NPI Atlas

Q83.1 – Accessory breast

ICD-10-CM 2027 diagnosis code · Other congenital malformations

Billable code

ICD-10-CM code Q83.1

Code: Q83.1 (claims format: Q831)
Description: Accessory breast
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 17. Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1)
Block: Q80-Q89 Other congenital malformations
Parent codes: Q83

Notes for Q83.1

Applicable to:

Supernumerary breast

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Q83 – Congenital malformations of breast

Excludes2 (not included here):

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

Index terms for Q83.1

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in Q83

Q83.0 – Congenital absence of breast with absent nippleBillable
Q83.2 – Absent nippleBillable
Q83.3 – Accessory nippleBillable
Q83.8 – Other congenital malformations of breastBillable
Q83.9 – Congenital malformation of breast, unspecifiedBillable

Frequently asked questions

What is ICD-10 code Q83.1?

Q83.1 is the ICD-10-CM code for accessory breast, in the block Q80-Q89 (Other congenital malformations).

Is Q83.1 a billable code?

Yes. Q83.1 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does Q83.1 belong to?

It belongs to category Q83 – Congenital malformations of breast.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.