ICD-10-CM 2027
ICD-10 code for breast fibrous induration
From the official ICD-10-CM alphabetic index entry “Induration, indurated › breast (fibrous)”. Page updated September 29, 2026.
About coding breast fibrous induration
The ICD-10-CM code for breast fibrous induration is N64.51 (Induration of breast). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on N64.51.
Within N64.5 (other signs and symptoms in breast), N64.51 is specifically for Induration of breast. Related codes cover nipple discharge (N64.52), retraction of nipple (N64.53) and other signs and symptoms in breast (N64.59).
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.
More specific breast fibrous induration codes (official index)
- puerperal, postpartum O92.29 — Other disorders of breast associated with pregnancy and the puerperium
Common questions about breast fibrous induration ICD-10 codes
What is the ICD-10 code for breast fibrous induration?
- N64.51 — Induration of breast. More specific codes apply when the documentation supports them: O92.29.
Is N64.51 billable?
- Yes. N64.51 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N64.51 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N64.51 as a principal diagnosis.
Is N64.51 a CC or MCC?
- No. N64.51 is neither a CC nor an MCC under MS-DRG v44.0.