PHILADELPHIA — A fee dispute between actor Bill Cosby and one of the many law firms hired to address his legal problems shows the Los Angeles firm alone was billing Cosby $1 million a month in the run-up to his first sex assault trial.

The imprisoned Cosby is challenging a California arbitration award that upholds nearly $7 million of the $9.2 million billed by Quinn Emanuel Urquhart & Sullivan for nine months work.

Cosby, 81, accused the firm in a petition Friday of elder abuse and “egregious” billing practices, and of fraud for representing both him and the insurance company he was fighting in court, American International Group Inc., over his coverage.

The Quinn Emanuel team was led by partner Christopher Tayback, the son of the late actor Vic Tayback. Quinn Emanuel had been retained to represent Cosby in three lawsuits in late 2015, but eventually had 28 lawyers working on 10 cases involving 14 accusers across the country as Cosby’s legal woes snowballed. The lawyers made about $500 to $1,075 per hour.

Cosby paid the firm $2 million while AIG kicked in $2.3 million, the documents show.