Dr Dara Grennan, - Medicare Hospitalist in Dixon, IL

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Dr Dara Grennan, is a medicare enrolled "Internal Medicine - Infectious Disease" physician in Dixon, Illinois. She graduated from medical school in 2007 and has 17 years of diverse experience with area of expertise as Hospitalist. She is a member of the group practice Cook County, Northwestern Medical Faculty Foundation and her current practice location is 403 E 1st St, Dixon, Illinois. You can reach out to her office (for appointments etc.) via phone at (815) 285-5629.

Dr Dara Grennan is licensed to practice in Illinois (license number 036-137502) and she also participates in the medicare program. She accepts medicare assignments (which means she accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and her NPI Number is 1518282938.

Contact Information

Dr Dara Grennan,
403 E 1st St,
Dixon, IL 61021
(815) 285-5629
(815) 285-5634

Map and Direction




Physician's Profile

Full NameDr Dara Grennan
GenderFemale
SpecialityHospitalist
Experience17 Years
Location403 E 1st St, Dixon, Illinois
Accepts Medicare AssignmentsYes. She accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Dr Dara Grennan graduated from medical school in 2007
  NPI Data:
  • NPI Number: 1518282938
  • Provider Enumeration Date: 03/29/2010
  • Last Update Date: 04/26/2021
  Medicare PECOS Information:
  • PECOS PAC ID: 6507092962
  • Enrollment ID: I20171107000107

Medical Identifiers

Medical identifiers for Dr Dara Grennan such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1518282938NPI-NPPES
F400440732OtherILMEDICARE PTAN
036137502MedicaidIL

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine 036-137502 (Illinois)Secondary
208M00000XHospitalist 8153445 (Utah)Secondary
208M00000XHospitalist 36.137502 (Illinois)Secondary
207RI0200XInternal Medicine - Infectious Disease 036-137502 (Illinois)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Northwestern Lake Forest HospitalLake forest, ILHospital
John H Stroger Jr HospitalChicago, ILHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Cook County2860398088645
Northwestern Medical Faculty Foundation45875768143352

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Dr Dara Grennan allows following entities to bill medicare on her behalf.
Entity NameNorthwestern Medical Faculty Foundation
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1346235314
PECOS PAC ID: 4587576814
Enrollment ID: O20031105000541
Entity NameCook County
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1588612832
PECOS PAC ID: 2860398088
Enrollment ID: O20031209000747
Entity NameNorthshore University Healthsystem Faculty Practice Associates
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1497701882
PECOS PAC ID: 2163334699
Enrollment ID: O20040524000118

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Dr Dara Grennan is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Dr Dara Grennan,
680 N Lake Shore Dr,
Chicago, IL 60611-4546

Ph: (312) 956-8686		Dr Dara Grennan,
403 E 1st St,
Dixon, IL 61021

Ph: (815) 285-5629

Reviews and Comments


Internal Medicine Doctors in Dixon, IL

Abdulhamid Alkhalaf, M.D.
Infectious Disease
Medicare: Accepting Medicare Assignments
Practice Location: 215 E 1st St Ste 310, Dixon, IL 61021
Phone: 815-285-5979    Fax: 815-285-5845
Eric Gale, M.D.
Infectious Disease
Medicare: Accepting Medicare Assignments
Practice Location: 215 E 1st St, Suite 214, Dixon, IL 61021
Phone: 815-284-1600    
Pranjal M Agrawal, M.D.
Infectious Disease
Medicare: Accepting Medicare Assignments
Practice Location: 102 S Hennepin Ave, Dixon, IL 61021
Phone: 815-284-7733    Fax: 815-288-1487
Dr. Danca Luchici, MD
Infectious Disease
Medicare: Medicare Enrolled
Practice Location: 1321 N Galena Ave, Dixon, IL 61021
Phone: 815-625-4790    
Dr. Fadi M Mustapha, M.D.
Infectious Disease
Medicare: Accepting Medicare Assignments
Practice Location: 215 E 1st St, Dixon, IL 61021
Phone: 815-285-5843    Fax: 815-285-5846
Philippa M Devenney, M.D.
Infectious Disease
Medicare: Not Enrolled in Medicare
Practice Location: 403 E. 1st Street, Katherine Shaw Bethea Hospital, Dixon, IL 61021
Phone: 815-285-5629    Fax: 815-285-5634

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.