2026 ICD-10-CM Diagnosis Code S02.80XKFracture of other specified skull and facial bones, unspecified side, subsequent encounter for fracture with nonunion

ICD-10-CM Codes›S00–T88›S00-S09›S02

ICD-10-CM S02.80XK
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S02.80XK is a billable ICD-10-CM diagnosis code for fracture of other specified skull and facial bones, unspecified side, subsequent encounter for fracture with nonunion. The 7th character K reports a subsequent encounter for a fracture that has failed to heal, called a nonunion. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 564 through 566. The code is flagged as an unspecified code, since codes identifying laterality exist in the same family and exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Fracture of head and neck, subsequent encounter.

Code Identity

ICD-10-CM Code
S02.80XK
Billable Status
Yes — Valid for Submission
Code Describes
Fracture of other specified skull and facial bones, unspecified side, subsequent encounter for fracture with nonunion
Short Description
Fx oth skull and facial bones, unspecified side, 7thK
Parent Code
S02.80
Fracture of other specified skull and facial bones, unspecified side

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS00-S09Injuries to the head
CategoryS02Fracture of skull and facial bones
This CodeS02.80XKFracture of other specified skull and facial bones, unspecified side, subsequent encounter for fracture with nonunion

Code EditsBilling

Medicare Code Editor checks that affect claim validity for S02.80XK.

Unspecified codes
Unspecified codes exist in the ICD-10-CM classification for circumstances when documentation in the medical record does not provide the level of detail needed to support reporting a more specific code. However, in the inpatient setting, there should generally be very limited and rare circumstances for which the laterality (right, left, bilateral) of a condition is unable to be documented and reported. The following pages contain the list of unspecified ICD-10-CM diagnosis codes for which there is a more specific code to identify laterality (right, left, bilateral) within that code family.

Present on Admission (POA)Billing

S02.80XK 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.

  • Closed fracture of medial wall of orbit
  • Closed fracture of orbit
  • Closed fracture of palate
  • Disorder of lacrimal bone
  • Fracture dislocation of temporomandibular joint
  • Fracture of frontonasoethmoidal complex
  • Fracture of frontonasoethmoidal complex with increased intercanthal distance
  • Fracture of lacrimal bone
  • Fracture of lateral wall of orbit
  • Fracture of malar or maxillary bones, open
  • Fracture of medial wall of orbit
  • Fracture of midfacial bones
  • Fracture of palatal process
  • Fracture of palate, open
  • Fracture of supraorbital rim
  • Fracture of temporal bone
  • Injury of mastoid
  • Mastoid fracture
  • Open fracture of medial wall of orbit
  • Open fracture of orbit
  • Open fracture of zygomatic tripod

Coding GuidelinesGuidance

The principles of multiple coding of injuries should be followed in coding fractures. Fractures of specified sites are coded individually by site, to the level of detail furnished by medical record content.

A fracture not indicated as open or closed should be coded to closed. A fracture not indicated whether displaced or not displaced should be coded to displaced.

Initial vs. Subsequent Encounter for Fractures

Traumatic fractures are coded using the appropriate 7th character for initial encounter (A, B, C) while the patient is receiving active treatment for the fracture. The appropriate 7th character for initial encounter should also be assigned for a patient who delayed seeking treatment for the fracture or nonunion.

Fractures are coded using the appropriate 7th character for subsequent care for encounters after the patient has completed active treatment of the fracture and is receiving routine care for the fracture during the healing or recovery phase.

Care for complications of surgical treatment for fracture repairs during the healing or recovery phase should be coded with the appropriate complication codes.

Care of complications of fractures, such as malunion and nonunion, should be reported with the appropriate 7th character for subsequent care with nonunion (K, M, N) or subsequent care with malunion (P, Q, R).

The open fracture designations in the assignment of the 7th character for fractures of the forearm, femur and lower leg, including ankle are based on the Gustilo open fracture classification. When the Gustilo classification type is not specified for an open fracture, the 7th character for open fracture type I or II should be assigned (B, E, H, M, Q).

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 INJ038
Fracture of head and neck, subsequent encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Facial Injuries and Disorders

Face injuries and disorders can cause pain and affect how you look. In severe cases, they can affect sight, speech, breathing and your ability to swallow. Fractures (broken bones), especially in the bones of your nose, cheekbone and jaw, are common facial injuries.

Read the full article at MedlinePlus

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

Convert S02.80XK to ICD-9-CMHistory

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

ICD-9-CM
733.82 Nonunion of fracture
Approximate The match is approximate rather than exact.

Code History & ChangesHistory

Replacement S02.80XK replaces the following previously assigned code(s):

  • S02.8XXK - Fractures of skull and facial bones, subs for fx w nonunion
FY 2018AddedAdded to the ICD-10-CM code setEffective October 1, 2017.
FY 2019–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About S02.80XKOverview

Is S02.80XK a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report fracture of other specified skull and facial bones, unspecified side, subsequent encounter for fracture with nonunion on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character K in S02.80XK mean?

The final character K reports a subsequent encounter where the fracture of other specified skull and facial bones, unspecified side has failed to heal, called a nonunion.

What MS-DRG does S02.80XK group to?

When fracture of other specified skull and facial bones, unspecified side, subsequent encounter for fracture with nonunion is the principal diagnosis on an inpatient stay, it groups to MS-DRG 564, 565, 566, with relative weights from 0.7493 to 1.5436 depending on complications. Higher weights mean higher Medicare reimbursement.

Is S02.80XK 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 fracture of other specified skull and facial bones, unspecified side, subsequent encounter for fracture with nonunion on inpatient claims.

What is the ICD-9 equivalent of S02.80XK?

Under the General Equivalence Mappings, fracture of other specified skull and facial bones, unspecified side, subsequent encounter for fracture with nonunion converts to ICD-9-CM 733.82 (nonunion of fracture). 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.