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DR. DARIN O'CONNOR HARNISCH M.D.
NPI 1710910880
Specialist in Niles, IL

Active since July 09, 2006PECOS Enrolled
7900 N MILWAUKEE AVE, STE 231, NILES, IL 60714(847) 663-9400(847) 663-9827 Get Directions Write a Review

NPPES record last updated: December 20, 2021. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Dr. Darin O'connor Harnisch M.d. NPPES

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

DR. DARIN O'CONNOR HARNISCH M.D. (NPI 1710910880) is an individual specialist in Niles, Illinois, licensed in Illinois (036-106895) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS, is affiliated with Amita Health Resurrection Medical Center, and is a graduate of Loyola University Of Chicago, Stritch School Of Medicine (1998).

NPPES Registry Identity

NPI1710910880
Entity TypeIndividualMale
Primary Taxonomy174400000X
Provider Legal NameDR. DARIN O'CONNOR HARNISCHCredential: M.D.
Location Address7900 N MILWAUKEE AVE, STE 231Niles, IL 60714-3159
Mailing Address7900 N Milwaukee Ave, Ste 231Niles, IL 60714-3159
Phone(847) 663-9400
Fax(847) 663-9827
Sole ProprietorNo
Medical School CMSLoyola University Of Chicago, Stritch School Of MedicineGraduated 1998
Enumeration DateJuly 9, 2006
Last NPPES UpdateDecember 20, 2021
NPPES CertifiedDecember 20, 2021
✔ NPI 1710910880 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySpecialistOther Service Providers
Taxonomy Code174400000X
License✔ Licensed in IL · 036-106895
Definition
An individual educated and trained in an applied knowledge discipline used in the performance of work at a level requiring knowledge and skills beyond or apart from that provided by a general education or liberal arts degree.
7900 N MILWAUKEE AVE, Niles, IL 60714
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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Darin O'connor Harnisch M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID8022095728
PECOS Enrollment IDI20040701000128
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 Darin Harnisch reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Northwest Infectious Disease Consultants, S.C.
0.1 mi
Infectious Disease
7900 N MILWAUKEE AVE, SUITE 231
Niles, IL 60714
  • Reassigned Medicare billing, Illinois enrollment
  • 10 clinicians in this Medicare group
NPI 1194775221 (847) 663-9400

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 6

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.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
1,221 services534 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
647 services321 patients
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222
Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.
174 services171 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
155 services147 patients
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.
46 services28 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.
41 services31 patients

Hospital Affiliations CMS Care Compare 2

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

Amita Health Resurrection Medical Center

Acute Care Hospitals · Chicago, IL
4/5 CMS rating
OwnershipVoluntary non-profit - Church
CMS Certification Number140117
Location7435 W Talcott AvenueChicago, IL 60631 · Cook County
Emergency services Birthing friendly

Advocate Lutheran General Hospital

Acute Care Hospitals · Park Ridge, IL
5/5 CMS rating
OwnershipVoluntary non-profit - Church
CMS Certification Number140223
Location1775 Dempster StPark Ridge, IL 60068 · Cook County
Emergency services Birthing friendly

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.

KIRILL ZHADOVICH M.D.
Internal Medicine
7900 N MILWAUKEE AVE, SUITE 2-24
NILES, IL 60714
Cook County (847) 825-0800
FAMILY MEDICINE ASSOCIATES OF LUTHERAN GENERAL S C
Family Medicine
7900 N MILWAUKEE AVE, SUITE 233
NILES, IL 60714
Cook County (847) 967-9660
DR. MICHAEL JOHN MEYER D.O.
Family Medicine
7900 N MILWAUKEE AVE, SUITE 2-23
NILES, IL 60714
Cook County (847) 966-9878
ELLEN S BRULL M.D.
Family Medicine
7900 N MILWAUKEE AVE
NILES, IL 60714
Cook County (847) 967-9660
NORTHWEST SUBURBAN FAMILY PHYSICIAN LLC
Family Medicine
7900 N MILWAUKEE AVE, STE 234
NILES, IL 60714
Cook County (847) 966-1750
DR. BARBARA A LASKOWSKI DDS
Dentist
7900 N MILWAUKEE AVE, SUITE 230A
NILES, IL 60714
Cook County (847) 966-9000
KRYSTYNA WAGENHEJM CIESIELSKI DDS PC
Dentist
7900 N MILWAUKEE AVE, STE 2-21B
NILES, IL 60714
Cook County (847) 581-9400
WALTER S FALKOWSKI MD
Urology
7900 N MILWAUKEE AVE, SUITE 17
NILES, IL 60714
Cook County (847) 470-0297

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 Darin Harnisch's NPI number?

The NPI number for Darin Harnisch is 1710910880. It was assigned to this individual provider in the NPPES registry on July 9, 2006.

Where is Darin Harnisch located?

Darin Harnisch practices at 7900 N Milwaukee Ave Ste 231, Niles, IL 60714. The listed phone number is (847) 663-9400.

What is Darin Harnisch's specialty?

The primary specialty registered for this NPI is Specialist with taxonomy code 174400000X.

Is Darin Harnisch enrolled in Medicare?

Yes. Darin Harnisch is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Darin Harnisch's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Darin Harnisch reassigns Medicare benefits to Northwest Infectious Disease Consultants, S.C. (Niles, 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 Darin Harnisch's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Darin Harnisch affiliated with any hospitals?

According to CMS data, Darin Harnisch is affiliated with Amita Health Resurrection Medical Center and Advocate Lutheran General Hospital.

When was this NPI record last updated?

The NPPES record for Darin Harnisch was last updated on December 20, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.