H49.1
Non-billableFourth [trochlear] nerve palsy
Fourth [trochlear] nerve palsy
This is a header/category code. For billing purposes, use a more specific child code from the list below.
Coding Notes
Excludes 2
Conditions not included here, but the patient may have both
- •certain conditions originating in the perinatal periodP04-P96
- •certain infectious and parasitic diseasesA00-B99
- •complications of pregnancy, childbirth and the puerperiumO9A)O00
- •congenital malformations, deformations, and chromosomal abnormalitiesQ00-Q99
- •diabetes mellitus related eye conditions, , ,E09.3, E10.3, E11.3, E13.3
- •endocrine, nutritional and metabolic diseasesE00-E88
- •injury (trauma) of eye and orbitS05
- •injury, poisoning and certain other consequences of external causesS00-T88
- •neoplasmsC00-D49
- •symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classifiedR00-R94
- •syphilis related eye disorders, , ,A50.01, A50.3, A51.43, A52.71
- •nystagmus and other irregular eye movementsH55
- •internal ophthalmoplegiaH52.51
- •internuclear ophthalmoplegiaH51.2
- •progressive supranuclear ophthalmoplegiaG23.1
Child Codes (4)
Related Codes(6)
ICD-11 Equivalents(1)
ICD-11 Equivalents
View full mappingCorresponding ICD-11 codes from the WHO crosswalk mapping
Also Known As / Clinical Terms(38)
UMLS
- 4th nerve palsyC0271375
- Cranial Nerve IV PalsyC0271375
- Fourth Cranial Nerve PalsyC0271375
- Fourth Nerve PalsiesC0271375
- Fourth Nerve PalsyC0271375
- Fourth [trochlear] nerve palsyC0271375
- Fourth cranial nerve palsyC0271375
- Fourth cranial nerve paralysisC0271375
- Fourth cranial nerve paresisC0271375
- Fourth nerve palsyC0271375
- Fourth nerve palsy (disorder)C0271375
- Fourth nerve paralysisC0271375
- Fourth nerve paresisC0271375
- IV nerve palsyC0271375
- IVth nerve palsyC0271375
- IVth nerve paralysisC0271375
- IVth nerve paresisC0271375
- Palsies, Fourth NerveC0271375
- Palsies, Trochlear NerveC0271375
- Palsy, Fourth NerveC0271375
- Palsy, Trochlear NerveC0271375
- Paresis of fourth cranial nerveC0271375
- Superior oblique palsyC0271375
- Trochlear Nerve PalsiesC0271375
- Trochlear Nerve PalsyC0271375
- Trochlear Nerve ParalysisC0271375
- Trochlear nerve palsyC0271375
- Trochlear nerve paralysisC0271375
- Trochlear nerve weaknessC0271375
- fourth cranial nerve palsyC0271375
- fourth nerve cranial palsyC0271375
- fourth nerve palsyC0271375
- iv nerve palsyC0271375
- ivth nerve palsyC0271375
- nerve iv palsyC0271375
- nerve palsies trochlearC0271375
- superior oblique palsyC0271375
- trochlear nerve palsyC0271375
Frequently Asked Questions
What is the ICD-10 code for fourth [trochlear] nerve palsy?
The ICD-10-CM code for fourth [trochlear] nerve palsy is H49.1. The full clinical description is "Fourth [trochlear] nerve palsy". H49.1 is a non-billable header code. Use a more specific child code for billing purposes.
What does ICD-10 code H49.1 mean?
ICD-10-CM code H49.1 represents “Fourth [trochlear] nerve palsy”. It is classified under Chapter 7: Diseases of the Eye and Adnexa and is a non-billable header code. Use a more specific child code for billing purposes.
Is H49.1 a billable code?
No, H49.1 is a non-billable header code. You need to use one of its more specific child codes for billing. There are 4 child codes under H49.1.
What chapter is H49.1 in?
H49.1 is in Chapter 7: Diseases of the Eye and Adnexa (codes H00-H59).
What are the subcategories under H49.1?
H49.1 has 4 child codes, including: H49.10 (Fourth [trochlear] nerve palsy, unspecified eye), H49.11 (Fourth [trochlear] nerve palsy, right eye), H49.12 (Fourth [trochlear] nerve palsy, left eye), H49.13 (Fourth [trochlear] nerve palsy, bilateral).
What are the UMLS CUIs for H49.1?
H49.1 is linked to 1 UMLS Concept Unique Identifier: C0271375. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does H49.1 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like fourth [trochlear] nerve palsy affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of H49.1?
H49.1 maps to the ICD-11 code: 9C81.1 (Fourth nerve palsy).
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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.