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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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M21-
Other acquired deformities of limbs
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2020 ICD-10-CM Diagnosis Code M21.159
2020 ICD-10-CM Diagnosis Code M21.159
Varus deformity, not elsewhere classified, unspecified
2016 2017 2018 2019 2020 Billable/Specific Code
- M21.159 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
- The 2020 edition of ICD-10-CM M21.159 became effective on October 1, 2019.
- This is the American ICD-10-CM version of M21.159 - other international versions of ICD-10 M21.159 may differ.
The following code(s) above
M21.159 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
M21.159:
- M00-M99
2020 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
2020 ICD-10-CM Range M20-M25
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)
- M21.1
ICD-10-CM Diagnosis Code M21.1
Varus deformity, not elsewhere classified
2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
- 564 Other musculoskeletal system and connective tissue diagnoses with mcc
- 565 Other musculoskeletal system and connective tissue diagnoses with cc
- 566 Other musculoskeletal system and connective tissue diagnoses without cc/mcc
Convert M21.159 to ICD-9-CM
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
ICD-10-CM Codes Adjacent To M21.159
M21.079 Valgus deformity, not elsewhere classified, unspecified ankle
M21.1 Varus deformity, not elsewhere classified
M21.12 Varus deformity, not elsewhere classified, elbow
M21.121 Varus deformity, not elsewhere classified, right elbow
M21.122 Varus deformity, not elsewhere classified, left elbow
M21.129 Varus deformity, not elsewhere classified, unspecified elbow
M21.15 Varus deformity, not elsewhere classified, hip
M21.151 Varus deformity, not elsewhere classified, right hip
M21.152 Varus deformity, not elsewhere classified, left hip
M21.159
Varus deformity, not elsewhere classified, unspecified
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
Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.
