UPDATE 2-Health Net results top forecasts, shares rise

* Third-quarter adjusted profit beats forecasts by 6 cents

* Revenue rises 3.9 percent to $4 billion

* Plan enrollment falls 3.8 percent from a year ago

* Trims high end of full-year earnings estimate range

* Shares rise 4.07 percent to $15.85 on NYSE (Adds earnings details, analyst comments, share activity)

CHICAGO, Nov 3 (Reuters) - Regional health insurer Health Net Inc (HNT.N: Quote, Profile, Research) reported adjusted quarterly earnings on Tuesday that beat expectations, helped by strong sales in the western United States and lower administrative costs.

The Los Angeles-based company reported a third-quarter net loss of $66 million, or 64 cents a share, compared with net income of $18.5 million, or 17 cents a share, a year earlier, largely due to charges related to the pending sale of its Northeast division to UnitedHealth Group Inc (UNH.N: Quote, Profile, Research).

Excluding special items, Health Net reported earnings of $69.6 million, or 67 cents a share.

Analysts on average had expected earnings excluding items of 61 cents a share, according to Thomson Reuters I/B/E/S.