2021

  1. ICD-10-CM Codes
    2. ›
  2. M00-M99 Diseases of the musculoskeletal system and connective tissue
    3. ›
  3. M65-M67 Disorders of synovium and tendon
    4. ›
  4. M65- Synovitis and tenosynovitis
    5. ›
  5. 2021 ICD-10-CM Diagnosis Code M65.9

2021 ICD-10-CM Diagnosis Code M65.9

Synovitis and tenosynovitis, unspecified

    2016 2017 2018 2019 2020 2021 Billable/Specific Code
  • M65.9 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 M65.9 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of M65.9 - other international versions of ICD-10 M65.9 may differ.
The following code(s) above M65.9 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 M65.9:
  • M00-M99
    2021 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
  • M65
    ICD-10-CM Diagnosis Code M65

    Synovitis and tenosynovitis

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • chronic crepitant synovitis of hand and wrist (M70.0-)
    • current injury - see injury of ligament or tendon by body region
    • soft tissue disorders related to use, overuse and pressure (M70.-)
    Synovitis and tenosynovitis
Approximate Synonyms
  • Relapsing seronegative symmetric synovitis with edema
  • Remitting seronegative symmetrical synovitis with pitting edema
  • Silastic synovitis
  • Silicone synovitis
  • Synovitis
  • Synovitis and tenosynovitis
  • Synovitis of bilateral ankle joints
  • Synovitis of bilateral foot joints
  • Synovitis of bilateral knee joints
  • Synovitis of joint of left knee
  • Synovitis of knee
  • Synovitis of left ankle joint
  • Synovitis of left foot joint
  • Synovitis of left knee joint
  • Synovitis of right ankle joint
  • Synovitis of right foot joint
  • Synovitis of right knee joint
  • Synovitis or tenosynovitis
  • Tenosynovitis
  • Tenosynovitis of bilateral ankles
  • Tenosynovitis of bilateral feet
  • Tenosynovitis of bilateral hands
  • Tenosynovitis of bilateral wrists
  • Tenosynovitis of left ankle
  • Tenosynovitis of left foot
  • Tenosynovitis of left hand
  • Tenosynovitis of left wrist
  • Tenosynovitis of right ankle
  • Tenosynovitis of right foot
  • Tenosynovitis of right hand
  • Tenosynovitis of right wrist
ICD-10-CM M65.9 is grouped within Diagnostic Related Group(s) (MS-DRG v38.0):
  • 557 Tendonitis, myositis and bursitis with mcc
  • 558 Tendonitis, myositis and bursitis without mcc

Convert M65.9 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
  • 2021 (effective 10/1/2020): No change

Diagnosis Index entries containing back-references to M65.9:

ICD-10-CM Codes Adjacent To M65.9
M65.86 Other synovitis and tenosynovitis, lower leg
M65.861 Other synovitis and tenosynovitis, right lower leg
M65.862 Other synovitis and tenosynovitis, left lower leg
M65.869 Other synovitis and tenosynovitis, unspecified lower leg
M65.87 Other synovitis and tenosynovitis, ankle and foot
M65.871 Other synovitis and tenosynovitis, right ankle and foot
M65.872 Other synovitis and tenosynovitis, left ankle and foot
M65.879 Other synovitis and tenosynovitis, unspecified ankle and foot
M65.88 …… other site
M65.89 …… multiple sites
M65.9 Synovitis and tenosynovitis, unspecified
M66 Spontaneous rupture of synovium and tendon
M66.0 Rupture of popliteal cyst
M66.1 Rupture of synovium
M66.10 …… unspecified joint
M66.11 Rupture of synovium, shoulder
M66.111 Rupture of synovium, right shoulder
M66.112 Rupture of synovium, left shoulder
M66.119 Rupture of synovium, unspecified shoulder
M66.12 Rupture of synovium, elbow
M66.121 Rupture of synovium, right elbow

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

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