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ICD Hub / Diseases of the musculoskeletal system or connective tissue (M00–M99) / FA01.Z - Osteoarthritis of knee, unspecified
ICD-11

ICD-11 Codes
for FA01.Z - Osteoarthritis of knee, unspecified
Teodor Jurukovski January 1, 1970
Fact checked by: Teodor Jurukovski
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Causes and Risk Factors

While the specific cause for FA01.Z, Osteoarthritis of knee, unspecified, is not detailed, general risk factors for knee osteoarthritis include:
  • Age: The risk increases with age as cartilage naturally deteriorates.
  • Genetics: A family history of osteoarthritis can predispose individuals to the condition.
  • Obesity: Excess body weight places increased stress on the knee joints, accelerating cartilage wear.
  • Previous Knee Injury: Past trauma, such as ligament tears or fractures, can lead to osteoarthritis later in life.
  • Occupation/Activities: Repetitive stress on the knees from certain jobs or high-impact sports can contribute.

Clinical Overview

Osteoarthritis of the knee, identified by the ICD-11 code FA01.Z, refers to a degenerative joint condition affecting the knee where the protective cartilage that cushions the ends of the bones gradually wears down. This unspecified form indicates that the specific type or cause of the osteoarthritis is not detailed in the documentation. It is a common ailment, particularly in older adults, leading to pain and reduced mobility in the knee joint. This condition is also known as knee OA, unspecified.

Documentation and Coding Considerations

The ICD-11 code FA01.Z is used to report unspecified osteoarthritis of the knee. This code is appropriate when clinical documentation indicates osteoarthritis affecting the knee, but does not specify the type (e.g., primary, secondary, post-traumatic) or laterality (e.g., right, left, bilateral). Accurate documentation is crucial for correct coding. When more specific information is available, such as primary osteoarthritis of the right knee, a more precise ICD-11 code should be used. FA01.Z serves as a general code for knee osteoarthritis when details are lacking. This ICD-11 code for unspecified knee osteoarthritis is reportable for diagnostic purposes.

How the Condition is Diagnosed

Diagnosing unspecified knee osteoarthritis typically involves a comprehensive approach:
  • Medical History: A healthcare provider will inquire about the patient's symptoms, their onset, and duration.
  • Physical Examination: This includes assessing the knee's range of motion, checking for swelling, tenderness, and listening for any grinding or clicking sounds.
  • Imaging Studies: X-rays are commonly used to visualise the knee joint, identify joint space narrowing, bone spurs (osteophytes), and other changes indicative of osteoarthritis. In some cases, MRI may be used for a more detailed view of cartilage and soft tissues.

Treatment and Management Considerations

Management of unspecified knee osteoarthritis aims to relieve pain, improve function, and slow disease progression. Treatment strategies may include:
  • Pain Management: Over-the-counter or prescription pain relievers, such as nonsteroidal anti-inflammatory drugs (NSAIDs).
  • Physical Therapy: Exercises to strengthen muscles around the knee, improve flexibility, and enhance joint stability.
  • Lifestyle Modifications: Weight management to reduce joint stress and activity modification to avoid aggravating movements.
  • Injections: Corticosteroid or hyaluronic acid injections may provide temporary relief.
  • Assistive Devices: Braces or walking aids can help support the knee.
  • Surgery: For severe cases, procedures like arthroscopy, osteotomy, or total knee replacement may be considered.

Common Symptoms and Presentation

Individuals experiencing unspecified knee osteoarthritis may present with a range of symptoms, including:
  • Persistent knee pain, often worsening with activity or after periods of rest.
  • Stiffness in the knee joint, particularly noticeable in the morning or after inactivity.
  • Swelling around the knee.
  • A reduced range of motion, making it difficult to bend or straighten the knee fully.
  • A grating sensation or audible clicking/popping sounds when moving the knee.

Frequently asked questions

What does ICD-11 code FA01.Z represent?
ICD-11 code FA01.Z represents unspecified osteoarthritis of the knee.
Under what circumstances is ICD-11 code FA01.Z used for knee osteoarthritis?
ICD-11 code FA01.Z is used when the clinical documentation for osteoarthritis of the knee does not specify its type.
How does ICD-11 code FA01.Z differ from other categories of knee osteoarthritis?
ICD-11 code FA01.Z is used when the specific type of osteoarthritis of the knee is not documented, whereas other codes specify types such as primary, post-traumatic, or other secondary osteoarthritis.
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