T59.3X1A
Toxic effect of lacrimogenic gas, accidental (unintentional), initial encounter
This code does not map to a risk-adjusting HCC in the loaded models.
Coding notes
Excludes 1 never coded together · Excludes 2 may co-exist
Toxic effect of lacrimogenic gas NOS
Toxic effect of tear gas
contact with and (suspected) exposure to toxic substances (Z77.-)
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.-)
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.
code to identify any retained foreign body, if applicable (Z18.-)
Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes. (T07-T88) Injury, poisoning and certain other consequences of external causes (T07-T88) (T20-T32) Burns and corrosions (T20-T32) Includes: burns (thermal) from electrical heating appliances burns (thermal) from electricity burns (thermal) from flame burns (thermal) from friction burns (thermal) from hot air and hot gases burns (thermal) from hot objects burns (thermal) from lightning burns (thermal) from radiation chemical burn [corrosion] (external) (internal) scalds Excludes2: erythema [dermatitis] ab igne (L59.0) radiation-related disorders of the skin and subcutaneous tissue (L55-L59) sunburn (L55.-)
Official Guidelines for T59.3X1A
FY 2026 ›Subsections
- I.C.19.aApplication of 7th Characters in Chapter 19
- I.C.19.bCoding of Injuries
- I.C.19.cCoding of Traumatic Fractures
- I.C.19.dCoding of Burns and Corrosions
- I.C.19.eAdverse Effects, Poisoning, Underdosing and Toxic Effects
- I.C.19.fAdult and child abuse, neglect and other maltreatment
- I.C.19.gComplications of care
Sections that reference T59.3X1A
- I.C.19.eAdverse Effects, Poisoning, Underdosing and Toxic Effects
Codes in categories T36-T65 are combination codes that include the substance that was taken as well as the intent. …
- I.C.19.e.5)(d)Toxic Effects
… The toxic effect codes are in categories T51-T65. When coding a toxic effect, assign the toxic effect code first, followed by codes for all associated manifestations of the …
Sections whose FY 2026 text names T59.3X1A, its T59 category, or a range containing it — the chapter guidance above is the authoritative source.
In the Table of Drugs and Chemicals
11 substances map to T59.3X1A. If a chart lists more than one of them, they collapse onto this single code.
One of them: Brombenzylcyanide, column Poisoning Accidental (unintentional).
Brombenzylcyanide in every column
This row belongs to Brombenzylcyanide. Other substances sharing T59.3X1A may differ in the remaining columns — check the one in your documentation.
- Poisoning Accidental (unintentional)T59.3X10.000maps to no HCC category
- Poisoning Intentional self-harmT59.3X20.299HCC155maps to HCC155age >= 2
- Poisoning AssaultT59.3X30.000maps to no HCC category
- Poisoning UndeterminedT59.3X40.000maps to no HCC category
Billable forms: T59.3X1A · T59.3X1D · T59.3X1S — under CMS-HCC V28 only the A form risk-adjusts.
The column is chosen by the documentation, not by the coder. Intent follows the documented circumstance; adverse effect requires that the drug was correctly prescribed and properly administered (Guideline I.C.19.e). Coefficients are Community, Non-Dual, Aged under CMS-HCC V28 PY2027. How these figures were derived.