Alphabetic Index FY2027

M43.20

Fusion of spine, site unspecified

FY2027Chapter 13: Diseases of the musculoskeletal system and connective tissue/M40–M43 Deforming dorsopathies

BillableComplete code, valid to report

M43.20 (also written M4320) is a billable ICD-10-CM diagnosis code for fusion of spine, site unspecified. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 50 codes in category M43 (Other deforming dorsopathies). The Alphabetic Index lists it under 1 entry. Its coding notes include 10 Excludes1 entries and 12 Excludes2 entries.

Excludes1

Not coded here. The listed conditions generally should not be reported together.

Inherited from M43.2 Fusion of spine
  • ankylosing spondylitis (M45.0-)
  • congenital fusion of spine (Q76.4)
Inherited from M43 Other deforming dorsopathies
  • 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.-)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Inherited from M43.2 Fusion of spine
  • arthrodesis status (Z98.1)
  • pseudoarthrosis after fusion or arthrodesis (M96.0)
Also from chapter/block level (10 notes)
Inherited from Chapter 13 Diseases of the musculoskeletal system and connective tissue
  • arthropathic psoriasis (L40.5-)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • compartment syndrome (traumatic) (T79.A-)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Notes

Also from chapter/block level (1 note)
Inherited from Chapter 13 Diseases of the musculoskeletal system and connective tissue
  • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

Alphabetic Index terms

Terms the official Alphabetic Index lists for this code. 1 entry