Exposure to other forces of nature (X39)

The ICD-10 code X39 covers medical situations involving exposure to various natural forces or environmental conditions. It includes specific codes for exposure to natural radiation like radon and solar radiation, as well as other natural phenomena such as wind, hail, drought, or meteorite impacts.

This section is used to document injuries or health effects linked to natural environmental hazards. For example, X39.01 codes exposure to radon gas, a natural radioactive element, while X39.08 applies to other natural radiation exposures like solar radiation storms. The code X39.8 addresses a wide range of other forces of nature such as downbursts, acid rain, or extreme weather conditions including droughts and high winds. Different seventh character extensions specify whether it’s the initial encounter, a subsequent visit, or a sequela (late effects). Knowing these codes helps correctly capture events where the patient’s condition results from exposure to specific natural forces, supporting precise health records and statistical tracking of environmental injury causes.

Instructional Notations

7th Character Note

Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.

  • The appropriate 7th character is to be added to each code from category X39

7th Character

Indicates that a seventh character is to be assigned to codes in a subcategory.

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Clinical Terms

The following clinical terms provide additional context, helping users better understand the clinical background and common associations for each diagnosis listed in this section. Including related terms alongside ICD-10-CM codes supports coders, billers, and healthcare professionals in improving accuracy, enhancing documentation, and facilitating research or patient education.

Acid Rain

Acidic water usually pH 2.5 to 4.5, which poisons the ecosystem and adversely affects plants, fishes, and mammals. It is caused by industrial pollutants, mainly sulfur oxides and nitrogen oxides, emitted into the atmosphere and returning to earth in the form of acidic rain water.