Insect bite (nonvenomous), unspecified ankle, init encntr

This code signifies a skin lesion resulting from a non-poisonous insect bite on an unspecified ankle. The bite typically presents as a localized inflammatory reaction, such as a papule, wheal, or erythema, without evidence of systemic toxicity.

Apply this code when documenting the initial treatment for a patient presenting with an insect bite on the ankle, and the specific ankle (left or right) is not documented. This is appropriate for routine bites from common insects like mosquitoes, fleas, or gnats, where no venomous reaction is suspected.

• Ensure the documentation explicitly states "initial encounter" for the bite.
• If the specific ankle (left or right) is known, use a more specific code from the S90.56- series.
• Do not use this code if the bite is from a venomous insect (e.g., spider, scorpion, bee, wasp); instead, refer to codes in the T63 category.