Exposure to other specified factors (X58) ICD-10-CM
The X58 code range covers exposure to other specified factors with 4 ICD-10-CM diagnosis codes. 3 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
- Accident NOS
- Exposure NOS
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 code X58
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
- A - initial encounter
- D - subsequent encounter
- S - sequela
Codes in the X58 Range 4 codes · 3 billable
About the X58 Code Range
The ICD-10 code X58 is used to classify medical cases involving exposure to a wide range of other specified harmful factors that are not classified elsewhere. These codes capture incidents from accidental contact with environmental elements, biological agents, chemical exposure, to ingestion of toxic substances.
Specifically, the codes under X58 cover conditions such as exposure to extreme temperatures, poisonous plants or animals, chemical agents like insecticides or cleaning products, and various accidental ingestions of toxic substances or contaminated food. Synonyms and related terms for these exposures include accidental ingestion of toxic berries, contact with venomous spiders, exposure to magnetic fields, and injuries caused by environmental factors like pressure changes during diving. The classification includes the initial encounter (X58.XXXA), subsequent encounters (X58.XXXD), and sequela or long-term effects (X58.XXXS). This ICD-10 code is essential for coding incidents involving exposure to numerous specified hazards not covered by other codes, helping medical coders accurately document accidental and environmental exposure-related injuries or conditions.
Questions About This Page
How many billable codes are in the X58 range?
Of the 4 codes in this range, 3 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the X58 range classify?
The range classifies exposure to other specified factors. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
