T56.91XA ICD-10-CM Code: Toxic effect of unspecified metal, accidental (unintentional), initial encounter
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Inpatient Payment Groups (MS-DRG)
MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0 (FY2026), Appendix B.
- MS-DRG 917 — POISONING AND TOXIC EFFECTS OF DRUGS WITH MCC (MDC 21)
- MS-DRG 918 — POISONING AND TOXIC EFFECTS OF DRUGS WITHOUT MCC (MDC 21)
A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.
Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.
Official Registry Overview & Definition
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for T56.91XA in the official ICD-10-CM tabular list.
Includes
Conditions the official ICD-10-CM tabular list includes under this code.
- toxic effects of fumes and vapors of metals
- toxic effects of metals from all sources, except medicinal substances
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- arsenic and its compounds (T57.0)
- manganese and its compounds (T57.2)
- contact with and (suspected) exposure to toxic substances (Z77.-)
Use Additional Code
Supplementary codes the tabular list directs you to add.
- Use additional code to identify any retained metal foreign body, if applicable (Z18.0-, T18.1-)
- 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
Does T56.91XA require a 7th character?
Yes. The appropriate 7th character is to be added to each code from category T56.
Nearest Codes in This Family
Official ICD-10-CM classifications closest to T56.91XA in its code family, with their registry titles.
- T56.894A — Toxic effect of other metals, undetermined, initial encounter
- T56.894D — Toxic effect of other metals, undetermined, subsequent encounter
- T56.894S — Toxic effect of other metals, undetermined, sequela
- T56.9 — Toxic effects of unspecified metal
- T56.91 — Toxic effect of unspecified metal, accidental (unintentional)
- T56.91XD — Toxic effect of unspecified metal, accidental (unintentional), subsequent encounter
- T56.91XS — Toxic effect of unspecified metal, accidental (unintentional), sequela
- T56.92 — Toxic effect of unspecified metal, intentional self-harm
- T56.92XA — Toxic effect of unspecified metal, intentional self-harm, initial encounter
- T56.92XD — Toxic effect of unspecified metal, intentional self-harm, subsequent encounter