Q83.1 Accessory breast

Billable ICD-10-CM code, FY2026. Exempt from present-on-admission (POA) reporting.

Applicable to

• Supernumerary breast

Applies from Q83 Congenital malformations of breast

Excludes2 (not included here)

• absence of pectoral muscle (Q79.8)
• hypoplasia of breast (N64.82)
• micromastia (N64.82)

MS-DRG index

Defines the logic of DRG(s) 600-601 in MDC 09.

Approximate ICD-9-CM (GEMs)

• 757.6 Specified congenital anomalies of breast (approximate)

Code annotations containing back-references to Q83.1

Back-references to Q83

• Type 1 Excludes: P83 Other conditions of integument specific to newborn ("congenital malformations of skin and integument (Q80-Q84)")

Diagnosis Index entries for Q83.1

• Accessory (congenital) › breast tissue, axilla
• Axilla, axillary › breast
• Polymastia
• Supernumerary (congenital) › breast

Nearby codes

• Q83 Congenital malformations of breast
• Q83.0 Congenital absence of breast with absent nipple
• Q83.1 Accessory breast (this code)
• Q83.2 Absent nipple
• Q83.3 Accessory nipple
• Q83.8 Other congenital malformations of breast
• Q83.9 Congenital malformation of breast, unspecified