2020 ICD-10-CM Diagnosis Code S91

Open wound of ankle, foot and toes

    2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
  • S91 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2020 edition of ICD-10-CM S91 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of S91 - other international versions of ICD-10 S91 may differ.
Code Also
Code Also Help
A code also note instructs that 2 codes may be required to fully describe a condition but the sequencing of the two codes is discretionary, depending on the severity of the conditions and the reason for the encounter.
  • any associated wound infection
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 S91. 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.
  • open fracture of ankle, foot and toes (
    ICD-10-CM Diagnosis Code S92
    • S92.0 Fracture of calcaneus
    • S92.1 Fracture of talus
    • S92.2 Fracture of other and unspecified tarsal bone(s)
    • S92.3 Fracture of metatarsal bone(s)
    • S92.4 Fracture of great toe
    • S92.5 Fracture of lesser toe(s)
    • S92.8 Other fracture of foot, except ankle
    • S92.9 Unspecified fracture of foot and toe
    S92.-
    with 7th character B)
  • traumatic amputation of ankle and foot (
    ICD-10-CM Diagnosis Code S98
    • S98 Traumatic amputation of ankle and foot
      • S98.0 Traumatic amputation of foot at ankle level
        • S98.01 Complete traumatic amputation of foot at ankl...
          • S98.011 Complete traumatic amputation of right foot a...
            • S98.011A Complete traumatic amputation of right foot a...
            • S98.011D Complete traumatic amputation of right foot a...
            • S98.011S Complete traumatic amputation of right foot a...
          • S98.012 Complete traumatic amputation of left foot at...
            • S98.012A Complete traumatic amputation of left foot at...
            • S98.012D Complete traumatic amputation of left foot at...
            • S98.012S Complete traumatic amputation of left foot at...
          • S98.019 Complete traumatic amputation of unspecified ...
            • S98.019A Complete traumatic amputation of unspecified ...
            • S98.019D Complete traumatic amputation of unspecified ...
            • S98.019S Complete traumatic amputation of unspecified ...
        • S98.02 Partial traumatic amputation of foot at ankle...
          • S98.021 Partial traumatic amputation of right foot at...
            • S98.021A Partial traumatic amputation of right foot at...
            • S98.021D Partial traumatic amputation of right foot at...
            • S98.021S Partial traumatic amputation of right foot at...
          • S98.022 Partial traumatic amputation of left foot at ...
            • S98.022A Partial traumatic amputation of left foot at ...
            • S98.022D Partial traumatic amputation of left foot at ...
            • S98.022S Partial traumatic amputation of left foot at ...
          • S98.029 Partial traumatic amputation of unspecified f...
            • S98.029A Partial traumatic amputation of unspecified f...
            • S98.029D Partial traumatic amputation of unspecified f...
            • S98.029S Partial traumatic amputation of unspecified f...
      • S98.1 Traumatic amputation of one toe
        • S98.11 Complete traumatic amputation of great toe
          • S98.111 Complete traumatic amputation of right great ...
            • S98.111A Complete traumatic amputation of right great ...
            • S98.111D Complete traumatic amputation of right great ...
            • S98.111S Complete traumatic amputation of right great ...
          • S98.112 Complete traumatic amputation of left great t...
            • S98.112A Complete traumatic amputation of left great t...
            • S98.112D Complete traumatic amputation of left great t...
            • S98.112S Complete traumatic amputation of left great t...
          • S98.119 Complete traumatic amputation of unspecified ...
            • S98.119A Complete traumatic amputation of unspecified ...
            • S98.119D Complete traumatic amputation of unspecified ...
            • S98.119S Complete traumatic amputation of unspecified ...
        • S98.12 Partial traumatic amputation of great toe
          • S98.121 Partial traumatic amputation of right great t...
            • S98.121A Partial traumatic amputation of right great t...
            • S98.121D Partial traumatic amputation of right great t...
            • S98.121S Partial traumatic amputation of right great t...
          • S98.122 Partial traumatic amputation of left great to...
            • S98.122A Partial traumatic amputation of left great to...
            • S98.122D Partial traumatic amputation of left great to...
            • S98.122S Partial traumatic amputation of left great to...
          • S98.129 Partial traumatic amputation of unspecified g...
            • S98.129A Partial traumatic amputation of unspecified g...
            • S98.129D Partial traumatic amputation of unspecified g...
            • S98.129S Partial traumatic amputation of unspecified g...
        • S98.13 Complete traumatic amputation of one lesser t...
          • S98.131 Complete traumatic amputation of one right le...
            • S98.131A Complete traumatic amputation of one right le...
            • S98.131D Complete traumatic amputation of one right le...
            • S98.131S Complete traumatic amputation of one right le...
          • S98.132 Complete traumatic amputation of one left les...
            • S98.132A Complete traumatic amputation of one left les...
            • S98.132D Complete traumatic amputation of one left les...
            • S98.132S Complete traumatic amputation of one left les...
          • S98.139 Complete traumatic amputation of one unspecif...
            • S98.139A Complete traumatic amputation of one unspecif...
            • S98.139D Complete traumatic amputation of one unspecif...
            • S98.139S Complete traumatic amputation of one unspecif...
        • S98.14 Partial traumatic amputation of one lesser to...
          • S98.141 Partial traumatic amputation of one right les...
            • S98.141A Partial traumatic amputation of one right les...
            • S98.141D Partial traumatic amputation of one right les...
            • S98.141S Partial traumatic amputation of one right les...
          • S98.142 Partial traumatic amputation of one left less...
            • S98.142A Partial traumatic amputation of one left less...
            • S98.142D Partial traumatic amputation of one left less...
            • S98.142S Partial traumatic amputation of one left less...
          • S98.149 Partial traumatic amputation of one unspecifi...
            • S98.149A Partial traumatic amputation of one unspecifi...
            • S98.149D Partial traumatic amputation of one unspecifi...
            • S98.149S Partial traumatic amputation of one unspecifi...
      • S98.2 Traumatic amputation of two or more lesser to...
        • S98.21 Complete traumatic amputation of two or more ...
          • S98.211 Complete traumatic amputation of two or more ...
            • S98.211A Complete traumatic amputation of two or more ...
            • S98.211D Complete traumatic amputation of two or more ...
            • S98.211S Complete traumatic amputation of two or more ...
          • S98.212 Complete traumatic amputation of two or more ...
            • S98.212A Complete traumatic amputation of two or more ...
            • S98.212D Complete traumatic amputation of two or more ...
            • S98.212S Complete traumatic amputation of two or more ...
          • S98.219 Complete traumatic amputation of two or more ...
            • S98.219A Complete traumatic amputation of two or more ...
            • S98.219D Complete traumatic amputation of two or more ...
            • S98.219S Complete traumatic amputation of two or more ...
        • S98.22 Partial traumatic amputation of two or more l...
          • S98.221 Partial traumatic amputation of two or more r...
            • S98.221A Partial traumatic amputation of two or more r...
            • S98.221D Partial traumatic amputation of two or more r...
            • S98.221S Partial traumatic amputation of two or more r...
          • S98.222 Partial traumatic amputation of two or more l...
            • S98.222A Partial traumatic amputation of two or more l...
            • S98.222D Partial traumatic amputation of two or more l...
            • S98.222S Partial traumatic amputation of two or more l...
          • S98.229 Partial traumatic amputation of two or more u...
            • S98.229A Partial traumatic amputation of two or more u...
            • S98.229D Partial traumatic amputation of two or more u...
            • S98.229S Partial traumatic amputation of two or more u...
      • S98.3 Traumatic amputation of midfoot
        • S98.31 Complete traumatic amputation of midfoot
          • S98.311 Complete traumatic amputation of right midfoo...
            • S98.311A Complete traumatic amputation of right midfoo...
            • S98.311D Complete traumatic amputation of right midfoo...
            • S98.311S Complete traumatic amputation of right midfoo...
          • S98.312 Complete traumatic amputation of left midfoot...
            • S98.312A Complete traumatic amputation of left midfoot...
            • S98.312D Complete traumatic amputation of left midfoot...
            • S98.312S Complete traumatic amputation of left midfoot...
          • S98.319 Complete traumatic amputation of unspecified ...
            • S98.319A Complete traumatic amputation of unspecified ...
            • S98.319D Complete traumatic amputation of unspecified ...
            • S98.319S Complete traumatic amputation of unspecified ...
        • S98.32 Partial traumatic amputation of midfoot
          • S98.321 Partial traumatic amputation of right midfoot...
            • S98.321A Partial traumatic amputation of right midfoot...
            • S98.321D Partial traumatic amputation of right midfoot...
            • S98.321S Partial traumatic amputation of right midfoot...
          • S98.322 Partial traumatic amputation of left midfoot
            • S98.322A Partial traumatic amputation of left midfoot,...
            • S98.322D Partial traumatic amputation of left midfoot,...
            • S98.322S Partial traumatic amputation of left midfoot,...
          • S98.329 Partial traumatic amputation of unspecified m...
            • S98.329A Partial traumatic amputation of unspecified m...
            • S98.329D Partial traumatic amputation of unspecified m...
            • S98.329S Partial traumatic amputation of unspecified m...
      • S98.9 Traumatic amputation of foot, level unspecifi...
        • S98.91 Complete traumatic amputation of foot, level ...
          • S98.911 Complete traumatic amputation of right foot, ...
            • S98.911A Complete traumatic amputation of right foot, ...
            • S98.911D Complete traumatic amputation of right foot, ...
            • S98.911S Complete traumatic amputation of right foot, ...
          • S98.912 Complete traumatic amputation of left foot, l...
            • S98.912A Complete traumatic amputation of left foot, l...
            • S98.912D Complete traumatic amputation of left foot, l...
            • S98.912S Complete traumatic amputation of left foot, l...
          • S98.919 Complete traumatic amputation of unspecified ...
            • S98.919A Complete traumatic amputation of unspecified ...
            • S98.919D Complete traumatic amputation of unspecified ...
            • S98.919S Complete traumatic amputation of unspecified ...
        • S98.92 Partial traumatic amputation of foot, level u...
          • S98.921 Partial traumatic amputation of right foot, l...
            • S98.921A Partial traumatic amputation of right foot, l...
            • S98.921D Partial traumatic amputation of right foot, l...
            • S98.921S Partial traumatic amputation of right foot, l...
          • S98.922 Partial traumatic amputation of left foot, le...
            • S98.922A Partial traumatic amputation of left foot, le...
            • S98.922D Partial traumatic amputation of left foot, le...
            • S98.922S Partial traumatic amputation of left foot, le...
          • S98.929 Partial traumatic amputation of unspecified f...
            • S98.929A Partial traumatic amputation of unspecified f...
            • S98.929D Partial traumatic amputation of unspecified f...
            • S98.929S Partial traumatic amputation of unspecified f...
    S98.-
    )
The following code(s) above S91 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to S91:
  • S00-T88
    2020 ICD-10-CM Range S00-T88

    Injury, poisoning and certain other consequences of external causes

    Note
    • Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
    Type 1 Excludes
    Use Additional
    • code to identify any retained foreign body, if applicable (Z18.-)
    Injury, poisoning and certain other consequences of external causes
  • S90-S99
    2020 ICD-10-CM Range S90-S99

    Injuries to the ankle and foot

    Type 2 Excludes
    • burns and corrosions (T20-T32)
    • fracture of ankle and malleolus (S82.-)
    • frostbite (T33-T34)
    • insect bite or sting, venomous (T63.4)
    Injuries to the ankle and foot
Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
Code annotations containing back-references to S91:
  • Code Also: S94
    , S95
    , S96
    ICD-10-CM Diagnosis Code S94

    Injury of nerves at ankle and foot level

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Code Also
    • any associated open wound (S91.-)
    ICD-10-CM Diagnosis Code S95

    Injury of blood vessels at ankle and foot level

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Code Also
    • any associated open wound (S91.-)
    Type 2 Excludes
    ICD-10-CM Diagnosis Code S96

    Injury of muscle and tendon at ankle and foot level

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Code Also
    • any associated open wound (S91.-)
    Type 2 Excludes
    • injury of Achilles tendon (S86.0-)
    • sprain of joints and ligaments of ankle and foot (S93.-)
  • Type 2 Excludes: S81
    , S71
    ICD-10-CM Diagnosis Code S81

    Open wound of knee and lower leg

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Code Also
    • any associated wound infection
    Type 1 Excludes
    • open fracture of knee and lower leg (S82.-)
    • traumatic amputation of lower leg (S88.-)
    Type 2 Excludes
    • open wound of ankle and foot (S91.-)
    ICD-10-CM Diagnosis Code S71

    Open wound of hip and thigh

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Code Also
    • any associated wound infection
    Type 1 Excludes
    • open fracture of hip and thigh (S72.-)
    • traumatic amputation of hip and thigh (S78.-)
    Type 2 Excludes
    • bite of venomous animal (T63.-)
    • open wound of ankle, foot and toes (S91.-)
    • open wound of knee and lower leg (S81.-)
ICD-10-CM Codes Adjacent To S91
S90.934D …… subsequent encounter
S90.934S …… sequela
S90.935 Unspecified superficial injury of left lesser toe(s)
S90.935A …… initial encounter
S90.935D …… subsequent encounter
S90.935S …… sequela
S90.936 Unspecified superficial injury of unspecified lesser toe(s)
S90.936A …… initial encounter
S90.936D …… subsequent encounter
S90.936S …… sequela
S91 Open wound of ankle, foot and toes
S91.0 Open wound of ankle
S91.00 Unspecified open wound of ankle
S91.001 Unspecified open wound, right ankle
S91.001A …… initial encounter
S91.001D …… subsequent encounter
S91.001S …… sequela
S91.002 Unspecified open wound, left ankle
S91.002A …… initial encounter
S91.002D …… subsequent encounter
S91.002S …… sequela

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.