DR. MARK ALLAN BERK M.D.
NPI 1235196858
Dermatology in Lake Forest, IL

Q: What is Mark Berk's NPI number?

The NPI number for Mark Berk is 1235196858. It was assigned to this individual provider in the NPPES registry on April 27, 2006.

Q: What is Mark Berk's specialty?

The primary specialty registered for this NPI is Dermatology with taxonomy code 207N00000X.

Q: When was this NPI record last updated?

The NPPES record for Mark Berk was last updated on January 26, 2010. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since April 27, 2006PECOS EnrolledAccepts Medicare Assignment

900 N WESTMORELAND RD, SUITE 222, LAKE FOREST, IL 60045(847) 234-6121(847) 482-0363 Get Directions Write a Review

NPPES record last updated: January 26, 2010. Verified against the NPPES registry weekly; last sync: October 25, 2026.

On this page

About Dr. Mark Allan Berk M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MARK ALLAN BERK M.D. (NPI 1235196858) is an individual dermatology provider in Lake Forest, Illinois, licensed in Illinois (036068947) and active in the NPI registry since April 2006. He is enrolled in Medicare PECOS and is a graduate of Other (1981).

NPPES Registry Identity

NPI1235196858

Entity TypeIndividualMale

Primary Taxonomy207N00000X

Provider Legal NameDR. MARK ALLAN BERKCredential: M.D.

Location Address900 N WESTMORELAND RD, SUITE 222Lake Forest, IL 60045-1674

Mailing Address900 N Westmoreland Rd, Suite 222Lake Forest, IL 60045-1674 · (847) 234-6121 · Fax (847) 482-0363

Phone(847) 234-6121

Fax(847) 482-0363

Sole ProprietorYes

Medical School CMSOtherGraduated 1981

Enumeration DateApril 27, 2006

Last NPPES UpdateJanuary 26, 2010

✔ NPI 1235196858 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyDermatologyAllopathic & Osteopathic Physicians

Taxonomy Code207N00000X

License✔ Licensed in IL · 036068947

Definition

A dermatologist is trained to diagnose and treat pediatric and adult patients with benign and malignant disorders of the skin, mouth, external genitalia, hair and nails, as well as a number of sexually transmitted diseases. The dermatologist has had additional training and experience in the diagnosis and treatment of skin cancers, melanomas, moles and other tumors of the skin, the management of contact dermatitis and other allergic and nonallergic skin disorders, and in the recognition of the skin manifestations of systemic (including internal malignancy) and infectious diseases. Dermatologists have special training in dermatopathology and in the surgical techniques used in dermatology. They also have expertise in the management of cosmetic disorders of the skin such as hair loss and scars and the skin changes associated with aging.

900 N WESTMORELAND RD, Lake Forest, IL 60045

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Other Identifiers 3

Medicare UPINC39596IL

Medicare ID-Type Unspecified209949IL · Provider Medicare Id Numb

Medicaid036068947IL

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Mark Allan Berk M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID3971562448

PECOS Enrollment IDI20041011000073

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Mark Berk reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Dermatologists Of Illinois, PLLC

1.3 mi

Dermatology

225 E DEERPATH STE 50
Lake Forest, IL 60045

Reassigned Medicare billing, Illinois enrollment
9 clinicians in this Medicare group

NPI 1851358345 (847) 234-6121

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 38

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

1,842 services1,193 patients

Destruction of precancer skin growth, 2-14 growths 17003

This procedure involves removing 2-14 precancerous skin growths. The growths are treated to prevent them from potentially developing into skin cancer. The process is safe, with minimal discomfort, and promotes healthier skin.

1,328 services306 patients

Destruction of precancer skin growth, 1 growth 17000

"Destruction of precancer skin growth" is a procedure that eliminates a single precancerous skin growth. This is done to prevent it from developing into skin cancer. The growth may be removed using various methods such as cryotherapy (freezing), laser therapy, or topical medications.

696 services511 patients

Destruction of skin growth, 1-14 growths 17110

"Destruction of skin growth" refers to a procedure where 1-14 abnormal skin growths are removed. This is done using methods such as freezing, burning, or laser therapy. It helps prevent the growth from causing discomfort or turning into a more serious condition.

688 services537 patients

Injection, triamcinolone acetonide, not otherwise specified, 10 mg J3301

Triamcinolone acetonide is a medication used to reduce inflammation in the body. It's given as a 10 mg injection for conditions like allergies, arthritis, or skin problems. The injection helps to decrease swelling, redness, and itching.

427 services78 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

342 services251 patients

New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203

This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.

247 services247 patients

Shaving of skin growth of body, arms, or legs, 0.6-1.0 cm 11301

This procedure involves the careful removal of a small skin growth on the body, arms, or legs. It's done by shaving off the growth that's 0.6-1.0 cm in size. It's a common, safe method to treat non-cancerous skin growths and improve skin appearance.

213 services179 patients

Shaving of skin growth of face, ears, eyelids, nose, lips, or mouth, 0.6-1.0 cm 11311

This procedure involves removing a small skin growth on the face or related areas like the ears, eyelids, nose, lips, or mouth. The growth is gently shaved off, typically under local anesthesia. It's a quick, safe process for growths between 0.6-1.0 cm in size.

145 services128 patients

Shaving of skin growth of body, arms, or legs, 1.1-2.0 cm 11302

This procedure involves the careful removal of a skin growth on your body, arms, or legs. The growth is between 1.1 and 2.0 cm. A special tool is used to shave off the growth, which is a quick and relatively painless process.

142 services124 patients

Injection of drug or substance under skin or into muscle 96372

This procedure involves administering medication directly under the skin or into a muscle. A small needle is used to inject the drug, allowing it to be absorbed quickly into the bloodstream. It's a common method for delivering a variety of medications.

101 services63 patients

Punch biopsy, first skin growth 11104

A punch biopsy is a procedure where a small, circular tool is used to remove a sample of skin tissue. This is usually done to test a skin growth for potential issues. You may feel a pinch, but discomfort is minimal. The area heals quickly.

95 services92 patients

Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more 99212

This is a routine check-up for patients who have previously seen the doctor. During this 10-19 minute visit, the doctor will review your health status, discuss any concerns, and manage ongoing treatments or medications. It's a chance to ensure your health is on track.

92 services84 patients

Shaving of skin growth of scalp, neck, hands, feet, or genitals, 0.6-1.0 cm 11306

This procedure involves the careful removal of a small skin growth, between 0.6-1.0 cm in size, from the scalp, neck, hands, or feet. It's done using a special tool to gently shave off the growth, ensuring minimal discomfort.

78 services69 patients

Shaving of skin growth of face, ears, eyelids, nose, lips, or mouth, 1.1-2.0 cm 11312

This procedure involves the careful removal of a skin growth on the face, ears, eyelids, nose, lips, or mouth. The growth being treated is between 1.1 and 2.0 cm in size. The process is typically quick, with minimal discomfort, and aids in maintaining skin health.

75 services68 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

52 services52 patients

Biopsy of related skin growth, first growth 11102

A biopsy of a skin growth involves taking a small sample of the growth to examine it under a microscope. This helps determine if the growth is harmful. The procedure is typically quick, with minimal discomfort. It's a crucial step in ensuring your skin's health.

50 services49 patients

Destruction of cancer skin growth of trunk, arms, or legs, 1.1-2.0 cm 17262

This procedure involves removing a cancerous skin growth on the trunk, arms, or legs that is between 1.1 and 2.0 cm in size. The growth is destroyed using methods like surgery, laser, or freezing, aiming to eliminate cancer and prevent its spread.

46 services41 patients

Shaving of skin growth of face, ears, eyelids, nose, lips, or mouth, 0.5 cm or less 11310

This procedure involves the careful removal of a small skin growth on the face or related areas. A medical professional uses a special tool to gently shave off the growth, which is 0.5 cm or less. It's a common, safe procedure.

38 services37 patients

Shaving of skin growth of scalp, neck, hands, feet, or genitals, 1.1-2.0 cm 11307

This procedure involves the careful removal of a skin growth between 1.1 to 2.0 cm in size. The growth could be located on the scalp, neck, hands, or feet. The process is done using a sharp instrument to shave off the growth, promoting healthier skin.

33 services30 patients

Shaving of skin growth of body, arms, or legs, 0.5 cm or less 11300

This is a simple procedure where a small skin growth on your body, arms, or legs, measuring 0.5 cm or less, is carefully shaved off. It's typically quick, with minimal discomfort. It helps to prevent any potential health issues related to the growth.

30 services28 patients

Shaving of skin growth of body, arms, or legs, more than 2.0 cm 11303

This procedure involves the removal of a skin growth on your body, arms, or legs that is over 2.0 cm. A special tool is used to shave off the growth, often under local anesthesia. It's a routine, safe process to maintain skin health.

28 services25 patients

Injection into skin growth, 1-7 growths 11900

This procedure involves injecting medication into 1-7 skin growths. The medication helps to reduce the size of the growths or completely eliminate them. It's a simple, quick, and usually painless process performed by a medical professional.

25 services21 patients

Destruction of cancer skin growth of trunk, arms, or legs, 2.1-3.0 cm 17263

This procedure targets and eliminates a cancerous skin growth between 2.1 and 3.0 cm on your trunk, arms, or legs. It's done by applying specific treatments like heat, cold, or medicated creams to destroy the cancer cells, preventing them from spreading.

25 services24 patients

Aminolevulinic acid hcl for topical administration, 20%, single unit dosage form (354 mg) J7308

Aminolevulinic Acid HCL is a medication applied to the skin to treat certain types of skin conditions. It works by making the skin more sensitive to light, which helps to kill abnormal skin cells. The 20% solution is a single dose of 354 mg.

24 services22 patients

Intermediate repair of wound of scalp, underarms, trunk, arms, or legs, 2.5 cm or less 12031

This procedure involves the repair of a wound that is located on the scalp, underarms, trunk, arms, or legs and is 2.5 cm or less in size. The repair is intermediate, meaning it's more complex than a simple closure, but not as extensive as a complex repair.

23 services21 patients

Acne surgery 10040

Acne surgery is a procedure to clear up severe acne that doesn't respond to other treatments. It involves a dermatologist using specialized tools to remove blackheads, whiteheads, and pimples. This helps to reduce the appearance of acne and prevent future breakouts.

22 services22 patients

Intermediate repair of wound of scalp, underarms, trunk, arms, or legs, 2.6-7.5 cm 12032

This procedure involves the repair of a wound between 2.6-7.5 cm located on the scalp, underarms, trunk, arms, or legs. The process includes cleaning, debridement (removal of damaged tissue), and suturing (stitching) of the wound to promote healing.

21 services19 patients

Removal of noncancer skin growth of body, arms, or legs, 3.1-4.0 cm 11404

This procedure involves the removal of a noncancerous skin growth on your body, arms, or legs that measures between 3.1 and 4.0 cm. The growth is carefully cut away and the area is then cleaned and bandaged to promote healing.

19 services18 patients

Application of light with debridement to destroy precancer skin growth 96574

This procedure involves applying a special light source to the skin after removing dead tissue (debridement). The light helps destroy precancerous growths, preventing them from developing into skin cancer. It's a safe and effective method to keep your skin healthy.

19 services17 patients

Destruction of cancer skin growth of scalp, neck, hands, feet, or genitals, 1.1-2.0 cm 17272

This procedure involves the removal of a cancerous skin growth measuring 1.1-2.0 cm, located on the scalp, neck, hands, or feet. The process may involve techniques like surgery, laser, or cryotherapy. The aim is to eliminate the cancer cells and prevent further spread.

16 services16 patients

Incision biopsy, first skin growth 11106

An incision biopsy involves taking a small sample of a skin growth for further examination. A local anesthetic is used to numb the area, then a portion of the growth is removed using a surgical knife. This helps identify the nature of the growth.

15 services15 patients

Removal of skin tag, 1-15 skin tags 11200

Skin tag removal is a simple procedure where small, benign growths on the skin are carefully removed. This can be achieved through several methods such as freezing, burning, or cutting off the skin tags. The process is quick, typically painless with local anesthesia, and aids in skin smoothness.

15 services14 patients

Removal of noncancer skin growth of body, arms, or legs, 2.1-3.0 cm 11403

This is a procedure where a noncancerous skin growth, sized 2.1-3.0 cm, on the body, arms, or legs is removed. It's typically done under local anesthesia. The process involves cutting out the growth and stitching the skin back together. The aim is to eliminate discomfort and prevent potential health issues.

15 services15 patients

Destruction of cancer skin growth of face, ears, eyelids, nose, lips, or mouth, 1.1-2.0 cm 17282

This procedure involves the removal of a cancerous skin growth on the face, ears, eyelids, nose, lips, or mouth that measures between 1.1 to 2.0 cm. It's done to prevent the spread of cancer and improve health.

14 services12 patients

Destruction of cancer skin growth of trunk, arms, or legs, 3.1-4.0 cm 17264

This involves removing a cancerous skin growth on the trunk, arms, or legs that measures 3.1-4.0 cm. The procedure may use methods like surgery, lasers, or radiation to destroy the growth, helping to prevent cancer from spreading.

13 services13 patients

Shaving of skin growth of scalp, neck, hands, feet, or genitals, 0.5 cm or less 11305

This is a procedure where a small skin growth on the scalp, neck, hands, or feet, measuring 0.5 cm or less, is carefully removed. The process involves shaving off the growth layer by layer to ensure complete removal. It's a safe and common practice.

12 services12 patients

New patient office or other outpatient visit with straightforward medical decision making, if using time, 15 minutes or more 99202

This service involves an initial visit to the doctor's office or other outpatient setting. It typically lasts between 15-29 minutes. The doctor will review your medical history, conduct a physical examination, and discuss your health concerns. It's a chance to establish your health baseline and address any immediate medical issues.

12 services12 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60045 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$93.02 typical visit price

range $59.81 – $181.38

Typical copayment $23.25 (range $14.95 – $45.34)

Most-billed visit code 99203

Established Patient

$74.38 typical visit price

range $19.15 – $147.12

Typical copayment $18.59 (range $4.78 – $36.78)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

LAKE SHORE PEDIATRICS, LTD

Pediatrics

900 N WESTMORELAND RD, SUITE 106
LAKE FOREST, IL 60045

Lake County (847) 615-4654

TANNER L COLEGROVE M.D.

Obstetrics & Gynecology

900 N WESTMORELAND RD, SUITE # 207
LAKE FOREST, IL 60045

Lake County (847) 234-9110

MELISSA HILB CPNP

Nurse Practitioner (Pediatrics)

900 N WESTMORELAND RD, SUITE 110
LAKE FOREST, IL 60045

Lake County (847) 295-1220

NORTH SHORE RHEUMATOLOGY

Internal Medicine (Rheumatology)

900 N WESTMORELAND RD, SUITE 222
LAKE FOREST, IL 60045

Lake County (847) 234-6121

DR. DENISE VERGES MD

Internal Medicine (Rheumatology)

900 N WESTMORELAND RD, SUITE 222
LAKE FOREST, IL 60045

Lake County (847) 234-6121

NORTHWESTERN MEDICAL FACULTY FOUNDATION

Optometrist

900 N WESTMORELAND RD, LOWER LEVEL 88
LAKE FOREST, IL 60045

Lake County (847) 295-0001

JHAN CARLO FONTANILLA DPT

Physical Therapist

900 N WESTMORELAND RD
LAKE FOREST, IL 60045

Lake County (847) 535-6418

DR. REBECCA E JACOBSON MD

Obstetrics & Gynecology

900 N WESTMORELAND RD, STE 228
LAKE FOREST, IL 60045

Lake County (847) 234-3860

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Mark Berk's NPI number?

The NPI number for Mark Berk is 1235196858. It was assigned to this individual provider in the NPPES registry on April 27, 2006.

Where is Mark Berk located?

Mark Berk practices at 900 N Westmoreland Rd Suite 222, Lake Forest, IL 60045. The listed phone number is (847) 234-6121.

What is Mark Berk's specialty?

The primary specialty registered for this NPI is Dermatology with taxonomy code 207N00000X.

Is Mark Berk enrolled in Medicare?

Yes. Mark Berk is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Mark Berk's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mark Berk reassigns Medicare benefits to Dermatologists Of Illinois, PLLC (Lake Forest, IL). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Mark Berk's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Mark Berk was last updated on January 26, 2010. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.