ICD-10-CM 2027 diagnosis code
S12.331SUnspecified traumatic nondisplaced spondylolisthesis of fourth cervical vertebra, sequela
S12.331S is a valid, billable ICD-10-CM code for unspecified traumatic nondisplaced spondylolisthesis of fourth cervical vertebra, sequela. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Unsp traum nondisp spondylolysis of 4th cervcal vert, sqla
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 S12.331S
S12.331S is the ICD-10-CM diagnosis code for unspecified traumatic nondisplaced spondylolisthesis of fourth cervical vertebra, sequela. It belongs to category S12 (fracture of cervical vertebra and other parts of neck), block S10-S19 (injuries to the neck) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
The 7th character "S" means sequela: use it for complications or conditions that arise as a direct result of the original condition.
Code first: any associated cervical spinal cord injury (S14.0, S14.1-).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 551 (Medical Back Problems with MCC, relative weight 1.6358) and DRG 552 (Medical Back Problems without MCC, relative weight 0.9584), in MDC 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
It is exempt from present-on-admission (POA) reporting, so no POA indicator is required.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 905.1 (late effect of fracture of spine and trunk without mention of spinal cord lesion).
7th character
Ssequela
CC/MCC status for this injury by encounter: CC for A, K; MCC for B; Neither CC nor MCC for D, G, S.
Other encounter types for S12.331:
Notes that apply from higher levels
Instructions written at a parent level also apply to S12.331S.
› From S12 Fracture of cervical vertebra and other parts of neck
- 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
- 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
Broader instructions also apply from S10-S19 Injuries to the neck and Chapter 19: Injury, poisoning and certain other consequences of external causes.
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 08 · Diseases and Disorders of the Musculoskeletal System and Connective Tissue
ICD-9-CM equivalent
Converter →- 905.1Late effect of fracture of spine and trunk without mention of spinal cord lesionapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about S12.331S
Is S12.331S billable?
- Yes. S12.331S is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
What does the "S" at the end of S12.331S mean?
- It is the 7th character for sequela. Per the official guidelines, use it for complications or conditions that arise as a direct result of the original condition.
Can S12.331S be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict S12.331S as a principal diagnosis.
Is S12.331S a CC or MCC?
- No. S12.331S is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does S12.331S group to?
- S12.331S is used in the MS-DRG v44.0 logic for MS-DRG 551 (Medical Back Problems with MCC) and MS-DRG 552 (Medical Back Problems without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for S12.331S?
- The CMS General Equivalence Mappings map S12.331S to ICD-9-CM 905.1.