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M43.01 ICD-10-CA code: Spondylolysis, occipito-atlanto-axial region

M43.01 is the ICD-10-CA code for “Spondylolysis, occipito-atlanto-axial region” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.

Official description

M43.01

Spondylolysis, occipito-atlanto-axial region

Short description: Spondylolysis occipitoatlantoaxial

ICD-10-CA · Canada · Also written M4301

Notes for M43.01

As CIHI prints them, with any note M43.01 takes from the headings above it.

Excludes

Conditions classified elsewhere.

  • 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-M81)• Paget's disease of bone [osteitis deformans] (M88.-)From M43 Other deforming dorsopathies
  • Certain:• conditions originating in the perinatal period (P00-P96)• disorders of the temporomandibular joint (K07.6)• infectious and parasitic diseases (A00-B99)compartment syndrome (T79.6)complications of pregnancy, childbirth and the puerperium (O00-O99)congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)endocrine, nutritional and metabolic diseases (E00-E90)injury, poisoning and certain other consequences of external causes (S00-T98)neoplasms (C00-D48)symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)From Chapter 13: Diseases of the musculoskeletal system and connective tissue (M00-M99)

Note

  • The following fifth characters represent the following sites of involvement:0 Multiple sites1 Shoulder region: clavical , scapula — joint acromioclavicular, glenohumeral, sternoclavicular2 Upper arm: humerus — elbow joint,3 Forearm: radius , ulna — wrist joint,4 Hand: carpus, fingers, metacarpus — joints between these bones,5 Pelvic region and thigh: buttock , femur , pelvis — joint hip , sacroiliac6 Lower leg: fibula , tibia — knee joint7 Ankle and foot: metatarsus, tarsus, toes — other joints in foot8 Other:head neck ribs skull trunk vertebral column9 Site unspecifiedFrom Chapter 13: Diseases of the musculoskeletal system and connective tissue (M00-M99)

Where M43.01 sits

  1. 1ChapterChapter 13: Diseases of the musculoskeletal system and connective tissue (M00-M99)
  2. 2Block M40-M54Dorsopathies
  3. 3Block M40-M43Deforming dorsopathies
  4. 4Category M43Other deforming dorsopathies
  5. 5Subcategory M43.0Spondylolysis
  6. 6Valid code M43.01Spondylolysis, occipito-atlanto-axial region

Source and release

Data release
ICD-10-CA · FY 2026–2027
Effective date
Apr 1, 2026
Publisher
CIHI

This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.

See M43.01 in the CIHI source

Frequently asked questions

What does ICD-10-CA code M43.01 mean?

M43.01 is the ICD-10-CA code for “Spondylolysis, occipito-atlanto-axial region” in CIHI’s ICD-10-CA FY 2026–2027 release.

Where is M43.01 in ICD-10-CA?

M43.01 sits under M43.0 Spondylolysis, within M43 Other deforming dorsopathies, within M40-M43 Deforming dorsopathies, within M40-M54 Dorsopathies, within Chapter 13: Diseases of the musculoskeletal system and connective tissue (M00-M99).

What coding notes apply to M43.01?

ICD-10-CA lists Excludes, Note notes for M43.01, including those from the headings it sits under. They are listed on this page with where each one comes from.

Which ICD-10-CA release does this page use?

It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.

Codes beside M43.01

M43.00Spondylolysis, multiple sites in spineM43.02Spondylolysis, cervical regionM43.03Spondylolysis, cervicothoracic regionM43.04Spondylolysis, thoracic regionM43.05Spondylolysis, thoracolumbar regionM43.06Spondylolysis, lumbar regionM43.07Spondylolysis, lumbosacral regionM43.08Spondylolysis, sacral and sacrococcygeal regionM43.09Spondylolysis, unspecified site