Quick answers
- Where does Grant Justin see patients?
- Medicare's clinician data lists 2 practice locations, including Frederick, MD and Hagerstown, MD. Call before your visit to confirm the address.
- What is Grant Justin's specialty?
- Medicare lists Ophthalmology as the primary specialty.
- Does Grant Justin accept Medicare assignment?
- Yes. Medicare's clinician data says Grant Justin 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 Grant Justin?
- (301) 228-2946, as listed in official Medicare / NPI Registry data.
- What is Grant Justin's NPI number?
- 1891144515. 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 Grant Justin is enrolled with Medicare (CMS data updated 2026-10-02).
- 174 Thomas Johnson Dr, Suite 204Frederick, MD 21702 (301) 228‑2946
- 246 Eastern Blvd N, Suite 102Hagerstown, MD 21740 (301) 671‑2400
Group practices
Medicare enrollment lists Grant Justin as a member of this group (CMS data updated 2026-10-02).
- Robert E Parnes MD LLC4 clinicians in the group
Specialties
- Ophthalmologyprimary
Other ophthalmologists in Frederick
Clinicians with the same Medicare primary specialty in Frederick, MD — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Uniformed Services Uhs Fe Hebert School Of Med |
| Graduation year | 2016 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1891144515 |
| 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