Charlotte O'Brien, CRNP
NPI 1902123938 · Adult Health Nurse Practitioner · Harwood Heights, IL
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Charlotte O'Brien, CRNP is a Adult Health Nurse Practitioner provider in Harwood Heights, IL (NPI 1902123938).
Provider details
- NPI number
- 1902123938
- Entity type
- Individual
- Primary specialty
- Adult Health Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- CRNP
- Sex
- Female
- Sole proprietor
- No
- License
- SP010385 (PA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
16 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 4 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 41 | 13 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 37 | 11 |
| Atorvastatin Calcium | 31 | 19 |
| Losartan Potassium | 12 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (1)
- 4848 W Irving Park RdChicago, IL 60641-2718Phone: (773) 724-6200Fax: (773) 866-8015
Registry dates
- Enumerated
- 2010-04-30
- Last updated
- 2026-05-12
- Certified
- 2026-05-12
Frequently asked questions
- What is Charlotte O'Brien's NPI number?
- Charlotte O'Brien's National Provider Identifier (NPI) is 1902123938, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Charlotte O'Brien's specialty?
- Charlotte O'Brien is listed in the NPPES registry with a primary specialty of Adult Health Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Charlotte O'Brien located?
- Charlotte O'Brien's practice location on file with NPPES is 4747 N Harlem Ave, Harwood Heights, IL 60706-4600.
- What is Charlotte O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Charlotte O'Brien is (773) 798-5200.
- Does Charlotte O'Brien accept Medicare?
- Charlotte O'Brien is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Charlotte O'Brien's NPI active?
- Yes — Charlotte O'Brien's NPI (1902123938) is active in the NPPES registry as of the last update on 2026-05-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.