2020 ICD-10-CM Diagnosis Code M21.21

Flexion deformity, shoulder

    2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
  • M21.21 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 M21.21 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of M21.21 - other international versions of ICD-10 M21.21 may differ.
The following code(s) above M21.21 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 M21.21:
  • M00-M99
    2020 ICD-10-CM Range M00-M99

    Diseases of the musculoskeletal system and connective tissue

    Note
    • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition
    Type 2 Excludes
    • arthropathic psoriasis (L40.5-)
    • certain conditions originating in the perinatal period (P04-P96)
    • certain infectious and parasitic diseases (A00-B99)
    • compartment syndrome (traumatic) (T79.A-)
    • complications of pregnancy, childbirth and the puerperium (O00-O9A)
    • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
    • endocrine, nutritional and metabolic diseases (E00-E88)
    • injury, poisoning and certain other consequences of external causes (S00-T88)
    • neoplasms (C00-D49)
    • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
    Diseases of the musculoskeletal system and connective tissue
  • M20-M25
    2020 ICD-10-CM Range M20-M25

    Other joint disorders

    Type 2 Excludes
    Other joint disorders
  • M21
    ICD-10-CM Diagnosis Code M21

    Other acquired deformities of limbs

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • acquired absence of limb (Z89.-)
    • congenital absence of limbs (Q71-Q73)
    • congenital deformities and malformations of limbs (Q65-Q66, Q68-Q74)
    Type 2 Excludes
    • acquired deformities of fingers or toes (M20.-)
    • coxa plana (M91.2)
    Other acquired deformities of limbs
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 M21.21:
  • Deformity Q89.9
    ICD-10-CM Diagnosis Code Q89.9

    Congenital malformation, unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code POA Exempt
    Applicable To
    • Congenital anomaly NOS
    • Congenital deformity NOS
    • limb (acquired) M21.90
      ICD-10-CM Diagnosis Code M21.90

      Unspecified acquired deformity of unspecified limb

        2016 2017 2018 2019 2020 Billable/Specific Code
      • flexion M21.20
        ICD-10-CM Diagnosis Code M21.20

        Flexion deformity, unspecified site

          2016 2017 2018 2019 2020 Billable/Specific Code
        • shoulder M21.21-

ICD-10-CM Codes Adjacent To M21.21
M21.16 Varus deformity, not elsewhere classified, knee
M21.161 Varus deformity, not elsewhere classified, right knee
M21.162 Varus deformity, not elsewhere classified, left knee
M21.169 Varus deformity, not elsewhere classified, unspecified knee
M21.17 Varus deformity, not elsewhere classified, ankle
M21.171 Varus deformity, not elsewhere classified, right ankle
M21.172 Varus deformity, not elsewhere classified, left ankle
M21.179 Varus deformity, not elsewhere classified, unspecified ankle
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

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