Gwen Cassidy, APN
NPI 1588063994 · Acute Care Nurse Practitioner · Chicago, IL
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gwen Cassidy, APN is a Acute Care Nurse Practitioner provider in Chicago, IL (NPI 1588063994).
Provider details
- NPI number
- 1588063994
- Entity type
- Individual
- Primary specialty
- Acute Care Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- APN
- Sex
- Female
- Sole proprietor
- No
- License
- 209011722 (IL)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
11 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
41 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 | 41 | $87 |
Typical Medicare-allowed amounts for these services range $87–$87 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Omeprazole | 124 | 48 |
| Rabeprazole Sodium | 36 | 14 |
| Dexlansoprazolebrand: Dexlansoprazole Dr | 28 | — |
| Pantoprazole Sodium | 27 | 11 |
| Esomeprazole Magnesium | 23 | 13 |
| Lansoprazole | 20 | — |
| Famotidine | 18 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$369 across 7 records (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
- 2014-08-21
- Last updated
- 2014-08-21
Frequently asked questions
- What is Gwen Cassidy's NPI number?
- Gwen Cassidy's National Provider Identifier (NPI) is 1588063994, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gwen Cassidy's specialty?
- Gwen Cassidy is listed in the NPPES registry with a primary specialty of Acute Care Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Gwen Cassidy located?
- Gwen Cassidy's practice location on file with NPPES is 675 N Saint Clair St, Chicago, IL 60611-5975.
- What is Gwen Cassidy's phone number?
- The practice phone number listed in the NPPES registry for Gwen Cassidy is (312) 695-5620.
- Does Gwen Cassidy accept Medicare?
- Gwen Cassidy is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gwen Cassidy's NPI active?
- Yes — Gwen Cassidy's NPI (1588063994) is active in the NPPES registry as of the last update on 2014-08-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.