2020 ICD-10-CM Diagnosis Code M18.9

Osteoarthritis of first carpometacarpal joint, unspecified

    2016 2017 2018 2019 2020 Billable/Specific Code
  • M18.9 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 M18.9 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of M18.9 - other international versions of ICD-10 M18.9 may differ.
The following code(s) above M18.9 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 M18.9:
  • 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
  • M15-M19
    2020 ICD-10-CM Range M15-M19

    Osteoarthritis

    Type 2 Excludes
    • osteoarthritis of spine (M47.-)
    Osteoarthritis
Approximate Synonyms
  • Arthritis of bilateral first carpometacarpal joints
  • Arthritis of first carpometacarpal joint of left hand
  • Arthritis of first carpometacarpal joint of right hand
  • Arthritis of left first wrist joint
  • Arthritis of right first wrist joint
ICD-10-CM M18.9 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 M18.9 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 M18.9:
  • Osteoarthritis M19.90
    ICD-10-CM Diagnosis Code M19.90

    Unspecified osteoarthritis, unspecified site

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Arthrosis NOS
    • Arthritis NOS
    • Osteoarthritis NOS
    • hand joint M19.04-
      ICD-10-CM Diagnosis Code M19.04-

      Primary osteoarthritis, hand

        2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
      Type 2 Excludes
      • primary osteoarthritis of first carpometacarpal joint (M18.0-, M18.1-)
      • first carpometacarpal joint M18.9

ICD-10-CM Codes Adjacent To M18.9
M18.2 Bilateral post-traumatic osteoarthritis of first carpometacarpal joints
M18.3 Unilateral post-traumatic osteoarthritis of first carpometacarpal joint
M18.30 …… unspecified hand
M18.31 …… right hand
M18.32 …… left hand
M18.4 Other bilateral secondary osteoarthritis of first carpometacarpal joints
M18.5 Other unilateral secondary osteoarthritis of first carpometacarpal joint
M18.50 …… unspecified hand
M18.51 …… right hand
M18.52 …… left hand
M18.9 Osteoarthritis of first carpometacarpal joint, unspecified
M19 Other and unspecified osteoarthritis
M19.0 Primary osteoarthritis of other joints
M19.01 Primary osteoarthritis, shoulder
M19.011 Primary osteoarthritis, right shoulder
M19.012 Primary osteoarthritis, left shoulder
M19.019 Primary osteoarthritis, unspecified shoulder
M19.02 Primary osteoarthritis, elbow
M19.021 Primary osteoarthritis, right elbow
M19.022 Primary osteoarthritis, left elbow
M19.029 Primary osteoarthritis, unspecified elbow

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