M22.40 Chondromalacia patellae, unspecified knee

Instructional Notes:

M22.40
Description: Chondromalacia patellae, unspecified knee
↓
M22.4
Description: Chondromalacia patellae
↓
M22
Description: Disorder of patella
Exclude2:
- traumatic dislocation of patella (S83.0-)
↓
M20-M25
Description: Other joint disorders (M20-M25)
Exclude2:
- joints of the spine (M40-M54)
↓
M00-M99
Description: Diseases of the musculoskeletal system and connective tissue
Exclude2:
- 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)
Notes:
- Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition