V93.29XD vs X30
V93.29XD (Heat exposure on board unspecified watercraft, subsequent encounter) compared with X30 (Exposure to excessive natural heat), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. V93.29XD carries an Excludes1 note covering X30: “exposure to natural heat while on board watercraft (X30)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| V93.29XDHeat exposure on board unspecified watercraft, subsequent encounter | X30Exposure to excessive natural heat | |
|---|---|---|
| Billing status | Billable | Non-billable header |
| Classification | V00-Y99 — External Causes of Morbidity (V00-Y99) | V00-Y99 — External Causes of Morbidity (V00-Y99) |
| Definition | Heat exposure on board unspecified watercraft, subsequent encounter is a billable ICD-10-CM diagnosis code (V93.29D). | Exposure to excessive natural heat is a non-billable ICD-10-CM category code (X30). |
| 7th character | The appropriate 7th character is to be added to each code from category V93 | The appropriate 7th character is to be added to code X30 |
| Includes | Heat exposure on board boat NOS Heat exposure on board ship NOS Heat exposure on board watercraft NOS | Exposure to excessive heat as the cause of sunstroke Exposure to heat NOS |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources