Nadiia Marenych, MD
NPI 1235668831 · Endocrinology, Diabetes & Metabolism Physician · Lake Geneva, WI
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nadiia Marenych, MD is a Endocrinology, Diabetes & Metabolism Physician provider in Lake Geneva, WI (NPI 1235668831).
Provider details
- NPI number
- 1235668831
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 036.151695 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
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
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
679 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 | 391 | $125 |
| Continuous Monitoring of Blood Sugar Level in Tissue Fluid Using Sensor Under Skin With Interpretation and Report95251 | 156 | $33 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 86 | $163 |
| 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 | 35 | $16 |
| Continuous Monitoring of Blood Sugar Level in Tissue Fluid Using Sensor Under Skin With Provider Supplied Equipment95250 | 11 | $146 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 52 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 380 | 75 |
| Semaglutidebrand: Ozempic | 327 | 54 |
| Empagliflozinbrand: Jardiance | 307 | 57 |
| Insulin Glargine,hum.rec.anlogbrand: Lantus Solostar | 168 | 43 |
| Metformin Hclbrand: Metformin Hcl Er | 129 | 36 |
| Dulaglutidebrand: Trulicity | 107 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$140 across 8 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
- 2017-06-07
- Last updated
- 2025-12-29
- Certified
- 2025-12-29
Frequently asked questions
- What is Nadiia Marenych's NPI number?
- Nadiia Marenych's National Provider Identifier (NPI) is 1235668831, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nadiia Marenych's specialty?
- Nadiia Marenych is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is Nadiia Marenych located?
- Nadiia Marenych's practice location on file with NPPES is 146 E Geneva Sq, Lake Geneva, WI 53147-9694.
- What is Nadiia Marenych's phone number?
- The practice phone number listed in the NPPES registry for Nadiia Marenych is (262) 249-5000.
- Does Nadiia Marenych accept Medicare?
- Nadiia Marenych is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nadiia Marenych's NPI active?
- Yes — Nadiia Marenych's NPI (1235668831) is active in the NPPES registry as of the last update on 2025-12-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.