Try for free

M24.66 ICD-10-CA code: Ankylosis of joint, lower leg

M24.66 is the ICD-10-CA code for “Ankylosis of joint, lower leg” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.

Official description

M24.66

Ankylosis of joint, lower leg

Short description: Ankylosis of joint lower leg

ICD-10-CA · Canada · Also written M2466

Notes for M24.66

As CIHI prints them, with any note M24.66 takes from the headings above it.

Includes

Excludes

Conditions classified elsewhere.

  • Spine (M43.2)stiffness of joint without ankylosis (M25.6)From M24.6 Ankylosis of joint
  • Current injury - see injury of joint by body regionganglion (M67.4)snapping knee (M23.8)temporomandibular joint disorders (K07.6-)From M24 Other specific joint derangements
  • Joints of the spine (M40-M54)From M20-M25 Other joint disorders
  • 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

  • [To review the anatomical site captured in the 5th character subclassification see Chapter XIII]From M24.6 Ankylosis of joint
  • 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 M24.66 sits

  1. 1ChapterChapter 13: Diseases of the musculoskeletal system and connective tissue (M00-M99)
  2. 2Block M00-M25Arthropathies
  3. 3Block M20-M25Other joint disorders
  4. 4Category M24Other specific joint derangements
  5. 5Subcategory M24.6Ankylosis of joint
  6. 6Valid code M24.66Ankylosis of joint, lower leg

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 M24.66 in the CIHI source

Frequently asked questions

What does ICD-10-CA code M24.66 mean?

M24.66 is the ICD-10-CA code for “Ankylosis of joint, lower leg” in CIHI’s ICD-10-CA FY 2026–2027 release.

Where is M24.66 in ICD-10-CA?

M24.66 sits under M24.6 Ankylosis of joint, within M24 Other specific joint derangements, within M20-M25 Other joint disorders, within M00-M25 Arthropathies, within Chapter 13: Diseases of the musculoskeletal system and connective tissue (M00-M99).

What coding notes apply to M24.66?

ICD-10-CA lists Note, Excludes, Includes notes for M24.66, 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 M24.66

M24.60Ankylosis of joint, multiple sitesM24.61Ankylosis of joint, shoulder regionM24.62Ankylosis of joint, upper armM24.63Ankylosis of joint, forearmM24.64Ankylosis of joint, handM24.65Ankylosis of joint, pelvic region and thighM24.67Ankylosis of joint, ankle and footM24.68Ankylosis of joint, other siteM24.69Ankylosis of joint, unspecified site