The NHS in-house interim management consultancy has saved trusts and commissioners £9.1m over the past financial year, it has said.
NHS Interim Management and Support calculated the savings during 2012-13 by comparing how much the same work would have cost if it had been carried out by a commercial consultancy firm.
The organisation, now hosted by NHS Improving Quality, part of NHS England, has also worked for the Department of Health and NHS England.
The £9.1m figure is a significant increase on the previous year, when the agency estimated the savings it had allowed to be £7.1m.
Richard Jeavons, IMAS senior partner, last year predicted an increase in workload in the run-up to the abolition of primary care trusts and strategic health authorities at the end of March this year.
IMAS recently completed its 250th assignment, supporting a clinical commissioning group cluster in the Midlands to improve 18-week elective wait performance in its area, and is currently managing 140 assignments across England.
IMAS also hosts the intensive support teams in emergency, elective and cancer care.
HSJ reported in April that teams supporting organisations with emergency care pathway problems were at their busiest ever, with 64 assignments in that month, compared to an average of 57 in previous months.
The body was set up in 2008 to encourage the NHS to use the skills already in the service, rather than contracting for outside support, and it now has 750 managers and clinicians on its books.