M43.03 – Spondylolysis, cervicothoracic region

ICD-10-CM 2027 diagnosis code · Deforming dorsopathies

Billable code

ICD-10-CM code M43.03

Code: M43.03 (claims format: M4303)
Description: Spondylolysis, cervicothoracic 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 › M43.0

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.-)

M43.0 – Spondylolysis

Excludes1 (not coded here):

congenital spondylolysis (Q76.2)
spondylolisthesis (M43.1)

Index terms for M43.03

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

Spondylolysis, cervicothoracic region

Related codes in M43.0

M43.00 – Spondylolysis, site unspecifiedBillable
M43.01 – Spondylolysis, occipito-atlanto-axial regionBillable
M43.02 – Spondylolysis, cervical regionBillable
M43.04 – Spondylolysis, thoracic regionBillable
M43.05 – Spondylolysis, thoracolumbar regionBillable
M43.06 – Spondylolysis, lumbar regionBillable
M43.07 – Spondylolysis, lumbosacral regionBillable
M43.08 – Spondylolysis, sacral and sacrococcygeal regionBillable
M43.09 – Spondylolysis, multiple sites in spineBillable

Frequently asked questions

What is ICD-10 code M43.03?

M43.03 is the ICD-10-CM code for spondylolysis, cervicothoracic region, in the block M40-M43 (Deforming dorsopathies).

Is M43.03 a billable code?

Yes. M43.03 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does M43.03 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.