Quick answers
- Which hospitals does Gretchen E. Farmer work at?
- Medicare's official clinician data lists Gretchen E. Farmer at 2 hospitals: Mercy Hospital St Louis and Mercy Hospital Washington. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Gretchen E. Farmer see patients?
- Medicare's clinician data lists 2 practice locations, including Union, MO and Washington, MO. Call before your visit to confirm the address.
- What is Gretchen E. Farmer's specialty?
- Medicare lists Internal Medicine as the primary specialty, and also Pediatric Medicine.
- Does Gretchen E. Farmer accept Medicare assignment?
- Yes. Medicare's clinician data says Gretchen E. Farmer 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 Gretchen E. Farmer?
- (636) 583-2508, as listed in official Medicare / NPI Registry data.
- What is Gretchen E. Farmer's NPI number?
- 1720283450. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Gretchen E. Farmer works
Medicare's Facility Affiliation Data lists Gretchen E. Farmer 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
- Mercy Hospital WashingtonWashington, MO · Acute Care Hospital · CCN 260052
Practice locations
Addresses where Gretchen E. Farmer is enrolled with Medicare (CMS data updated 2026-10-02).
- 1935 Prairie Dell Rd, Suite 400Union, MO 63084 (636) 583‑2508
- 851 E 5th StWashington, MO 63090
Group practices
Medicare enrollment lists Gretchen E. Farmer as a member of this group (CMS data updated 2026-10-02).
- Mercy Clinic East Communities571 clinicians in the group
Specialties
- Internal Medicineprimary
- Pediatric Medicinealso
Other internal medicine doctors in Missouri
Clinicians with the same Medicare primary specialty in Missouri — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Saint Louis University School Of Medicine |
| Graduation year | 2003 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1720283450 |
| 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