A powerful group of MPs has criticised cross-government accounts as out-of-date and incomplete.

The Public Accounts Committee (PAC) praised the idea behind the Whole of Government Accounts (WGA) – which sets out the combined financial position of around 1500 public sector bodies.

But it warned the document was more of an elaborate accounting exercise than a meaningful tool.

The Treasury published the second edition of the WGA in October, 19 months after the financial year it covers ended.

Margaret Hodge, PAC chairwoman, said: "The WGA should be used to identify the nation's key financial risks, such as the spiralling cost of clinical negligence – £17.5 billion in the accounts – and set out how they are being managed. It should also be used to help Government make better spending choices by highlighting the financial consequences of past decisions, such as the £144.6bn currently owed under PFI schemes and the estimated £60.9bn cost of nuclear decommissioning.

"And it should allow us to track the Government's performance in key areas such as tackling fraud and error, which costs the taxpayer some £21.2bn a year."

However, a spokesman for the Treasury said: "The WGA were published for the first time in 2011, despite legislation enabling their publication being passed in 2000.

"When compared to what was in place before, they are a giant leap forward in terms of fiscal transparency.

"They set out many future liabilities like PFI costs and pension costs for the first time and leading accountancy body the ICAEW have said they put the UK ahead of the pack in terms of financial management."

A Coalition source said the cross-party PAC should be "impartial, not a political plaything".