Is T61.9 a billable ICD-10-CM code?

No. T61.9 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does T61.9 sit in the tabular list?

Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Toxic effects of substances chiefly nonmedicinal as to source (T51-T65).

What cannot be coded together with T61.9?

T61.9 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above T61.9 (T61) and apply to it just the same.

T61.9

T61.9 — Toxic effect of unspecified seafood

Non-billable headerICD-10-CM

T61.9 is a non-billable header ICD-10-CM code for toxic effect of unspecified seafood. It cannot be billed on its own: choose one of the more specific child codes below. This code also requires a 7th character before it is complete.

This code requires a 7th character

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

A: initial encounter
D: subsequent encounter
S: sequela

Excludes1 inherited from the categories above T61.9

These are not written on T61.9, but they bind it: a note on a category applies to every code beneath it. Billing T61.9 with anything listed here is a denial.

Written on T61 — Toxic effect of noxious substances eaten as seafood

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-)

Risk adjustment

T61.9 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Code history

T61.9 has not changed since FY2024 — no addition, revision or deletion across the FY2024–FY2027 ICD-10-CM releases.

Code to one of these instead T61.9

4 child codes. Green means billable.

Related codes at this level

Codes that share T61. If T61.9 is not quite right, the correct code is usually one of these.

Questions about T61.9

Is T61.9 a billable ICD-10-CM code?: No. T61.9 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does T61.9 sit in the tabular list?: Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Toxic effects of substances chiefly nonmedicinal as to source (T51-T65).
What cannot be coded together with T61.9?: T61.9 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above T61.9 (T61) and apply to it just the same.