R22.4 Localized swelling, mass and lump, lower limb

ICD-10-CM R22.4: Localized swelling, mass and lump, lower limb

ICD-10-CM code R22.4 designates a diagnostic finding of localized swelling, mass, and lump in the lower limb. It is an active terminology concept within the 2026 ICD-10-CM system. This code represents a clinical finding rather than a specific disease etiology, and clinical sources note that lower limb swelling often requires multifactorial diagnostic evaluation. 1 2

Plain-language overview

Code R22.4 identifies a localized physical finding of swelling, mass, or lump specifically located in a lower limb, rather than naming a distinct underlying disease or illness. 1

What this code represents

The terminology record classifies R22.4 with the semantic type of finding and establishes it as an active concept in the 2026 version of ICD-10-CM without listing any narrower subordinate concepts. 1

Coding details

Within the code hierarchy, R22.4 is a direct child of the parent concept R22, which broadly covers localized swelling, mass, and lump of skin and subcutaneous tissue. 1

Clinical context

Clinical literature indicates that lower limb swelling is a challenging diagnostic problem that is frequently multifactorial, and patients are often referred to vascular specialists for evaluation. 2

Lower limb swelling may present asymptomatically or with associated symptoms like aching, pain, heaviness, skin changes, or ulcerations, and patients may experience sudden or gradual onset. 2

Documentation considerations

Because the etiology of lower limb swelling is often multifactorial, clinical evaluation may involve a thorough pulse exam and various diagnostic modalities to identify the specific cause. 2

Coverage and utilization context

A Medicare billing and coding article for peripheral venous ultrasound provides billing and coding guidance for localized swelling, mass, and lump, but the supplied excerpt does not specify coverage parameters. 3

What the sources add

While the official terminology record defines the code boundaries, clinical literature provides operational context by describing the practical diagnostic approaches and physical presentations of lower limb swelling. 1 2

Sources

1. ICD-10-CM R22.4 terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Diagnostic approach to lower limb edema — pmc.ncbi.nlm.nih.gov; accessed 2026-07-27.
3. Article - Billing and Coding: Peripheral Venous Ultrasound (A52993) — cms.gov; accessed 2026-07-27.
4. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-27.