ICD-10 Coding Principles for Audiology
Audiology ICD-10 coding requires specificity in two dimensions that general medical coding often overlooks: type of hearing loss (conductive, sensorineural, or mixed) and laterality (right, left, bilateral, or unspecified). Reporting H91.90 (unspecified hearing loss, unspecified ear) when the audiogram clearly shows bilateral sensorineural hearing loss is both a missed coding opportunity and a potential denial trigger. Payers increasingly reject claims with unspecified codes when the clinical data supports a specific diagnosis. Every audiology claim should use the most specific code that the test results support.
Hearing Loss Codes: H90 (Conductive and Sensorineural)
The H90 category covers hearing loss with known type. Conductive hearing loss: H90.0 (bilateral), H90.11 (right ear), H90.12 (left ear). Sensorineural hearing loss: H90.3 (bilateral), H90.41 (right ear), H90.42 (left ear). Mixed conductive and sensorineural hearing loss: H90.6 (bilateral), H90.71 (right ear), H90.72 (left ear). These codes require the audiologist to classify both the type and the laterality based on test results.
Sensorineural hearing loss (H90.3, H90.41, H90.42) accounts for approximately 90% of adult hearing loss and is the most commonly used primary diagnosis in audiology. When the audiogram shows asymmetric sensorineural loss, code the worse ear as the primary diagnosis and consider whether the asymmetry warrants ABR testing to rule out retrocochlear pathology. An asymmetry of 15 dB or more across two or more frequencies supports medical necessity for ABR.
Other Hearing Loss: H91
The H91 category covers hearing loss types not classified under H90. Ototoxic hearing loss: H91.01 (right), H91.02 (left), H91.03 (bilateral). This code applies when hearing loss results from medication exposure (aminoglycosides, cisplatin, loop diuretics). Presbycusis (age-related hearing loss): H91.10 (unspecified ear), H91.11 (right), H91.12 (left), H91.13 (bilateral). Sudden idiopathic hearing loss: H91.20 (unspecified), H91.21 (right), H91.22 (left). Noise-induced hearing loss: H83.3x with laterality.
Sudden hearing loss (H91.2x) is a medical emergency that typically presents with unilateral hearing loss developing over hours to days. This diagnosis code supports urgent audiometric testing, ABR, and follow-up audiometry within 2 to 4 weeks, all of which are medically necessary and billable even if the testing falls within a frequency limitation window. Document the onset date and acuity of the hearing change.
Tinnitus: H93.1
Tinnitus codes include H93.11 (right ear), H93.12 (left ear), H93.13 (bilateral), and H93.19 (unspecified ear). Tinnitus is the second most common reason for audiology referral after hearing loss and supports diagnostic audiometric testing. When a patient presents with both hearing loss and tinnitus, list the hearing loss as the primary diagnosis and tinnitus as secondary because payers are more likely to cover diagnostic testing linked to hearing loss than tinnitus alone.
For patients presenting with tinnitus without measurable hearing loss, H93.1x as the primary diagnosis still supports audiometric testing because the evaluation is needed to rule out hearing loss and assess whether the tinnitus has an underlying cause requiring medical intervention. Document that the audiometric evaluation was performed to assess the etiology and severity of the tinnitus complaint.
Vestibular and Balance Codes: H81
Meniere disease: H81.01 (right), H81.02 (left), H81.03 (bilateral), H81.09 (unspecified). Benign paroxysmal positional vertigo (BPPV): H81.10 (right), H81.11 (left), H81.12 (bilateral), H81.13 (unspecified). Vestibular neuronitis: H81.20 (unspecified), H81.21 (right), H81.22 (left), H81.23 (bilateral). Other peripheral vertigo: H81.39x. These diagnosis codes support both audiometric and vestibular testing because many vestibular conditions have an auditory component.
Meniere disease (H81.0x) is particularly relevant to audiology billing because it involves fluctuating hearing loss, tinnitus, and episodic vertigo. Patients with Meniere disease often require serial audiometric testing to monitor hearing fluctuation, and each evaluation is medically necessary even when testing is performed more frequently than the payer standard frequency limit. Document the Meniere diagnosis and the reason for repeat testing (monitoring hearing fluctuation, assessing response to treatment).
Otitis Media and Ear Conditions: H66 and H65
Suppurative otitis media: H66.001 (right), H66.002 (left), H66.003 (bilateral). Nonsuppurative otitis media (serous): H65.01 (right), H65.02 (left), H65.03 (bilateral). Chronic serous otitis media: H65.20 (unspecified), H65.21 (right), H65.22 (left), H65.23 (bilateral). These codes support tympanometry (92567) and audiometric testing to assess the conductive component of hearing loss caused by middle ear pathology.
When coding for a patient with both otitis media and hearing loss, the hearing loss type should reflect the expected pathology. Otitis media typically causes conductive hearing loss (H90.0x, H90.1x), not sensorineural loss. If audiometry reveals sensorineural components in a patient with active middle ear disease, both the conductive (from otitis) and sensorineural components should be coded, potentially using the mixed hearing loss codes (H90.6, H90.7x).