S12.400G Unspecified displaced fracture of fifth cervical vertebra, subsequent encounter for fracture with delayed healing

ICD-10-CM S12.400G: Unspecified Displaced Fracture of Fifth Cervical Vertebra, Subsequent Encounter with Delayed Healing

ICD-10-CM code S12.400G is titled "Unspecified displaced fracture of fifth cervical vertebra, subsequent encounter for fracture with delayed healing." The supplied sources establish this exact descriptor within the ICD10CM system. The sources do not provide clinical context, treatment details, or coverage rules for this specific code. 3 4

Plain-language overview

The ICD10CM system includes code S12.400G, which carries the official descriptor "Unspecified displaced fracture of fifth cervical vertebra, subsequent encounter for fracture with delayed healing." 3

What this code represents

Code S12.400G represents a diagnosis or health-status concept within the ICD10CM code system, specifically denoting an unspecified displaced fracture of the fifth cervical vertebra during a subsequent encounter with delayed healing. 3 4

Coding details

The related code S12.400A is defined as an initial encounter for a closed fracture of the fifth cervical vertebra, distinguishing it from the subsequent encounter designation of S12.400G. 5

Documentation considerations

For the related code S12.400A to count as a valid HCC diagnosis, provider documentation must show MEAT criteria, meaning the provider monitored, evaluated, assessed, or treated the condition during that encounter. 5

Coverage and utilization context

The related code S12.400A maps to Vertebral Fractures without Spinal Cord Injury under the CMS-HCC V28 risk adjustment model, with a community non-dual aged base RAF weight of 0.522. 5

What the sources add

The CMS billing and coding articles list the descriptor for S12.400G alongside the related code S12.400K, while the National Library of Medicine and EVS Explore sources independently confirm the S12.400G descriptor within the ICD10CM system. 1 2 3 4

The CMS sources provide the S12.400G descriptor within cervical fusion billing and coding articles, whereas the NLM source establishes the code strictly within the ICD10CM code system browse functionality. 1 3

Questions to verify

The supplied sources do not establish whether S12.400G is a billable code, nor do they confirm if it maps to a CMS-HCC risk adjustment category like the related S12.400A code does. 3 5

Sources

1. Article - Billing and Coding: Cervical Fusion (A59608) — cms.gov; accessed 2026-07-25.
2. Article - Billing and Coding: Cervical Fusion (A59634) — cms.gov; accessed 2026-07-25.
3. Browse Code Systems — vsac.nlm.nih.gov; accessed 2026-07-25.
4. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-25.
5. 2026 ICD-10-CM S12.400A: Unspecified displaced | HCC 401 — hccbuddy.com; accessed 2026-07-25.