Quick answers
- Does Margaret M. Mertens accept Medicare assignment?
- Medicare's clinician data says Margaret M. Mertens may accept Medicare assignment (as of October 2, 2026). Ask the office whether they accept it for your visit.
- How many Medicare patients does Margaret M. Mertens see?
- In 2024, CMS data shows 26 Original Medicare patients and 564 services for Margaret M. Mertens. This counts Original Medicare only and measures volume, not quality.
- What is Margaret M. Mertens's NPI number?
- 1225253628. 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 M. Mertens, 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 | 26 |
|---|---|
| Services billed to Medicare | 564 |
| Different services or procedures | 2 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Chiropractic manipulative treatment, 3-4 spinal regions (98941)307 services
- Chiropractic manipulative treatment, 1-2 spinal regions (98940)257 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).
- Arthritis75%
- High blood pressure62%
- High cholesterol58%
Practice locations
Addresses where Margaret M. Mertens is enrolled with Medicare (CMS data updated October 2, 2026).
- 106 S Chestnut AveMarshfield, WI 54449 (715) 384‑9064
Specialties
- Chiropracticprimary
Other chiropractors in Marshfield
Clinicians with the same Medicare primary specialty in Marshfield, WI — not a recommendation.
Clinician information
| Credential | DC |
|---|---|
| Chiropractic college | Palmer College Chiropractic - Davenport |
| Graduation year | 1986 (40 years since chiropractic college) |
| Gender (as listed) | Female |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1225253628 |
| 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