M79.66 (Pain in lower leg) is an umbrella ICD-10-CM medical diagnosis code in the Diseases of the musculoskeletal system and connective tissue chapter. It identifies cases of pain in lower leg for clinical documentation, billing and epidemiological tracking.

ICD-10-CM · Category

M79.66 — Pain in lower leg

Chapter M00-M99: Diseases of the musculoskeletal system and connective tissue

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Sub-codes under M79.66

M79.661Pain in right lower legM79.662Pain in left lower legM79.669Pain in unspecified lower leg

Related diagnoses

M79.60Pain in limb, unspecifiedM79.62Pain in upper armM79.63Pain in forearmM79.64Pain in hand and fingersM79.65Pain in thighM79.67Pain in foot and toes

Common questions about M79.66 (Pain in lower leg)

What does ICD-10 code M79.66 mean?
M79.66 is the ICD-10-CM 2025 code for Pain in lower leg. ICD-10-CM is the medical coding system used by clinicians, hospitals and insurers worldwide to classify diseases and conditions in a standard way.
Is M79.66 a billable diagnosis code?
M79.66 is a category-level (umbrella) code rather than a billable specific code. For billing purposes, clinicians typically use a more specific sub-code under M79.66. Browse the sub-codes listed on this page.
Which ICD-10 chapter does M79.66 belong to?
M79.66 belongs to the chapter "Diseases of the musculoskeletal system and connective tissue" (codes M00-M99). ICD-10-CM organises codes into 22 chapters by body system or condition type, which helps clinicians navigate related diagnoses.
Where can I get plain-language information about Pain in lower leg?
For a plain-language explanation of Pain in lower leg, ask GoDavaii's Health AI - it explains medical conditions in 22+ Indian languages, free, with no signup. Tap "Ask GoDavaii AI about Pain in lower leg" above to get a personalised answer.

Source: ICD-10-CM 2025 (Centers for Medicare & Medicaid Services, public domain). Codes valid from October 1, 2024. CMS source ↗