Quick answers
- Which hospitals does Mark J. Fesler work at?
- Medicare's official clinician data lists Mark J. Fesler at 1 hospital: St Lukes Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark J. Fesler see patients?
- Medicare's clinician data lists 1 practice location in Chesterfield, MO. Call before your visit to confirm the address.
- What is Mark J. Fesler's specialty?
- Medicare lists Hematology/Oncology as the primary specialty, and also Hematopoietic Cell Transplantation and Cellular Therapy.
- Does Mark J. Fesler accept Medicare assignment?
- Yes. Medicare's clinician data says Mark J. Fesler 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.
- Does Mark J. Fesler offer telehealth?
- Medicare's clinician data says Mark J. Fesler offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Mark J. Fesler?
- (314) 205-6737, as listed in official Medicare / NPI Registry data.
- What is Mark J. Fesler's NPI number?
- 1235204066. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mark J. Fesler works
Medicare's Facility Affiliation Data lists Mark J. Fesler at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- St Lukes HospitalChesterfield, MO · Acute Care Hospital · CCN 260179
Practice locations
Addresses where Mark J. Fesler is enrolled with Medicare (CMS data updated 2026-10-02).
- 232 S Woods Mill Rd, Suite 330eChesterfield, MO 63017 (314) 205‑6737
Group practices
Medicare enrollment lists Mark J. Fesler as a member of this group (CMS data updated 2026-10-02).
- Van Amburg and Busiek MDS LLC9 clinicians in the group
Specialties
Other hematologist-oncologists in Chesterfield
Clinicians with the same Medicare primary specialty in Chesterfield, MO — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Saint Louis University School Of Medicine |
| Graduation year | 2003 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1235204066 |
| 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