2027 ICD-10-CM Diagnosis Code S29.9XXDUnspecified injury of thorax, subsequent encounter

ICD-10-CM Codes›S00–T88›S20-S29›S29

ICD-10-CM S29.9XXD
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

S29.9XXD is a billable ICD-10-CM diagnosis code for unspecified injury of thorax, 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 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 949 through 950. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other unspecified injuries, subsequent encounter.

Code Identity

ICD-10-CM Code
S29.9XXD
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified injury of thorax, subsequent encounter
Short Description
Unspecified injury of thorax, subsequent encounter
Same as the full description in the CMS dataset.
Parent Code
S29.9
Unspecified injury of thorax

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS20-S29Injuries to the thorax
CategoryS29Other and unspecified injuries of thorax
This CodeS29.9XXDUnspecified injury of thorax, subsequent encounter

Present on Admission (POA)Billing

S29.9XXD is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Injuries to the thorax (S20-S29).

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Blunt injury
  • Blunt injury of thorax
  • Breast hematoma
  • Central cord syndrome of thoracic spinal cord due to traumatic injury
  • Chest injury
  • Clavicle injury
  • Costal cartilage injury
  • Deceleration injury of thorax
  • Injury of back of chest
  • Injury of breast
  • Injury of chest wall
  • Injury of front of chest
  • Injury of interscapular region
  • Injury of left breast
  • Injury of ribs
  • Injury of right breast
  • Injury of side of chest
  • Injury of sternum
  • Injury of thoracic cavity
  • Internal injury of chest, abdomen and pelvis
  • Multiple injuries of head and chest
  • Multiple injuries of thorax
  • Traumatic hematoma of breast
  • Traumatic injury of chest wall
  • Traumatic injury of posterior chest wall

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Other and unspecified injuries of thorax (S29). 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 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 S29.9XXD: its own notes plus those printed at S29, block S20-S29, 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 S20-S29 Injuries to the thorax applies to 1,602 codes
  • injuries of breast
  • injuries of chest (wall)
  • injuries of interscapular area

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 S20-S29 Injuries to the thorax applies to 1,602 codes
  • burns and corrosions (T20-T32)
  • effects of foreign body in bronchus (T17.5)
  • effects of foreign body in esophagus (T18.1)
  • effects of foreign body in lung (T17.8)
  • effects of foreign body in trachea (T17.4)
  • frostbite (T33-T34)
  • injuries of axilla
  • injuries of clavicle
  • injuries of scapular region
  • injuries of shoulder
  • 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 S29 Other and unspecified injuries of thorax applies to 42 codes
  • any associated open wound (S21.-)

Notes

General instructions on how these codes are used.

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 S29 Other and unspecified injuries of thorax applies to 42 codes
  • The appropriate 7th character is to be added to each code from category S29
Values for category S29 Encounter: Initial, Subsequent, Sequela
  • Ainitial encounter
  • Dsubsequent encounter this code
  • Ssequela

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

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INJ064
Other unspecified injuries, subsequent encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Chest Injuries and Disorders

The chest is the part of your body between your neck and your abdomen (belly). The medical term for your chest is thorax.

The full article covers:

  • What is the chest?
  • What are chest injuries and disorders?
  • How are chest injuries and disorders diagnosed?

Read the full article at MedlinePlus

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

Convert S29.9XXD 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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About S29.9XXDOverview

What is the ICD-10 code for unspecified injury of thorax, subsequent encounter?

The ICD-10-CM code for unspecified injury of thorax, subsequent encounter is S29.9XXD (sometimes written as S299XXD). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is S29.9XXD (Unspecified injury of thorax) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report unspecified injury of thorax, subsequent encounter on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What does the 7th character D in S29.9XXD mean?

The final character D marks a subsequent encounter: use it for routine care while the unspecified injury of thorax is healing, after active treatment has ended.

What MS-DRG does S29.9XXD group to?

When unspecified injury of thorax, subsequent encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 950, 949, with relative weights from 0.7661 to 1.1231 depending on complications. Higher weights mean higher Medicare reimbursement.

Is S29.9XXD 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 unspecified injury of thorax, subsequent encounter on inpatient claims. The code appears in the Injuries to the thorax (S20-S29) range of the CMS exempt list.