I found a link that explains the numbers from the DSM:
http://www.mental-health-today.com/bp/bi1.htm
Quote:
The diagnostic codes for Bipolar I Disorder are selected as follows:
1. The first three digits are 296.
2. The fourth digit is 0 if there is a single Manic Episode.
For recurrent episodes, the fourth digit is 4 if the current or most recent episode is a Hypomanic Episode or a Manic Episode, 6 if it is a Mixed Episode, 5 if it is a Major Depressive Episode, and 7 if the current or most recent episode is Unspecified.
3. The fifth digit (except for Bipolar I Disorder, Most Recent Episode Hypomanic, and Bipolar I Disorder, Most Recent Episode Unspecified) indicates the following: 1 for Mild severity, 2 for Moderate severity, 3 for Severe Without Psychotic Features, 4 for Severe With Psychotic Features, 5 for in Partial Remission, 6 for in Full Remission, and 0 if Unspecified. Other specifiers for Bipolar I Disorder cannot be coded.
For Bipolar I Disorder, Most Recent Episode Hypomanic, the fifth digit is always 0. For Bipolar Disorder, Most Recent Episode Unspecified, there is no fifth digit.
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I hope that this helps.
Mari