Registry data as of Aug 27, 2026

Darin Harnisch, M.D.

Specialist · Niles, IL

Darin Harnisch, M.D. is a specialist with a practice address in Niles, Illinois, and NPI 1710910880, issued on Jul 9, 2006. Check the license with the Illinois board that licenses this profession; the Medicare figures below come from public CMS files.

Record from CMS NPPES, loaded Aug 27, 2026 · Medicare files 2023 and 2024 · method · Verify with CMS →

NPPES recordas of Aug 27, 2026
1710910880
Name
Darin Harnisch
Credential
M.D.
Primary taxonomy
Specialist 174400000X
Practice location
7900 N Milwaukee Ave, Niles, IL 60714
Phone
(847) 663-9400
Enumerated
Jul 9, 2006
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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Also registered at 7900 N Milwaukee Ave

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Kayla Barango, MSN, APRN, FNP-CFamily Nurse Practitioner1912676123
  2. Ellen Brull, M.D.Family Medicine Physician1043396419
  3. Donna DziengielPharmacist1598114209
  4. Juan Engel, MDGastroenterology Physician1225122393
  5. Walter Falkowski, MDUrology Physician1124067335
  6. Debra Haley, PHDClinical Psychologist1306948690

Verify Darin Harnisch in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich Illinois board licenses this professionCheck the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
Find the Illinois license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

75% fewer Medicare Part D claims than the average specialist in 2024

382 Medicare Part D claims for 94 beneficiaries, against an average of 1,524 among the 12,477 providers of this specialty who prescribed in Part D. Brand-name drugs were 30% of claims.

  1. Darin Harnisch382
  2. Specialty average1,524

Most prescribed

  1. Doxycycline Hyclate60 claims
  2. Descovy27 claims
  3. Cefadroxil24 claims
  4. Amoxicillin-Clavulanate Potass19 claims
  5. Ethambutol Hcl18 claims
  6. Rifampin18 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.

One hospital or facility affiliation

  1. Northwest Infectious Disease Consultants, S.C.Niles, IL

Source: CMS Doctors and Clinicians affiliations; Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.

Specialist providers in Illinois

There are 1,419 specialist records in Illinois.

All 1,419 in Illinois → Every provider in Niles →

Other specialist records in Illinois

  1. Sandra . Drewes, MDWinfield, IL1518056670
  2. Laketa AaronBellwood, IL1508508490
  3. Carrie Abbott-Walk, M.ED, DTDekalb, IL1841496171
  4. Suhair Abdel-Jalil, MDEvanston, IL1174572929
  5. Babak Abdollahshamshirsaz, M.D.Chicago, IL1447585765
  6. Syed Abdul-Aziz, MDBelleville, IL1114906005
  7. Steven Abern, M.D.Park Ridge, IL1922027424
  8. Richard AbramsChicago, IL1003992413
  9. Cherie AdamsEvanston, IL1063645810
  10. Robyn AdamsHerrin, IL1245216282

Common questions

What is Darin Harnisch, M.D.'s NPI number?

Darin Harnisch, M.D.'s National Provider Identifier (NPI) is 1710910880, issued on Jul 9, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Darin Harnisch, M.D. located?

The NPPES record lists a practice address at 7900 N Milwaukee Ave, Niles, IL, 60714. Phone: (847) 663-9400. Providers update this record themselves, so call before visiting.

How can I verify Darin Harnisch, M.D.'s license?

Search the Illinois board that licenses this profession; the NPPES record confirms identity only.

How much does Darin Harnisch, M.D. prescribe under Medicare Part D?

In 2024, Darin Harnisch, M.D. had 382 Medicare Part D claims for 94 beneficiaries; the average among specialist prescribers was 1,524. Part D covers Medicare prescriptions only.

Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 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.

Compiled from official public sources by the editorial process.

Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.