ICD-10-CM 2027
ICD-10 code for lumbosacral acquired fusion
From the official ICD-10-CM alphabetic index entry “Fusion, fused (congenital) › lumbosacral (acquired)”. Page updated September 29, 2026.
About coding lumbosacral acquired fusion
The ICD-10-CM code for lumbosacral acquired fusion is M43.27 (Fusion of spine, lumbosacral region). The official index lists 3 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on M43.27.
Within M43.2 (fusion of spine), M43.27 is specifically for fusion of spine, lumbosacral region. Related codes cover site unspecified (M43.20), occipito-atlanto-axial region (M43.21), cervical region (M43.22), cervicothoracic region (M43.23), thoracic region (M43.24), thoracolumbar region (M43.25), lumbar region (M43.26) and sacral and sacrococcygeal region (M43.28).
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.
More specific lumbosacral acquired fusion codes (official index)
Common questions about lumbosacral acquired fusion ICD-10 codes
What is the ICD-10 code for lumbosacral acquired fusion?
- M43.27 — Fusion of spine, lumbosacral region. More specific codes apply when the documentation supports them: Z98.1, Q76.49, Z98.1.
What is the ICD-10 code for arthrodesis status lumbosacral acquired fusion?
- Z98.1 — Arthrodesis status.
What is the ICD-10 code for congenital lumbosacral acquired fusion?
- Q76.49 — Other congenital malformations of spine, not associated with scoliosis.
What is the ICD-10 code for postprocedural status lumbosacral acquired fusion?
- Z98.1 — Arthrodesis status.
Is M43.27 billable?
- Yes. M43.27 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M43.27 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M43.27 as a principal diagnosis.
Is M43.27 a CC or MCC?
- No. M43.27 is neither a CC nor an MCC under MS-DRG v44.0.