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ICD-10-CM 2027 diagnosis code

S56.321Laceration of extensor or abductor muscles, fascia and tendons of right thumb at forearm level

Not billable — use a more specific codeRequires 7th character

S56.321 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it and add the required 7th character.Short description: Lacerat extn/abdr musc/fasc/tend of right thumb at forarm lv

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About S56.321

S56.321 is the ICD-10-CM diagnosis code for laceration of extensor or abductor muscles, fascia and tendons of right thumb at forearm level. It belongs to category S56 (injury of muscle, fascia and tendon at forearm level), block S50-S59 (injuries to the elbow and forearm) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within S56.32 (laceration of extensor or abductor muscles, fascia and tendons of thumb at forearm level), S56.321 is specifically for laceration of extensor or abductor muscles, fascia and tendons of right thumb at forearm level. Related codes cover left thumb at forearm level (S56.322) and unspecified thumb at forearm level (S56.329).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

7th character

The appropriate 7th character is to be added to each code from category S56

Notes that apply from higher levels

Instructions written at a parent level also apply to S56.321.

› From S56 Injury of muscle, fascia and tendon at forearm level
Excludes2
  • injury of muscle, fascia and tendon at or below wrist (S66.-)
  • sprain of joints and ligaments of elbow (S53.4-)
Code also
  • any associated open wound (S51.-)

Broader instructions also apply from S50-S59 Injuries to the elbow and forearm and Chapter 19: Injury, poisoning and certain other consequences of external causes.

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
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about S56.321

Is S56.321 billable?

No. S56.321 is a header code. Report one of its more specific subcodes instead.