Aaron Hofmann, MD
As reported to Medicare
- Credential
- MD
- Primary specialty
- Orthopedic Surgery
- Medical school graduation
- 1976
- National Provider Identifier (NPI)
- 1801986401
Total number of knee replacements this clinician billed to Medicare in the most recent 12-month claims period, according to CMS.
Percentile rank of 14 knee replacements compared to other clinicians with a primary specialty of Orthopedic Surgery, Sports Medicine, or Hand Surgery who have billed Medicare for at least one knee replacement in the same period.
The figures above reflect only procedures that this clinician billed to Medicare, according to CMS. Therefore, they may not reflect the total number of procedures this clinician performed during the 12-month reporting period. See Understanding CMS Data below.
Source: Centers for Medicare & Medicaid Services (August 18, 2026 release).
Aaron Hofmann's Knee Replacement Billing Volume Compared to Peers
Reading the curve: find a volume along the bottom, and the line gives the percentile of clinicians with a primary specialty of Orthopedic Surgery, Sports Medicine, or Hand Surgery at or below it. The marked point is this clinician. The shaded block covers the 3,288 clinicians CMS reports as 1-10, because CMS suppresses counts below 11. The axis runs from 0 to 584, the highest count CMS reports in the group, and gives low counts more room than high ones so the whole range fits. The labels under the axis mark the 25th percentile, the median and the 75th percentile; the 25th percentile falls inside the 1-10 range.
Source: Centers for Medicare & Medicaid Services (August 18, 2026 release).
| Percentile | Knee Replacements billed to Medicare |
|---|---|
| 40th | 15 |
| 50th | 22 |
| 60th | 31 |
| 70th | 42 |
| 80th | 60 |
| 90th | 94 |
| Highest | 584 |
Other procedures CMS reports for Aaron Hofmann
CMS publishes a separate count for this clinician in the categories below. Each figure is counted and ranked entirely on its own, so the counts are not added together and the percentile ranks are not comparable with one another.
| Procedure | Procedures billed | Percentile rank |
|---|---|---|
| Hip replacement | 1-10 | 46% or below |
Each percentile rank compares this clinician only with the other clinicians in that procedure's comparison group, so the group changes from row to row. A count shown as a range means CMS suppressed it to protect patient privacy; it does not mean zero.
Previous data releases
CMS refreshes this data "on a quarterly basis, as technically feasible." The table shows this clinician's figures from each CMS data release.
| CMS data release | Knee replacements billed | Percentile rank |
|---|---|---|
| August 18, 2026 Current | 14 | 37% |
| August 11, 2026 Prior | 14 | 37% |
| June 26, 2026 Prior | 14 | 38% |
About these releases. Each release counts procedures over what CMS describes as "a one-year observation window, with a lookback beginning three months prior to the present day", allowing three months for claims to be submitted and processed. CMS does not publish the start and end dates of the window behind any release, and consecutive releases may cover overlapping periods, or the same period with later-arriving claims added.
Understanding CMS Data
CMS's "Knee replacement" category combines specific billing codes for knee replacement surgery to calculate the number of times each clinician billed Medicare for a "Knee replacement." These include first-time knee replacement, partial knee replacement, and revision of a previous knee replacement. CMS reports only procedures that clinicians billed to Original Medicare and Medicare Advantage. Therefore, CMS's procedure volume data does not include procedures that clinicians may have performed on patients who have other health care coverage (e.g., commercial insurance, self-pay, or the VA). Billing variation and coding errors can also affect CMS's data. Therefore, the number of procedures that CMS reports for a clinician may be higher or lower than the actual number of knee replacements a clinician performed during the reporting period. Lastly, only clinicians with a primary specialty of Orthopedic Surgery, Sports Medicine, or Hand Surgery (as reported to Medicare) are presented.
National Percentile Calculation
CMS publishes its own percentile for this data using a single, national pool that also includes clinicians with a primary specialty of Physician Assistant or Nurse Practitioner. We use CMS's percentile formula, but restrict the comparison group to clinicians with a primary specialty of Orthopedic Surgery, Sports Medicine, or Hand Surgery, so our number answers a narrower question: how does this clinician's procedure volume compare with other clinicians who billed Medicare for at least one knee replacement and reported one of those as their primary specialty?