M79.669 – Pain in unspecified lower leg

Learn about M79.669 – Pain in unspecified lower leg, including diagnosis, billing status, clinical details, and synonyms.

By Karina Jimenea on Aug 8, 2025.

Fact Checked by Ericka Pingol.

Use Code

M79.669 diagnosis code: Pain in unspecified lower leg

M79.669 is a specific ICD-10-CM code used to specify a diagnosis.
It represents the condition of experiencing pain in the lower leg, but the precise location within the lower leg isn't defined.
The code can be utilized across various medical facilities, including private clinics, hospitals, and other healthcare institutions.
It is part of the broader M79 category, which represents "other and unspecified soft tissue disorders, not elsewhere classified."

Is M79.669 billable?

Yes, M79.669 is a billable code. It can be used to submit claims to insurance companies for reimbursement.

Clinical information

The code applies to lower leg pain, regardless of the cause. This diagnosis can encompass various medical conditions that result in lower leg pain, from minor strains to more severe circulatory conditions, which can give patients an unpleasant feeling.
Conditions that could potentially lead to this symptom include muscle strain, tendonitis, fractures, and peripheral artery disease.
Physicians must investigate the underlying cause for appropriate treatment further.
Medical professionals might order diagnostic tests, such as X-rays or MRIs, to find the source of the pain.
Treatment depends on the underlying cause, ranging from rest and physical therapy to medication and surgery.

Synonyms include

Lower limb pain
Pain in lower extremity
Leg discomfort
Lower leg ache
Pain in lower limb
Unspecified lower leg pain

Other ICD-10 codes related to lower leg pain

M25.561: Pain in right knee
M25.562: Pain in left knee
M25.551: Pain in right hip
M25.552: Pain in left hip
M79.6: Pain in limb, hand, foot, fingers, and toes
M79.604: Pain in right leg
M79.605: Pain in left leg

Commonly asked questions

The diagnosis code range M00–M99 in ICD-10-CM covers "diseases of the musculoskeletal system and connective tissue." This includes conditions affecting bones, joints, muscles, ligaments, and connective tissues, such as arthritis, back pain, and other soft tissue disorders.

The medical code M79.64 refers to "pain in hand and fingers" in the ICD-10-CM system.

M79.609 is the ICD-10-CM code for "pain in unspecified limb." It is used when a patient experiences limb pain but the specific location (such as arm or leg) is not identified in the documentation.

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