S21.339A – Puncture wound without foreign body of unspecified front wall of thorax with penetration into thoracic cavity, initial encounter

ICD-10-CM 2027 diagnosis code · Injuries to the thorax

Billable code

ICD-10-CM code S21.339A

Code: S21.339A (claims format: S21339A)
Description: Puncture wound without foreign body of unspecified front wall of thorax with penetration into thoracic cavity, initial encounter
Short description: Pnctr w/o fb of unsp frnt wl of thrx w penet thor cav, init
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 19. Injury, poisoning and certain other consequences of external causes (S00-T88)
Block: S20-S29 Injuries to the thorax
Parent codes: S21 › S21.3 › S21.33 › S21.339

7th character values

Codes in this category need a 7th character to describe the encounter or episode of care.

Character	Meaning
`A`	initial encounter
`D`	subsequent encounter
`S`	sequela

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

S21 – Open wound of thorax

Excludes1 (not coded here):

traumatic amputation (partial) of thorax (S28.1)

Code also:

any associated injury, such as:
injury of heart (S26.-)
injury of intrathoracic organs (S27.-)
rib fracture (S22.3-, S22.4-)
spinal cord injury (S24.0-, S24.1-)
traumatic hemopneumothorax (S27.3)
traumatic hemothorax (S27.1)
traumatic pneumothorax (S27.0)
wound infection

7th character note:

The appropriate 7th character is to be added to each code from category S21

S21.3 – Open wound of front wall of thorax with penetration into thoracic cavity

Applicable to:

Open wound of chest with penetration into thoracic cavity

Block S20-S29

Includes:

injuries of breast
injuries of chest (wall)
injuries of interscapular area

Excludes2 (not included here):

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)

Related codes in S21.339

Frequently asked questions

What is ICD-10 code S21.339A?

S21.339A is the ICD-10-CM code for puncture wound without foreign body of unspecified front wall of thorax with penetration into thoracic cavity, initial encounter, in the block S20-S29 (Injuries to the thorax).

Is S21.339A a billable code?

Yes. S21.339A is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does S21.339A belong to?

It belongs to category S21 – Open wound of thorax.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.