Quick answers
- Does John M. Mahowald accept Medicare assignment?
- Yes. Medicare's clinician data says John M. Mahowald 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 John M. Mahowald see?
- In 2024, CMS data shows 281 Original Medicare patients and 497 services for John M. Mahowald. This counts Original Medicare only and measures volume, not quality.
- What is John M. Mahowald's NPI number?
- 1952303570. 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 John M. Mahowald, 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 | 281 |
|---|---|
| Services billed to Medicare | 497 |
| Different services or procedures | 22 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)274 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)45 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)20 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)18 services
- Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)16 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%
- Ischemic heart disease57%
- Atrial fibrillation48%
- Arthritis46%
- Heart failure35%
Hospitals where John M. Mahowald works
Medicare's Facility Affiliation Data lists John M. Mahowald 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.
- Alomere HealthAlexandria, MN · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 240030
- Astera HealthWadena, MN · Critical Access Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 241354
- CentraCare - BensonBenson, MN · Critical Access Hospital · Emergency services: listed by Medicare · CCN 241365
- CentraCare - St. Cloud HospitalSaint Cloud, MN · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 240036
- Chippewa County HospitalMontevideo, MN · Critical Access Hospital · Emergency services: listed by Medicare · CCN 241325
Practice locations
Addresses where John M. Mahowald is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 15; the Medicare profile lists all.
- 101 Willmar Ave SWWillmar, MN 56201 (320) 231‑5000
- 101 Willmar Ave SW, Affiliated Community Medical CenterWillmar, MN 56201 (320) 231‑5000
- 111 17th E Ave, Centracare Dialysis AlexandriaAlexandria, MN 56308 (800) 835‑6652
- 1200 6th Ave NSaint Cloud, MN 56303
- 1200 6th Ave NSt Cloud, MN 56303 (320) 252‑5131
Group practices
Medicare enrollment lists John M. Mahowald as a member of these groups (CMS data updated October 2, 2026).
- CentraCare Clinic791 clinicians in the group
- Astera Health107 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in Minnesota →
Other cardiologists in Willmar
Clinicians with the same Medicare primary specialty in Willmar, MN — not a recommendation.
Other clinicians in CentraCare Clinic
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Minnesota Medical School |
| Graduation year | 1977 (49 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1952303570 |
| 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