Guerin Williams, PA
NPI 1750564787 · Physician Assistant · Chicago, IL
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Guerin Williams, PA is a Physician Assistant provider in Chicago, IL (NPI 1750564787).
Provider details
- NPI number
- 1750564787
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA
- Sex
- Male
- Sole proprietor
- No
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 tenure28% of score
18 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
460 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Ultrasound Measurement of Bladder Capacity After Voiding51798 | 238 | $12 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More99212 | 76 | $49 |
| Diagnostic Exam of Bladder and Urethra Using an Endoscope52000 | 59 | $209 |
| New Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 15 Minutes Or More99202 | 34 | $64 |
| Complex Measurement of Pressure of Urine Flow in Bladder With Voiding Pressure Studies51728 | 14 | $315 |
| Non-Needle Measurement and Recording of Electrical Activity of Muscles at Bladder and Bowel Openings |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 12 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Tamsulosin Hcl | 130 | 45 |
| Cephalexin | 43 | 28 |
| Vibegronbrand: Gemtesa | 43 | — |
| Mirabegronbrand: Myrbetriq | 38 | 12 |
| Testosterone | 34 | — |
| Trospium Chloride | 29 | 15 |
| Alfuzosin Hclbrand: Alfuzosin Hcl Er | 28 | 12 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-12-13
- Last updated
- 2008-01-18
Frequently asked questions
- What is Guerin Williams's NPI number?
- Guerin Williams's National Provider Identifier (NPI) is 1750564787, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Guerin Williams's specialty?
- Guerin Williams is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Guerin Williams located?
- Guerin Williams's practice location on file with NPPES is 680 N Lake Shore Dr, Chicago, IL 60611-4546.
- What is Guerin Williams's phone number?
- The practice phone number listed in the NPPES registry for Guerin Williams is (312) 695-9797.
- Does Guerin Williams accept Medicare?
- Guerin Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Guerin Williams's NPI active?
- Yes — Guerin Williams's NPI (1750564787) is active in the NPPES registry as of the last update on 2008-01-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.