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ICD-10-CM 2027 diagnosis code

S20.223AContusion of bilateral back wall of thorax, initial encounter

✓ Billable / specificRequires 7th character

S20.223A is a valid, billable ICD-10-CM code for contusion of bilateral back wall of thorax, initial encounter. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Contusion of bilateral back wall of thorax, init

Code last changed in FY2021 (effective October 1, 2020). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About S20.223A

S20.223A is the ICD-10-CM diagnosis code for contusion of bilateral back wall of thorax, initial encounter. It belongs to category S20 (superficial injury of thorax), block S20-S29 (injuries to the thorax) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

The 7th character "A" means initial encounter: use it while the patient is receiving active treatment for the condition.

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 604 (Trauma to the Skin, Subcutaneous Tissue and Breast with MCC, relative weight 1.453), DRG 605 (Trauma to the Skin, Subcutaneous Tissue and Breast without MCC, relative weight 0.9079), DRG 963 (Other Multiple Significant Trauma with MCC, relative weight 2.6363), DRG 964 (Other Multiple Significant Trauma with CC, relative weight 1.4972) and DRG 965 (Other Multiple Significant Trauma without CC/MCC, relative weight 1.0059), in MDC 09 (Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast) and MDC 24 (Multiple Significant Trauma), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It was added in FY2021, effective October 1, 2020.

7th character

Ainitial encounter

Other encounter types for S20.223:

Notes that apply from higher levels

Instructions written at a parent level also apply to S20.223A.

Broader instructions also apply from S20-S29 Injuries to the thorax and Chapter 19: Injury, poisoning and certain other consequences of external causes.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2021 (effective 10/1/2020): Added
  • No changes since FY2021.

Common questions about S20.223A

Is S20.223A billable?

Yes. S20.223A is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

What does the "A" at the end of S20.223A mean?

It is the 7th character for initial encounter. Per the official guidelines, use it while the patient is receiving active treatment for the condition.

Can S20.223A be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict S20.223A as a principal diagnosis.

Is S20.223A a CC or MCC?

No. S20.223A is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does S20.223A group to?

S20.223A is used in the MS-DRG v44.0 logic for MS-DRG 604 (Trauma to the Skin, Subcutaneous Tissue and Breast with MCC), MS-DRG 605 (Trauma to the Skin, Subcutaneous Tissue and Breast without MCC), MS-DRG 963 (Other Multiple Significant Trauma with MCC), MS-DRG 964 (Other Multiple Significant Trauma with CC) and MS-DRG 965 (Other Multiple Significant Trauma without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.