A Fairfax County lawyer has been suspended from practicing law in Virginia for 10 years for failing to obtain title insurance coverage for three Northern Virginia home purchasers Virginia State Bar officials said yesterday.

The disciplinary action was taken against Robert C. Black, 44, who formerly maintained a law practice in Dunn Loring. Black was suspended from practicing law for five years by a three-judge Fairfax Circuit Court panel last April and was ordered suspended for an additional five years by a Virginia State Bar disciplinary panel early this month.

Black could not be reached for comment yesterday. Bar counsel Michael L. Rigsby said Black had not appeared at an April 11 Fairfax Court hearing and had also failed to attend a May 24 hearing by the bar's disciplinary panel. The bar's suspension order was announced yesterday.

Complaints against Black were lodged with the bar by two Virginia lending institutions, Arlington-Fairfax and Dominion Federal savings and loan associations. According to bar records, both institutions said Black had failed to obtain title insurance as required in representing home buyers in 1976 and 1977.

The savings associations had provided mortgages to Black's clients. Title insurance was required by the mortgage lenders as protection against possible claims that the home buyers lacked proper title to their property.

Bar counsel Rigsby said that Black had been found guilty of violating a provision of the bar's disciplinary rules that prohibits lawyers from neglecting any part of a client's case.