Nancy Gryniewicz, M.D.
NPI 1558368043 · Family Medicine Physician · Oak Park, IL
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nancy Gryniewicz, M.D. is a Family Medicine Physician provider in Oak Park, IL (NPI 1558368043).
Provider details
- NPI number
- 1558368043
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- Yes
- License
- 036089707 (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
20 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
3,946 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) |
|---|---|---|
| Management Using the Results of Remote Vital Sign Monitoring Per Calendar Month, Each Additional 20 Minutes99458 | 722 | $40 |
| Chronic Care Management Services, First 20 Minutes of Clinical Staff Time Directed By Health Care Professional, Per Calendar Month99490 | 641 | $65 |
| Management Using the Results of Remote Vital Sign Monitoring Per Calendar Month, First 20 Minutes99457 | 520 | $50 |
| Remote Monitoring of Physiologic Parameters, Initial Supply of Devices With Daily Recordings Or Programmed Alerts Transmission, Each 30 Days99454 | 475 | $48 |
| Collection and Interpretation of Physical Parameters Stored in Computers And/Or Transmitted By the Patient And/Or Caregiver to Qualified Health Care Professional, Requiring 30 Minutes Or More, Per 30 Days99091 | 443 | $56 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 83 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Lisinopril | 298 | 90 |
| Atorvastatin Calcium | 263 | 82 |
| Rosuvastatin Calcium | 262 | 94 |
| Amlodipine Besylate | 253 | 82 |
| Levothyroxine Sodium | 190 | 54 |
| Simvastatin | 177 | 50 |
| Losartan Potassium |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$3,282 across 145 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
- 2005-06-30
- Last updated
- 2022-05-24
- Certified
- 2022-05-24
Frequently asked questions
- What is Nancy Gryniewicz's NPI number?
- Nancy Gryniewicz's National Provider Identifier (NPI) is 1558368043, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nancy Gryniewicz's specialty?
- Nancy Gryniewicz is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Nancy Gryniewicz located?
- Nancy Gryniewicz's practice location on file with NPPES is 965 Lake St, Oak Park, IL 60301-1292.
- What is Nancy Gryniewicz's phone number?
- The practice phone number listed in the NPPES registry for Nancy Gryniewicz is (708) 383-0400.
- Does Nancy Gryniewicz accept Medicare?
- Nancy Gryniewicz is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nancy Gryniewicz's NPI active?
- Yes — Nancy Gryniewicz's NPI (1558368043) is active in the NPPES registry as of the last update on 2022-05-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.