Winnie Nhan, DO
NPI 1245681709 · Endocrinology, Diabetes & Metabolism Physician · Glen Ellyn, IL
Enrolled with Medicare as Practitioner - Endocrinology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Winnie Nhan, DO is a Endocrinology, Diabetes & Metabolism Physician provider in Glen Ellyn, IL (NPI 1245681709).
Provider details
- NPI number
- 1245681709
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Female
- Sole proprietor
- No
- License
- 036.157571 (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
9 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
2,911 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 | 571 | $132 |
| 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 | 413 | $17 |
| Hemoglobin A1c Level83036 | 376 | $10 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 275 | $9 |
| Blood Test, Thyroid Stimulating Hormone (tsh)84443 | 180 | $16 |
| Continuous Monitoring of Blood Sugar Level in Tissue Fluid Using Sensor Under Skin With Interpretation and Report95251 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 50 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Metformin Hcl | 403 | 135 |
| Glimepiride | 346 | 101 |
| Levothyroxine Sodium | 316 | 106 |
| Semaglutidebrand: Ozempic | 262 | 69 |
| Empagliflozinbrand: Jardiance | 260 | 80 |
| Insulin Glargine,hum.rec.anlogbrand: Lantus Solostar | 248 | 85 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$524 across 32 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)
- 4000 Ave Maria DrLobby C Suite 1300Ann Arbor, MI 48105Phone: (734) 930-4450
Registry dates
- Enumerated
- 2016-06-27
- Last updated
- 2023-08-16
- Certified
- 2023-08-16
Frequently asked questions
- What is Winnie Nhan's NPI number?
- Winnie Nhan's National Provider Identifier (NPI) is 1245681709, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Winnie Nhan's specialty?
- Winnie Nhan is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is Winnie Nhan located?
- Winnie Nhan's practice location on file with NPPES is 430 Pennsylvania Ave Ste 310, Glen Ellyn, IL 60137-4464.
- What is Winnie Nhan's phone number?
- The practice phone number listed in the NPPES registry for Winnie Nhan is (630) 789-4910.
- Does Winnie Nhan accept Medicare?
- Winnie Nhan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Winnie Nhan's NPI active?
- Yes — Winnie Nhan's NPI (1245681709) is active in the NPPES registry as of the last update on 2023-08-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.