ICD-10 code for breast malformation

The ICD-10-CM code for breast malformation is Q83.9 (Congenital malformation of breast, unspecified). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on Q83.9.

Within Q83, choose Q83.9 (Congenital malformation of breast, unspecified) only when documentation doesn't support a more specific option: congenital absence of breast with absent nipple (Q83.0), accessory breast (Q83.1), absent nipple (Q83.2), accessory nipple (Q83.3) and other congenital malformations of breast (Q83.8).

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 600 (Non-Malignant Breast Disorders with CC/MCC, relative weight 0.9975) and DRG 601 (Non-Malignant Breast Disorders without CC/MCC, relative weight 0.6017), in MDC 09 (Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.