Quick answers
- Where does Mason J. Lee see patients?
- Medicare's clinician data lists 4 practice locations, including Saint Louis, MO, Chicago, IL and Nashville, TN. Call before your visit to confirm the address.
- What is Mason J. Lee's specialty?
- Medicare lists Family Practice as the primary specialty.
- Does Mason J. Lee accept Medicare assignment?
- Medicare's clinician data says Mason J. Lee may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- What is Mason J. Lee's NPI number?
- 1053007955. 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 Mason J. Lee is enrolled with Medicare (CMS data updated 2026-10-02).
- 660 Mason Ridge Ctr Dr, Suite 300Saint Louis, MO 63141
- PO BoxChicago, IL 60677
- PO Box, Suite 415000Nashville, TN 37241
- PO Box 415000 Msc, Suite 8508Nashville, TN 37241
Specialties
- Family Practiceprimary
Other family doctors in Saint Louis
Clinicians with the same Medicare primary specialty in Saint Louis, MO — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Graduation year | 2023 |
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1053007955 |
| 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