Quick answers
- Does Cassandra R. Hartwig accept Medicare assignment?
- Yes. Medicare's clinician data says Cassandra R. Hartwig 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 Cassandra R. Hartwig see?
- In 2024, CMS data shows 149 Original Medicare patients and 874 services for Cassandra R. Hartwig. This counts Original Medicare only and measures volume, not quality.
- What is Cassandra R. Hartwig's NPI number?
- 1215476163. 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 Cassandra R. Hartwig, 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 | 149 |
|---|---|
| Services billed to Medicare | 874 |
| Different services or procedures | 30 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)201 services
- Removal of skin and tissue, 20.0 sq cm or less (11042)187 services
- New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)87 services
- Removal of tissue from wound, 20.0 sq cm or less (97597)62 services
- Removal of skin and tissue, each additional 20.0 sq cm or less (11045)51 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 blood pressure75%
- High cholesterol75%
- Diabetes52%
- Heart failure48%
- Chronic kidney disease46%
- Ischemic heart disease41%
Hospitals where Cassandra R. Hartwig works
Medicare's Facility Affiliation Data lists Cassandra R. Hartwig at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Aspirus Eagle River HospitalEagle River, WI · Critical Access Hospital · Emergency services: listed by Medicare · CCN 521300
- Aspirus Rhinelander HospitalRhinelander, WI · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 520019
- Aspirus Tomahawk HospitalTomahawk, WI · Critical Access Hospital · Emergency services: listed by Medicare · CCN 521313
- Howard Young Medical CenterWoodruff, WI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 520091
- Marshfield Medical Center - MinocquaMinocqua, WI · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 520212
Practice locations
Addresses where Cassandra R. Hartwig is enrolled with Medicare (CMS data updated October 2, 2026).
- 401 W Mohawk DrTomahawk, WI 54487 (715) 453‑7200
Group practices
Medicare enrollment lists Cassandra R. Hartwig as a member of this group (CMS data updated October 2, 2026).
- Aspirus Rhinelander and Tomahawk Hospitals and Clinics, Inc.574 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Tomahawk
Clinicians with the same Medicare primary specialty in Tomahawk, WI — not a recommendation.
Other clinicians in Aspirus Rhinelander and Tomahawk Hospitals and Clinics, Inc.
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2016 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1215476163 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- 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