NPPES file of Aug 9, 2026

Nancy Gryniewicz, M.D.

Family Medicine Physician · Oak Park, IL

Nancy Gryniewicz, M.D. is a family medicine physician with a practice address in Oak Park, Illinois, and NPI 1558368043, issued on Jun 30, 2005. Check the license (Illinois 036089707, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1558368043
Name
Nancy Gryniewicz
Credential
M.D.
Primary taxonomy
Family Medicine Physician 207Q00000X
License number
036089707 IL
Self-reported in NPPES; status is on the state search
Practice location
965 Lake St, Oak Park, IL 60301
Phone
(708) 383-0400
Enumerated
Jun 30, 2005
Record last updated
May 24, 2022
Fax
(708) 383-4314
Medicare enrollment
Enrolled (PECOS I20100830000312); accepts Medicare assignment
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest family medicine physician records → All 6,215 in Illinois → Look up another NPI →

Also registered at 965 Lake St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Hung Duong, MDFamily Medicine Physician1245257781
  2. Nichole Galindez Rodriguez, APN-CNPNurse Practitioner1467290544
  3. Steve Michel, MDInternal Medicine Physician1053340695
  4. Dina Pavilonis, M.D.Family Medicine Physician1316252489
  5. Lily Wawrzon, RD, LDNRegistered Dietitian1073336798
  6. Janis Wiener, MDInternal Medicine Physician1750315586

Verify Nancy Gryniewicz in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
    Search for license 036089707    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Illinois license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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37% more Medicare Part D claims than the average family medicine physician in 2024

4,850 Medicare Part D claims for 377 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims. 58 claims were for opioids.

  1. Nancy Gryniewicz4,850
  2. Specialty average3,544

Most prescribed

  1. Lisinopril298 claims
  2. Atorvastatin Calcium263 claims
  3. Rosuvastatin Calcium262 claims
  4. Amlodipine Besylate253 claims
  5. Levothyroxine Sodium190 claims
  6. Simvastatin177 claims

Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.

Industry payments in 2024: $3,282.17

145 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 55,478 providers of this specialty with any payment received $902.55 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Nancy Gryniewicz$3,282.17
  2. Specialty average$902.55

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Bills Medicare through one group practice

  1. Family Medical Care, LtdOak Park, IL

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Nancy Gryniewicz among 6,215 family medicine physician records in Illinois

Nancy Gryniewicz, M.D. is one of 6,215 family medicine physician records with a practice address in Illinois. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.

  • NPI issued2005 · 0% of these records are older, 91% newer
  • In a Medicare fileYes · 78% of these records are
  • In the CMS Doctors and Clinicians fileYes · 60% of these records are
  • Graduated1994 · median 2006 among the 3,714 with a school on file
  • Record last updated2022 · 54% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

86 family medicine physician records list a practice address in Oak Park

They are 86 of the 2,307 NPPES records with a practice address in Oak Park, and 6,215 family medicine physician records in Illinois.

All 6,215 in Illinois → Every provider in Oak Park → Family Medicine Physician nationwide →

The 8 family medicine physician records with the nearest ZIP codes

  1. Hung Duong, MDOak Park, IL 603011245257781
  2. Peter Grant, M.D.Oak Park, IL 603011306853858
  3. Stephen Humowiecki, MDOak Park, IL 603011477533560
  4. Mary Hutton, MDOak Park, IL 603011164415808
  5. Mary Kelly, D.O.Oak Park, IL 603011912087560
  6. Paul Kungl, MDOak Park, IL 603011831234749
  7. Michael Kyle, MDOak Park, IL 603011578556544
  8. Katherine Lynch, MDOak Park, IL 603011821038720

Common questions

What is Nancy Gryniewicz, M.D.'s NPI number?

Nancy Gryniewicz, M.D.'s National Provider Identifier (NPI) is 1558368043, issued on Jun 30, 2005. An NPI identifies a provider in billing; it is not a license.

Where is Nancy Gryniewicz, M.D. located?

The NPPES record lists a practice address at 965 Lake St, Oak Park, IL, 60301. Phone: (708) 383-0400. Providers update this record themselves, so call before visiting.

How can I verify Nancy Gryniewicz, M.D.'s license?

NPPES lists Illinois license number 036089707, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does Nancy Gryniewicz, M.D. prescribe under Medicare Part D?

In 2024, Nancy Gryniewicz, M.D. had 4,850 Medicare Part D claims for 377 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.