Coding and coverage · ICD-10-CM

S12 › S12.1 › S12.11

S12.110 Anterior displaced Type II dens fracture

Not billable (header)Chapter 19

This code needs a 7th character (use X as a placeholder for missing characters).

Check coverage with this diagnosis

7th character codes

  • S12.110A Anterior displaced Type II dens fracture, initial encounter for closed fracture
  • S12.110B Anterior displaced Type II dens fracture, initial encounter for open fracture
  • S12.110D Anterior displaced Type II dens fracture, subsequent encounter for fracture with routine healing
  • S12.110G Anterior displaced Type II dens fracture, subsequent encounter for fracture with delayed healing
  • S12.110K Anterior displaced Type II dens fracture, subsequent encounter for fracture with nonunion
  • S12.110S Anterior displaced Type II dens fracture, sequela

Instructional notes

Chapter 19

Excludes2Not included here: the patient may have both; report both when both are present.
Use additional codeAdd a second code for the full picture.
  • code to identify any retained foreign body, if applicable (Z18.-)
Notes
  • Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
  • The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

Section S10-S19

Excludes2Not included here: the patient may have both; report both when both are present.
  • burns and corrosions (T20-T32)
  • effects of foreign body in esophagus (T18.1)
  • effects of foreign body in larynx (T17.3)
  • effects of foreign body in pharynx (T17.2)
  • effects of foreign body in trachea (T17.4)
  • frostbite (T33-T34)
  • insect bite or sting, venomous (T63.4)
Includes
  • injuries of nape
  • injuries of supraclavicular region
  • injuries of throat

S12

Code firstSequence the underlying condition first.
  • any associated cervical spinal cord injury (S14.0, S14.1-)
Includes
  • fracture of cervical neural arch
  • fracture of cervical spine
  • fracture of cervical spinous process
  • fracture of cervical transverse process
  • fracture of cervical vertebral arch
  • fracture of neck
Notes
  • A fracture not indicated as displaced or nondisplaced should be coded to displaced
  • A fracture not indicated as open or closed should be coded to closed
7th charactersThe appropriate 7th character is to be added to all codes from subcategories S12.0-S12.6
  • A initial encounter for closed fracture
  • B initial encounter for open fracture
  • D subsequent encounter for fracture with routine healing
  • G subsequent encounter for fracture with delayed healing
  • K subsequent encounter for fracture with nonunion
  • S sequela

S12.1

Inclusion terms
  • Axis

Chapter 19: Injury, poisoning and certain other consequences of external causes · S10-S19 Injuries to the neck (S10-S19)

Source: ICD-10-CM FY 2027 code descriptions and tabular list (CMS and CDC National Center for Health Statistics), effective 2026-10-01 through 2027-09-30 · CMS ICD-10 files. HCC mapping: CMS-HCC V28, payment year 2027. As of 2026-11-04.

Coverage and payment depend on the claim details; confirm with the Medicare Administrative Contractor.