Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. Dara Grennan

Individual provider Internal Medicine Physician · NPI 1518282938

Dr. Dara Grennan is a Hospitalist in Dixon, Illinois. Qualified in 2007, 19 years ago. Practices with Northwestern Medical Faculty Foundation, a 4,394-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Illinois and Utah.

Years since qualifying
19
Licensed in
IL, UT
In the registry since
2010
Specialties on file
4
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Practice location Address checks out

403 E 1st St
Dixon, IL 61021
Phone: (815) 285-5629
Fax: (815) 285-5634
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 5121 S Cottonwood St, Salt Lake City, UT 84107-5701 — (801) 507-4384

Specialties & licences

Infectious Disease Physician (primary) Taxonomy 207RI0200X · Licence 036-137502 (IL)
Internal Medicine Physician Taxonomy 207R00000X · Licence 036-137502 (IL)
Hospitalist Physician Taxonomy 208M00000X · Licence 8153445 (UT)
Hospitalist Physician Taxonomy 208M00000X · Licence 36.137502 (IL)

Record details

NPI number1518282938
Entity typeIndividual (Type 1)
GenderFemale
Sole proprietorNo
NPI enumeratedMarch 29, 2010
Last updated in NPPESApril 26, 2021
Certification dateApril 26, 2021

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyHOSPITALIST
Also practisesINFECTIOUS DISEASE, INTERNAL MEDICINE
Medical schoolOTHER
Graduated 2007 (19 years in practice)
Group practice Northwestern Medical Faculty Foundation — 4394 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients38
Services billed 55 a service is one billed item, such as a visit, a test or a procedure
Average patient age71

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Northwestern Medical Faculty Foundation

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 4394 clinicians in the practice; 12 are shown here.

Other providers in Dixon