Quick answers
- Where does Gregory G. Zell see patients?
- Medicare's clinician data lists 2 practice locations, including Missoula, MT and Billings, MT. Call before your visit to confirm the address.
- What is Gregory G. Zell's specialty?
- Medicare lists Optometry as the primary specialty.
- Does Gregory G. Zell accept Medicare assignment?
- Yes. Medicare's clinician data says Gregory G. Zell 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 Gregory G. Zell?
- (406) 721-4646, as listed in official Medicare / NPI Registry data.
- What is Gregory G. Zell's NPI number?
- 1679534705. 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 Gregory G. Zell is enrolled with Medicare (CMS data updated 2026-10-02).
- 3075 N Reserve St, Suite FMissoula, MT 59808 (406) 721‑4646
- 316 S 24th St W, Suite B101Billings, MT 59102 (406) 652‑7297
Group practices
Medicare enrollment lists Gregory G. Zell as a member of this group (CMS data updated 2026-10-02).
- Shoptikal LLC189 clinicians in the group
Specialties
- Optometryprimary
Other optometrists in Missoula
Clinicians with the same Medicare primary specialty in Missoula, MT — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Medical school | Southern California College Of Optometry |
| Graduation year | 1981 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1679534705 |
| 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