ICD-10-CM 2027
ICD-10 code for thoracic region spondylolysis
From the official ICD-10-CM alphabetic index entry “Spondylolysis (acquired) › thoracic region”. Page updated September 29, 2026.
About coding thoracic region spondylolysis
The ICD-10-CM code for thoracic region spondylolysis is M43.04 (Spondylolysis, thoracic region).
Within M43.0 (Spondylolysis), M43.04 is specifically for Spondylolysis, thoracic region. Related codes cover site unspecified (M43.00), occipito-atlanto-axial region (M43.01), cervical region (M43.02), cervicothoracic region (M43.03), thoracolumbar region (M43.05), lumbar region (M43.06), lumbosacral region (M43.07), sacral and sacrococcygeal region (M43.08) and 1 more.
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.
Common questions about thoracic region spondylolysis ICD-10 codes
What is the ICD-10 code for thoracic region spondylolysis?
- M43.04 — Spondylolysis, thoracic region.
Is M43.04 billable?
- Yes. M43.04 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M43.04 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M43.04 as a principal diagnosis.
Is M43.04 a CC or MCC?
- No. M43.04 is neither a CC nor an MCC under MS-DRG v44.0.