NATIONAL security leaker Chelsea Manning is not receiving medical treatment for her gender identity condition, it has been claimed.

The American Civil Liberties Union and Manning's civilian lawyer David Coombs have told the US Disciplinary Barracks in Fort Leavenworth, Kansas, and officials including defence secretary Chuck Hagel, that a lawsuit will be filed if it is not confirmed by September 4 that the treatment will be provided for the army private.

Manning, who changed her name from Bradley after her conviction, is serving a 35-year sentence at Fort Leavenworth for sending classified documents to the WikiLeaks website.

She has been diagnosed with gender dysphoria, the sense of being a woman in a man's body.

Manning sought evaluation and treatment after she was sent to Fort Leavenworth last September and wants hormone therapy.