---
title: "ICD-10-CM F40.228: Other natural environment type phobia | BillingBrief"
description: "F40.228 is for a natural environment type phobia other than a fear of thunderstorms, which is coded to F40.220."
canonical: "https://billingbrief.com/icd10/f40.228/"
language: "en"
---

# F40.228 Other natural environment type phobia

ICD-10-CM · [CMS code reference](#source)

F40.228 is for a natural environment type phobia other than a fear of thunderstorms, which is coded to F40.220.

## Coding notes

From the ICD-10-CM FY2027 (effective October 1, 2026) tabular list. Notes on a parent code or category apply here too.

### Excludes2

Not part of this code, but both can be coded when both are documented.

-   dysmorphophobia (nondelusional) (F45.22)
-   nosophobia (F45.22)

## Related codes

-   [`F40.210` Arachnophobia ICD-10-CM](https://billingbrief.com/icd10/f40.210/)
-   [`F40.218` Other animal type phobia ICD-10-CM](https://billingbrief.com/icd10/f40.218/)
-   [`F40.220` Fear of thunderstorms ICD-10-CM](https://billingbrief.com/icd10/f40.220/)
-   [`F40.230` Fear of blood ICD-10-CM](https://billingbrief.com/icd10/f40.230/)
-   [`F40.231` Fear of injections and transfusions ICD-10-CM](https://billingbrief.com/icd10/f40.231/)
-   [`F40.232` Fear of other medical care ICD-10-CM](https://billingbrief.com/icd10/f40.232/)
-   [`F40.233` Fear of injury ICD-10-CM](https://billingbrief.com/icd10/f40.233/)
-   [`F40.240` Claustrophobia ICD-10-CM](https://billingbrief.com/icd10/f40.240/)

## Common questions

### Is F40.228 a billable code?

Yes. F40.228 is a billable ICD-10-CM code in the ICD-10-CM FY2027 (effective October 1, 2026) code set.

## From the source

Official description from [CMS](https://www.cms.gov/medicare/coding-billing/icd-10-codes).
ICD-10-CM FY2027 (effective October 1, 2026).

Code set

ICD-10-CM

Category

F40 Phobic anxiety disorders

Chapter

Mental, behavioral and neurodevelopmental disorders

Billable

Yes

Educational reference only. Not medical, legal, or billing advice. Always check the current official code set and payer policy before you bill. [About BillingBrief and our sources](https://billingbrief.com/about/).