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M02.86

Other reactive arthropathies, knee

Not billable — category only FY2026 2025-10-01 → 2026-09-30
Exclusions 18 never code together
M02code
Excludes1
  • Behçet's disease (M35.2)M35.2
  • direct infections of joint in infectious and parasitic diseases classified elsewhere (M01.-)M01.-
  • postmeningococcal arthritis (A39.84)A39.84
  • mumps arthritis (B26.85)B26.85
  • rubella arthritis (B06.82)B06.82
  • syphilis arthritis (late) (A52.77)A52.77
  • rheumatic fever (I00)I00
  • tabetic arthropathy [Charcôt's] (A52.16)A52.16
M00-M99chapter
Excludes2
  • arthropathic psoriasis (L40.5-)L40.5-
  • certain conditions originating in the perinatal period (P04-P96)P04-P96
  • certain infectious and parasitic diseases (A00-B99)A00-B99
  • compartment syndrome (traumatic) (T79.A-)T79.A-
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)O00-O9A
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Q00-Q99
  • endocrine, nutritional and metabolic diseases (E00-E88)E00-E88
  • injury, poisoning and certain other consequences of external causes (S00-T88)S00-T88
  • neoplasms (C00-D49)C00-D49
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)R00-R94

Excludes1 — never code together. The excluded condition and this one are mutually exclusive.

Excludes2 — not included here, but the patient may have both. Code both when documented.

Instructional notes 7
M02code
Code first
  • underlying disease, such as:
  • congenital syphilis [Clutton's joints] (A50.5)A50.5
  • enteritis due to Yersinia enterocolitica (A04.6)A04.6
  • infective endocarditis (I33.0)I33.0
  • viral hepatitis (B15-B19)B15-B19
M00-M25block
Includes
  • Disorders affecting predominantly peripheral (limb) joints
M00-M99chapter
Notes
  • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition
Index entries leading here 1
Alongside this code 9 same parent — M02.8
M02.80 Other reactive arthropathies, unspecified site M02.81 Other reactive arthropathies, shoulder category M02.82 Other reactive arthropathies, elbow category M02.83 Other reactive arthropathies, wrist category M02.84 Other reactive arthropathies, hand category M02.85 Other reactive arthropathies, hip category M02.87 Other reactive arthropathies, ankle and foot category M02.88 Other reactive arthropathies, vertebrae M02.89 Other reactive arthropathies, multiple sites
Subordinate codes 3
M02.861 Other reactive arthropathies, right knee M02.862 Other reactive arthropathies, left knee M02.869 Other reactive arthropathies, unspecified knee
Additional references
AHA Coding Clinic® Licence required

Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.

Risk adjustment

Maps to no condition category in any loaded model.

Presence is a property of the code. Untick a model to hide it everywhere.

This code

Billable
no
Code set
FY2026
Parent
M02.8
Block
M00-M25
Siblings
9
Subordinate
3

Present FY2024–FY2027.