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ICD-10-CM Codes
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M00-M99
Diseases of the musculoskeletal system and connective tissue
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M20-M25
Other joint disorders
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M20-
Acquired deformities of fingers and toes
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2021 ICD-10-CM Diagnosis Code M20.1
2021 ICD-10-CM Diagnosis Code M20.1
Hallux valgus (acquired)
2016 2017 2018 2019 2020 2021 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 2021 edition of ICD-10-CM M20.1 became effective on October 1, 2020.
- This is the American ICD-10-CM version of M20.1 - other international versions of ICD-10 M20.1 may differ.
Type 2 ExcludesType 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.
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
2021 ICD-10-CM Range M00-M99
Diseases of the musculoskeletal system and connective tissueNote- 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)
- M20-M25
2021 ICD-10-CM Range M20-M25
Other joint disorders - M20
ICD-10-CM Diagnosis Code M20
Acquired deformities of fingers and toes
2016 2017 2018 2019 2020 2021 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.-)
- 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
- 2021 (effective 10/1/2020): No change
Code annotations containing back-references to M20.1:
- Deformity Q89.9
ICD-10-CM Diagnosis Code Q89.9
Congenital malformation, unspecified
2016 2017 2018 2019 2020 2021 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 2021 Non-Billable/Non-Specific Code
- Hallux
ICD-10-CM Codes Adjacent To M20.1
M20.029 …… of unspecified 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)
M20.1
Hallux valgus (acquired)
M20.3 Hallux varus (acquired)
Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.
