2026 ICD-10-CM Diagnosis Code S00.86XSInsect bite (nonvenomous) of other part of head, sequela

ICD-10-CM Codes›S00–T88›S00-S09›S00

ICD-10-CM S00.86XS
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S00.86XS is a billable ICD-10-CM diagnosis code for insect bite (nonvenomous) of other part of head, 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
S00.86XS
Billable Status
Yes — Valid for Submission
Code Describes
Insect bite (nonvenomous) of other part of head, sequela
Short Description
Insect bite (nonvenomous) of other part of head, sequela
Same as the full description in the CMS dataset.
Parent Code
S00.86
Insect bite (nonvenomous) of other part of head

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS00-S09Injuries to the head
CategoryS00Superficial injury of head
This CodeS00.86XSInsect bite (nonvenomous) of other part of head, sequela

Present on Admission (POA)Billing

S00.86XS 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.

  • Animal bite of cheek
  • Animal bite of forehead
  • Insect bite of cheek
  • Insect bite of forehead
  • Insect bite, nonvenomous, of face
  • Nonvenomous insect bite of cheek
  • Nonvenomous insect bite of cheek with infection
  • Nonvenomous insect bite of cheek without infection
  • Nonvenomous insect bite of chin
  • Nonvenomous insect bite of chin with infection
  • Nonvenomous insect bite of face with infection
  • Nonvenomous insect bite of face without infection
  • Nonvenomous insect bite of forehead
  • Superficial injury of cheek with infection
  • Superficial injury of cheek without infection
  • Superficial injury of chin
  • Superficial injury of face without infection
  • Superficial injury of skin of forehead
  • Wound of head due to nonvenomous insect bite

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Superficial injury of head (S00). 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 S00.86XS 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 S00.86XSOverview

Is S00.86XS (Insect bite (nonvenomous) of other part of head) a billable code?

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

What does the 7th character S in S00.86XS mean?

The final character S makes this a sequela code: it reports a lingering problem that remains after the insect bite (nonvenomous) of other part of head itself has resolved, not the original event.

What MS-DRG does S00.86XS group to?

When insect bite (nonvenomous) of other part of head, 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 S00.86XS 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) of other part of head, sequela on inpatient claims.

What is the ICD-9 equivalent of S00.86XS?

Under the General Equivalence Mappings, insect bite (nonvenomous) of other part of head, 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.