Katie O'Sullivan
NPI 1902038094 · Endocrinology, Diabetes & Metabolism Physician · Chicago, IL
Enrolled with Medicare as Practitioner - Endocrinology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Katie O'Sullivan is a Endocrinology, Diabetes & Metabolism Physician provider in Chicago, IL (NPI 1902038094).
Provider details
- NPI number
- 1902038094
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Sex
- Female
- Sole proprietor
- No
- License
- 036132084 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
16 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
508 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. 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 .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 125 | $137 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 86 | $106 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 80 | $17 |
| Blood Glucose (sugar) Test Performed By Hand-Held Instrument82962 | 67 | $3 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 62 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 34 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 190 | 58 |
| Semaglutidebrand: Ozempic | 133 | 46 |
| Tirzepatidebrand: Mounjaro | 115 | 31 |
| Metformin Hclbrand: Metformin Hcl Er | 110 | 34 |
| Dulaglutidebrand: Trulicity | 71 | 17 |
| Empagliflozinbrand: Jardiance |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$14 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2009-08-22
- Last updated
- 2022-10-24
Frequently asked questions
- What is Katie O'Sullivan's NPI number?
- Katie O'Sullivan's National Provider Identifier (NPI) is 1902038094, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Katie O'Sullivan's specialty?
- Katie O'Sullivan is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is Katie O'Sullivan located?
- Katie O'Sullivan's practice location on file with NPPES is 5841 S Maryland Ave, Chicago, IL 60637-1443.
- What is Katie O'Sullivan's phone number?
- The practice phone number listed in the NPPES registry for Katie O'Sullivan is (888) 824-0200.
- Does Katie O'Sullivan accept Medicare?
- Katie O'Sullivan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Katie O'Sullivan's NPI active?
- Yes — Katie O'Sullivan's NPI (1902038094) is active in the NPPES registry as of the last update on 2022-10-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.