M79.662 – Pain in left lower leg

Learn about the ICD-10-CM code M79.662, used to diagnose pain in the left lower leg, it's billability, synonyms, and related codes.

By Karina Jimenea on Aug 8, 2025.

Fact Checked by Gale Alagos.

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M79.662 - Pain in left lower leg

M79.662 is an ICD code included in the International Classification of Diseases, Tenth Revision, Clinical Modification (or ICD-10-CM for short), and it designates “pain in left lower leg.” This code falls under the range of "diseases of the musculoskeletal system and connective tissue" (M00–M99), specifically within the category "other and unspecified soft tissue disorders, not elsewhere classified" (M79–).

The ICD code designation means the patient is dealing with pain in the left lower leg, which can be acute or chronic. Acute pain is a type of pain that suddenly emerges due to injury, inflammation, or disease. Acute pain can be diagnosed and usually goes away after a short while, especially if a patient undergoes treatment. On the other hand, chronic pain is a type of pain that lasts for a long time. It may even result in unfavorable outcomes if left unchecked.

Is the M79.662 billable?

Yes, the M79.662 ICD code is billable and can be used to designate a diagnosis for reimbursement purposes.

M79.662 clinical information

The M79.662 designation is just a general diagnosis. “Pain in the left lower leg” could refer to several problems that the patient might be dealing with, but it doesn't specify any specifics other than the general location of the pain.

Pain in the left lower leg can result from overuse, leading to muscle strain, or from conditions like arthritis or an injury. Another possible cause is deep vein thrombosis, a condition where a blood clot forms in a deep vein, usually in one leg, either left or right, which often causes pain in the affected leg. To get to the bottom of the pain, comprehensive tests need to be performed by a doctor or a medical team to make a specific diagnosis later on.

Pain in the left lower leg is often treated with pain relievers, muscle relaxants, anti-inflammation medicine, physical therapy or rehabilitation, and, for more severe cases, surgery. It's best to narrow things down through testing so you know what should be included in the treatment.

M79.662 synonyms include

Bilateral calf pain
Bilateral lower leg pain
Left calf pain
Left lower leg pain
Pain in bilateral lower legs
Pain of bilateral calves
Pain of left calf

Other ICD-10 codes used for leg pain

M79.66: Pain in lower leg
M79.661: Pain in right lower leg
M79.669: Pain in unspecified lower leg
M79.604: Pain in right leg
M79.605: Pain in left leg
M79.606: Pain in leg, unspecified
M79.60: Pain in limb, unspecified
M79.65: Pain in thigh
M79.651: Pain in right thigh
M79.652: Pain in left thigh
M79.659: Pain in unspecified thigh or unspecified thigh pain

Commonly asked questions

Yes, M79.662 is a billable ICD-10-CM code that can be used to specify a diagnosis of pain in the left lower leg for reimbursement purposes. It may also be grouped into a diagnostic-related group (DRG) for hospital billing and insurance classification.

M79.669 is the ICD-10-CM diagnosis code for pain in an unspecified lower leg or unspecified lower leg pain, used when the specific side is not documented.

M79.672 is the ICD-10-CM code for pain in the left foot, which indicates localized foot pain on the left side.

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