2027 ICD-10-CM Diagnosis Code S02.40CKMaxillary fracture, right side, subsequent encounter for fracture with nonunion

ICD-10-CM Codes›S00–T88›S00-S09›S02

ICD-10-CM S02.40CK
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

S02.40CK is a billable ICD-10-CM diagnosis code for maxillary fracture, right side, subsequent encounter for fracture with nonunion. The 7th character K means subsequent encounter for fracture with nonunion. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 564 through 566. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 5,561 closely related codes. The code is exempt from POA reporting. Coders also document this condition as closed fracture of right maxilla. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Any dental condition including traumatic injury; and Fracture of head and neck, subsequent encounter.

Code Identity

ICD-10-CM Code
S02.40CK
Billable Status
Yes — Valid for Submission
Code Describes
Maxillary fracture, right side, subsequent encounter for fracture with nonunion
Short Description
Maxillary fracture, right side, 7thK
Parent Code
S02.40C
Maxillary fracture, right 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 CodeS02.40CKMaxillary fracture, right side, subsequent encounter for fracture with nonunion

Present on Admission (POA)Billing

S02.40CK is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Injuries to the head (S00-S09).

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Closed fracture of right maxilla
  • Fracture of upper jaw, closed
  • Open fracture of maxilla
  • Open fracture of right maxilla

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 2027, published by CMS and the National Center for Health Statistics.

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to S02.40CK: its own notes plus those printed at S02, block S00-S09, and Chapter 19. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Block S00-S09 Injuries to the head applies to 1,934 codes
  • injuries of ear
  • injuries of eye
  • injuries of face [any part]
  • injuries of gum
  • injuries of jaw
  • injuries of oral cavity
  • injuries of palate
  • injuries of periocular area
  • injuries of scalp
  • injuries of temporomandibular joint area
  • injuries of tongue
  • injuries of tooth

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Block S00-S09 Injuries to the head applies to 1,934 codes
  • burns and corrosions (T20-T32)
  • effects of foreign body in ear (T16)
  • effects of foreign body in larynx (T17.3)
  • effects of foreign body in mouth NOS (T18.0)
  • effects of foreign body in nose (T17.0-T17.1)
  • effects of foreign body in pharynx (T17.2)
  • effects of foreign body on external eye (T15.-)
  • frostbite (T33-T34)
  • insect bite or sting, venomous (T63.4)
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • code to identify any retained foreign body, if applicable (Z18.-)

Code Also

A second code may be needed to fully describe the condition; the note gives no sequencing direction.

From S02 Fracture of skull and facial bones applies to 456 codes
  • any associated intracranial injury (S06.-)
From Block S00-S09 Injuries to the head applies to 1,934 codes
  • for any associated infection

Notes

General instructions on how these codes are used.

From S02 Fracture of skull and facial bones applies to 456 codes
  • A fracture not indicated as open or closed should be coded to closed
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
  • The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

7th Character

Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.

From S02 Fracture of skull and facial bones applies to 456 codes
  • The appropriate 7th character is to be added to each code from category S02
Values for category S02 Skull, Spine and Pelvis Fracture Encounter
  • Ainitial encounter for closed fracture
  • Binitial encounter for open fracture
  • Dsubsequent encounter for fracture with routine healing
  • Gsubsequent encounter for fracture with delayed healing
  • Ksubsequent encounter for fracture with nonunion this code
  • Ssequela

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name S02.40CK, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming S02.40CK: they are not reported together with it, unless the two conditions are unrelated.

  • S01 Open wound of head
    open skull fracture (S02.- with 7th character B) names S02.-, which includes this code

Code First 1

These codes say to code first a condition named in the note, and S02.40CK is one of the conditions named.

  • R40.2 Coma
    fracture of skull (S02.-) names S02.-, which includes this code

Use Additional Code 1

These codes say to use an additional code from the note, and S02.40CK is one of the codes named.

  • S07 Crushing injury of head
    skull fractures (S02.-) names S02.-, which includes this code

Code Also 2

These codes say S02.40CK may also be needed to fully describe the condition. The note gives no sequencing direction.

  • S04 Injury of cranial nerve
    skull fracture (S02.-) names S02.-, which includes this code
  • S06 Intracranial injury
    skull fracture (S02.-) names S02.-, which includes this code

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 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 S02.40CK 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 S02.40CK replaces the following previously assigned code(s):

  • S02.401K - Maxillary fracture, unsp, subs for fx w nonunion
  • S02.401K - Maxillary fracture, unspecified side, 7thK
FY 2019AddedAdded to the ICD-10-CM code setEffective October 1, 2018.
FY 2020–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About S02.40CKOverview

Is S02.40CK (Maxillary fracture, right side) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report maxillary fracture, right side, subsequent encounter for fracture with nonunion on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What does the 7th character K in S02.40CK mean?

The final character K reports a subsequent encounter where the maxillary fracture, right side has failed to heal, called a nonunion. In this category the CMS Tabular List defines K as "subsequent encounter for fracture with nonunion".

What MS-DRG does S02.40CK group to?

When maxillary fracture, right side, subsequent encounter for fracture with nonunion is the principal diagnosis on an inpatient stay, it groups to MS-DRG 564, 566, 565, with relative weights from 0.7374 to 1.4909 depending on complications. Higher weights mean higher Medicare reimbursement.

Is S02.40CK a CC or MCC?

CMS lists S02.40CK as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 5,561 closely related codes in its exclusion list.

Is S02.40CK 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 maxillary fracture, right side, subsequent encounter for fracture with nonunion on inpatient claims. The code appears in the Injuries to the head (S00-S09) range of the CMS exempt list.