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ICD-9-CM diagnosis code (retired)

977.9 — Poisoning by unspecified drug or medicinal substance

ICD-9-CM was replaced by ICD-10 on October 1, 2015. These are the ICD-10-CM equivalents from the CMS General Equivalence Mappings.

About ICD-9-CM 977.9

977.9 is an ICD-9-CM diagnosis code for poisoning by unspecified drug or medicinal substance. 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 4 ICD-10-CM codes, such as T50.901A (Poisoning by unspecified drugs, medicaments and biological substances, accidental (unintentional), initial encounter), T50.902A (Poisoning by unspecified drugs, medicaments and biological substances, intentional self-harm, initial encounter) and T50.903A (Poisoning by unspecified drugs, medicaments and biological substances, assault, initial encounter). All of these are approximate matches, so review the record to pick the right one.

ICD-10-CM equivalents

Common questions about 977.9

What is the ICD-10 code for ICD-9 977.9?

The GEMs map 977.9 to ICD-10-CM T50.901A, T50.902A, T50.903A and T50.904A.

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.