2026 ICD-10-CM Diagnosis Code S90.464SInsect bite (nonvenomous), right lesser toe(s), sequela

ICD-10-CM Codes›S00–T88›S90-S99›S90

ICD-10-CM S90.464S
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S90.464S is a billable ICD-10-CM diagnosis code for insect bite (nonvenomous), right lesser toe(s), 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury, sequela.

Code Identity

ICD-10-CM Code
S90.464S
Billable Status
Yes — Valid for Submission
Code Describes
Insect bite (nonvenomous), right lesser toe(s), sequela
Short Description
Insect bite (nonvenomous), right lesser toe(s), sequela
Same as the full description in the CMS dataset.
Parent Code
S90.464
Insect bite (nonvenomous), right lesser toe(s)

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS90-S99Injuries to the ankle and foot
CategoryS90Superficial injury of ankle, foot and toes
This CodeS90.464SInsect bite (nonvenomous), right lesser toe(s), sequela

Present on Admission (POA)Billing

S90.464S is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

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
  • Nonvenomous insect bite of lesser toe
  • Nonvenomous insect bite of lesser toe of right foot
  • Nonvenomous insect bite of lesser toe of right foot with infection
  • Nonvenomous insect bite of lesser toe with infection
  • Nonvenomous insect bite of toe 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.

CCSR INJ073
Injury, sequela
Default principal diagnosis: inpatient Yes · outpatient Yes

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 S90.464S to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
906.2 Late eff superficial inj
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About S90.464SOverview

Is S90.464S (Insect bite (nonvenomous), right lesser toe(s)) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report insect bite (nonvenomous), right lesser toe(s), sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character S in S90.464S mean?

The final character S makes this a sequela code: it reports a lingering problem that remains after the insect bite (nonvenomous), right lesser toe(s) itself has resolved, not the original event.

What MS-DRG does S90.464S group to?

When insect bite (nonvenomous), right lesser toe(s), 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 S90.464S 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 lesser toe(s), sequela on inpatient claims.

What is the ICD-9 equivalent of S90.464S?

Under the General Equivalence Mappings, insect bite (nonvenomous), right lesser toe(s), sequela converts to ICD-9-CM 906.2 (late eff superficial inj). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.