2020 ICD-10-CM Diagnosis Code M20.1

Hallux valgus (acquired)

    2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
  • M20.1 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 M20.1 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of M20.1 - other international versions of ICD-10 M20.1 may differ.
Type 2 Excludes
Type 2 Excludes Help
A type 2 excludes note represents "not included here". A type 2 excludes note indicates that the condition excluded is not part of the condition it is excluded from but a patient may have both conditions at the same time. When a type 2 excludes note appears under a code it is acceptable to use both the code (M20.1) and the excluded code together.
  • bunion (
    ICD-10-CM Diagnosis Code M21.6

    Other acquired deformities of foot

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 2 Excludes
    M21.6-
    )
The following code(s) above M20.1 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 M20.1:
  • 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
  • M20
    ICD-10-CM Diagnosis Code M20

    Acquired deformities of fingers and toes

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • acquired absence of fingers and toes (Z89.-)
    • congenital absence of fingers and toes (Q71.3-, Q72.3-)
    • congenital deformities and malformations of fingers and toes (Q66.-, Q68-Q70, Q74.-)
    Acquired deformities of fingers and toes
Clinical Information
  • A painful, inflamed swelling of the bursa at the first joint of the big toe
  • Abnormal swelling of the inner aspect of the first metatarsal head affecting the first metatarsophalangeal joint.
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 M20.1:
  • Type 1 Excludes: M71
    ICD-10-CM Diagnosis Code M71

    Other bursopathies

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • bunion (M20.1)
    • bursitis related to use, overuse or pressure (M70.-)
    • enthesopathies (M76-M77)
  • Type 2 Excludes: M21.6
    ICD-10-CM Diagnosis Code M21.6

    Other acquired deformities of foot

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 2 Excludes

Diagnosis Index entries containing back-references to M20.1:
  • 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
    • toe (acquired) M20.6-
      ICD-10-CM Diagnosis Code M20.6-

      Acquired deformities of toe(s), unspecified

        2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
      • hallux valgus M20.1-
  • Hallux

ICD-10-CM Codes Adjacent To M20.1
M20.022 …… of left finger(s)
M20.029 …… of unspecified finger(s)
M20.03 Swan-neck deformity
M20.031 …… of right finger(s)
M20.032 …… of left finger(s)
M20.039 …… of unspecified finger(s)
M20.09 Other deformity of finger(s)
M20.091 Other deformity of right finger(s)
M20.092 Other deformity of left finger(s)
M20.099 …… unspecified finger(s)
M20.1 Hallux valgus (acquired)
M20.10 …… unspecified foot
M20.11 …… right foot
M20.12 …… left foot
M20.2 Hallux rigidus
M20.20 …… unspecified foot
M20.21 …… right foot
M20.22 …… left foot
M20.3 Hallux varus (acquired)
M20.30 …… unspecified foot
M20.31 …… right foot

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