X31: Exposure to excessive natural cold
Codes under X31 (Exposure to excessive natural cold). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| X31.XXXA | Exposure to excessive natural cold, initial encounter | ✓ |
| X31.XXXA | Exposure to excessive natural cold, initial encounter | ✓ |
| X31.XXXD | Exposure to excessive natural cold, subsequent encounter | ✓ |
| X31.XXXD | Exposure to excessive natural cold, subsequent encounter | ✓ |
| X31.XXXS | Exposure to excessive natural cold, sequela | ✓ |
| X31.XXXS | Exposure to excessive natural cold, sequela | ✓ |
Frequently asked questions
What is ICD-10-CM code X31?
X31 is an ICD-10-CM category covering Exposure to excessive natural cold. It contains 6 more specific diagnosis codes, 6 of which are billable.
Is X31 a billable code?
No — X31 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example X31.XXXA — Exposure to excessive natural cold, initial encounter). 6 of the 6 codes under X31 are billable.
What codes fall under X31?
X31 includes X31.XXXA, X31.XXXA, X31.XXXD, X31.XXXD, X31.XXXS, plus 1 more. See the full list with descriptions and billable status above.
More free billing tools: all ICD-10 categories · ICD-10 search · denial codes · Medicare fees
Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
Code the diagnosis right
Join providers across the country delivering modern virtual care with CareNiva. Free to start, ready in minutes.
100% Satisfaction Guaranteed — try it risk-free