MCMedicalCodingSoftware
S20

S20: Superficial injury of thorax

Non-billable headerICD-10-CM

S20 is a non-billable header ICD-10-CM code for superficial injury of thorax. It cannot be billed on its own: choose one of the more specific child codes below. This code also requires a 7th character before it is complete.

This code requires a 7th character

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

A
initial encounter
D
subsequent encounter
S
sequela

Other codes that can never be billed with S20

Their own Excludes1 notes name this code, so the conflict is not listed above.

  • S20.9Superficial injury of unspecified parts of thorax
  • S21.05Open bite of breast
  • S21.15Open bite of front wall of thorax without penetration into thoracic cavity
  • S21.25Open bite of back wall of thorax without penetration into thoracic cavity
  • S21.35Open bite of front wall of thorax with penetration into thoracic cavity
  • S21.45Open bite of back wall of thorax with penetration into thoracic cavity
  • S21.95Open bite of unspecified part of thorax
  • S21.95XAOpen bite of unspecified part of thorax, initial encounter

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Code history

Unchanged in every release from FY2024 to FY2027.

Code to one of these instead S20

6 child codes. Green means billable.

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.