ICDcodes.org
FY2027

M43.20 — Fusion of spine, site unspecified

BillableUnspecified

Is M43.20 billable?

Yes, but M43.20 is an unspecified code. M43.20 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, M43.20 is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting M43.20 — the more specific alternatives are listed below.

M43.20 at a glance

CodeM43.20
DescriptionFusion of spine, site unspecified
BillableYes
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027

Which MS-DRGs does M43.20 group to?

M43.20 sits in MDC 08 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

  • 551Medical Back Problems with MCCmedical
  • 552Medical Back Problems without MCCmedical

How is M43.20 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to M43.20. They show the wording a clinician may have documented, which often differs from the Tabular description.

  • Fusion, fused › spineNEC (congenital)

Excludes1 — never code together — inherited from M43

The conditions below can never be reported together with M43.20 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

  • 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.-)

Excludes1 — never code together — inherited from M43.2

The conditions below can never be reported together with M43.20 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

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

Excludes2 — not included here — inherited from Chapter 13

The conditions below are not part of M43.20, but a patient may have both at the same time. When documentation supports it, M43.20 and the excluded code may both be reported.

  • 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)

Excludes2 — not included here — inherited from M43.2

The conditions below are not part of M43.20, but a patient may have both at the same time. When documentation supports it, M43.20 and the excluded code may both be reported.

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

How long has M43.20 existed?

M43.20 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.

What other codes are in the M43.2 family? (8)