T61.91XS ICD-10-CM Code: Toxic effect of unspecified seafood, accidental (unintentional), sequela
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 922 — OTHER INJURY, POISONING AND TOXIC EFFECT DIAGNOSES WITH MCC (MDC 21)
- MS-DRG 923 — OTHER INJURY, POISONING AND TOXIC EFFECT DIAGNOSES 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 T61.91XS 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.
- 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-)
- 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
Does T61.91XS require a 7th character?
Yes. The appropriate 7th character is to be added to each code from category T61.
Nearest Codes in This Family
Official ICD-10-CM classifications closest to T61.91XS in its code family, with their registry titles.
- T61.8X4S — Toxic effect of other seafood, undetermined, sequela
- T61.9 — Toxic effect of unspecified seafood
- T61.91 — Toxic effect of unspecified seafood, accidental (unintentional)
- T61.91XA — Toxic effect of unspecified seafood, accidental (unintentional), initial encounter
- T61.91XD — Toxic effect of unspecified seafood, accidental (unintentional), subsequent encounter
- T61.92 — Toxic effect of unspecified seafood, intentional self-harm
- T61.92XA — Toxic effect of unspecified seafood, intentional self-harm, initial encounter
- T61.92XD — Toxic effect of unspecified seafood, intentional self-harm, subsequent encounter
- T61.92XS — Toxic effect of unspecified seafood, intentional self-harm, sequela
- T61.93 — Toxic effect of unspecified seafood, assault