Quick answers
- Where does Mark A. Berk see patients?
- Medicare's clinician data lists 1 practice location in Lake Forest, IL. Call before your visit to confirm the address.
- What is Mark A. Berk's specialty?
- Medicare lists Dermatology as the primary specialty.
- Does Mark A. Berk accept Medicare assignment?
- Yes. Medicare's clinician data says Mark A. Berk 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 Mark A. Berk?
- (847) 234-6121, as listed in official Medicare / NPI Registry data.
- What is Mark A. Berk's NPI number?
- 1235196858. 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 Mark A. Berk is enrolled with Medicare (CMS data updated 2026-10-02).
- 225 E Deerpath, Suite 50Lake Forest, IL 60045 (847) 234‑6121
Group practices
Medicare enrollment lists Mark A. Berk as a member of this group (CMS data updated 2026-10-02).
- Dermatologists of Illinois, PLLC12 clinicians in the group
Specialties
- Dermatologyprimary
Other dermatologists in Lake Forest
Clinicians with the same Medicare primary specialty in Lake Forest, IL — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1981 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1235196858 |
| 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