Spider Bite ICD-10-CM Codes

Understand the crucial ICD-10 codes for diagnosing and documenting spider bites, ensuring precise clinical reporting and billing practices.

By Chloe Smith on Aug 8, 2025.

Fact Checked by Gale Alagos.

Use Code

What ICD-10 codes are used for spider bites?

The International Classification of Diseases, Tenth Revision (ICD-10), is a systematic coding system used by healthcare professionals worldwide to classify and code all diagnoses, symptoms, and procedures. It includes specific codes for spider bites among its many conditions. Here are six commonly used codes related to spider bites:

T63.301A: Toxic effect of unspecified spider venom, accidental (unintentional), initial encounter
T63.304S: Toxic effect of unspecified spider venom, undetermined, sequela
T63.311A: Toxic effect of venom of black widow spider, accidental (unintentional), initial encounter
T63.331A: Toxic effect of venom of brown recluse spider, accidental (unintentional), initial encounter
W57XXXA: Bitten or stung by nonvenomous insect and other nonvenomous arthropods, initial encounter
W57XXXD: Bitten or stung by nonvenomous insect and other nonvenomous arthropods, subsequent encounter
W57XXXS: Bitten or stung by nonvenomous insect and other nonvenomous arthropods, sequela

We recommend watching this explainer video to understand these spider bite ICD codes better. It provides a deeper dive into each code and its application in clinical settings.

Which spider bite ICD codes are billable?

Yes, all the above ICD-10 codes for spider bites are billable.

Clinical information

Spider bites display a spectrum of symptoms, largely contingent on the type of spider involved. Below is a more comprehensive outline of the clinical information related to spider bites:

Species-specific symptoms: The manifestation of symptoms from spider bites can greatly differ based on the spider species. The range is extensive, from innocuous bites that may go unnoticed to those causing significant discomfort.

Mild symptoms: The majority of spider bites lead to mild symptoms. These typically include itching, localized redness, and swelling around the bite area. Such symptoms are usually transient and resolve without requiring medical treatment.

Severe symptoms: Certain spiders, notably venomous ones like the brown recluse or black widow, can inflict bites leading to severe symptoms. These can encompass abdominal pain, fever, muscle pain, and in some instances, systemic effects.

Systemic effects: Systemic effects refer to symptoms that impact the body as a whole, not just localized to the bite site. These can include symptoms like chills, excessive sweating, nausea, headaches, and an accelerated heart rate. In rare cases, the venom from specific spiders can induce significant systemic effects.

Delayed-onset symptoms: It's essential to note that symptoms may not appear immediately after the bite in some individuals. They may surface hours or even days later, making it challenging to correlate the symptoms with a spider bite, which can potentially complicate diagnosis and treatment.

This detailed clinical information assists in effectively managing spider bites and ensuring appropriate medical care.

Synonyms include

Arachnid bite
Spider envenomation
Spider sting
Toxic effect of spider venom
Insect (superficial) bite
Nonvenomous insect bite (left ankle, right ankle, unspecified ankle, left foot, right foot, multiple sites, etc.)

Commonly asked questions

Use a spider bite ICD code when a patient presents with spider bite symptoms, such as swelling, redness, itching, or more severe symptoms like abdominal pain or fever.

Treatment usually involves managing symptoms, removing the spider venom if possible, and, in severe cases, administering antivenom.

A diagnosis code for a spider bite enables healthcare providers to accurately document the condition for administrative, epidemiological, and clinical purposes. It aids in tracking the incidence and prevalence of different types of spider bites and their respective treatments.

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