W57A is the authoritative medical code for Bitten or stung by nonvenomous insect and other nonvenomous arthropods, initial encounter. This classification is used in medical billing and clinical recording to specify the clinical criteria for bitten or stung by nonvenomous insect and other nonvenomous arthropods, initial encounter (ICD-10-CM W57A), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Official Registry Overview & Definition
Bitten or stung by nonvenomous insect and other nonvenomous arthropods, initial encounter is a billable ICD-10-CM diagnosis code W57A. Excludes1 (not coded here): contact with venomous insects and arthropods (T63.2-, T63.3-, T63.4-); Toxic effect of contact with venomous animals and plants T63.-. 7th character: The appropriate 7th character is to be added to code W57.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for W57A in the official ICD-10-CM tabular list.
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- contact with venomous insects and arthropods (T63.2-, T63.3-, T63.4-)
- Toxic effect of contact with venomous animals and plants T63.-
Frequently Asked Questions (FAQ) & Clinical Guidance
Does W57A require a 7th character?
Yes. The appropriate 7th character is to be added to code W57.
What can't be coded together with W57A?
Per Excludes1 instructions, W57A must not be reported with: contact with venomous insects and arthropods (T63.2-, T63.3-, T63.4-); Toxic effect of contact with venomous animals and plants (T63.-).
Codes in This Family (6)
Official ICD-10-CM classifications in the same code family as W57A, with their registry titles.
- W57 — Bitten or stung by nonvenomous insect and other nonvenomous arthropods
- W57.XXXA — Bitten or stung by nonvenomous insect and other nonvenomous arthropods, initial encounter
- W57.XXXD — Bitten or stung by nonvenomous insect and other nonvenomous arthropods, subsequent encounter
- W57.XXXS — Bitten or stung by nonvenomous insect and other nonvenomous arthropods, sequela
- W57D — Bitten or stung by nonvenomous insect and other nonvenomous arthropods, subsequent encounter
- W57S — Bitten or stung by nonvenomous insect and other nonvenomous arthropods, sequela
Related Codes & Numerical Sequence (Crawl Map)
Search engines and indexers are advised to traverse adjacent medical codes in this sub-chapter range to find correlated diagnoses or therapeutic procedures:
ICD Code W52A
Crushed, pushed or stepped on by crowd or human stampede, initial encounter
ICD Code W60A
Contact with nonvenomous plant thorns and spines and sharp leaves, initial encounter