ICD-9-CM diagnosis code (retired)
971.9 — Poisoning by unspecified drug primarily affecting autonomic nervous system
About ICD-9-CM 971.9
971.9 is an ICD-9-CM diagnosis code for poisoning by unspecified drug primarily affecting autonomic nervous system. ICD-9-CM was retired for U.S. claims on October 1, 2015, when ICD-10-CM took over.
The CMS General Equivalence Mappings translate it to 8 ICD-10-CM codes, such as T44.901A (Poisoning by unspecified drugs primarily affecting the autonomic nervous system, accidental (unintentional), initial encounter), T44.902A (Poisoning by unspecified drugs primarily affecting the autonomic nervous system, intentional self-harm, initial encounter) and T44.903A (Poisoning by unspecified drugs primarily affecting the autonomic nervous system, assault, initial encounter). All of these are approximate matches, so review the record to pick the right one.
ICD-10-CM equivalents
- T44.901APoisoning by unspecified drugs primarily affecting the autonomic nervous system, accidental (unintentional), initial encounterapproximate
- T44.902APoisoning by unspecified drugs primarily affecting the autonomic nervous system, intentional self-harm, initial encounterapproximate
- T44.903APoisoning by unspecified drugs primarily affecting the autonomic nervous system, assault, initial encounterapproximate
- T44.904APoisoning by unspecified drugs primarily affecting the autonomic nervous system, undetermined, initial encounterapproximate
- T44.991APoisoning by other drug primarily affecting the autonomic nervous system, accidental (unintentional), initial encounterapproximate
- T44.992APoisoning by other drug primarily affecting the autonomic nervous system, intentional self-harm, initial encounterapproximate
- T44.993APoisoning by other drug primarily affecting the autonomic nervous system, assault, initial encounterapproximate
- T44.994APoisoning by other drug primarily affecting the autonomic nervous system, undetermined, initial encounterapproximate
Common questions about 971.9
GEMs are a translation aid, not a substitute for coding from the record. The 2027 ICD-10 code set has changed since the last GEMs release in 2018. Page updated September 29, 2026.