Are the prices that Medicare pay orders of magnitude different? ISTR that Medicare and the VA both pay about $10k per patient per year, which I think is comparable with the NHS. No sources as this is half-remembered.
People on Medicare are over 65 and people in the VA have been in the military. Both of those groups of people are going to have much higher medical needs than the general population.
We would also need to know the average number of visits per patient before this data means anything otherwise it's just data without context or meaning.