H49.1 is the ICD-10 code for Fourth [trochlear] nerve palsy. It is a four-character subcategory of H49 (Paralytic strabismus), the most specific level in the WHO edition. It belongs to the block H49–H52 (Disorders of ocular muscles, binocular movement, accommodation and refraction) in Chapter VII, Diseases of the eye and adnexa.
- Code type
- Subcategory (4 characters)
- Chapter
- VII · H00–H59
- Classification
- WHO ICD-10, 2019 version
H49.1 in national editions
Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.
H49.1Troklearispares
H49.1Lammelse av nervus trochlearis [4. hjernenerve]
DH491Troklearisparese
H49.1Telahermon (neljännen aivohermon) halvaus
H49.1Lähmung des N. trochlearis [IV. Hirnnerv]
H49.1Paralysie du nerf pathétique [IV]
H49.1verlamming van vierde hersenzenuw [n. trochlearis]
Listed through more specific codes:
- H49.10Fourth [trochlear] nerve palsy, unspecified eye
- H49.11Fourth [trochlear] nerve palsy, right eye
- H49.12Fourth [trochlear] nerve palsy, left eye
- H49.13Fourth [trochlear] nerve palsy, bilateral
Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.
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