M43.25 – Fusion of spine, thoracolumbar region

ICD-10-CM 2027 diagnosis code · Deforming dorsopathies

Billable code

ICD-10-CM code M43.25

Code: M43.25 (claims format: M4325)
Description: Fusion of spine, thoracolumbar region
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 13. Diseases of the musculoskeletal system and connective tissue (M00-M99)
Block: M40-M43 Deforming dorsopathies
Parent codes: M43 › M43.2

Notes inherited from parent codes

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

M43 – Other deforming dorsopathies

Excludes1 (not coded here):

congenital spondylolysis and spondylolisthesis (Q76.2)
hemivertebra (Q76.3-Q76.4)
Klippel-Feil syndrome (Q76.1)
lumbarization and sacralization (Q76.4)
platyspondylisis (Q76.4)
spina bifida occulta (Q76.0)
spinal curvature in osteoporosis (M80.-)
spinal curvature in Paget's disease of bone [osteitis deformans] (M88.-)

M43.2 – Fusion of spine

Applicable to:

Ankylosis of spinal joint

Excludes1 (not coded here):

ankylosing spondylitis (M45.0-)
congenital fusion of spine (Q76.4)

Excludes2 (not included here):

arthrodesis status (Z98.1)
pseudoarthrosis after fusion or arthrodesis (M96.0)

Index terms for M43.25

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

Fusion, fused, spine, thoracolumbar region

Related codes in M43.2

M43.20 – Fusion of spine, site unspecifiedBillable
M43.21 – Fusion of spine, occipito-atlanto-axial regionBillable
M43.22 – Fusion of spine, cervical regionBillable
M43.23 – Fusion of spine, cervicothoracic regionBillable
M43.24 – Fusion of spine, thoracic regionBillable
M43.26 – Fusion of spine, lumbar regionBillable
M43.27 – Fusion of spine, lumbosacral regionBillable
M43.28 – Fusion of spine, sacral and sacrococcygeal regionBillable

Frequently asked questions

What is ICD-10 code M43.25?

M43.25 is the ICD-10-CM code for fusion of spine, thoracolumbar region, in the block M40-M43 (Deforming dorsopathies).

Is M43.25 a billable code?

Yes. M43.25 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does M43.25 belong to?

It belongs to category M43 – Other deforming dorsopathies.

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.