ICD-10-CM Codes
V00-Y99
W85-W99
W99-
2023 ICD-10-CM Diagnosis Code W99

2023 ICD-10-CM Diagnosis Code W99

Exposure to other man-made environmental factors

2016

2017

2018

2019

2020

2021

2022

2023

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 2023 edition of ICD-10-CM W99 became effective on October 1, 2022.
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
2023 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
2023 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
2021 (effective 10/1/2020): No change
2022 (effective 10/1/2021): No change
2023 (effective 10/1/2022): 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
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 2021 2022 2023 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 2021 2022 2023 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.

2023 ICD-10-CM Diagnosis Code W99

Exposure to other man-made environmental factors

External causes of morbidity

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

Exposure to other specified factors

Exposure to other specified factors

Exposure to other specified factors