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IAN CLARK MD
NPI 1669985958
Pathology - Anatomic Pathology & Clinical Pathology in Evanston, IL

Active since November 09, 2017PECOS EnrolledAccepts Medicare Assignment
93.08/100
CMS Quality Rating
2650 RIDGE AVE, EVANSTON, IL 60201(847) 570-2132(847) 570-2927 Get Directions Write a Review

NPPES record last updated: September 2, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Sep 2, 2026, Oct 8, 2018, Nov 9, 2017 (3 updates tracked since 2017).

About Ian Clark Md NPPES

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

IAN CLARK MD (NPI 1669985958) is an individual anatomic pathology & clinical pathology provider in Evanston, Illinois, licensed in Illinois (036161858) and active in the NPI registry since November 2017. He is enrolled in Medicare PECOS, is affiliated with Northshore University Healthsystem - Evanston Hospital, and is a graduate of Other (1996).

NPPES Registry Identity

NPI1669985958
Entity TypeIndividualMale
Primary Taxonomy207ZP0102X
Provider Legal NameIAN CLARKCredential: MD
Location Address2650 RIDGE AVEEvanston, IL 60201-1700
Mailing Address4901 Searle Pkwy Ste 150Skokie, IL 60077-5320 · (847) 982-3363 · Fax (847) 733-5315
Phone(847) 570-2132
Fax(847) 570-2927
Sole ProprietorNo
Medical School CMSOtherGraduated 1996
Enumeration DateNovember 9, 2017
Last NPPES UpdateSeptember 2, 20263 updates tracked since enumeration
NPPES CertifiedSeptember 2, 2026
✔ NPI 1669985958 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPathology · Anatomic Pathology & Clinical PathologyAllopathic & Osteopathic Physicians
Taxonomy Code207ZP0102X
Licenses✔ Licensed in IL · 036161858✔ Licensed in TN · 56522
Definition
A pathologist deals with the causes and nature of disease and contributes to diagnosis, prognosis and treatment through knowledge gained by the laboratory application of the biologic, chemical and physical sciences. A pathologist uses information gathered from the microscopic examination of tissue specimens, cells and body fluids, and from clinical laboratory tests on body fluids and secretions for the diagnosis, exclusion and monitoring of disease.
2650 RIDGE AVE, Evanston, IL 60201
Open in Google Maps ↗

Other Identifiers 1

MedicaidQ033048TN

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter Health and more.Insurance ›

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

Ian Clark Md 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 ID1951661438
PECOS Enrollment IDI20220831003606
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 Ian Clark reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Endeavor Health Medical Group
Same address
Anesthesiology
2650 RIDGE AVE, ANESTHESIOLOGY ROOM 3905
Evanston, IL 60201
  • Reassigned Medicare billing, Illinois enrollment
  • 4,841 clinicians in this Medicare group
NPI 1265695944 (847) 570-2760

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 9

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.

Pathology examination of tissue using a microscope, intermediate complexity 88305
A pathology examination of tissue with intermediate complexity involves studying a small sample of your body tissue under a microscope. This helps in identifying any abnormal cells or signs of disease. It's a detailed process requiring expert analysis to ensure accurate results.
1,959 services866 patients
Special stained specimen slides to examine tissue, initial procedure 88342
This procedure involves the use of specially stained slides to examine tissue samples. The initial process involves obtaining a small tissue sample from your body. This sample is then placed on a slide and stained with special dyes to highlight different structures and elements. The stained slide is then examined under a microscope to help diagnose any potential health issues.
176 services149 patients
Special stained specimen slides to examine tissue including interpretation and report 88313
Special stained specimen slides are used to examine tissue samples. This involves applying special dyes to the tissue, which helps to highlight certain features under a microscope. The findings are then interpreted and a report is provided. This can aid in diagnosing various health conditions.
156 services42 patients
Special stained specimen slides to examine tissue, each additional procedure 88341
Special stained specimen slides are used to analyze tissue in detail. In this process, extra procedures may be needed for a more thorough examination. These involve applying special stains to the tissue on slides, enhancing specific elements for closer study.
118 services39 patients
Pathology examination of tissue using a microscope, moderately high complexity 88307
A pathology examination of tissue with moderate complexity involves a detailed study of a small tissue sample from your body. Using a microscope, experts analyze the tissue's structure and cells to identify any abnormalities. This helps in diagnosing various health conditions accurately.
74 services66 patients
Pathology examination of tissue using a microscope, moderately low complexity 88304
A pathology examination of tissue, moderately low complexity, involves studying a small sample of your body tissue under a microscope. It helps to identify any abnormal cells or diseases. It's a routine procedure, not complex, and provides crucial insights for your diagnosis.
65 services65 patients

Hospital Affiliations CMS Care Compare 2

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Northshore University Healthsystem - Evanston Hospital

Acute Care Hospitals · Evanston, IL
5/5 CMS rating
OwnershipVoluntary non-profit - Other
CMS Certification Number140010
Location2650 Ridge AveEvanston, IL 60201 · Cook County
Emergency services Birthing friendly

Swedish Hospital

Acute Care Hospitals · Chicago, IL
2/5 CMS rating
OwnershipVoluntary non-profit - Church
CMS Certification Number140114
Location5145 N California AveChicago, IL 60625 · Cook County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60201 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
$138.86 typical visit price
range $60.08 – $183.39
Typical copayment $34.71 (range $15.02 – $45.84)
Most-billed visit code 99204
Established Patient
$105.70 typical visit price
range $18.97 – $148.12
Typical copayment $26.42 (range $4.74 – $37.03)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

93.08/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored through an Alternative Payment Model
Quality80.79
Promoting Interoperability100
Improvement Activities40

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.

DR. THOMAS LEE CIBULL M.D.
Pathology (Anatomic Pathology & Clinical Pathology)
2650 RIDGE AVE, EVANSTON HOSPITAL
EVANSTON, IL 60201
Cook County (847) 570-2040
LAUREN ANDERSON MD
Hospitalist
2650 RIDGE AVE
EVANSTON, IL 60201
Cook County (847) 570-1027
DR. DANIEL K. WEST MD
Radiology (Diagnostic Radiology)
2650 RIDGE AVE, DEPARTMENT OF RADIOLOGY, G507
EVANSTON, IL 60201
Cook County (847) 570-2475
JOEL BERNSTEIN M.D.
Radiology (Diagnostic Radiology)
2650 RIDGE AVE, EVANSTON HOSPITAL
EVANSTON, IL 60201
Cook County (847) 570-1206
MATTHEW R. SHERWOOD MD
Internal Medicine
2650 RIDGE AVE, DIVISION OF INTERNAL MEDICINE RM 4324
EVANSTON, IL 60201
Cook County (847) 570-1010
MICHAEL T. GILLAM M.D.
Emergency Medicine
2650 RIDGE AVE, EMERGENCY MEDICINE RM G909
EVANSTON, IL 60201
Cook County (847) 570-2114
MARLENE ANGELICO CNP
Nurse Practitioner (Acute Care)
2650 RIDGE AVE, EMERGENCY MEDICINE, RM G903C
EVANSTON, IL 60201
Cook County (847) 570-1355
MINA KEROLOS MD
Hospitalist
2650 RIDGE AVE
EVANSTON, IL 60201
Cook County (847) 570-1010

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 Ian Clark's NPI number?

The NPI number for Ian Clark is 1669985958. It was assigned to this individual provider in the NPPES registry on November 9, 2017.

Where is Ian Clark located?

Ian Clark practices at 2650 Ridge Ave, Evanston, IL 60201. The listed phone number is (847) 570-2132.

What is Ian Clark's specialty?

The primary specialty registered for this NPI is Pathology, specializing in Anatomic Pathology & Clinical Pathology, with taxonomy code 207ZP0102X.

Is Ian Clark enrolled in Medicare?

Yes. Ian Clark 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 Ian Clark's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ian Clark reassigns Medicare benefits to Endeavor Health Medical Group (Evanston, 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 Ian Clark's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Ian Clark accept?

Health plans from Ambetter Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter of Alabama and Ambetter of Tennessee list Ian Clark as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Ian Clark affiliated with any hospitals?

According to CMS data, Ian Clark is affiliated with Northshore University Healthsystem - Evanston Hospital and Swedish Hospital.

When was this NPI record last updated?

The NPPES record for Ian Clark was last updated on September 2, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 months 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.