M22

Non-Billable

ChapterM00–M99

Rankcategory

Official Description

Disorder of patella

Metadata & Insights

•2026 ICD-10-CM Edition - Effective October 1, 2025.
•Non-billable category (requires more specific sub-code).
•Chapter 13: Diseases of the Musculoskeletal System and Connective Tissue (M00-M99).

CH13 Parent Instructions

Excludes2(Not included here)

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)

M20-M25 Parent Instructions

Excludes2(Not included here)

joints of the spine (M40-M54)

Instructional Notes

Excludes2(Not included here)

traumatic dislocation of patella (S83.0-)

Clinical Hierarchy

CH13Diseases of the musculoskeletal system and connective tissue (M00-M99)

M20-M25Other joint disorders (M20-M25)

M22Disorder of patella

M22.0Recurrent dislocation of patella

M22.1Recurrent subluxation of patella

M22.2Patellofemoral disorders

M22.3Other derangements of patella

M22.4Chondromalacia patellae

M22.8Other disorders of patella

M22.9Unspecified disorder of patella

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to M22:

blockM20-M25

Other joint disorders (M20-M25)

View context instructions

chapterCH13

Diseases of the musculoskeletal system and connective tissue (M00-M99)

View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to M22. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

9 raw paths

Chondromalacia (systemic)2 unique routes

knee

patella→M22

Dislocation (articular)2 unique routes

patella(2 variants)

recurrent (nontraumatic)→M22(2 variants)

incomplete→M22

Disorder (of)4 unique routes

patella→M22(3 variants)

derangement NEC→M22

specified NEC→M22