Quick answers
- Does Johannes M. Gruenwald accept Medicare assignment?
- Medicare's clinician data says Johannes M. Gruenwald may accept Medicare assignment (as of October 2, 2026). Ask the office whether they accept it for your visit.
- How many Medicare patients does Johannes M. Gruenwald see?
- In 2024, CMS data shows 61 Original Medicare patients and 456 services for Johannes M. Gruenwald. This counts Original Medicare only and measures volume, not quality.
- What is Johannes M. Gruenwald's NPI number?
- 1275623761. 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 Johannes M. Gruenwald, 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 | 61 |
|---|---|
| Services billed to Medicare | 456 |
| Different services or procedures | 24 |
| Participating Medicare provider | Yes |
| Average age of these patients | 71 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)44 services
- Complete ultrasound study of arm and leg arteries (93923)40 services
- Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)25 services
- Testing of autonomic (sympathetic and parasympathetic) nervous system function, at least 5 minutes of tilt (95924)18 services
- Electrocardiogram (ecg) 1 to 3 leads with review by physician (93040)14 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 cholesterol67%
- Arthritis61%
- Diabetes48%
- Ischemic heart disease25%
- Anxiety25%
Practice locations
Addresses where Johannes M. Gruenwald is enrolled with Medicare (CMS data updated October 2, 2026).
- 6221 Colonel Glenn Rd, Suite BLittle Rock, AR 72204 (501) 680‑1271
Group practices
Medicare enrollment lists Johannes M. Gruenwald as a member of this group (CMS data updated October 2, 2026).
- Divine Mercy Health Center5 clinicians in the group
Specialties
- Orthopedic Surgeryprimary
Other orthopedic surgeons in Little Rock
Clinicians with the same Medicare primary specialty in Little Rock, AR — not a recommendation.
Other clinicians in Divine Mercy Health Center
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1977 (49 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1275623761 |
| 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