2020 ICD-10-CM Diagnosis Code T21.73

Corrosion of third degree of upper back

    2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
  • T21.73 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 T21.73 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of T21.73 - other international versions of ICD-10 T21.73 may differ.
Applicable To
  • Corrosion of third degree of interscapular region
The following code(s) above T21.73 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 T21.73:
  • 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
  • T20-T25
    2020 ICD-10-CM Range T20-T25

    Burns and corrosions of external body surface, specified by site

    Includes
    • burns and corrosions of first degree [erythema]
    • burns and corrosions of second degree [blisters][epidermal loss]
    • burns and corrosions of third degree [deep necrosis of underlying tissue] [full- thickness skin loss]
    Use Additional
    • code from category T31 or T32 to identify extent of body surface involved
    Burns and corrosions of external body surface, specified by site
  • T21
    ICD-10-CM Diagnosis Code T21

    Burn and corrosion of trunk

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Includes
    • burns and corrosion of hip region
    Type 2 Excludes
    • burns and corrosion of axilla (T22.- with fifth character 4)
    • burns and corrosion of scapular region (T22.- with fifth character 6)
    • burns and corrosion of shoulder (T22.- with fifth character 5)
    Burn and corrosion of trunk
  • T21.7
    ICD-10-CM Diagnosis Code T21.7

    Corrosion of third degree of trunk

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Code First
    • (T51-T65) to identify chemical and intent
    Use Additional
    • external cause code to identify place (Y92)
    Corrosion of third degree of trunk
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

Diagnosis Index entries containing back-references to T21.73:
  • Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal) T30.4
    ICD-10-CM Diagnosis Code T30.4

    Corrosion of unspecified body region, unspecified degree

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • This code is not for inpatient use. Code to specified site and degree of corrosion
    • Corrosion NOS
    • Multiple corrosion NOS
    • back (lower) T21.44
      ICD-10-CM Diagnosis Code T21.44

      Corrosion of unspecified degree of lower back

        2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
      • upper T21.43
        ICD-10-CM Diagnosis Code T21.43

        Corrosion of unspecified degree of upper back

          2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
        Applicable To
        • Corrosion of unspecified degree of interscapular region
        • third degree T21.73

ICD-10-CM Codes Adjacent To T21.73
T21.70XD …… subsequent encounter
T21.70XS …… sequela
T21.71 Corrosion of third degree of chest wall
T21.71XA …… initial encounter
T21.71XD …… subsequent encounter
T21.71XS …… sequela
T21.72 Corrosion of third degree of abdominal wall
T21.72XA …… initial encounter
T21.72XD …… subsequent encounter
T21.72XS …… sequela
T21.73 Corrosion of third degree of upper back
T21.73XA …… initial encounter
T21.73XD …… subsequent encounter
T21.73XS …… sequela
T21.74 Corrosion of third degree of lower back
T21.74XA …… initial encounter
T21.74XD …… subsequent encounter
T21.74XS …… sequela
T21.75 Corrosion of third degree of buttock
T21.75XA …… initial encounter
T21.75XD …… subsequent encounter

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