ICD-10 code for infective mastitis

The ICD-10-CM code for infective mastitis is N61.0 (Mastitis without abscess). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on N61.0.

Within N61, choose N61.0 (Mastitis without abscess) only when documentation doesn't support a more specific option: abscess of the breast and nipple (N61.1) and granulomatous mastitis (N61.2).

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.