July 9 (Reuters) - Investigators from the U.S.

Department of Justice are questioning former employees of

UnitedHealth Group ( UNH ) over how the company deployed doctors

and nurses to gather diagnoses that bolstered its Medicare

payments, the Wall Street Journal reported on Wednesday, citing

people familiar with the matter.

Shares of the healthcare conglomerate fell about 1% in

premarket trading.

(Reporting by Bhanvi Satija in Bengaluru; Editing by Shinjini

Ganguli)