W85-W99 ICD-10-CM Code: Exposure to electric current, radiation and extreme ambient air temperature and pressure

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for W85-W99 in the official ICD-10-CM tabular list, quoted as published.

Don’t confuse W85-W99 with…

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

The codes most likely to be picked instead of W85-W99 — 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.

• Y63.2— Excludes1 conflict (Conflict)

  Not coded here — these two are mutually exclusive.

  Not reported together with this code, except where the two conditions are documented as unrelated.

  What moves you there: Documentation of failure in dosage of radiation or temperature during surgical and medical care moves the case to Y63.2; the two are not reported together unless documented as unrelated.

  Full comparison: W85-W99 vs Y63.2 →

• Y63.5— Excludes1 conflict (Conflict)

  Not coded here — these two are mutually exclusive.

  Not reported together with this code, except where the two conditions are documented as unrelated.

  What moves you there: Documentation of failure in dosage of radiation or temperature during surgical and medical care moves the case to Y63.5; the two are not reported together unless documented as unrelated.

  Full comparison: W85-W99 vs Y63.5 →

• T75.0— Excludes1 conflict (Conflict)

  Not coded here — these two are mutually exclusive.

  Not reported together with this code, except where the two conditions are documented as unrelated.

  What moves you there: Documentation of lightning moves the case to T75.0; the two are not reported together unless documented as unrelated.

  Full comparison: W85-W99 vs T75.0 →

• X31— Excludes1 conflict (Conflict)

  Not coded here — these two are mutually exclusive.

  Not reported together with this code, except where the two conditions are documented as unrelated.

  What moves you there: Documentation of natural cold moves the case to X31; the two are not reported together unless documented as unrelated.

  Full comparison: W85-W99 vs X31 →

• X30— Excludes1 conflict (Conflict)

  Not coded here — these two are mutually exclusive.

  Not reported together with this code, except where the two conditions are documented as unrelated.

  What moves you there: Documentation of natural heat moves the case to X30; the two are not reported together unless documented as unrelated.

  Full comparison: W85-W99 vs X30 →

• X39— Excludes1 conflict (Conflict)

  Not coded here — these two are mutually exclusive.

  Not reported together with this code, except where the two conditions are documented as unrelated.

  What moves you there: Documentation of natural radiation NOS moves the case to X39; the two are not reported together unless documented as unrelated.

  Full comparison: W85-W99 vs X39 →

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.

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 FY2026 tabular list, index and tables, effective October 1, 2025 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 structured 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 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.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Nearest Codes in This Family

Official ICD-10-CM classifications closest to W85-W99 in its code family, with their registry titles.

• W85 — Exposure to electric transmission lines
• W86 — Exposure to other specified electric current
• W88 — Exposure to ionizing radiation
• W89 — Exposure to man-made visible and ultraviolet light
• W90 — Exposure to other nonionizing radiation
• W92 — Exposure to excessive heat of man-made origin
• W93 — Exposure to excessive cold of man-made origin
• W94 — Exposure to high and low air pressure and changes in air pressure
• W99 — Exposure to other man-made environmental factors