Quick answers
- Where does James B. Grossweiner see patients?
- Medicare's clinician data lists 1 practice location in Naperville, IL. Call before your visit to confirm the address.
- What is James B. Grossweiner's specialty?
- Medicare lists Dermatology as the primary specialty.
- Does James B. Grossweiner accept Medicare assignment?
- Yes. Medicare's clinician data says James B. Grossweiner 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 James B. Grossweiner's NPI number?
- 1437114907. 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 James B. Grossweiner is enrolled with Medicare (CMS data updated 2026-10-02).
- 120 Spalding Dr, Suite 405Naperville, IL 60540
Specialties
- Dermatologyprimary
Other dermatologists in Naperville
Clinicians with the same Medicare primary specialty in Naperville, IL — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | R Franklin University Of Med & Sci/chicago Medical School |
| Graduation year | 1985 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1437114907 |
| 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