Both describe a substance use disorder using the same general criteria structure (impaired control, social impairment, risky use, physiological effects); the distinction is simply which substance is involved and whether it fits one of the ten specifically named classes.
Onset patterns for both depend on the substance and individual risk factors; there is no structural difference in how the disorder develops based on which category it falls under.
Both use the same general course and severity framework based on symptom count (mild/moderate/severe) rather than any duration difference tied to the category itself.
Associated features are substance-specific in both cases — for example, distinct physical and mood-related effects of anabolic-androgenic steroid use differ substantially from alcohol's associated features, even though the diagnostic structure is the same.
Both can produce severe impairment, up to and including significant medical and psychosocial consequences; severity is scored the same way (mild/moderate/severe by symptom count) regardless of which category applies.
Before using the 'Other (or Unknown)' category, use of one of the ten specifically named substance classes (including alcohol) should be ruled out, since named categories always take precedence when the substance is identified and fits one of them.
The key differential question is simply which substance is involved: if it is alcohol, Alcohol Use Disorder applies; if it is a substance outside the ten named classes (such as anabolic-androgenic steroids) or unidentified, the 'Other (or Unknown)' category applies.
'Other (or Unknown) Substance-Related Disorder' is sometimes mistaken for a vague, low-specificity label, when it in fact requires the same diagnostic rigor as Alcohol Use Disorder — simply applied to a different (or undetermined) substance.
Escalating anabolic-androgenic steroid use with unsuccessful attempts to cut down and continued use despite side effects points to the 'Other' category; escalating alcohol consumption with the same functional pattern points to Alcohol Use Disorder.
| Feature | Other (or Unknown) Substance-Related Disorders | Alcohol Use Disorder |
|---|---|---|
| Substance class | Other/Unknown: outside the ten named classes, or unidentified | Alcohol: one of the ten specifically named classes |
| Diagnostic criteria structure | Same general substance use disorder structure | Same general substance use disorder structure |
| Associated physiological effects | Substance-specific (e.g., steroid-related effects) | Alcohol-specific (e.g., withdrawal seizures, liver effects) |
A residual category covering substance use disorders, intoxication, and withdrawal involving a substance not covered by the ten specifically named classes in this chapter (such as anabolic steroids, nitrous oxide, or other over-the-counter or unknown substances), or presentations where the specific substance cannot be identified.
A problematic pattern of alcohol use leading to clinically significant impairment or distress, assessed across a cluster of behavioral, physiological, and craving-related indicators within a 12-month period.