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2025 ICD-10-CM code W53.09XA

Other contact with mouse, initial encounter.

This code should be used as a secondary code to a code from another chapter indicating the nature of the condition. If the contact results in an injury, a code from Chapter 19 (Injury, poisoning and certain other consequences of external causes (S00-T88)) should be used as the primary code. Other conditions that may be stated to be due to external causes can be classified in Chapters I to XVIII, using codes from Chapter 20 to provide additional information as to the cause of the condition.

The medical necessity for using this code is determined by the presence of signs, symptoms, or illnesses resulting from contact with a mouse (other than a bite).This code helps to track and analyze such incidents for public health purposes and facilitates appropriate treatment and preventive measures.

The provider should document the details of the contact, including the nature of the contact (e.g., contact with urine, feces, saliva) and any resulting injuries or illnesses.

IMPORTANT For a mouse bite, use W53.01XA.

In simple words: This code describes an initial encounter where a person has had contact with a mouse (other than a bite), such as touching its droppings, urine, or saliva.

Contact with a mouse other than being bitten, initial encounter. This includes contact with saliva, feces, or urine of the rodent.

Example 1: A child playing in a basement touches mouse droppings and later develops a fever., A homeowner cleaning out an old shed comes into contact with mouse urine and develops a rash., A restaurant worker discovers mouse feces in a storage area and accidentally touches them while cleaning.

Documentation should clearly describe the circumstances of the contact with the mouse, including the source of contact (e.g., feces, urine, saliva), the location of the contact, and any signs or symptoms resulting from the contact. If there are any related injuries or illnesses, they should also be documented.

** This code excludes the toxic effect of contact with venomous animals and plants (T63.-).

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