S12.100 – Unspecified displaced fracture of second cervical vertebra

ICD-10-CM 2027 diagnosis code · Injuries to the neck

Non-billable header

ICD-10-CM code S12.100

Code: S12.100 (claims format: S12100)
Description: Unspecified displaced fracture of second cervical vertebra
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 19. Injury, poisoning and certain other consequences of external causes (S00-T88)
Block: S10-S19 Injuries to the neck
Parent codes: S12 › S12.1 › S12.10

Billable codes under S12.100

S12.100 is a header code and cannot be used on claims. Choose the most specific code:

7th character values

Codes in this category need a 7th character to describe the encounter or episode of care.

Character	Meaning
`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

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

S12 – Fracture of cervical vertebra and other parts of neck

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

Code first:

any associated cervical spinal cord injury (S14.0, S14.1-)

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 character note:

The appropriate 7th character is to be added to all codes from subcategories S12.0-S12.6

S12.1 – Fracture of second cervical vertebra

Applicable to:

Axis

Block S10-S19

Includes:

injuries of nape
injuries of supraclavicular region
injuries of throat

Excludes2 (not included here):

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)

Index terms for S12.100

Entries in the ICD-10-CM alphabetic index that lead to this code:

Fracture, traumatic, neck, cervical vertebra, second

Related codes in S12.10

S12.101 – Unspecified nondisplaced fracture of second cervical vertebraHeader

Frequently asked questions

What is ICD-10 code S12.100?

S12.100 is the ICD-10-CM code for unspecified displaced fracture of second cervical vertebra, in the block S10-S19 (Injuries to the neck).

Is S12.100 a billable code?

No. S12.100 is a header code with more specific child codes; report one of the billable codes listed above.

What category does S12.100 belong to?

It belongs to category S12 – Fracture of cervical vertebra and other parts of neck.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.