Quick answers
- Where does Mary E. Johnson see patients?
- Medicare's clinician data lists 1 practice location in O Fallon, MO. Call before your visit to confirm the address.
- What is Mary E. Johnson's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does Mary E. Johnson accept Medicare assignment?
- Yes. Medicare's clinician data says Mary E. Johnson 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 Mary E. Johnson?
- (636) 441-3444, as listed in official Medicare / NPI Registry data.
- What is Mary E. Johnson's NPI number?
- 1992944904. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Mary E. Johnson is enrolled with Medicare (CMS data updated 2026-10-02).
- 4701 State Hwy KO Fallon, MO 63368 (636) 441‑3444
Group practices
Medicare enrollment lists Mary E. Johnson as a member of this group (CMS data updated 2026-10-02).
- St Peters Bone and Joint Surgery Inc26 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in O Fallon
Clinicians with the same Medicare primary specialty in O Fallon, MO — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2009 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1992944904 |
| 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
- 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