Your Query returns 12 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Scn9aNM_01885210090603415
Scn9aNW_04765510116
SCN9AAJ2773939606603415
SCN9AAJ3108829606603415
SCN9AAJ3108839606603415
SCN9AAJ3108979606603415
SCN9AAJ5809189606603415
SCN9AAJ5809199606603415
SCN9ANM_0029779606PN1    NE-NA    603415
Scn9aNT_03920710090603415
SCN9ANT_0054039606603415
Scn9aNM_13328910116PN1   

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* OMIM link based on symbol match for human and mouse.

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Text2Knowledge ... Yong Huang 2002