Mark Berk, M.D.
NPI 1235196858 · Dermatology Physician · Lake Forest, IL
Enrolled with Medicare as Practitioner - Dermatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Berk, M.D. is a Dermatology Physician provider in Lake Forest, IL (NPI 1235196858).
Provider details
- NPI number
- 1235196858
- Entity type
- Individual
- Primary specialty
- Dermatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 036068947 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
6,627 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 1,842 | $94 |
| Destruction of Precancer Skin Growth, 2-14 Growths17003 | 1,328 | $7 |
| Destruction of Precancer Skin Growth, 1 Growth17000 | 696 | $48 |
| Destruction of Skin Growth, 1-14 Growths17110 | 688 | $100 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 342 | $132 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 33 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Mupirocin | 223 | 169 |
| Ketoconazole | 188 | 109 |
| Fluticasone Propionate | 141 | 111 |
| Triamcinolone Acetonide | 128 | 95 |
| Betamethasone Dipropionate | 110 | 73 |
| Clobetasol Propionate | 107 | 79 |
| Mometasone Furoate | 70 | 64 |
| Minoxidil | 65 | 28 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$267 across 8 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-04-27
- Last updated
- 2010-01-26
Frequently asked questions
- What is Mark Berk's NPI number?
- Mark Berk's National Provider Identifier (NPI) is 1235196858, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Berk's specialty?
- Mark Berk is listed in the NPPES registry with a primary specialty of Dermatology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Berk located?
- Mark Berk's practice location on file with NPPES is 900 N Westmoreland Rd, Lake Forest, IL 60045-1674.
- What is Mark Berk's phone number?
- The practice phone number listed in the NPPES registry for Mark Berk is (847) 234-6121.
- Does Mark Berk accept Medicare?
- Mark Berk is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Berk's NPI active?
- Yes — Mark Berk's NPI (1235196858) is active in the NPPES registry as of the last update on 2010-01-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.