Internal derangement of knee M23- >

Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as M23. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • ankylosis (
    ICD-10-CM Diagnosis Code M24.66

    Ankylosis, knee

      2016 2017 2018 Non-Billable/Non-Specific Code
    M24.66
    )
  • current injury - see injury of knee and lower leg (S80-S89
    ICD-10-CM Range S80-S89

    Injuries to the knee and lower leg

    Type 2 Excludes
    • burns and corrosions (T20-T32)
    • frostbite (T33-T34)
    • injuries of ankle and foot, except fracture of ankle and malleolus (S90-S99)
    • insect bite or sting, venomous (T63.4)
    • S80 Superficial injury of knee and lower leg
    • S81 Open wound of knee and lower leg
    • S82 Fracture of lower leg, including ankle
    • S83 Dislocation and sprain of joints and lig...
    • S84 Injury of nerves at lower leg level
    • S85 Injury of blood vessels at lower leg lev...
    • S86 Injury of muscle, fascia and tendon at l...
    • S87 Crushing injury of lower leg
    • S88 Traumatic amputation of lower leg
    • S89 Other and unspecified injuries of lower ...
    )
  • deformity of knee (
    ICD-10-CM Diagnosis Code M21
    • M21 Other acquired deformities of limbs
      • M21.0 Valgus deformity, not elsewhere classified
        • M21.00 Valgus deformity, not elsewhere classified, u...
        • M21.02 Valgus deformity, not elsewhere classified, e...
          • M21.021 Valgus deformity, not elsewhere classified, r...
          • M21.022 Valgus deformity, not elsewhere classified, l...
          • M21.029 Valgus deformity, not elsewhere classified, u...
        • M21.05 Valgus deformity, not elsewhere classified, h...
          • M21.051 Valgus deformity, not elsewhere classified, r...
          • M21.052 Valgus deformity, not elsewhere classified, l...
          • M21.059 Valgus deformity, not elsewhere classified, u...
        • M21.06 Valgus deformity, not elsewhere classified, k...
          • M21.061 Valgus deformity, not elsewhere classified, r...
          • M21.062 Valgus deformity, not elsewhere classified, l...
          • M21.069 Valgus deformity, not elsewhere classified, u...
        • M21.07 Valgus deformity, not elsewhere classified, a...
          • M21.071 Valgus deformity, not elsewhere classified, r...
          • M21.072 Valgus deformity, not elsewhere classified, l...
          • M21.079 Valgus deformity, not elsewhere classified, u...
      • M21.1 Varus deformity, not elsewhere classified
        • M21.10 Varus deformity, not elsewhere classified, un...
        • M21.12 Varus deformity, not elsewhere classified, el...
          • M21.121 Varus deformity, not elsewhere classified, ri...
          • M21.122 Varus deformity, not elsewhere classified, le...
          • M21.129 Varus deformity, not elsewhere classified, un...
        • M21.15 Varus deformity, not elsewhere classified, hi...
          • M21.151 Varus deformity, not elsewhere classified, ri...
          • M21.152 Varus deformity, not elsewhere classified, le...
          • M21.159 Varus deformity, not elsewhere classified, un...
        • M21.16 Varus deformity, not elsewhere classified, kn...
          • M21.161 Varus deformity, not elsewhere classified, ri...
          • M21.162 Varus deformity, not elsewhere classified, le...
          • M21.169 Varus deformity, not elsewhere classified, un...
        • M21.17 Varus deformity, not elsewhere classified, an...
          • M21.171 Varus deformity, not elsewhere classified, ri...
          • M21.172 Varus deformity, not elsewhere classified, le...
          • M21.179 Varus deformity, not elsewhere classified, un...
      • M21.2 Flexion deformity
        • M21.20 …… unspecified site
        • M21.21 Flexion deformity, shoulder
          • M21.211 Flexion deformity, right shoulder
          • M21.212 Flexion deformity, left shoulder
          • M21.219 Flexion deformity, unspecified shoulder
        • M21.22 Flexion deformity, elbow
          • M21.221 Flexion deformity, right elbow
          • M21.222 Flexion deformity, left elbow
          • M21.229 Flexion deformity, unspecified elbow
        • M21.23 Flexion deformity, wrist
          • M21.231 Flexion deformity, right wrist
          • M21.232 Flexion deformity, left wrist
          • M21.239 Flexion deformity, unspecified wrist
        • M21.24 Flexion deformity, finger joints
          • M21.241 Flexion deformity, right finger joints
          • M21.242 Flexion deformity, left finger joints
          • M21.249 Flexion deformity, unspecified finger joints
        • M21.25 Flexion deformity, hip
          • M21.251 Flexion deformity, right hip
          • M21.252 Flexion deformity, left hip
          • M21.259 Flexion deformity, unspecified hip
        • M21.26 Flexion deformity, knee
          • M21.261 Flexion deformity, right knee
          • M21.262 Flexion deformity, left knee
          • M21.269 Flexion deformity, unspecified knee
        • M21.27 Flexion deformity, ankle and toes
          • M21.271 Flexion deformity, right ankle and toes
          • M21.272 Flexion deformity, left ankle and toes
          • M21.279 Flexion deformity, unspecified ankle and toes...
      • M21.3 Wrist or foot drop (acquired)
      • M21.4 Flat foot [pes planus] (acquired)
        • M21.40 Flat foot [pes planus] (acquired), unspecifie...
        • M21.41 Flat foot [pes planus] (acquired), right foot...
        • M21.42 …… left foot
      • M21.5 Acquired clawhand, clubhand, clawfoot and clu...
      • M21.6 Other acquired deformities of foot
        • M21.61 Bunion
        • M21.62 Bunionette
        • M21.6X Other acquired deformities of foot
          • M21.6X1 Other acquired deformities of right foot
          • M21.6X2 Other acquired deformities of left foot
          • M21.6X9 Other acquired deformities of unspecified foo...
      • M21.7 Unequal limb length (acquired)
        • M21.70 Unequal limb length (acquired), unspecified s...
        • M21.72 Unequal limb length (acquired), humerus
          • M21.721 Unequal limb length (acquired), right humerus...
          • M21.722 Unequal limb length (acquired), left humerus
          • M21.729 Unequal limb length (acquired), unspecified h...
        • M21.73 Unequal limb length (acquired), ulna and radi...
          • M21.731 Unequal limb length (acquired), right ulna
          • M21.732 Unequal limb length (acquired), left ulna
          • M21.733 Unequal limb length (acquired), right radius
          • M21.734 Unequal limb length (acquired), left radius
          • M21.739 Unequal limb length (acquired), unspecified u...
        • M21.75 Unequal limb length (acquired), femur
          • M21.751 Unequal limb length (acquired), right femur
          • M21.752 Unequal limb length (acquired), left femur
          • M21.759 Unequal limb length (acquired), unspecified f...
        • M21.76 Unequal limb length (acquired), tibia and fib...
          • M21.761 Unequal limb length (acquired), right tibia
          • M21.762 Unequal limb length (acquired), left tibia
          • M21.763 Unequal limb length (acquired), right fibula
          • M21.764 Unequal limb length (acquired), left fibula
          • M21.769 Unequal limb length (acquired), unspecified t...
      • M21.8 Other specified acquired deformities of limbs...
        • M21.80 Other specified acquired deformities of unspe...
        • M21.82 Other specified acquired deformities of upper...
          • M21.821 Other specified acquired deformities of right...
          • M21.822 Other specified acquired deformities of left ...
          • M21.829 Other specified acquired deformities of unspe...
        • M21.83 Other specified acquired deformities of forea...
          • M21.831 Other specified acquired deformities of right...
          • M21.832 Other specified acquired deformities of left ...
          • M21.839 Other specified acquired deformities of unspe...
        • M21.85 Other specified acquired deformities of thigh...
          • M21.851 Other specified acquired deformities of right...
          • M21.852 Other specified acquired deformities of left ...
          • M21.859 Other specified acquired deformities of unspe...
        • M21.86 Other specified acquired deformities of lower...
          • M21.861 Other specified acquired deformities of right...
          • M21.862 Other specified acquired deformities of left ...
          • M21.869 Other specified acquired deformities of unspe...
      • M21.9 Unspecified acquired deformity of limb and ha...
        • M21.90 Unspecified acquired deformity of unspecified...
        • M21.92 Unspecified acquired deformity of upper arm
          • M21.921 Unspecified acquired deformity of right upper...
          • M21.922 Unspecified acquired deformity of left upper ...
          • M21.929 Unspecified acquired deformity of unspecified...
        • M21.93 Unspecified acquired deformity of forearm
          • M21.931 Unspecified acquired deformity of right forea...
          • M21.932 Unspecified acquired deformity of left forear...
          • M21.939 Unspecified acquired deformity of unspecified...
        • M21.94 Unspecified acquired deformity of hand
          • M21.941 Unspecified acquired deformity of hand, right...
          • M21.942 Unspecified acquired deformity of hand, left ...
          • M21.949 Unspecified acquired deformity of hand, unspe...
        • M21.95 Unspecified acquired deformity of thigh
          • M21.951 Unspecified acquired deformity of right thigh...
          • M21.952 Unspecified acquired deformity of left thigh
          • M21.959 Unspecified acquired deformity of unspecified...
        • M21.96 Unspecified acquired deformity of lower leg
          • M21.961 Unspecified acquired deformity of right lower...
          • M21.962 Unspecified acquired deformity of left lower ...
          • M21.969 Unspecified acquired deformity of unspecified...
    M21.-
    )
  • osteochondritis dissecans (
    ICD-10-CM Diagnosis Code M93.2

    Osteochondritis dissecans

      2016 2017 2018 Non-Billable/Non-Specific Code
    M93.2
    )
  • recurrent dislocation or subluxation of joints (
    ICD-10-CM Diagnosis Code M24.4

    Recurrent dislocation of joint

      2016 2017 2018 Non-Billable/Non-Specific Code
    Applicable To
    • Recurrent subluxation of joint
    Type 2 Excludes
    M24.4
    )
  • recurrent dislocation or subluxation of patella (
    ICD-10-CM Diagnosis Code M22.0

    Recurrent dislocation of patella

      2016 2017 2018 Non-Billable/Non-Specific Code
    M22.0-
    ICD-10-CM Diagnosis Code M22.1

    Recurrent subluxation of patella

      2016 2017 2018 Non-Billable/Non-Specific Code
    Applicable To
    • Incomplete dislocation of patella
    M22.1
    )
Codes