2026 ICD-10-CM Diagnosis Code S01.552AOpen bite of oral cavity, initial encounter

ICD-10-CM S01.552A

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

S01.552A is a billable ICD-10-CM diagnosis code for open bite of oral cavity, 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, 157 through 159, 963 through 965. Coders also document this condition as animal bite of mouth. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Any dental condition including traumatic injury; and Open wounds of head and neck, initial encounter.

Code Identity

ICD-10-CM Code

S01.552A

Billable Status

Yes — Valid for Submission

Code Describes

Open bite of oral cavity, initial encounter

Short Description

Open bite of oral cavity, initial encounter

Same as the full description in the CMS dataset.

Parent Code

S01.552

Open bite of oral cavity

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes

SectionS00-S09Injuries to the head

CategoryS01Open wound of head

This CodeS01.552AOpen bite of oral cavity, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

Animal bite of mouth
Bite to own tongue
Bite wound of mouth
Dog bite of mouth
Human bite of mouth
Open wound of mouth due to bite
Open wound of tongue
Open wound of tongue due to bite

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Open wound of head (S01). 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 DEN001

Any dental condition including traumatic injury

Default principal diagnosis: inpatient No · outpatient No

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.