Quick answers
- Does Margaret Chwalinski accept Medicare assignment?
- Yes. Medicare's clinician data says Margaret Chwalinski accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Margaret Chwalinski see?
- In 2024, CMS data shows 533 Original Medicare patients and 2,956 services for Margaret Chwalinski. This counts Original Medicare only and measures volume, not quality.
- What is Margaret Chwalinski's NPI number?
- 1386376671. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Margaret Chwalinski, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 533 |
|---|---|
| Services billed to Medicare | 2,956 |
| Different services or procedures | 38 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Destruction of precancer skin growth, 2-14 growths (17003)1,018 services
- Destruction of precancer skin growth, 1 growth (17000)308 services
- Biopsy of related skin growth, first growth (11102)268 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)266 services
- Biopsy of related skin growth, each additional growth (11103)243 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol75%
- High blood pressure67%
- Arthritis48%
- Ischemic heart disease26%
- Diabetes23%
- Anxiety23%
Practice locations
Addresses where Margaret Chwalinski is enrolled with Medicare (CMS data updated October 2, 2026).
- 1531 S Grove Ave, Unit 101Barrington, IL 60010 (847) 381‑8899
- 353 Bank Dr, Suite 400McHenry, IL 60050 (847) 381‑8899
- 525 E Congress Pkwy, Suite 200Crystal Lake, IL 60014 (847) 381‑8899
- 85 W Algonquin Rd, Suite 220Arlington Heights, IL 60005 (847) 381‑8899
- 8501 W Higgins Rd, Suite 100Chicago, IL 60631 (847) 381‑8899
Group practices
Medicare enrollment lists Margaret Chwalinski as a member of this group (CMS data updated October 2, 2026).
- Derick Dermatology PLLC65 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Barrington
Clinicians with the same Medicare primary specialty in Barrington, IL — not a recommendation.
Other clinicians in Derick Dermatology PLLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| School | Midwestern University, Chicago College Of Osteopathic Med |
|---|---|
| Graduation year | 2023 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1386376671 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians