There are 11 distinct anxiety disorders in the DSM-5-TR as well as one panic attack specifier. In the DSM-5, first published in 2013, obsessive-compulsive disorder (OCD) and post-traumatic stress disorder (PTSD) were moved to separate sections.
The DSM-5 also includes gambling disorder under this classification. The American Psychiatric Association explains that this change "reflects the increasing and consistent evidence that some behaviors, such as gambling, activate the brain reward system with effects similar to those of drugs of abuse and that gambling disorder symptoms resemble substance use disorders to a certain extent."