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ICD Hub / Diseases of the musculoskeletal system or connective tissue (M00–M99) / FA00.0 - Primary osteoarthritis of hip
ICD-11

ICD-11 Codes
for FA00.0 - Primary osteoarthritis of hip
Teodor Jurukovski January 1, 1970
Fact checked by: Teodor Jurukovski
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Understanding the Origins: Causes and Risk Factors for Hip Osteoarthritis

Primary osteoarthritis of the hip (ICD-11 code FA00.0) is a degenerative joint disease with an idiopathic origin, meaning its exact cause is often unknown. However, several factors are associated with its development. Age is a significant risk factor, as the condition typically appears in late middle or old age, reflecting wear and tear on the joint over time. Genetic predisposition may also play a role, with some individuals being more susceptible. Other contributing factors can include obesity, which places increased stress on the hip joint, and overuse from jobs or sports involving repetitive motions. While the precise etiology of primary hip OA remains under investigation, these elements are understood to increase an individual's likelihood of developing the condition.

What is Primary Osteoarthritis of the Hip (ICD-11 FA00.0)?

Primary osteoarthritis of the hip, identified by ICD-11 code FA00.0, is a non-inflammatory, degenerative condition affecting the hip joint. This disorder is characterised by the progressive breakdown of the articular cartilage that cushions the femoral head (the ball) and the acetabulum (the socket). As the cartilage erodes, the space between the bones narrows, leading to friction, pain, and stiffness. The process can also involve the formation of bone spurs (osteophytes) and changes in the subchondral bone. While it primarily affects the cartilage, the entire joint structure is involved in the osteoarthritic process.

Diagnosing Hip Osteoarthritis: The Diagnostic Process

The diagnosis of primary hip osteoarthritis typically begins with a thorough medical history, where a clinician will inquire about symptoms, lifestyle, and any known risk factors. This is followed by a focused physical examination of the hip joint to assess range of motion, tenderness, and any deformities. Imaging investigations are crucial for confirming the diagnosis and evaluating the extent of joint damage. Radiographs, such as anteroposterior hip X-rays, are commonly used to identify narrowing of the joint space, osteophyte formation, subchondral cysts, and changes in the femoral head and acetabulum. While other imaging modalities may be used in specific circumstances, X-rays are the primary tool for assessing the severity of osteoarthritis.

Recognising the Signs: Common Symptoms of Hip Osteoarthritis

The most prevalent symptom of primary hip osteoarthritis is pain, typically felt in the groin area, but it can also radiate to the outer thigh or buttock. This pain often worsens with movement, weight-bearing activities, or after periods of rest, such as upon waking in the morning. Stiffness in the hip joint is another common complaint, which can make everyday activities like bending, walking, or putting on shoes challenging. Patients may also experience a grinding, clicking, or snapping sensation (crepitus) when moving the hip. Over time, the reduced mobility due to pain can lead to weakness in the hip muscles.

Coding and Documentation for Primary Hip Osteoarthritis (FA00.0)

For accurate medical record-keeping and billing, the International Classification of Diseases, 11th Revision (ICD-11) provides specific codes. Primary osteoarthritis of the hip is officially classified under the ICD-11 code FA00.0. This code is used to denote the condition in clinical documentation, ensuring precise identification for healthcare providers, researchers, and administrative purposes. When documenting this condition, healthcare professionals should ensure the code FA00.0 is correctly applied, reflecting the diagnosis of primary hip osteoarthritis.

Managing Hip Osteoarthritis: Treatment and Care Strategies

Management of primary hip osteoarthritis focuses on alleviating pain, improving function, and slowing disease progression. Non-surgical approaches are often the first line of treatment and include activity modification to avoid aggravating movements, physical therapy to strengthen hip muscles and maintain mobility, and pain management with analgesics like acetaminophen or nonsteroidal anti-inflammatory drugs (NSAIDs). Injections, such as corticosteroids, may also be considered for symptom relief. When conservative measures are insufficient and quality of life is significantly impacted, surgical interventions like hip replacement surgery (arthroplasty) can provide substantial long-term relief and restoration of function.

Frequently asked questions

What is the ICD-11 classification meaning of FA00.0 Primary osteoarthritis of hip?
FA00.0 denotes a noninflammatory degenerative disease of the hip joint, typically appearing in late middle or old age, characterized by growth or maturational disturbances in the femoral neck and head, as well as acetabular changes.
How is FA00.0 Primary osteoarthritis of hip used in ICD-11 coding?
FA00.0 is used to specifically code primary osteoarthritis of the hip joint, distinguishing it from other types of hip osteoarthritis or osteoarthritis in different anatomical locations.
Can additional details be added to FA00.0 Primary osteoarthritis of hip in ICD-11?
Yes, FA00.0 can be post-coordinated with extension codes to specify laterality (e.g., bilateral, left, right) and manifestations such as chronic secondary musculoskeletal pain.
What differentiates FA00.0 Primary osteoarthritis of hip from other ICD-11 codes for hip osteoarthritis?
FA00.0 specifically identifies primary osteoarthritis of the hip, distinguishing it from post-traumatic osteoarthritis of the hip (FA00.1) or other secondary osteoarthritis of the hip (FA00.2).
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