Mark Allan Berk, M.D.
Dermatology Physician · Lake Forest, IL
Mark Allan Berk, M.D. is a dermatology physician with a practice address in Lake Forest, Illinois, and NPI 1235196858, issued on Apr 27, 2006. Check the license (Illinois 036068947, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Mark Allan Berk
- Credential
- M.D.
- Primary taxonomy
- Dermatology Physician 207N00000X
- License number
- 036068947 IL
Self-reported in NPPES; status is on the state search - Practice location
- 900 N Westmoreland RD, Lake Forest, IL 60045
- Phone
- (847) 234-6121
- Enumerated
- Apr 27, 2006
- Record last updated
- Jan 26, 2010 (not updated in 16 years: call before relying on the address or phone)
- Fax
- (847) 482-0363
- Medicaid ID
- 036068947 IL
- Medicare enrollment
- Enrolled (PECOS I20041011000073); accepts Medicare assignment
- Entity
- Type 1 · individual
Also registered at 900 N Westmoreland RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jennifer Capezio, MDRheumatology Physician1528023058
- Tanner Colegrove, M.D.Obstetrics & Gynecology Physician1003941113
- Patricia Craig, CPNPPediatric Nurse Practitioner1932138351
- James Devine, PHDClinical Psychologist1376520312
- Andreea DraghiciPhysical Therapy Assistant1750961157
- Amy Fitzpatrick, CPNPPediatric Nurse Practitioner1639107832
Verify Mark Allan Berk in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036068947Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.3 times the Medicare Part D claims of the average dermatology physician in 2024
1,822 Medicare Part D claims for 799 beneficiaries, against an average of 797 among the 12,802 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims.
Most prescribed
- Mupirocin223 claims
- Ketoconazole188 claims
- Fluticasone Propionate141 claims
- Triamcinolone Acetonide128 claims
- Betamethasone Dipropionate110 claims
- Clobetasol Propionate107 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $266.91
8 payments; by number, the most common kind was food and beverage; the largest payer was Janssen Biotech, Inc. The 10,250 providers of this specialty with any payment received $8,544.61 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Dermatologists OF Illinois, PLLCLake Forest, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Dermatology Physician providers in Illinois
There are 647 dermatology physician records in Illinois.
Other dermatology physician records in Illinois
- Kelly Abate, M.D.New Lenox, IL1528141116
- Cynthia Abban, MD/PHDGurnee, IL1841556735
- Nadine Abouchaleh, MDSchaumburg, IL1265173736
- Melissa Abrams, M.D.Vernon Hills, IL1023284635
- Beth Adams, M.D.Chicago, IL1376751255
- Sarah Adams, MDChicago, IL1366784910
- Ademola Adeoshun, MDOak Lawn, IL1609579812
- Oyinade Aderibigbe, M.D.Chicago, IL1366823544
- Motunrayo Adisa, M.DKenilworth, IL1326229121
- Prachi AggarwalChicago, IL1770129751
Common questions
What is Mark Allan Berk, M.D.'s NPI number?
Mark Allan Berk, M.D.'s National Provider Identifier (NPI) is 1235196858, issued on Apr 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Allan Berk, M.D. located?
The NPPES record lists a practice address at 900 N Westmoreland RD, Lake Forest, IL, 60045. Phone: (847) 234-6121. Providers update this record themselves, so call before visiting.
How can I verify Mark Allan Berk, M.D.'s license?
NPPES lists Illinois license number 036068947, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark Allan Berk, M.D. prescribe under Medicare Part D?
In 2024, Mark Allan Berk, M.D. had 1,822 Medicare Part D claims for 799 beneficiaries; the average among dermatology physician prescribers was 797. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.