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X58 ICD-10-CM Code: Exposure to other specified factors

Compare with another code for X58Check this code on a claim

Billing Status: NO. This is a non-billable ICD-10-CM code: report a more specific billable code beneath it.

Coding at a Glance

7th character
Required — characters A · D · S
Tabular directives
2 inclusion terms

Category · FY2027A non-billable heading in the tabular list: report a more specific code beneath it.

What you need to know

Source: CMS/NCHS Official ICD-10-CM tabular notes, quoted. From the CMS/NCHS tabular list for the release in force. A note the category or block publishes applies to this code too; the Instructions section marks which is which.

IncludesWhat this code covers
  • Accident NOS
  • Exposure NOS

Where it sits Source: CMS/NCHS

Under:Chapter 20: External Causes of MorbidityV00-X58 AccidentsW00-X58 Other external causes of accidental injuryX52-X58 Accidental exposure to other specified factors

Codes under X58 (3)

  • X58.XXXAExposure to other specified factors, initial encounterBillable
  • X58.XXXDExposure to other specified factors, subsequent encounterBillable
  • X58.XXXSExposure to other specified factors, sequelaBillable

CompareCheck ClaimView Related Codes

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for X58 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2027Effective: October 1, 2026

Trace:FY2027 changesChange historyRelease, file and checksum

Inclusion Terms

Alternative terms the tabular list files under this code.

  • Accident NOS
  • Exposure NOS

7th Character Guide

"The appropriate 7th character is to be added to code X58"

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

How the encounter character is assigned. “Initial encounter” means the patient is receiving active treatment for the condition — it is not limited to the first visit, and a different or new provider giving active treatment still assigns it. “Subsequent encounter” covers care during the healing or recovery phase after active treatment. “Sequela” is for complications or conditions that arise as a direct result of the original condition.

ICD-10-CM Official Guidelines for Coding and Reporting, Section I.C.19.a (paraphrased by MedCoder).

Variant codes in this family

X58.XXXA, X58.XXXD, X58.XXXS

Character meanings are CMS's official 7th-character extensions for this family, as carried in each variant code's official description; variant codes are registry rows. The explanation of how the encounter character is assigned is MedCoder editorial, distinct from the official content above it.

Coder workflow for X58

MedCoder structured workflow — derived from this code’s own official record

Before you code X58

  1. X58 is not reportable as written. Select the more specific code beneath it that the documentation supports. Codes are reported to the highest level of specificity the classification provides (Guidelines I.B.2).

    ReviewX58.XXXA, X58.XXXD, X58.XXXS

    See the relationships section · Guide: How to choose an ICD-10-CM code →

  2. A 7th character is required in this family. Confirm the documented encounter: initial (active treatment), subsequent (healing or recovery phase), or sequela. X58 is not valid without one. “Initial” means active treatment, not the first visit (Guidelines I.C.19.a).

    See the 7th Character Guide · Guide: 7th characters: initial, subsequent, sequela →

  3. An external cause code is reported in addition to the code for the injury or condition, never as the principal or first-listed diagnosis. Confirm the cause, intent, place of occurrence, activity and status where the record documents them, and assign the 7th character that matches the injury code. External cause coding guidelines (Guidelines I.C.20.a).

Choose the right path

  1. Does the documentation support one of the more specific codes beneath X58?
    Yes → Select that code and continue the checks below on its own page.
    No → X58 cannot be reported as written. Where the codes beneath it include an unspecified code, that code applies when the record goes no further; otherwise query for the missing detail.

    ReviewX58.XXXA, X58.XXXD, X58.XXXS

  2. Is the encounter phase documented — active treatment, healing or recovery, or a sequela?
    Yes → Assign the matching 7th character; the variant codes are in the 7th Character Guide.
    No → The code is invalid without its 7th character — query for the missing element.

Report the code beneath X58 that the documentation supports, not X58 itself. Then confirm that code is valid for the date of service on its own page.

Documentation check

The provider’s diagnostic statement
Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).
Encounter type
Active treatment, healing or recovery phase, or sequela — the basis of the 7th character (Guidelines I.C.19.a).
Any detail beyond this code’s title
What the record states that a more specific code would capture — or its absence, which itself supports the unspecified code.

Coding decision scenarios

Pattern scenarios for this code’s structure — decision rules, not clinical cases

Documentation: The patient returns during the healing or recovery phase after active treatment of the same condition.

Coding question: Which 7th character applies?

Path: Review the official 7th-character definitions for this family in the 7th Character Guide.

Reason: “Initial encounter” means active treatment, not the first visit; care during recovery takes “subsequent encounter”, and a complication arising from the original condition takes “sequela” (Guidelines I.C.19.a).

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Don’t confuse X58 with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of X58 — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

  • X58.XXXA— Encounter relationship (Review)

    Same underlying diagnosis, different encounter phase.

    The same diagnosis at a different phase of care; one encounter takes one 7th character.

    What moves you there: Documentation of a initial encounter moves the case to X58.XXXA.

    Full comparison: X58 vs X58.XXXA →

  • X58.XXXD— Encounter relationship (Review)

    Same underlying diagnosis, different encounter phase.

    The same diagnosis at a different phase of care; one encounter takes one 7th character.

    What moves you there: Documentation of a subsequent encounter moves the case to X58.XXXD.

    Full comparison: X58 vs X58.XXXD →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Coding context

Guidelines, coding notes, decision aids, relationships (with MS-DRG and CCSR classification), hierarchy, HCC, coverage and the context map: what a coder reaches for after the core. Each section names whether it is official source data, a MedCoder-derived relationship or MedCoder editorial.

Code Overview

Exposure to other specified factors is a non-billable ICD-10-CM category code (X58). A more specific billable subcode must be selected for claims submission.

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Verify Before Coding

  • Not billable as written — a more specific code is required: X58.XXXA, X58.XXXD, X58.XXXS.
  • Requires a 7th character. "The appropriate 7th character is to be added to code X58" Options: X58.XXXA, X58.XXXD, X58.XXXS
  • Principal-diagnosis restriction. External cause of morbidity codes (V, W, X and Y) describe the circumstance that caused an injury, not the condition treated. The Medicare Code Editor rejects them as a principal diagnosis; sequence the injury or condition first and report this code as secondary.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Contextual Map

Every relationship of X58 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Hierarchy

External cause index (81)

  • Abandonment NEC (causing exposure to weather conditions) (with intent to injure or kill)[External cause term]— CMS External Cause of Injuries Index · icd10cm-fy2027
  • Abuse (adult) (child) (mental) (physical) (sexual)[External cause term]— CMS External Cause of Injuries Index · icd10cm-fy2027
  • Accident (to)[External cause term]— CMS External Cause of Injuries Index · icd10cm-fy2027
  • Accident (to), caused by, due to, environmental factor NEC[External cause term]— CMS External Cause of Injuries Index · icd10cm-fy2027
  • Accident (to), caused by, due to, natural factor NEC[External cause term]— CMS External Cause of Injuries Index · icd10cm-fy2027
  • Accident (to), specified cause NEC[External cause term]— CMS External Cause of Injuries Index · icd10cm-fy2027
  • Arachnidism, arachnoidism[External cause term]— CMS External Cause of Injuries Index · icd10cm-fy2027
  • Battered (baby) (child) (person) (syndrome)[External cause term]— CMS External Cause of Injuries Index · icd10cm-fy2027
  • and 73 more

Nearest codes

Change history

  • FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Reference

Index terms and tables, published questions and FAQ, every source behind this page with its release and checksum, the date-of-service check and the complete change history.

Indexed As (81)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Circumstance phrases from the official ICD-10-CM External Cause of Injuries Index that map to this code.

  • Abandonment NEC (causing exposure to weather conditions) (with intent to injure or kill)
  • Abuse (adult) (child) (mental) (physical) (sexual)
  • Accident (to)
  • Accident (to), caused by, due to, environmental factor NEC
  • Accident (to), caused by, due to, natural factor NEC
  • Accident (to), specified cause NEC
  • Arachnidism, arachnoidism
  • Battered (baby) (child) (person) (syndrome)
  • Blow
  • Casualty NEC (not due to war)
  • Contact (accidental), with, bee (s)
  • Contact (accidental), with, caterpillar (venomous)
  • Contact (accidental), with, centipede (venomous)
  • Contact (accidental), with, cobra
  • Contact (accidental), with, coral
  • Contact (accidental), with, fer de lance
  • Contact (accidental), with, Gila monster
  • Contact (accidental), with, hornet (s)
  • Contact (accidental), with, rattlesnake
  • Contact (accidental), with, scorpion
  • Contact (accidental), with, sea, anemone, cucumber or urchin (spine)
  • Contact (accidental), with, spider (venomous)
  • Contact (accidental), with, tarantula
  • Contact (accidental), with, venomous, animal
  • Contact (accidental), with, venomous, arthropods
  • Contact (accidental), with, venomous, lizard
  • Contact (accidental), with, venomous, marine animal NEC
  • Contact (accidental), with, venomous, marine plant NEC
  • Contact (accidental), with, venomous, millipedes (tropical)
  • Contact (accidental), with, venomous, plant (s)
  • Contact (accidental), with, venomous, snake
  • Contact (accidental), with, venomous, spider
  • Contact (accidental), with, viper
  • Contact (accidental), with, wasp
  • Contact (accidental), with, yellow jacket
  • Cruelty (mental) (physical) (sexual)
  • Crushed (accidentally)
  • Decapitation NEC (accidental circumstances)
  • Dehydration from lack of water
  • Deprivation
  • Desertion
  • Destitution
  • Exposure (to)
  • Exposure (to), due to abandonment or neglect
  • Exposure (to), environmental tobacco smoke
  • Exposure (to), factor NOS (s)
  • Exposure (to), factor NOS (s), environmental NEC
  • Exposure (to), factor NOS (s), specified NEC
  • Exposure (to), specified factors NEC
  • Found injured
  • Fracture (circumstances unknown or unspecified)
  • Fracture (circumstances unknown or unspecified), due to specified cause NEC
  • Hunger
  • Inanition (from) (hunger)
  • Inanition (from) (hunger), thirst
  • Inattention after, at birth (homicidal intent) (infanticidal intent)
  • Ingestion, poisonous, plant (s)
  • Injury, injured NOS (accidental(ly))
  • Injury, injured NOS (accidental(ly)), inflicted (by), other person, stated as, accidental
  • Injury, injured NOS (accidental(ly)), self-inflicted, stated as accidental
  • Injury, injured NOS (accidental(ly)), specified cause NEC
  • Insufficient nourishment
  • Killed, killing NOS (accidentally)
  • Killed, killing NOS (accidentally), self, stated as, accident NOS
  • Knocked down NOS (accidentally) (by)
  • Lack of, care (helpless person) (infant) (newborn)
  • Lack of, food except as result of abandonment or neglect
  • Lack of, food except as result of abandonment or neglect, due to abandonment or neglect
  • Lack of, water except as result of transport accident
  • Lack of, water except as result of transport accident, helpless person, infant, newborn
  • Mangled NOS (accidentally)
  • Mental cruelty
  • Neglect (criminal) (homicidal intent)
  • Poisoning (accidental) (by), by plant, thorns, spines, sharp leaves or other mechanisms NEC
  • Poisoning (accidental) (by), caused by injection of poisons into skin by plant thorns, spines, sharp leaves
  • Poisoning (accidental) (by), caused by injection of poisons into skin by plant thorns, spines, sharp leaves, marine or sea plants (venomous)
  • Privation (food) (water)
  • Starvation
  • Thirst
  • Torture
  • Wound NEC (accidental)

Common coding questions

MedCoder editorial

Can X58 be billed directly?

No. X58 (Exposure to other specified factors) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.

Does X58 require a 7th character?

Yes. The appropriate 7th character is to be added to code X58; A: initial encounter; D: subsequent encounter; S: sequela.

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2027 tabular list, index and tables, effective October 1, 2026 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v44.0 (October 2026) Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder-derived relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder editorial explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources

Labels on this page: Official source data · MedCoder-derived relationship · MedCoder editorial explanation. How to read the labels · All data sources and release dates · CMS coding rules

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "X58 — Exposure to other specified factors." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/x58-exposure-to-other-specified-factors

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Exposure to other specified factors

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027, and none are recorded for this code. Note changes are tracked from FY2027 only.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to X58 in its code family, with their registry titles.