Blister (nonthermal) of middle front wall of thorax, subsequent encounter

ValidICD-10-CM diagnosis code.

Valid for claims with a date of service in the current code year.

Valid FY2021 onwards.

What has happened to this code

Every change the publisher made, from 2021 to now.

FY2021 Added to the code set Blister (nonthermal) of middle front wall of thorax, subsequent encounter

Official coding rules

Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.

Inherited from S20 Superficial injury of thorax

Seventh character required

The appropriate 7th character is to be added to each code from category S20

Inherited from the S20-S29 section Injuries to the thorax (S20-S29)

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)

Includes

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

How CDC's index refers to this code

Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.

Blister > chest wall
Blister > costal region
Injury > superficial NEC > blister
Injury > superficial NEC > chest wall
Injury > superficial NEC > costal region
Injury > thorax, thoracic > external > superficial
Injury > superficial NEC > thorax, thoracic > blister
Blister > thorax, thoracic > front

Codes in the same group

Code	Description	Status
S20.324A	Blister (nonthermal) of middle front wall of thorax, initial encounter	Valid
S20.324S	Blister (nonthermal) of middle front wall of thorax, sequela	Valid