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  2. ICD-10-CM Codes List
  3. M00–M99
  4. M20-M25
  5. Disorder of patella (M22)

Disorder of patella (M22)

The ICD-10 codes under M22 cover various disorders of the patella, the kneecap bone. These codes are specifically used for documenting conditions ranging from recurrent dislocation and subluxation to patellofemoral disorders and chondromalacia patellae, classified by the affected knee.

The section includes codes such as M22.0 for recurrent dislocation of the patella and M22.1 for recurrent subluxation, which are conditions where the kneecap partially or fully moves out of place, sometimes described as "recurrent dislocation of knee" or "recurrent subluxation of the patella." Patellofemoral disorders (M22.2); also known as patellofemoral syndrome or pain around the kneecap; are coded with options specifying the right, left, or unspecified knee. Other codes address different patellar issues, including chondromalacia patellae (M22.4), a degenerative softening of cartilage often called "chondromalacia of patella." The codes also encompass other derangements and unspecified disorders, which include maltracking or congenital anomalies like patella alta. These codes help ensure precise classification of kneecap conditions, facilitating accurate diagnosis and treatment documentation in clinical and billing practices.

Instructional Notations

Type 2 Excludes

A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.

  • traumatic dislocation of patella S83.0

Clinical Terms

The following clinical terms provide additional context, helping users better understand the clinical background and common associations for each diagnosis listed in this section. Including related terms alongside ICD-10-CM codes supports coders, billers, and healthcare professionals in improving accuracy, enhancing documentation, and facilitating research or patient education.

Chondromalacia Patellae

A degeneration of the ARTICULAR CARTILAGE of the PATELLA, caused by a decrease in sulfated MUCOPOLYSACCHARIDES in the ground substance. When accompanied by pain, it is sometimes considered part of or confused with PATELLOFEMORAL PAIN SYNDROME.