Charlotte A. O'Brien, CRNP
Adult Health Nurse Practitioner · Harwood Heights, IL
Charlotte A. O'Brien, CRNP is an adult health nurse practitioner with a practice address in Harwood Heights, Illinois, and NPI 1902123938, issued on Apr 30, 2010. Check the license (Illinois 209012174, as entered in NPPES) with the Illinois board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Charlotte A. O'Brien
- Credential
- CRNP
- Primary taxonomy
- Adult Health Nurse Practitioner 363LA2200X
- License numbers
- 209012174 IL
SP010385 PA
Self-reported in NPPES; status is on the state search - Practice location
- 4747 N Harlem Ave, Harwood Heights, IL 60706
- Phone
- (773) 798-5200
- Enumerated
- Apr 30, 2010
- Record last updated
- May 12, 2026
- Fax
- (708) 741-1014
- Medicare enrollment
- Enrolled (PECOS I20150630000383); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest adult health nurse practitioner records → All 743 in Illinois → Look up another NPI →
Also registered at 4747 N Harlem Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Charlotte A. O'Brien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Illinois board licenses this profession
Search for license 209012174Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
75% fewer Medicare Part D claims than the average adult health nurse practitioner in 2024
325 Medicare Part D claims for 82 beneficiaries, against an average of 1,280 among the 16,937 providers of this specialty who prescribed in Part D. Brand-name drugs were 18% of claims.
Most prescribed
- Amlodipine Besylate41 claims
- Albuterol Sulfate Hfa37 claims
- Atorvastatin Calcium31 claims
- Losartan Potassium12 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
- Oak Street Health Physicians Group PCChicago, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Charlotte A. O'Brien among 743 adult health nurse practitioner records in Illinois
Charlotte A. O'Brien, CRNP is one of 743 adult health nurse practitioner records with a practice address in Illinois. 65% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 36% of them.
- NPI issued2010 · 36% of these records are older, 59% newer
- In a Medicare fileYes · 65% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated2008 · median 2013 among the 372 with a school on file
- Record last updated2026 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LA2200X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
2 adult health nurse practitioner records list a practice address in Harwood Heights
They are 2 of the 55 NPPES records with a practice address in Harwood Heights, and 743 adult health nurse practitioner records in Illinois.
All 743 in Illinois → Every provider in Harwood Heights → Adult Health Nurse Practitioner nationwide →
The 8 adult health nurse practitioner records with the nearest ZIP codes
- Agnes KaspaHarwood Heights, IL 607061841847266
- Lory Arquilla-Maltby, NPElmwood Park, IL 607071205866373
- Linda Sidell, CNPChicago, IL 607071710069513
- Sunina Chacko, NP-CLincolnwood, IL 607121891078655
- Jinu Joss, MSN,AGNP-CNiles, IL 607141225681455
- Catherine MajcherNiles, IL 607141861864175
- Sara Adams, ANPChicago, IL 606601902108913
- Musbah Hashi, NPChicago, IL 606601063150423
Common questions
What is Charlotte A. O'Brien, CRNP's NPI number?
Charlotte A. O'Brien, CRNP's National Provider Identifier (NPI) is 1902123938, issued on Apr 30, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Charlotte A. O'Brien, CRNP located?
The NPPES record lists a practice address at 4747 N Harlem Ave, Harwood Heights, IL, 60706. Phone: (773) 798-5200. Providers update this record themselves, so call before visiting.
How can I verify Charlotte A. O'Brien, CRNP's license?
NPPES lists Illinois license number 209012174, as entered by the provider. Search the Illinois board that licenses this profession; the NPPES record confirms identity only.
How much does Charlotte A. O'Brien, CRNP prescribe under Medicare Part D?
In 2024, Charlotte A. O'Brien, CRNP had 325 Medicare Part D claims for 82 beneficiaries; the average among adult health nurse practitioner prescribers was 1,280. 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.