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ICD-10/W55.21XS

W55.21XS ICD-10-CM Code: Bitten by cow, sequela

W55.21XS is the authoritative medical code for Bitten by cow, sequela. This classification is used in medical billing and clinical recording to specify the clinical criteria for bitten by cow, sequela (ICD-10-CM W55.21XS), ensuring healthcare documentation aligns with current federal coding standards.

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.

Official Registry Overview & Definition

Bitten by cow, sequela is a billable ICD-10-CM diagnosis code (W55.21S). Includes: contact with saliva, feces or urine of mammal. Excludes1 (not coded here): animal being ridden- see transport accidents; bitten or struck by dog (W54); bitten or struck by rodent (W53.-); contact with marine mammals (W56.-); Toxic effect of contact with venomous animals and plants (T63.-). 7th character: The appropriate 7th character is to be added to each code from category W55.

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for W55.21XS in the official ICD-10-CM tabular list.

Includes

Conditions the official ICD-10-CM tabular list includes under this code.

  • contact with saliva, feces or urine of mammal

Excludes1 — Not Coded Here

Conditions that can never be reported with this code; the two are mutually exclusive.

  • animal being ridden- see transport accidents
  • bitten or struck by dog (W54)
  • bitten or struck by rodent (W53.-)
  • contact with marine mammals (W56.-)
  • Toxic effect of contact with venomous animals and plants (T63.-)

Frequently Asked Questions (FAQ) & Clinical Guidance

Does W55.21XS require a 7th character?

Yes. The appropriate 7th character is to be added to each code from category W55.

What can't be coded together with W55.21XS?

Per official ICD-10-CM Excludes1 instructions, W55.21XS must not be reported together with: animal being ridden- see transport accidents; bitten or struck by dog (W54); bitten or struck by rodent (W53.-); contact with marine mammals (W56.-).

Nearest Codes in This Family

Official ICD-10-CM classifications closest to W55.21XS in its code family, with their registry titles.

  • W55.19XS — Other contact with horse, sequela
  • W55.2 — Contact with cow
  • W55.21 — Bitten by cow
  • W55.21XA — Bitten by cow, initial encounter
  • W55.21XD — Bitten by cow, subsequent encounter
  • W55.22 — Struck by cow
  • W55.22XA — Struck by cow, initial encounter
  • W55.22XD — Struck by cow, subsequent encounter
  • W55.22XS — Struck by cow, sequela
  • W55.29 — Other contact with cow

View all codes in the W55 family