What M22 covers · when clinicians use it
ICD-10 code M22 identifies Disorder of patella in the U.S. ICD-10-CM clinical and billing record set. It sits within the Musculoskeletal System chapter (M00–M99), the section that groups related diagnoses so providers, payers, and public-health agencies report them consistently. Clinicians and medical coders apply M22 when an encounter's findings match the Disorder of patella description, attaching it to the patient record so downstream insurance claims, payer audits, quality reporting, and epidemiological surveillance all reference the same standardized diagnosis. The ICD-10-CM is maintained by the Centers for Medicare & Medicaid Services and the CDC's National Center for Health Statistics, with an updated official code set released each U.S. fiscal year — always verify M22 against the current CMS/CDC release and your payer's documentation guidance before final use. This page summarizes documentation context for M22 and is a coding reference, not clinical, diagnostic, or billing advice.
M22 refers to Disorder of patella, which covers acquired deformities, mechanical derangements, and nonspecific joint disorders that may result from trauma, chronic instability, or degenerative changes over time.
Symptoms
- Joint instability – Often present in patellar disorders (M22) and knee derangements (M23)
- Visible deformity – Common in fingers, toes (M20), or limb malalignments (M21)
- Pain and swelling – Especially with joint movement or weight-bearing
- Locking or clicking – Characteristic of internal derangements like meniscal tears (M23)
- Restricted range of motion – Seen in various joint derangements (M24, M25)
Diagnosis
Diagnosis of Disorder of patella typically involves clinical examination, stress testing for joint laxity, radiography (X-rays), MRI for soft tissue assessment (menisci, ligaments), and sometimes functional movement evaluations.
ICD10 Code Usage
ICD10 code M22 is used by orthopedic surgeons, sports medicine specialists, podiatrists, physiotherapists, and rehabilitation teams for documenting joint deformities, mechanical issues, and chronic instability requiring bracing, therapy, or surgery.
Related Codes
- M20 – Acquired deformities of fingers and toes
- M21 – Other acquired deformities of limbs
- M23 – Internal derangement of knee
- M24 – Other specific joint derangements
- M25 – Other joint disorder, not elsewhere classified
FAQs
Q1: What is ICD10 code M22?
A: It refers to Disorder of patella, covering acquired deformities, instability, or nonspecific disorders affecting joint mechanics and alignment.
Q2: How does M23 differ from M24?
A: M23 focuses on internal derangements of the knee (like meniscus or ligament injuries), while M24 includes derangements in other joints.
Q3: What are examples of acquired deformities (M20, M21)?
A: Examples include bunions, hammertoes, knock knees, bow legs, and other acquired limb or digit misalignments.
Q4: What treatments are available?
A: Treatments range from physiotherapy, orthotics, joint injections, bracing, to surgical realignment or repair procedures.
Q5: Who typically manages these conditions?
A: Orthopedic surgeons, sports medicine doctors, podiatrists (for toes), and physiotherapists.
Conclusion
ICD10 code M22 plays a crucial role in accurately diagnosing and treating Disorder of patella, allowing for timely interventions that can restore function, reduce pain, and prevent further joint deterioration.