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ICD-10/T51.1X

T51.1X ICD-10-CM Code: Toxic effect of methanol

Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.

Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.

Official Registry Overview & Definition

Toxic effect of methanol is a non-billable ICD-10-CM category code (T51.1X). A more specific billable subcode must be selected for claims submission.

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for T51.1X in the official ICD-10-CM tabular list.

Excludes1 — Not Coded Here

Conditions that can never be reported with this code; the two are mutually exclusive.

  • contact with and (suspected) exposure to toxic substances (Z77.-)

Use Additional Code

Supplementary codes the tabular list directs you to add.

  • Use additional code(s):
  • for all associated manifestations of toxic effect, such as: respiratory conditions due to external agents (J60-J70)
  • personal history of foreign body fully removed (Z87.821)
  • to identify any retained foreign body, if applicable (Z18.-)

Frequently Asked Questions (FAQ) & Clinical Guidance

Can T51.1X be billed directly?

No. T51.1X (Toxic effect of methanol) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.

Does T51.1X require a 7th character?

Yes. The appropriate 7th character is to be added to each code from category T51.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to T51.1X in its code family, with their registry titles.

  • T51.0X4 — Toxic effect of ethanol, undetermined
  • T51.0X4A — Toxic effect of ethanol, undetermined, initial encounter
  • T51.0X4D — Toxic effect of ethanol, undetermined, subsequent encounter
  • T51.0X4S — Toxic effect of ethanol, undetermined, sequela
  • T51.1 — Toxic effect of methanol
  • T51.1X1 — Toxic effect of methanol, accidental (unintentional)
  • T51.1X1A — Toxic effect of methanol, accidental (unintentional), initial encounter
  • T51.1X1D — Toxic effect of methanol, accidental (unintentional), subsequent encounter
  • T51.1X1S — Toxic effect of methanol, accidental (unintentional), sequela
  • T51.1X2 — Toxic effect of methanol, intentional self-harm

View all codes in the T51 family