2020 ICD-10-CM Diagnosis Code M85.40

Solitary bone cyst, unspecified site

    2016 2017 2018 2019 2020 Billable/Specific Code
  • M85.40 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 M85.40 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of M85.40 - other international versions of ICD-10 M85.40 may differ.
The following code(s) above M85.40 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 M85.40:
  • M00-M99
    2020 ICD-10-CM Range M00-M99

    Diseases of the musculoskeletal system and connective tissue

    • 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
  • M85
    ICD-10-CM Diagnosis Code M85

    Other disorders of bone density and structure

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • osteogenesis imperfecta (Q78.0)
    • osteopetrosis (Q78.2)
    • osteopoikilosis (Q78.8)
    • polyostotic fibrous dysplasia (Q78.1)
    Other disorders of bone density and structure
  • M85.4
    ICD-10-CM Diagnosis Code M85.4

    Solitary bone cyst

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 2 Excludes
    • solitary cyst of jaw (M27.4)
    Solitary bone cyst
Approximate Synonyms
  • Bone cyst, solitary
  • Solitary bone cyst
Clinical Information
  • Benign unilocular lytic areas in the proximal end of a long bone with well defined and narrow endosteal margins. The cysts contain fluid and the cyst walls may contain some giant cells. Bone cysts usually occur in males between the ages 3-15 years.
ICD-10-CM M85.40 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 553 Bone diseases and arthropathies with mcc
  • 554 Bone diseases and arthropathies without mcc

Convert M85.40 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

Diagnosis Index entries containing back-references to M85.40:
  • Cyst (colloid) (mucous) (simple) (retention)
    • bone (local) M85.60
      ICD-10-CM Diagnosis Code M85.60

      Other cyst of bone, unspecified site

        2016 2017 2018 2019 2020 Billable/Specific Code

ICD-10-CM Codes Adjacent To M85.40
M85.361 Osteitis condensans, right lower leg
M85.362 Osteitis condensans, left lower leg
M85.369 Osteitis condensans, unspecified lower leg
M85.37 Osteitis condensans, ankle and foot
M85.371 Osteitis condensans, right ankle and foot
M85.372 Osteitis condensans, left ankle and foot
M85.379 Osteitis condensans, unspecified ankle and foot
M85.38 …… other site
M85.39 …… multiple sites
M85.4 Solitary bone cyst
M85.40 …… unspecified site
M85.41 Solitary bone cyst, shoulder
M85.411 Solitary bone cyst, right shoulder
M85.412 Solitary bone cyst, left shoulder
M85.419 Solitary bone cyst, unspecified shoulder
M85.42 Solitary bone cyst, humerus
M85.421 Solitary bone cyst, right humerus
M85.422 Solitary bone cyst, left humerus
M85.429 Solitary bone cyst, unspecified humerus
M85.43 Solitary bone cyst, ulna and radius
M85.431 Solitary bone cyst, right ulna and radius

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