M66.18

Rupture of synovium, other site

Billable / specific

M66.18 is a billable, specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes in FY2027.

Inclusion terms

rupture that occurs when a normal force is applied to tissues that are inferred to have less than normal strength
Note: Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

Not included here — may be reported together when both conditions exist.

rupture of popliteal cyst (M66.0) (from M66.1)
arthropathic psoriasis (L40.5-) (from M66)
certain conditions originating in the perinatal period (P04-P96) (from M66)
certain infectious and parasitic diseases (A00-B99) (from M66)
compartment syndrome (traumatic) (T79.A-) (from M66)
complications of pregnancy, childbirth and the puerperium (O00-O9A) (from M66)
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99) (from M66)
endocrine, nutritional and metabolic diseases (E00-E88) (from M66)
injury, poisoning and certain other consequences of external causes (S00-T88) (from M66)
neoplasms (C00-D49) (from M66)
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94) (from M66)
rotator cuff syndrome (M75.1-) (from M66)
rupture where an abnormal force is applied to normal tissue - see injury of tendon by body region (from M66)