2020 ICD-10-CM Diagnosis Code W99

Exposure to other man-made environmental factors

    2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
  • W99 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2020 edition of ICD-10-CM W99 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of W99 - other international versions of ICD-10 W99 may differ.
ICD-10-CM Coding Rules
  • W99 describes the circumstance causing an injury, not the nature of the injury.
The following code(s) above W99 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to W99:
  • V00-Y99
    2020 ICD-10-CM Range V00-Y99

    External causes of morbidity

    Note
    • This chapter permits the classification of environmental events and circumstances as the cause of injury, and other adverse effects. Where a code from this section is applicable, it is intended that it shall be used secondary to a code from another chapter of the Classification indicating the nature of the condition. Most often, the condition will be classifiable to Chapter 19, Injury, poisoning and certain other consequences of external causes (S00-T88). Other conditions that may be stated to be due to external causes are classified in Chapters I to XVIII. For these conditions, codes from Chapter 20 should be used to provide additional information as to the cause of the condition.
    External causes of morbidity
  • W85-W99
    2020 ICD-10-CM Range W85-W99

    Exposure to electric current, radiation and extreme ambient air temperature and pressure

    Type 1 Excludes
    • exposure to:
    • failure in dosage of radiation or temperature during surgical and medical care (Y63.2-Y63.5)
    • lightning (T75.0-)
    • natural cold (X31)
    • natural heat (X30)
    • natural radiation NOS (X39)
    • radiological procedure and radiotherapy (Y84.2)
    • sunlight (X32)
    Exposure to electric current, radiation and extreme ambient air temperature and pressure
Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change

External Cause Index entries containing back-references to W99:
  • Exposure (to) X58
    ICD-10-CM Diagnosis Code X58

    Exposure to other specified factors

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Applicable To
    • Accident NOS
    • Exposure NOS
    • factor(s) X58
      ICD-10-CM Diagnosis Code X58

      Exposure to other specified factors

        2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
      Applicable To
      • Accident NOS
      • Exposure NOS
      • environmental NEC X58
        ICD-10-CM Diagnosis Code X58

        Exposure to other specified factors

          2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
        Applicable To
        • Accident NOS
        • Exposure NOS
        • man-made NEC W99

ICD-10-CM Codes Adjacent To W99
W94.31XD …… subsequent encounter
W94.31XS …… sequela
W94.32 Exposure to high air pressure from rapid descent in water
W94.32XA …… initial encounter
W94.32XD …… subsequent encounter
W94.32XS …… sequela
W94.39 Exposure to other rapid changes in air pressure during descent
W94.39XA …… initial encounter
W94.39XD …… subsequent encounter
W94.39XS …… sequela
W99 Exposure to other man-made environmental factors
W99.XXXA Exposure to other man-made environmental factors, initial encounter
W99.XXXD Exposure to other man-made environmental factors, subsequent encounter
W99.XXXS Exposure to other man-made environmental factors, sequela
X00 Exposure to uncontrolled fire in building or structure
X00.0 Exposure to flames in uncontrolled fire in building or structure
X00.0XXA …… initial encounter
X00.0XXD …… subsequent encounter
X00.0XXS …… sequela
X00.1 Exposure to smoke in uncontrolled fire in building or structure
X00.1XXA …… initial encounter

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.