W94.11XS ICD-10-CM Code: Exposure to residence or prolonged visit at high altitude, sequela
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.
Official Registry Overview & Definition
Exposure to residence or prolonged visit at high altitude, sequela is a billable ICD-10-CM diagnosis code (W94.11S).
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for W94.11XS in the official ICD-10-CM tabular list.
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- 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)
Frequently Asked Questions (FAQ) & Clinical Guidance
Does W94.11XS require a 7th character?
Yes. The appropriate 7th character is to be added to each code from category W94.
Nearest Codes in This Family
Official ICD-10-CM classifications closest to W94.11XS in its code family, with their registry titles.
- W94.0XXS — Exposure to prolonged high air pressure, sequela
- W94.1 — Exposure to prolonged low air pressure
- W94.11 — Exposure to residence or prolonged visit at high altitude
- W94.11XA — Exposure to residence or prolonged visit at high altitude, initial encounter
- W94.11XD — Exposure to residence or prolonged visit at high altitude, subsequent encounter
- W94.12 — Exposure to other prolonged low air pressure
- W94.12XA — Exposure to other prolonged low air pressure, initial encounter
- W94.12XD — Exposure to other prolonged low air pressure, subsequent encounter
- W94.12XS — Exposure to other prolonged low air pressure, sequela
- W94.2 — Exposure to rapid changes in air pressure during ascent