Skip to content
Dx

ICD-10-CM 2027 diagnosis code

S63.121Subluxation of interphalangeal joint of right thumb

Not billable — use a more specific codeRequires 7th character

S63.121 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.

Code last changed in FY2018 (effective October 1, 2017). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About S63.121

S63.121 is the ICD-10-CM diagnosis code for subluxation of interphalangeal joint of right thumb. It belongs to category S63 (dislocation and sprain of joints and ligaments at wrist and hand level), block S60-S69 (injuries to the wrist, hand and fingers) 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 S63.12 (subluxation and dislocation of interphalangeal joint of thumb), S63.121 is specifically for subluxation of interphalangeal joint of right thumb. Related codes cover subluxation of interphalangeal joint of left thumb (S63.122), subluxation of interphalangeal joint of unspecified thumb (S63.123), dislocation of interphalangeal joint of right thumb (S63.124), dislocation of interphalangeal joint of left thumb (S63.125) and dislocation of interphalangeal joint of unspecified thumb (S63.126).

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 changed in FY2018 (title revised).

7th character

The appropriate 7th character is to be added to each code from category S63

Notes that apply from higher levels

Instructions written at a parent level also apply to S63.121.

› From S63 Dislocation and sprain of joints and ligaments at wrist and hand level
Includes
  • avulsion of joint or ligament at wrist and hand level
  • laceration of cartilage, joint or ligament at wrist and hand level
  • sprain of cartilage, joint or ligament at wrist and hand level
  • traumatic hemarthrosis of joint or ligament at wrist and hand level
  • traumatic rupture of joint or ligament at wrist and hand level
  • traumatic subluxation of joint or ligament at wrist and hand level
  • traumatic tear of joint or ligament at wrist and hand level
Excludes2
  • strain of muscle, fascia and tendon of wrist and hand (S66.-)
Code also
  • any associated open wound

Broader instructions also apply from S60-S69 Injuries to the wrist, hand and fingers 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)
  • FY2018 (effective 10/1/2017): Title revised — was “Subluxation of unspecified interphalangeal joint of right thumb”

Common questions about S63.121

Is S63.121 billable?

No. S63.121 is a header code. Report one of its more specific subcodes instead.