N64.51 ICD-10-CM Code: Induration of breast
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Inpatient Payment Groups (MS-DRG)
MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0 (FY2026), Appendix B.
- MS-DRG 600 — NON-MALIGNANT BREAST DISORDERS WITH CC/MCC (MDC 09)
- MS-DRG 601 — NON-MALIGNANT BREAST DISORDERS WITHOUT CC/MCC (MDC 09)
A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.
Official Registry Overview & Definition
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for N64.51 in the official ICD-10-CM tabular list.
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- disorders of breast associated with childbirth (O91-O92)
Excludes2 — Not Included Here
Conditions not covered by this code, but which may be reported alongside it when both are present.
- abnormal findings on diagnostic imaging of breast (R92.-)
- mechanical complication of breast prosthesis and implant (T85.4-)
Nearest Codes in This Family
Official ICD-10-CM classifications closest to N64.51 in its code family, with their registry titles.
- N64.1 — Fat necrosis of breast
- N64.2 — Atrophy of breast
- N64.3 — Galactorrhea not associated with childbirth
- N64.4 — Mastodynia
- N64.5 — Other signs and symptoms in breast
- N64.52 — Nipple discharge
- N64.53 — Retraction of nipple
- N64.59 — Other signs and symptoms in breast
- N64.8 — Other specified disorders of breast
- N64.81 — Ptosis of breast
Indexed Clinical Terms (1)
Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.
- Induration, indurated, breast (fibrous)