Karen O' Connor, M.D.
NPI 1538512280 · Family Medicine Physician · Chicago, IL
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karen O' Connor, M.D. is a Family Medicine Physician provider in Chicago, IL (NPI 1538512280).
Provider details
- NPI number
- 1538512280
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 036.148803 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
9 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 · 41 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 112 | 41 |
| Metformin Hcl | 108 | 36 |
| Lisinopril | 69 | 20 |
| Amlodipine Besylate | 55 | 22 |
| Levothyroxine Sodium | 54 | 17 |
| Dulaglutidebrand: Trulicity | 47 | 12 |
| Omeprazole |
Practice location
Mailing address
Registry dates
- Enumerated
- 2016-07-18
- Last updated
- 2020-06-03
- Certified
- 2020-06-03
Frequently asked questions
- What is Karen O' Connor's NPI number?
- Karen O' Connor's National Provider Identifier (NPI) is 1538512280, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen O' Connor's specialty?
- Karen O' Connor is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Karen O' Connor located?
- Karen O' Connor's practice location on file with NPPES is 1431 N Western Ave Ste 406, Chicago, IL 60622-1774.
- What is Karen O' Connor's phone number?
- The practice phone number listed in the NPPES registry for Karen O' Connor is (312) 633-5841.
- Does Karen O' Connor accept Medicare?
- Karen O' Connor is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karen O' Connor's NPI active?
- Yes — Karen O' Connor's NPI (1538512280) is active in the NPPES registry as of the last update on 2020-06-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.