2021 ICD-10-CM Diagnosis Code M85.50

Aneurysmal bone cyst, unspecified site

    2016 2017 2018 2019 2020 2021 Billable/Specific Code
  • M85.50 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2021 edition of ICD-10-CM M85.50 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of M85.50 - other international versions of ICD-10 M85.50 may differ.
The following code(s) above M85.50 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 M85.50:
  • M00-M99
    2021 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 2021 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
  • M85.5
    ICD-10-CM Diagnosis Code M85.5

    Aneurysmal bone cyst

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Type 2 Excludes
    • aneurysmal cyst of jaw (M27.4)
    Aneurysmal bone cyst
Approximate Synonyms
  • Aneurysmal bone cyst
  • Bone cyst, aneurysmal
Clinical Information
  • Fibrous blood-filled cyst in the bone. Although benign it can be destructive causing deformity and fractures.
ICD-10-CM M85.50 is grouped within Diagnostic Related Group(s) (MS-DRG v38.0):
  • 553 Bone diseases and arthropathies with mcc
  • 554 Bone diseases and arthropathies without mcc

Convert M85.50 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
  • 2021 (effective 10/1/2020): No change

Diagnosis Index entries containing back-references to M85.50:
  • 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 2021 Billable/Specific Code

ICD-10-CM Codes Adjacent To M85.50
M85.46 Solitary bone cyst, tibia and fibula
M85.461 Solitary bone cyst, right tibia and fibula
M85.462 Solitary bone cyst, left tibia and fibula
M85.469 Solitary bone cyst, unspecified tibia and fibula
M85.47 Solitary bone cyst, ankle and foot
M85.471 Solitary bone cyst, right ankle and foot
M85.472 Solitary bone cyst, left ankle and foot
M85.479 Solitary bone cyst, unspecified ankle and foot
M85.48 …… other site
M85.5 Aneurysmal bone cyst
M85.50 …… unspecified site
M85.51 Aneurysmal bone cyst, shoulder
M85.511 Aneurysmal bone cyst, right shoulder
M85.512 Aneurysmal bone cyst, left shoulder
M85.519 Aneurysmal bone cyst, unspecified shoulder
M85.52 Aneurysmal bone cyst, upper arm
M85.521 Aneurysmal bone cyst, right upper arm
M85.522 Aneurysmal bone cyst, left upper arm
M85.529 Aneurysmal bone cyst, unspecified upper arm
M85.53 Aneurysmal bone cyst, forearm
M85.531 Aneurysmal bone cyst, right forearm

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