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M21.6 ICD-10-CA code: Other acquired deformities of ankle and foot

M21.6 is the ICD-10-CA code for “Other acquired deformities of ankle and foot” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.

Official description

M21.6

Other acquired deformities of ankle and foot

Short description: Other acquired deformity ankle & foot

ICD-10-CA · Canada · Also written M216

Index terms

Entries in CIHI’s alphabetical index that lead to M21.6. Searching the index by the condition the note names is how coders reach this code.

  • Pronation, foot
  • Pronation, ankle
  • Deformity, heel (acquired)
  • Deformity, foot (acquired) NEC
  • Deformity, metatarsus (acquired)
  • Cavus foot (congenital), acquired
  • Hollow foot (congenital), acquired
  • Deformity, ankle (joint) (acquired) NEC
  • Pes, deformity (congenital), acquired NEC

Notes for M21.6

As CIHI prints them, with any note M21.6 takes from the headings above it.

Includes

Excludes

Conditions classified elsewhere.

  • Deformities of toe (acquired) (M20.1-M20.6)
  • Acquired:• absence of limb (Z89.-)• deformities of fingers or toes (M20.-)congenital:• absence of limbs (Q71-Q73)• deformities and malformations of limbs (Q65-Q66)(Q68-Q74)coxa plana (M91.2)From M21 Other acquired deformities of limbs
  • 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

  • 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 M21.6 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 M21Other acquired deformities of limbs
  5. 5Valid code M21.6Other acquired deformities of ankle and foot

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 M21.6 in the CIHI source

Frequently asked questions

What does ICD-10-CA code M21.6 mean?

M21.6 is the ICD-10-CA code for “Other acquired deformities of ankle and foot” in CIHI’s ICD-10-CA FY 2026–2027 release.

Where is M21.6 in ICD-10-CA?

M21.6 sits under M21 Other acquired deformities of limbs, 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 M21.6?

ICD-10-CA lists Excludes, Includes, Note notes for M21.6, 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 M21.6

M21.0Valgus deformity, not elsewhere classifiedM21.1Varus deformity, not elsewhere classifiedM21.2Flexion deformityM21.3Wrist or foot drop (acquired)M21.4Flat foot [pes planus] (acquired)M21.5Acquired clawhand, clubhand, clawfoot and clubfootM21.7Unequal limb length (acquired)M21.8Other specified acquired deformities of limbsM21.9Acquired deformity of limb, unspecified