ICD-10-CM 2027
ICD-10 code for Hypernasality
From the official ICD-10-CM alphabetic index entry “Hypernasality”. Page updated September 29, 2026.
About coding Hypernasality
The ICD-10-CM code for Hypernasality is R49.21 (Hypernasality).
Within R49.2 (Hypernasality and hyponasality), R49.21 is specifically for Hypernasality. Related codes cover hyponasality (R49.22).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 154 (Other Ear, Nose, Mouth and Throat Diagnoses with MCC, relative weight 1.5921), DRG 155 (Other Ear, Nose, Mouth and Throat Diagnoses with CC, relative weight 0.9322) and DRG 156 (Other Ear, Nose, Mouth and Throat Diagnoses without CC/MCC, relative weight 0.6659), in MDC 03 (Diseases and Disorders of the Ear, Nose, Mouth and Throat), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about Hypernasality ICD-10 codes
What is the ICD-10 code for Hypernasality?
- R49.21 — Hypernasality.
Is R49.21 billable?
- Yes. R49.21 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can R49.21 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict R49.21 as a principal diagnosis.
Is R49.21 a CC or MCC?
- No. R49.21 is neither a CC nor an MCC under MS-DRG v44.0.