T51.1 – Toxic effect of methanol

ICD-10-CM 2027 diagnosis code · Toxic effects of substances chiefly nonmedicinal as to source

Non-billable header

ICD-10-CM code T51.1

Code: T51.1 (claims format: T511)
Description: Toxic effect of methanol
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 19. Injury, poisoning and certain other consequences of external causes (S00-T88)
Block: T51-T65 Toxic effects of substances chiefly nonmedicinal as to source
Parent codes: T51

Billable codes under T51.1

T51.1 is a header code and cannot be used on claims. Choose the most specific code:

T51.1X – Toxic effect of methanolHeader (more codes below)

7th character values

Codes in this category need a 7th character to describe the encounter or episode of care (use placeholder X for empty positions).

Character	Meaning
`A`	initial encounter
`D`	subsequent encounter
`S`	sequela

Notes for T51.1

Applicable to:

Toxic effect of methyl alcohol

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

T51 – Toxic effect of alcohol

7th character note:

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

Block T51-T65

Excludes1 (not coded here):

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

Use additional code:

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.-)

Notes:

When no intent is indicated code to accidental. Undetermined intent is only for use when there is specific documentation in the record that the intent of the toxic effect cannot be determined.

Related codes in T51

T51.0 – Toxic effect of ethanolHeader
T51.2 – Toxic effect of 2-PropanolHeader
T51.3 – Toxic effect of fusel oilHeader
T51.8 – Toxic effect of other alcoholsHeader
T51.9 – Toxic effect of unspecified alcoholHeader

Frequently asked questions

What is ICD-10 code T51.1?

T51.1 is the ICD-10-CM code for toxic effect of methanol, in the block T51-T65 (Toxic effects of substances chiefly nonmedicinal as to source).

Is T51.1 a billable code?

No. T51.1 is a header code with more specific child codes; report one of the billable codes listed above.

What category does T51.1 belong to?

It belongs to category T51 – Toxic effect of alcohol.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.