Don’t you have OSDD-1b?
OSDD-1b is not an actual diagnosis in the DSM-V-TR. The site did-research.org created this label via combining the DSM-IV diagnosis of DDNOS-1a/1b/etc. with OSDD. OSDD has no official criteria, and it is up to a professional to judge whether it is a proper diagnosis for each specific case. The DSM-V does not provide numbers for each OSDD diagnosis, but only examples. DDNOS had these numeric labels, and 1b was defined as having alters but no amnesia between them. These were mixed in the creation of did-research.org, but are not official. So while by these labels we do have OSDD-1b, we officially have “OSDD due to lack of amnesia between alters”. More information is available here