Quick answers
- Does Joanna M. Niemiec accept Medicare assignment?
- Yes. Medicare's clinician data says Joanna M. Niemiec 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 Joanna M. Niemiec see?
- In 2024, CMS data shows 767 Original Medicare patients and 5,421 services for Joanna M. Niemiec. This counts Original Medicare only and measures volume, not quality.
- What is Joanna M. Niemiec's NPI number?
- 1821016791. 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 Joanna M. Niemiec, 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 | 767 |
|---|---|
| Services billed to Medicare | 5,421 |
| Different services or procedures | 27 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Injection, darbepoetin alfa, 1 microgram (non-esrd use) (J0881)1,321 services
- Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month (99490)832 services
- Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)749 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)696 services
- Chronic care management services for two or more chronic conditions, additional 20 minutes of clinical staff time directed by health care professional, per calendar month (99439)466 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%
- Chronic kidney disease75%
- Diabetes54%
- Arthritis53%
- Ischemic heart disease43%
Hospitals where Joanna M. Niemiec works
Medicare's Facility Affiliation Data lists Joanna M. Niemiec 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.
- Beloit Health SystemBeloit, WI · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 520100
- Javon Bea HospitalRockford, IL · Acute Care Hospital · closed, according to its website · CCN 140239
- Rochelle Community HospitalRochelle, IL · Critical Access Hospital · Emergency services: listed by Medicare · CCN 141312
- Saint Anthony Medical CenterRockford, IL · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 140233
- UW HealthRockford, IL · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 140228
Practice locations
Addresses where Joanna M. Niemiec is enrolled with Medicare (CMS data updated October 2, 2026).
- 1969 W Hart RdBeloit, WI 53511 (815) 227‑8300
- 612 Roxbury RdRockford, IL 61107 (815) 227‑8300
Group practices
Medicare enrollment lists Joanna M. Niemiec as a member of this group (CMS data updated October 2, 2026).
- Rna of Rockford, PLLC18 clinicians in the group
Specialties
- Nephrologyprimary
Other nephrologists in Beloit
Clinicians with the same Medicare primary specialty in Beloit, WI — not a recommendation.
Other clinicians in Rna of Rockford, PLLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1997 (29 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1821016791 |
| 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