Quick answers
- Which hospitals does Nicholas W. Frederickson work at?
- Medicare's official clinician data lists Nicholas W. Frederickson at 2 hospitals: Mercy Hospital Washington and Missouri Baptist Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Nicholas W. Frederickson see patients?
- Medicare's clinician data lists 1 practice location in Washington, MO. Call before your visit to confirm the address.
- What is Nicholas W. Frederickson's specialty?
- Medicare lists Gastroenterology as the primary specialty.
- Does Nicholas W. Frederickson accept Medicare assignment?
- Yes. Medicare's clinician data says Nicholas W. Frederickson 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 Nicholas W. Frederickson?
- (636) 239-7344, as listed in official Medicare / NPI Registry data.
- What is Nicholas W. Frederickson's NPI number?
- 1154640225. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Nicholas W. Frederickson works
Medicare's Facility Affiliation Data lists Nicholas W. Frederickson at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Mercy Hospital WashingtonWashington, MO · Acute Care Hospital · CCN 260052
- Missouri Baptist Medical CenterSaint Louis, MO · Acute Care Hospital · CCN 260108
Practice locations
Addresses where Nicholas W. Frederickson is enrolled with Medicare (CMS data updated 2026-10-02).
- 901 Patients 1st Dr, Suite 3300Washington, MO 63090 (636) 239‑7344
Group practices
Medicare enrollment lists Nicholas W. Frederickson as a member of this group (CMS data updated 2026-10-02).
- Mercy Clinic Gastroenterology LLC67 clinicians in the group
Specialties
- Gastroenterologyprimary
Other gastroenterologists in Missouri
Clinicians with the same Medicare primary specialty in Missouri — not a recommendation.
Clinician information
| Medical school | Saint Louis University School Of Medicine |
|---|---|
| Graduation year | 2010 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1154640225 |
| 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