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H74.4 Tympanic Fibrosis – ICD-10 Code Explained
H74.4 is the ICD-10 code for tympanic fibrosis, a condition involving scar tissue formation in the middle ear that can permanently impair hearing.
Things worth knowing about "H74.4"
H74.4 is the ICD-10 code for tympanic fibrosis, a condition involving scar tissue formation in the middle ear that can permanently impair hearing.
What is ICD-10 Code H74.4?
The ICD-10 code H74.4 refers to tympanic fibrosis (also called tympanofibrosis). This condition is characterised by abnormal fibrous tissue formation (fibrosis) within the middle ear, particularly in the tympanic cavity and around the ossicles (the small bones responsible for transmitting sound). The resulting scar tissue can restrict the movement of the ossicles and lead to a conductive hearing loss.
Causes
Tympanic fibrosis typically develops as a consequence of inflammation or injury affecting the middle ear. Common causes include:
- Chronic middle ear infection (chronic otitis media)
- Recurrent acute middle ear infections
- Previous middle ear surgery
- Prolonged middle ear effusions (fluid behind the eardrum)
- Traumatic injury to the eardrum or tympanic cavity
Symptoms
The symptoms of tympanic fibrosis can vary depending on the extent of scarring. Typical complaints include:
- Conductive hearing loss: reduced hearing ability, particularly for low and mid-range frequencies
- A feeling of pressure or fullness in the ear
- Tinnitus (ringing or buzzing in the ear) in some cases
- Difficulty understanding speech, especially in noisy environments
Diagnosis
Tympanic fibrosis is diagnosed by an ear, nose and throat (ENT) specialist. The following examinations are typically used:
- Otoscopy: visual inspection of the ear canal and eardrum
- Tympanometry: measurement of the mobility of the eardrum and middle ear structures
- Pure-tone audiometry: assessment of hearing ability across different frequencies
- Computed tomography (CT) of the temporal bone: imaging of the middle ear structures in unclear cases
Treatment
Treatment of tympanic fibrosis depends on the severity of hearing impairment and the individual symptoms of the patient.
Conservative Treatment
In cases of mild hearing loss, a hearing aid may be the first-line option to compensate for the reduction in hearing ability.
Surgical Treatment
In more severe cases, surgical intervention may be appropriate:
- Tympanoplasty: surgical reconstruction of the eardrum and middle ear structures
- Ossiculoplasty: restoration of the ossicular chain when it is disrupted or immobilised by scar tissue
- Surgical removal of fibrous scar tissue from the tympanic cavity
The success of surgery depends largely on the extent of fibrosis and the condition of the remaining middle ear structures.
References
- World Health Organization (WHO): International Statistical Classification of Diseases and Related Health Problems, 10th Revision (ICD-10). Available at: https://www.who.int/classifications/icd/en/
- Gleeson M. et al. (eds.): Scott-Brown's Otorhinolaryngology, Head and Neck Surgery. 8th Edition, CRC Press, 2018.
- Merchant S.N., Nadol J.B. (eds.): Schuknecht's Pathology of the Ear. 3rd Edition, PMPH USA, 2010.
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