ICD-10-CM 2027
ICD-10 code for ear cat
From the official ICD-10-CM alphabetic index entry “Cat › ear”. Page updated September 29, 2026.
About coding ear cat
The ICD-10-CM code for ear cat is Q17.3 (Other misshapen ear).
Within Q17, choose Q17.3 (Other misshapen ear) only when documentation doesn't support a more specific option: accessory auricle (Q17.0), Macrotia (Q17.1), Microtia (Q17.2), Misplaced ear (Q17.4), prominent ear (Q17.5), other specified congenital malformations of ear (Q17.8) 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.
Common questions about ear cat ICD-10 codes
What is the ICD-10 code for ear cat?
- Q17.3 — Other misshapen ear.
Is Q17.3 billable?
- Yes. Q17.3 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Q17.3 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Q17.3 as a principal diagnosis.
Is Q17.3 a CC or MCC?
- No. Q17.3 is neither a CC nor an MCC under MS-DRG v44.0.