medicare / NPI Registry data.
- What is Maddisson A. Haslett's NPI number?
- 1700524618. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Maddisson A. Haslett works
Medicare's Facility Affiliation Data lists Maddisson A. Haslett at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Mercy Hospital SouthSaint Louis, MO · Acute Care Hospital · CCN 260077
Practice locations
Addresses where Maddisson A. Haslett is enrolled with Medicare (CMS data updated 2026-10-02).
- 1011 Bowles Ave, Suite 100Fenton, MO 63026 (314) 849‑0311
- 12639 Old Tesson RdSaint Louis, MO 63128
Group practices
Medicare enrollment lists Maddisson A. Haslett as a member of this group (CMS data updated 2026-10-02).
- Signature Medical Group Inc41 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Fenton
Clinicians with the same Medicare primary specialty in Fenton, MO — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2021 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1700524618 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- 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