The West Ham winger has proved a quality addition to Lee Clark's ranks since joining in November, making a total of 12 appearances to date.
Hall will now remain at St Andrew's until at least March 16, a hectic period which takes in as many as seven npower Championship fixtures against Watford, Sheffield Wednesday, Peterborough, Hull, Blackpool, Derby and Middlesbrough.
The loan arrangement will again be reviewed in March by all parties.
