F12-associated cold autoinflammatory…

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F12-associated cold autoinflammatory syndrome

ORPHA:617919Disease

Also called FACAS

What it is

A rare genetic autoinflammatory syndrome with skin involvement characterized by cold-induced urticarial rash without angioedema starting in infancy and systemic inflammation due to autosomal dominant mutations in the coagulation factor (12 (F-12) gene. In addition to cold-induced, non-pruritic urticarial rash, patients present with headache, mild to severe arthralgia, fatigue, subfebrile evening temperature, chills, and malaise. Systemic symptoms worsen during the cold season and over the years.

Key facts

Prevalence
<1 / 1 000 000
Age of onset
Neonatal
Inheritance
Autosomal dominant
Classified as
Disease

Prevalence figures describe populations, not individuals, and are often estimates from a single study. Where the figure is an incidence or a birth prevalence, it says so.

Gene

F12Disease-causing germline mutation(s)

ICD-10 codes

L50.2filed under a broader ICD-10 category — shared with 2 other rare diseases

ICD-10 has no distinct code for most rare diseases, so many are filed under the nearest available one. A shared code identifies the group, not this disease — the ORPHAcode above is what identifies it.

Related health topics

Reached through the ICD-10 categories this disease is filed under, so these describe the broader group rather than this disease specifically.

Benefit programs to look at

Programs whose eligibility touches the same ICD-10 categories. Eligibility is decided by the administering agency, never by this page.

Cross-references

MONDO 0850053UMLS C5681829

Orphadata Science: Free access data from Orphanet. © INSERM 1999. Data version 2026-06-23. Available under CC BY 4.0. This is a reference, not medical advice.

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