Telangiectasia (plural: telangiectasias or telangiectases) refers to the focal dilation of small superficial blood vessels — capillaries, arterioles, or venules — measuring between 0.5 and 1 millimeter in diameter, creating visible red, purple, or blue markings on the skin or mucous membrane surfaces. These lesions arise when the walls of the smallest blood vessels permanently weaken and dilate, allowing them to become visible through overlying tissue. Telangiectasias are not blood vessel tumors — they are structurally malformed or permanently dilated normal vessels and do not grow or metastasize. They can be primary (idiopathic or hereditary) or secondary to an underlying condition such as rosacea, scleroderma, radiation damage, chronic corticosteroid use, liver disease, or pregnancy. The clinical significance ranges from purely cosmetic (isolated spider veins of the lower extremities) to life-threatening hemorrhagic disease — as in Hereditary Hemorrhagic Telangiectasia (HHT), also known as Osler-Weber-Rendu disease, in which AVMs in the lungs, brain, and GI tract cause recurrent severe hemorrhage. As an inpatient profee coder, telangiectasia appears most commonly as a secondary diagnosis in dermatology, hepatology (spider angiomas = hepatic telangiectasias), and rheumatology (CREST syndrome) admissions; the big-ticket inpatient code is I78.0 (hereditary hemorrhagic telangiectasia), which carries CC/MCC implications depending on associated hemorrhagic manifestations documented.
Ancient Greek ἔκτασις (éktasis), from ἐκ (ek, “out”) + τάσις (tásis, “stretching, tension”)
“A stretching out, extension, dilation” — from the PIE root *ten- (“to stretch”), the same root giving us tension, tendon, and tone
The term telangiectasia entered Modern Latin medical vocabulary in 1831, coined from three Greek components meaning, together, “a stretching out of the end vessels.” The etymological root *ten- (“to stretch”) is ancient and broad — it connects telangiectasia linguistically to hypoTONY, tendon, tonic, and tension. The related suffix -ectasia independently names other dilatory conditions throughout medicine: bronchiectasia (dilated airways), lymphangiectasia (dilated lymph vessels), and rhinophyma-associated nasal telangiectasias. The term first appeared in formal anatomical literature in the 1830s and remains unchanged in modern clinical use.
🔀 ALIASES / ALTERNATE TERMS
Telangiectasis(singular alternate form; both telangiectasia and telangiectasis are correct)
Telangiectases(classical plural form)
Spider veins(common lay/clinical term for superficial telangiectasias of the lower extremity)
Spider angioma / Spider nevus(central arteriolar telangiectasia with radiating branches; associated with liver disease and pregnancy)
Broken capillaries(lay term for facial telangiectasias)
Vascular ectasia(broader term covering all vessel dilations)
HHT(Hereditary Hemorrhagic Telangiectasia — the systemic genetic form)
Osler-Weber-Rendu disease / syndrome(eponym for HHT)
Rendu-Osler-Weber disease(alternate eponym order — all three physicians described the syndrome independently)
CREST syndrome telangiectasias(T in CREST = telangiectasia; part of limited cutaneous systemic sclerosis)
Mat telangiectasias(flat, blotchy type seen in CREST/scleroderma)
Venulectasia(dilation involving venules specifically — vessels appear blue rather than red)
Generalized essential telangiectasia(idiopathic; widespread without underlying disease)
🔗 RELATED TERMS
Hereditary hemorrhagic telangiectasia (HHT) — autosomal dominant disorder (mutations in ENG or ACVRL1 genes); AVMs in lungs, brain, liver, GI tract; recurrent epistaxis is hallmark
Arteriovenous malformation (AVM) — abnormal direct artery-to-vein connection without intervening capillary bed; telangiectasias are the smallest form of AVM
Rosacea — chronic inflammatory skin condition; facial telangiectasias are a cardinal feature (subtype: erythematotelangiectatic rosacea)
Spider angioma — central arteriole with radiating capillary branches; blanches with pressure; >5 in adults = sign of hyperestrogenism (liver disease, pregnancy, OCP use)
Liver disease / cirrhosis — spider angiomas result from elevated estrogen levels from impaired hepatic metabolism
Radiation telangiectasia — permanent vascular damage from ionizing radiation; appears years post-treatment in the radiation field
EGD with ablation of tumor(s), polyp(s), or other lesion(s) (APC ablation for GAVE/gastric telangiectasias)
⚠️ Coding Note:36468 is the correct CPT for spider vein / telangiectasia sclerotherapy — 36470/36471 explicitly exclude telangiectasia and apply to larger incompetent veins only; mixing these up is a frequent and auditable error on vascular claims. For HHT (I78.0), always look for documented organ involvement (pulmonary AVM, cerebral AVM, hepatic AVM, GI hemorrhage) and code those manifestations additionally — HHT on its own is not an MCC, but the hemorrhagic and AVM complications absolutely can be. Ataxia-telangiectasia (G11.3) is a completely separate disease from HHT despite the shared term — the underlying mechanism (DNA repair defect vs. vascular dysplasia) and ICD-10 chapter are both different; never conflate the two. GAVE (K31.811/K31.819) is a form of gastric vascular ectasia — essentially telangiectasias of the gastric mucosa — and is commonly undercoded on GI bleeding admissions; always query the gastroenterologist if the endoscopy report describes “watermelon stomach” or “gastric antral vascular ectasia.” For profee claims, laser destruction codes 17106-17108 are commonly used in dermatology for facial telangiectasias — confirm the sq cm treated is documented in the procedure note, as the code selection is size-dependent.
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