Quick answers
- Does Mark W. Niemer accept Medicare assignment?
- Yes. Medicare's clinician data says Mark W. Niemer 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 Mark W. Niemer see?
- In 2024, CMS data shows 26 Original Medicare patients and 336 services for Mark W. Niemer. This counts Original Medicare only and measures volume, not quality.
- What is Mark W. Niemer's NPI number?
- 1275585259. 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 Mark W. Niemer, 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 | 336 |
| Different services or procedures | 38 |
| Participating Medicare provider | Yes |
| Average age of these patients | 71 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)32 services
- Insertion of needle into vein for collection of blood sample (36415)27 services
- Measurement c-reactive protein for detection of infection or inflammation (86140)21 services
- Blood creatinine level (82565)15 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%
- Arthritis75%
- High blood pressure65%
Practice locations
Addresses where Mark W. Niemer is enrolled with Medicare (CMS data updated October 2, 2026).
- 1500 Associates DrDubuque, IA 52002 (563) 584‑4100
Group practices
Medicare enrollment lists Mark W. Niemer as a member of this group (CMS data updated October 2, 2026).
- Medical Associates Clinic P C233 clinicians in the group
Specialties
- Rheumatologyprimary
Other rheumatologists in Iowa
Clinicians with the same Medicare primary specialty in Iowa — not a recommendation.
Other clinicians in Medical Associates Clinic P C
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Ohio State University College Of Medicine |
| Graduation year | 1985 (41 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1275585259 |
| 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