2026 ICD-10-CM Diagnosis Code S11.85XAOpen bite of other specified part of neck, initial encounter

ICD-10-CM Codes›S00–T88›S10-S19›S11

ICD-10-CM S11.85XA
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S11.85XA is a billable ICD-10-CM diagnosis code for open bite of other specified part of neck, initial encounter. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 11 through 13, 604 through 605, 963 through 965. Coders also document this condition as animal bite of throat. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Open wounds of head and neck, initial encounter.

Code Identity

ICD-10-CM Code
S11.85XA
Billable Status
Yes — Valid for Submission
Code Describes
Open bite of other specified part of neck, initial encounter
Short Description
Open bite of other specified part of neck, initial encounter
Same as the full description in the CMS dataset.
Parent Code
S11.85
Open bite of other specified part of neck

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS10-S19Injuries to the neck
CategoryS11Open wound of neck
This CodeS11.85XAOpen bite of other specified part of neck, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Animal bite of throat
  • Dog bite of neck
  • Dog bite of throat
  • Human bite of neck
  • Human bite of throat

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Open wound of neck (S11). 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 INJ011
Open wounds of head and neck, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Animal Bites

Wild animals usually avoid people. They might attack, however, if they feel threatened, are sick, or are protecting their young or territory. Attacks by pets are more common. Animal bites rarely are life-threatening, but if they become infected, you can develop serious medical problems.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert S11.85XA to ICD-9-CMHistory

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

ICD-9-CM
874.8 Open wound of neck NEC
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 S11.85XAOverview

What is the ICD-10 code for open bite of other specified part of neck, initial encounter?

The ICD-10-CM code for open bite of other specified part of neck, initial encounter is S11.85XA (sometimes written as S1185XA). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is S11.85XA (Open bite of other specified part of neck) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report open bite of other specified part of neck, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in S11.85XA mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for open bite of other specified part of neck, such as an emergency visit or first evaluation.

What MS-DRG does S11.85XA group to?

When open bite of other specified part of neck, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 11, 12, 13, 604, 605, 963, 964, 965, with relative weights from 0.9160 to 5.4541 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of S11.85XA?

Under the General Equivalence Mappings, open bite of other specified part of neck, initial encounter converts to ICD-9-CM 874.8 (open wound of neck NEC). The mapping is approximate, so confirm the match fits the documentation.