Cryptogenic is a term that refers to something of obscure or unknown origin. It is commonly used to refer to: ...
of unknown origin
Of obscure, indeterminate aetiology or origin, in contrast to phanerogenic. ... Origin: crypto-+ G. Genesis, origin ... (05 Mar 2000) ... 
(krip″to-jen´ik) of obscure or doubtful origin.
Type: Term Pronunciation: krip′tō-jen′ik Definitions: 1. Of obscure, indeterminate etiology or origin, in contrast to phanerogenic.
Cryptogenic is said of diseases of an unknown or obscure origin.
cryptogenic, cryptogene Of unknown, indeterminate, or obscure cause or origin.
of obscure or unknown origin, as a disease.