ICD-10 code for auditory canal hypoplasia

The ICD-10-CM code for auditory canal hypoplasia is Q17.8 (Other specified congenital malformations of ear). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on Q17.8.

Within Q17, choose Q17.8 (Other specified congenital malformations of ear) only when documentation doesn't support a more specific option: accessory auricle (Q17.0), Macrotia (Q17.1), Microtia (Q17.2), other misshapen ear (Q17.3), Misplaced ear (Q17.4), prominent ear (Q17.5) and congenital malformation of ear, unspecified (Q17.9).

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.