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ICD-10-CM 2027 diagnosis code

T61.783AOther shellfish poisoning, assault, initial encounter

✓ Billable / specificRequires 7th character

T61.783A is a valid, billable ICD-10-CM code for other shellfish poisoning, assault, initial encounter. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About T61.783A

T61.783A is the ICD-10-CM diagnosis code for other shellfish poisoning, assault, initial encounter. It belongs to category T61 (toxic effect of noxious substances eaten as seafood), block T51-T65 (toxic effects of substances chiefly nonmedicinal as to source) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

The 7th character "A" means initial encounter: use it while the patient is receiving active treatment for the condition.

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 917 (Poisoning and Toxic Effects of Drugs with MCC, relative weight 1.57) and DRG 918 (Poisoning and Toxic Effects of Drugs without MCC, relative weight 0.872), in MDC 21 (Injuries, Poisonings and Toxic Effects of Drugs), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 988.0 (toxic effect of fish and shellfish eaten as food) and E962.1 (assault by other solid and liquid substances).

7th character

Ainitial encounter

Other encounter types for T61.783:

Notes that apply from higher levels

Instructions written at a parent level also apply to T61.783A.

› From T61 Toxic effect of noxious substances eaten as seafood
Excludes1
  • 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-)

Broader instructions also apply from T51-T65 Toxic effects of substances chiefly nonmedicinal as to source and Chapter 19: Injury, poisoning and certain other consequences of external causes.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 988.0Toxic effect of fish and shellfish eaten as foodapproximate, combination
  • E962.1Assault by other solid and liquid substancesapproximate, combination

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about T61.783A

Is T61.783A billable?

Yes. T61.783A is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

What does the "A" at the end of T61.783A mean?

It is the 7th character for initial encounter. Per the official guidelines, use it while the patient is receiving active treatment for the condition.

Can T61.783A be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict T61.783A as a principal diagnosis.

Is T61.783A a CC or MCC?

No. T61.783A is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does T61.783A group to?

T61.783A is used in the MS-DRG v44.0 logic for MS-DRG 917 (Poisoning and Toxic Effects of Drugs with MCC) and MS-DRG 918 (Poisoning and Toxic Effects of Drugs without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for T61.783A?

The CMS General Equivalence Mappings map T61.783A to ICD-9-CM 988.0 and E962.1.