A claim of unfair dismissal by Commonwealth Bank whistleblower Dr Benjamin Koh is likely to be quietly settled in the next few days.

The former chief medical officer of CBA's insurance arm, CommInsure, alleges he was sacked by the bank in August 2015 for being a whistleblower.

Dr Koh went public in a joint Fairfax Media and Four Corners CommInsure investigation, which revealed doctors in the bank being pressured to change their assessments of customers to avoid payouts; delaying payouts to terminally ill customers; and a refusal to honour claims to former staff who were medically retired.

Dr Koh filed an unfair dismissal claim in May 2016 that included explosive allegations of manipulation of medical reports, missing files and "artificial" declining of claims that should have been accepted.