T50.91 Poisoning by, adverse effect of and underdosing of multiple unspecified drugs, medicaments and biological substances

The ICD-10-CM code for Poisoning by, adverse effect of and underdosing of multiple unspecified drugs, medicaments and biological substances is T50.91 (FY2026). It is a non-billable category code — select a more specific code below for claims.

Classification

Chapter

19: Injury, poisoning and certain other consequences of external causes (S00-T88)

Section

T36-T50: Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances (T36-T50)

Category T50

147 codes (114 billable)

FY2026 Status

Stable since FY2024

Inclusion Terms

• Multiple drug ingestion NOS

Official Coding Guidelines

Multiple unspecified substances: assign T50.91

If multiple unspecified drugs, medicinal or biological substances were taken, assign the appropriate code from subcategory T50.91, Poisoning by, adverse effect of and underdosing of multiple unspecified drugs, medicaments and biological substances.

Sequence blood vessel/nerve injury first (fragment)

injury is to the blood vessels or nerves, that injury should be sequenced first.

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool

Cite This Page

Reference T50.91 with the canonical source and edition:

T50.91 — Poisoning by, adverse effect of and underdosing of multiple unspecified drugs, medicaments and biological substances. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/T50.91

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