Quick answers
- Where does John J. Grechus see patients?
- Medicare's clinician data lists 2 practice locations, including Potosi, MO. Call before your visit to confirm the address.
- What is John J. Grechus's specialty?
- Medicare lists Obstetrics/Gynecology as the primary specialty.
- Does John J. Grechus accept Medicare assignment?
- Yes. Medicare's clinician data says John J. Grechus 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 John J. Grechus?
- (573) 438-9355, as listed in official Medicare / NPI Registry data.
- What is John J. Grechus's NPI number?
- 1831171560. 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 John J. Grechus is enrolled with Medicare (CMS data updated 2026-10-02).
- 1 Southtowne DrPotosi, MO 63664 (573) 438‑9355
- PO Box, Suite 761Potosi, MO 63664
Group practices
Medicare enrollment lists John J. Grechus as a member of this group (CMS data updated 2026-10-02).
- Great Mines Health Center18 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in Missouri
Clinicians with the same Medicare primary specialty in Missouri — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Missouri, Kansas City, School Of Medicine |
| Graduation year | 1983 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1831171560 |
| 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