Q83.9 – Congenital malformation of breast, unspecified

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

Billable code

ICD-10-CM code Q83.9

Code: Q83.9 (claims format: Q839)
Description: Congenital malformation of breast, unspecified
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 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 Q83.9

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
Q83.1 – Accessory breastBillable
Q83.2 – Absent nippleBillable
Q83.3 – Accessory nippleBillable
Q83.8 – Other congenital malformations of breastBillable

Frequently asked questions

What is ICD-10 code Q83.9?

Q83.9 is the ICD-10-CM code for congenital malformation of breast, unspecified, in the block Q80-Q89 (Other congenital malformations).

Is Q83.9 a billable code?

Yes. Q83.9 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does Q83.9 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.