T61.781A – Other shellfish poisoning, accidental (unintentional), initial encounter

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

Billable code

ICD-10-CM code T61.781A

Code: T61.781A (claims format: T61781A)
Description: Other shellfish poisoning, accidental (unintentional), initial encounter
Short description: Oth shellfish poisoning, accidental (unintentional), init
Billable: Yes – valid for HIPAA-covered transactions
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: T61 › T61.7 › T61.78 › T61.781

7th character values

Codes in this category need a 7th character to describe the encounter or episode of care.

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

Notes inherited from parent codes

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

T61 – Toxic effect of noxious substances eaten as seafood

Excludes1 (not coded here):

allergic reaction to food, such as:
anaphylactic reaction or shock due to adverse food reaction (T78.0-)
bacterial foodborne intoxications (A05.-)
dermatitis (L23.6, L25.4, L27.2)
food protein-induced enterocolitis syndrome (K52.21)
food protein-induced enteropathy (K52.22)
gastroenteritis (noninfective) (K52.29)
toxic effect of aflatoxin and other mycotoxins (T64)
toxic effect of cyanides (T65.0-)
toxic effect of harmful algae bloom (T65.82-)
toxic effect of hydrogen cyanide (T57.3-)
toxic effect of mercury (T56.1-)
toxic effect of red tide (T65.82-)

7th character note:

The appropriate 7th character is to be added to each code from category T61

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 T61.781

Frequently asked questions

What is ICD-10 code T61.781A?

T61.781A is the ICD-10-CM code for other shellfish poisoning, accidental (unintentional), initial encounter, in the block T51-T65 (Toxic effects of substances chiefly nonmedicinal as to source).

Is T61.781A a billable code?

Yes. T61.781A is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does T61.781A belong to?

It belongs to category T61 – Toxic effect of noxious substances eaten as seafood.

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.