F40.228
BillableOther natural environment type phobia
HCC Category Mapping
RxHCCHCC 133 — Personality Disorders, Anxiety, and Other Specified Mental Disorders
0.000What This Code Means
An intense, irrational fear of natural environmental phenomena other than thunderstorms, such as heights, water, or darkness.
Coding Tips
- •Use this code for natural environment phobias not specifically coded elsewhere
- •Specify the environmental trigger in documentation (heights, water, wind, etc.)
Clinical Significance
Other natural environment type phobia covers specific phobias related to natural environment stimuli other than thunderstorms (which has its own code), such as fear of water, darkness, or natural disasters. These phobias can significantly affect quality of life depending on geographic and lifestyle factors. It is not risk-adjusting under any HCC model.
Documentation Requirements
- ✓Specific natural environment stimulus feared (water, darkness, earthquakes, etc.)
- ✓Marked fear disproportionate to actual danger
- ✓Consistent anxiety response upon exposure or anticipation
- ✓Active avoidance or endurance with intense distress
- ✓Duration of 6+ months
- ✓Functional impairment documented
Commonly Confused Codes
F40.220 (Fear of thunderstorms) — Use the specific code F40.220 for thunderstorm phobia rather than the residual categoryF40.241 (Acrophobia) — Fear of heights has its own specific code and should not be coded under F40.228F40.218 (Other animal type phobia) — Distinguish between fear of animals versus fear of natural environments
Code Hierarchy
└F40Phobic anxiety disorders└F40.2Specific (isolated) phobias└F40.22Natural environment type phobia└F40.228Other natural environment type phobia
└F40.228Other natural environment type phobia