2026 ICD-10-CM Diagnosis Code S90.861SInsect bite (nonvenomous), right foot, sequela
S90.861S is a billable ICD-10-CM diagnosis code for insect bite (nonvenomous), right foot, sequela. The 7th character S marks it as a sequela code, which reports a problem that remains after the original condition has resolved. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 604 through 605. The code is exempt from POA reporting. Coders also document this condition as infected wound of right foot due to nonvenomous insect bite. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury, sequela.
Code Identity
Code Classification
Present on Admission (POA)Billing
S90.861S is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Injuries to the ankle and foot (S90-S99).
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Infected wound of right foot due to nonvenomous insect bite
- Nonvenomous insect bite of foot with infection
- Wound of right foot due to nonvenomous insect bite
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Superficial injury of ankle, foot and toes (S90). Use the following options for the applicable episode of care:
- A - initial encounter
- D - subsequent encounter
- S - sequela
Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Insect Bites and Stings
Most insect bites are harmless, though they sometimes cause discomfort. Bee, wasp, and hornet stings and fire ant bites usually hurt. Mosquito and flea bites usually itch. Insects can also spread diseases. In the United States, some mosquitoes spread West Nile virus.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert S90.861S to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S90.861SOverview
What is the ICD-10 code for insect bite (nonvenomous), right foot, sequela?
The ICD-10-CM code for insect bite (nonvenomous), right foot, sequela is S90.861S (sometimes written as S90861S). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is S90.861S (Insect bite (nonvenomous), right foot) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report insect bite (nonvenomous), right foot, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character S in S90.861S mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the insect bite (nonvenomous), right foot itself has resolved, not the original event.
What MS-DRG does S90.861S group to?
When insect bite (nonvenomous), right foot, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 604, 605, with relative weights from 0.9160 to 1.4721 depending on complications. Higher weights mean higher Medicare reimbursement.
Is S90.861S exempt from POA reporting?
Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for insect bite (nonvenomous), right foot, sequela on inpatient claims. The code appears in the Injuries to the ankle and foot (S90-S99) range of the CMS exempt list.
