Other peripheral vascular diseases (I73)
The ICD-10 code I73 and its subcodes are used to classify a variety of peripheral vascular diseases that affect blood circulation outside the heart and brain. These include conditions like Raynaud's syndrome (I73.0), thromboangiitis obliterans, and other less common vascular disorders.
This group addresses specific issues such as Raynaud's syndrome without gangrene (I73.00), also called Raynaud's phenomenon or Raynaud's disease, which involves blood vessel spasms often triggered by autoimmune causes, trauma, or occupational exposure. When gangrene develops as a complication, the code changes to I73.01. Thromboangiitis obliterans (Buerger's disease) is coded under I73.1 and describes a rare inflammatory vascular condition mostly linked to tobacco use. Other specified peripheral vascular diseases and symptoms like erythromelalgia (I73.81), characterized by burning pain and redness in extremities, are included as well. The I73.9 code covers unspecified peripheral vascular disease and related complications such as poor circulation, claudication, and vascular insufficiency. These codes help healthcare professionals accurately identify and document complex peripheral vascular problems for diagnosis and treatment planning.
Diseases of the circulatory system (I00–I99)
Diseases of arteries, arterioles and capillaries (I70-I79)
I73 Other peripheral vascular diseases
I73.0 Raynaud's syndrome
- I73.00 Raynaud's syndrome without gangrene
- I73.01 Raynaud's syndrome with gangrene
- I73.1 Thromboangiitis obliterans [Buerger's disease]
I73.8 Other specified peripheral vascular diseases
- I73.81 Erythromelalgia
- I73.89 Other specified peripheral vascular diseases
- I73.9 Peripheral vascular disease, unspecified
Other peripheral vascular diseases (I73)
Instructional Notations
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Clinical Terms
The following clinical terms provide additional context, helping users better understand the clinical background and common associations for each diagnosis listed in this section. Including related terms alongside ICD-10-CM codes supports coders, billers, and healthcare professionals in improving accuracy, enhancing documentation, and facilitating research or patient education.
Erythema Induratum
A type of panniculitis characterized histologically by the presence of granulomas, vasculitis, and necrosis. It is traditionally considered to be the tuberculous counterpart of nodular vasculitis, but is now known to occur without tuberculous precedent. It is seen most commonly in adolescent and menopausal women, is initiated or exacerbated by cold weather, and typically presents as one or more recurrent erythrocyanotic nodules or plaques on the calves. The nodules may progress to form indurations, ulcerations, and scars.
Erythromelalgia
A peripheral arterial disease that is characterized by the triad of ERYTHEMA, burning PAIN, and increased SKIN TEMPERATURE of the extremities (or red, painful extremities). Erythromelalgia may be classified as primary or idiopathic, familial or non-familial. Secondary erythromelalgia is associated with other diseases, the most common being MYELOPROLIFERATIVE DISORDERS.
Intermittent Claudication
A symptom complex characterized by pain and weakness in SKELETAL MUSCLE group associated with exercise, such as leg pain and weakness brought on by walking. Such muscle limpness disappears after a brief rest and is often relates to arterial STENOSIS; muscle ISCHEMIA; and accumulation of LACTATE.
Peripheral Arterial Disease
Lack of perfusion in the EXTREMITIES resulting from atherosclerosis. It is characterized by INTERMITTENT CLAUDICATION, and an ANKLE BRACHIAL INDEX of 0.9 or less.
Peripheral Vascular Diseases
Pathological processes involving any one of the BLOOD VESSELS in the vasculature outside the HEART.
Thromboangiitis Obliterans
A non-atherosclerotic, inflammatory thrombotic disease that commonly involves small and medium-sized arteries or veins in the extremities. It is characterized by occlusive THROMBOSIS and FIBROSIS in the vascular wall leading to digital and limb ISCHEMIA and ulcerations. Thromboangiitis obliterans is highly associated with tobacco smoking.
