ICD-10-CM 2027
ICD-10 code for breast supernumerary
From the official ICD-10-CM alphabetic index entry “Supernumerary (congenital) › breast”. Page updated September 29, 2026.
About coding breast supernumerary
The ICD-10-CM code for breast supernumerary is Q83.1 (Accessory breast).
Within Q83 (congenital malformations of breast), Q83.1 is specifically for accessory breast. Related codes cover congenital absence of breast with absent nipple (Q83.0), absent nipple (Q83.2), accessory nipple (Q83.3), other congenital malformations of breast (Q83.8) and congenital malformation of breast, unspecified (Q83.9).
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 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.
Common questions about breast supernumerary ICD-10 codes
What is the ICD-10 code for breast supernumerary?
- Q83.1 — Accessory breast.
Is Q83.1 billable?
- Yes. Q83.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Q83.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Q83.1 as a principal diagnosis.
Is Q83.1 a CC or MCC?
- No. Q83.1 is neither a CC nor an MCC under MS-DRG v44.0.