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ICD-10-CM 2027 diagnosis code

S13.12Subluxation and dislocation of C1/C2 cervical vertebrae

Not billable — use a more specific codeRequires 7th character

S13.12 is a header code, so it can't be reported by itself. Choose one of the 2 more specific codes beneath it and add the required 7th character.

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 S13.12

S13.12 is the ICD-10-CM diagnosis code for subluxation and dislocation of C1/C2 cervical vertebrae. It belongs to category S13 (dislocation and sprain of joints and ligaments at neck level), block S10-S19 (injuries to the neck) 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 2 subcodes must be used instead.

Within S13.1 (subluxation and dislocation of cervical vertebrae), S13.12 is specifically for subluxation and dislocation of C1/C2 cervical vertebrae. Related codes cover unspecified cervical vertebrae (S13.10), C0/C1 cervical vertebrae (S13.11), C2/C3 cervical vertebrae (S13.13), C3/C4 cervical vertebrae (S13.14), C4/C5 cervical vertebrae (S13.15), C5/C6 cervical vertebrae (S13.16), C6/C7 cervical vertebrae (S13.17) and C7/T1 cervical vertebrae (S13.18).

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 S13

  • Ainitial encounter
  • Dsubsequent encounter
  • Ssequela

Coding notes

Applicable toConditions and synonyms classified to this code
  • Subluxation and dislocation of atlantoaxial joint

Notes that apply from higher levels

Instructions written at a parent level also apply to S13.12.

› From S13.1 Subluxation and dislocation of cervical vertebrae
Excludes2
Code also
  • any associated:
  • open wound of neck (S11.-)
  • spinal cord injury (S14.1-)
› From S13 Dislocation and sprain of joints and ligaments at neck level
Includes
  • avulsion of joint or ligament at neck level
  • laceration of cartilage, joint or ligament at neck level
  • sprain of cartilage, joint or ligament at neck level
  • traumatic hemarthrosis of joint or ligament at neck level
  • traumatic rupture of joint or ligament at neck level
  • traumatic subluxation of joint or ligament at neck level
  • traumatic tear of joint or ligament at neck level
Excludes2
  • strain of muscle or tendon at neck level (S16.1)
Code also
  • any associated open wound

Broader instructions also apply from S10-S19 Injuries to the neck 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 S13.12

Is S13.12 billable?

No. S13.12 is a header code. Report one of its more specific subcodes instead.