Quick answers
- Which hospitals does Mark S. Krasnoff work at?
- Medicare's official clinician data lists Mark S. Krasnoff at 5 hospitals: Mercy Hospital St Louis, SSM Health Saint Louis University Hospital, SSM Health St Mary's Hospital - St Louis, SSM St Clare Health Center and St Lukes Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark S. Krasnoff see patients?
- Medicare's clinician data lists 1 practice location in Saint Louis, MO. Call before your visit to confirm the address.
- What is Mark S. Krasnoff's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Mark S. Krasnoff accept Medicare assignment?
- Yes. Medicare's clinician data says Mark S. Krasnoff 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 S. Krasnoff offer telehealth?
- Medicare's clinician data says Mark S. Krasnoff offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Mark S. Krasnoff?
- (314) 925-4700, as listed in official Medicare / NPI Registry data.
- What is Mark S. Krasnoff's NPI number?
- 1821016064. 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 S. Krasnoff works
Medicare's Facility Affiliation Data lists Mark S. Krasnoff at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Mercy Hospital St LouisSaint Louis, MO · Acute Care Hospital · CCN 260020
- SSM Health Saint Louis University HospitalSaint Louis, MO · Acute Care Hospital · CCN 260105
- SSM Health St Mary's Hospital - St LouisSaint Louis, MO · Acute Care Hospital · CCN 260091
- SSM St Clare Health CenterFenton, MO · Acute Care Hospital · CCN 260081
- St Lukes HospitalChesterfield, MO · Acute Care Hospital · CCN 260179
Practice locations
Addresses where Mark S. Krasnoff is enrolled with Medicare (CMS data updated 2026-10-02).
- 1035 Bellevue Ave, Suite 400Saint Louis, MO 63117 (314) 925‑4700
Group practices
Medicare enrollment lists Mark S. Krasnoff as a member of this group (CMS data updated 2026-10-02).
- SSM Medical Group Inc568 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Saint Louis
Clinicians with the same Medicare primary specialty in Saint Louis, MO — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Johns Hopkins University School Of Medicine |
| Graduation year | 1991 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1821016064 |
| 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