M22.8X Other disorders of patellaNon-billable header with 3 child codes.
M22.8X1 Other disorders of patella, right kneeM22.8X2 Other disorders of patella, left kneeM22.8X9 Other disorders of patella, unspecified kneeM22.4 Chondromalacia patellaeM22.40 Chondromalacia patellae, unspecified kneeM22.41 Chondromalacia patellae, right kneeM22.42 Chondromalacia patellae, left kneeM22.8 Other disorders of patellaM22.8X Other disorders of patella (this code)M22.8X1 Other disorders of patella, right kneeM22.8X2 Other disorders of patella, left kneeM22.8X9 Other disorders of patella, unspecified kneeM22.9 Unspecified disorder of patellaM22.90 Unspecified disorder of patella, unspecified knee