M79.604  – Pain in right leg

M79.604 – Pain in right leg

Know M79.604, an ICD-10-CM code denoting pain in the right leg. Understand its use in medical diagnosis, treatment, and healthcare documentation.

By Ericka Pingol on Jul 16, 2025.

Fact Checked by Karina Jimenea.

Use Code

M79.604 diagnosis code: Pain in right leg

The ICD-10 code M79.604 describes pain in the right leg. This diagnosis often falls under the broader category of soft tissue disorders, particularly when no specific underlying cause, such as fracture or infection, is identified. Patients may experience soft tissue pain related to muscles, tendons, ligaments, or connective tissue abnormalities. In some cases, the pain may be associated with unspecified soft tissue disorders, where symptoms are present but a definitive diagnosis is not yet established.

Pain in the right leg can present alongside other symptoms, such as bilateral leg pain or ischemic pain caused by reduced blood flow to the bilateral lower limbs. It can also occur with co-occurring conditions in the lower limbs, where disorders affect multiple areas, including the legs and, sometimes, other regions like the left forearm.

Management typically involves identifying the underlying cause and initiating appropriate treatments. Physical therapy is a cornerstone in the rehabilitation process, helping to improve function, reduce pain, and restore mobility in patients with soft tissue or connective tissue disorders affecting the legs.

Is M79.604 billable?

Yes, the ICD-10-CM code M79.604 is billable.

Clinical information

  • Leg pain is a frequent complaint encountered across a wide range of healthcare settings, from primary care to specialized musculoskeletal and vascular clinics. It can stem from various etiologies, including mechanical, vascular, neurological, and systemic causes. A careful clinical evaluation is essential to determine the underlying pathology and guide appropriate treatment.
  • Musculoskeletal causes are among the most common and include soft tissue disorders such as muscle strains, tendonitis, bursitis, and injuries to connective tissue structures. Overuse, trauma, or degenerative conditions like osteoarthritis can also contribute. Patients may report localized pain, stiffness, swelling, or functional impairment.
  • In some cases, the pain can be part of a lower limb co-occurring condition, such as pain affecting both legs (bilateral leg pain) or associated with discomfort in other areas, like the left forearm, in systemic conditions.
  • Vascular causes involve compromised blood flow, leading to ischemia pain. Peripheral artery disease (PAD) is a key consideration, especially if the pain worsens with activity (claudication) and is relieved with rest. Advanced ischemia can cause pain at rest and may be associated with coldness, pallor, or ulcerations in the bilateral lower limbs.
  • Neurological causes such as lumbar radiculopathy (sciatica), peripheral neuropathy, or spinal stenosis can present with radiating leg pain, numbness, tingling, or weakness. A thorough neurological examination is critical to distinguish between musculoskeletal and neurogenic sources of pain.
  • Systemic causes like autoimmune diseases (e.g., lupus, rheumatoid arthritis) can lead to unspecified soft tissue disorders, where inflammation affects muscles and joints, causing diffuse or migrating pain.
  • To ensure diagnostic accuracy, healthcare providers aim for an exact match between the patient's clinical presentation and potential musculoskeletal or systemic disorders. This often involves detailed history-taking, physical examination, and appropriate imaging or vascular studies.

Synonyms include

  • Right leg discomfort
  • Right leg ache
  • Pain in right lower limb
  • Right leg pain, unspecified
  • Unspecified right leg pain

Other ICD-10 codes commonly use for pain

Related ICDs

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