2026 ICD-10-CM Diagnosis Code S01.459DOpen bite of unspecified cheek and temporomandibular area, subsequent encounter

ICD-10-CM Codes›S00–T88›S00-S09›S01

ICD-10-CM S01.459D
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S01.459D is a billable ICD-10-CM diagnosis code for open bite of unspecified cheek and temporomandibular area, subsequent encounter. The 7th character D marks it as a subsequent encounter code, used during routine care in the healing or recovery phase. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 949 through 950. The code is exempt from POA reporting. Coders also document this condition as animal bite of cheek. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Any dental condition including traumatic injury; and Open wounds of head and neck, subsequent encounter.

Code Identity

ICD-10-CM Code
S01.459D
Billable Status
Yes — Valid for Submission
Code Describes
Open bite of unspecified cheek and temporomandibular area, subsequent encounter
Short Description
Open bite of unsp cheek and temporomandibular area, subs
Parent Code
S01.459
Open bite of unspecified cheek and temporomandibular area

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS00-S09Injuries to the head
CategoryS01Open wound of head
This CodeS01.459DOpen bite of unspecified cheek and temporomandibular area, subsequent encounter

Present on Admission (POA)Billing

S01.459D 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
  • Dog bite of cheek
  • Dog bite of face
  • Human bite of cheek
  • Human bite of face

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 INJ048
Open wounds of head and neck, subsequent 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 S01.459D to ICD-9-CMHistory

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

ICD-9-CM
V58.89 Other specfied aftercare
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 S01.459DOverview

Is S01.459D (Open bite of unspecified cheek and temporomandibular area) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report open bite of unspecified cheek and temporomandibular area, subsequent encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character D in S01.459D mean?

The final character D marks a subsequent encounter: use it for routine care while the open bite of unspecified cheek and temporomandibular area is healing, after active treatment has ended.

What MS-DRG does S01.459D group to?

When open bite of unspecified cheek and temporomandibular area, subsequent encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 949, 950, with relative weights from 0.6277 to 1.1897 depending on complications. Higher weights mean higher Medicare reimbursement.

Is S01.459D 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 open bite of unspecified cheek and temporomandibular area, subsequent encounter on inpatient claims.

What is the ICD-9 equivalent of S01.459D?

Under the General Equivalence Mappings, open bite of unspecified cheek and temporomandibular area, subsequent encounter converts to ICD-9-CM V58.89 (other specfied aftercare). 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.