Lillie Cook
NPI 1205583085 · Physician Assistant · Chicago, IL
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Lillie Cook is a Physician Assistant provider in Chicago, IL (NPI 1205583085).
Provider details
- NPI number
- 1205583085
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Sex
- Female
- Sole proprietor
- Yes
- License
- 085009578 (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 tenure33% of score
4 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
2 documented practice locations
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 |
|---|---|---|
| Metoclopramide Hcl | 48 | 29 |
| Omeprazole | 26 | 16 |
| Pantoprazole Sodium | 21 | 14 |
| Lansoprazole | 11 | — |
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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$243 across 11 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
Additional practice locations (1)
- 800 Austin StEvanston, IL 60202-3439Phone: (847) 491-9020Fax: (847) 491-0182
Registry dates
- Enumerated
- 2022-03-02
- Last updated
- 2025-11-20
- Certified
- 2025-11-20
Frequently asked questions
- What is Lillie Cook's NPI number?
- Lillie Cook's National Provider Identifier (NPI) is 1205583085, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Lillie Cook's specialty?
- Lillie Cook is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Lillie Cook located?
- Lillie Cook's practice location on file with NPPES is 331 W Surf St Ste 912, Chicago, IL 60657-7227.
- What is Lillie Cook's phone number?
- The practice phone number listed in the NPPES registry for Lillie Cook is (847) 491-9020.
- Does Lillie Cook accept Medicare?
- Lillie Cook is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Lillie Cook's NPI active?
- Yes — Lillie Cook's NPI (1205583085) is active in the NPPES registry as of the last update on 2025-11-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.