Parosmia

This code represents parosmia, a qualitative olfactory dysfunction characterized by a distorted perception of odors. Patients often describe familiar smells as unpleasant, foul, or chemically altered, rather than absent or reduced. It is a distinct condition from anosmia or hyposmia, which involve a complete or partial loss of the sense of smell.

Use this code when documentation explicitly states a diagnosis of parosmia. This typically occurs following viral infections (e.g., COVID-19), head trauma, or other neurological conditions affecting the olfactory pathways. Documentation should clearly indicate a qualitative distortion of smell, not merely a reduction or absence.

• Differentiate from anosmia (R43.0) or hyposmia (R43.8) based on documentation of qualitative vs. quantitative smell disturbance.
• Ensure the provider's notes specifically use the term "parosmia" or clearly describe the characteristic distorted smell perception.
• This code can be a sequela of other conditions; consider sequencing with the underlying cause if still active.