2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Mental Disorders 290-319 > Neurotic Disorders, Personality Disorders, And Other Nonpsychotic Mental Disorders 300-316 > Anxiety, Dissociative And Somatoform Disorders 300.* > 2008 ICD-9-CM Diagnosis 300.0 Anxiety states  On October 1, 2008 the 2009 ICD-9-CM codes came into effect. Therefore, this code may be out of date. The 2009 version of ICD-9-CM 300.0 can be accessed here. 300.0 is a non-specific code that cannot be used to specify a diagnosis View the ICD-9-CM Volume 1 300.* hierarchy ICD9Data's sister site ProcedureCodes.com launches with the 2008/09 CPT® codes - read more on the ICD9Data.com blog. 300.0 excludes: anxiety in: acute stress reaction (308.0) transient adjustment reaction (309.24) neurasthenia (300.5) psychophysiological disorders (306.0-306.9) separation anxiety (309.21)