M18.11
Unilateral primary osteoarthritis of first carpometacarpal joint, right hand
Clinical Classification Guidelines
Medical Intelligence & Overview
Unilateral primary osteoarthritis of the first carpometacarpal (CMC) joint, commonly known as basal thumb arthritis, is a degenerative joint condition affecting the joint at the base of the thumb on the right hand. This condition is characterized by the gradual deterioration of cartilage within the joint, leading to pain, stiffness, and reduced thumb function. It most commonly develops in older adults and can significantly impact daily activities that involve grip and pinching movements.
Causes & Symptoms
Clinical Causes: Aging process leading to cartilage wear and tear Genetic predisposition to joint degeneration Repetitive or overuse activities involving thumb movements Previous injuries or trauma to the thumb joint Joint instability or laxity in the thumb ligament structures Conditions like osteoarthritis that tend to affect specific joints genetically or due to biomechanical factors
Key Symptoms: Pain at the base of the thumb, especially during activity or grasping Tenderness when touching the affected joint Swelling or inflammation around the joint Stiffness, particularly in the morning or after periods of inactivity Reduced range of motion in the thumb Weakness in grip strength A sensation of grinding or catching during thumb movement Development of bony bumps or enlargements at the joint
Diagnostic & Treatment
Diagnosis Path: Diagnosis typically involves a combination of patient history, physical examination, and imaging studies. During the exam, a healthcare provider may check for tenderness, swelling, and joint instability, as well as assess grip and pinch strength. X-rays are commonly used to visualize joint space narrowing, subchondral sclerosis, osteophyte formation, and joint deformity, which are indicative of osteoarthritis in the first CMC joint.
Treatment Protocols: Management strategies aim to reduce pain and improve thumb function. Treatment options may include:
Clinical Advice & FAQs
Billing Guidance
Is M18.11 a billable ICD-10 code?
Yes, M18.11 is a specific, billable code that can be used to indicate a diagnosis for reimbursement purposes.
Documentation
How do I report M18.11?
Clinical documentation must specify the nature of Unilateral primary osteoarthritis of first carpometacarpal joint, right hand and any associated comorbidities for accurate reporting.
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