Mary K. Dahilig, APN, FNP-BC
Nurse Practitioner · Chicago, IL
Mary K. Dahilig, APN, FNP-BC is a nurse practitioner with a practice address in Chicago, Illinois, and NPI 1225314990, issued on Oct 26, 2011. Check the license (Illinois 277003870, as entered in NPPES) with the Illinois board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mary K. Dahilig
- Credential
- APN, FNP-BC
- Primary taxonomy
- Nurse Practitioner 363L00000X
- License numbers
- 277003870 IL
209009165 IL
Self-reported in NPPES; status is on the state search - Practice location
- 20 S Clark St FL 11, Chicago, IL 60603
- Phone
- (312) 926-3627
- Enumerated
- Oct 26, 2011
- Record last updated
- May 6, 2025
- Fax
- (312) 357-2284
- Medicare enrollment
- Enrolled (PECOS I20111227000477); accepts Medicare assignment
- Medical or professional school
- University Of Illinois College Of Med (Chi/Peor/Rock/Chm-Urb), 2011
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest nurse practitioner records → All 4,892 in Illinois → Look up another NPI →
Also registered at 20 S Clark St FL 11
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mary K. Dahilig in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Illinois board licenses this profession
Search for license 277003870Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average nurse practitioner in 2024
38 Medicare Part D claims for 35 beneficiaries, against an average of 1,109 among the 54,319 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Amoxicillin-Clavulanate Potass14 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.
Bills Medicare through one group practice
- Northwestern Medical Faculty FoundationChicago, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mary K. Dahilig among 4,892 nurse practitioner records in Illinois
Mary K. Dahilig, APN, FNP-BC is one of 4,892 nurse practitioner records with a practice address in Illinois. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2011, is newer than 20% of them.
- NPI issued2011 · 20% of these records are older, 78% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2011 · median 2018 among the 3,389 with a school on file
- Record last updated2025 · 36% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363L00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
952 nurse practitioner records list a practice address in Chicago
They are 952 of the 63,379 NPPES records with a practice address in Chicago, and 4,892 nurse practitioner records in Illinois.
All 4,892 in Illinois → Every provider in Chicago → Nurse Practitioner nationwide →
The 8 nurse practitioner records with the nearest ZIP codes
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- Katina NicholasChicago, IL 606031851246110
- Ashley AronsChicago, IL 606021154181139
- Danielle Babbington, DNP, APRN, FNP-BCChicago, IL 606041801165758
- Ivona Barton, NP-CChicago, IL 606041699385088
- Jay DeclaradorChicago, IL 606041417460502
- Michelle Isacson, APRNChicago, IL 606041760432157
Common questions
What is Mary K. Dahilig, APN, FNP-BC's NPI number?
Mary K. Dahilig, APN, FNP-BC's National Provider Identifier (NPI) is 1225314990, issued on Oct 26, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Mary K. Dahilig, APN, FNP-BC located?
The NPPES record lists a practice address at 20 S Clark St FL 11, Chicago, IL, 60603. Phone: (312) 926-3627. Providers update this record themselves, so call before visiting.
How can I verify Mary K. Dahilig, APN, FNP-BC's license?
NPPES lists Illinois license number 277003870, as entered by the provider. Search the Illinois board that licenses this profession; the NPPES record confirms identity only.
How much does Mary K. Dahilig, APN, FNP-BC prescribe under Medicare Part D?
In 2024, Mary K. Dahilig, APN, FNP-BC had 38 Medicare Part D claims for 35 beneficiaries; the average among nurse practitioner prescribers was 1,109. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 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.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.