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H91.21

H91.21: Sudden idiopathic hearing loss, right ear

Billable / specific codeICD-10-CMright

H91.21 is a billable, specific ICD-10-CM code for sudden idiopathic hearing loss, right ear. It is valid for submission on a claim.

Check H91.21 with the rest of the claim: free scrubber

Excludes1 inherited from the categories above H91.21

A category’s note binds every code beneath it.

Written on H91: Other and unspecified hearing loss

  • abnormal auditory perception (H93.2-)
  • hearing loss as classified in H90.-
  • impacted cerumen (H61.2-)
  • noise-induced hearing loss (H83.3-)
  • psychogenic deafness (F44.6)
  • transient ischemic deafness (H93.01-)

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

H91.21 is named in 3 Medicare coverage policies: 3 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

  • A56773Billing and Coding: Neurophysiology Evoked Potentials (NEPs)
  • A57204Billing and Coding: MRI and CT Scans of the Head and Neck
  • A57434Billing and Coding: Vestibular and Audiologic Function Studies

Code history

Unchanged in every release from FY2024 to FY2027.

Other codes under H91.2

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.