ICD-10-CM 2027
ICD-10 code for breast tissue ectopic
From the official ICD-10-CM alphabetic index entry “Ectopic, ectopia (congenital) › breast tissue”. Page updated September 29, 2026.
About coding breast tissue ectopic
The ICD-10-CM code for breast tissue ectopic is Q83.8 (Other congenital malformations of breast).
Within Q83, choose Q83.8 (Other congenital malformations of breast) only when documentation doesn't support a more specific option: congenital absence of breast with absent nipple (Q83.0), accessory breast (Q83.1), absent nipple (Q83.2), accessory nipple (Q83.3) 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 tissue ectopic ICD-10 codes
What is the ICD-10 code for breast tissue ectopic?
- Q83.8 — Other congenital malformations of breast.
Is Q83.8 billable?
- Yes. Q83.8 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Q83.8 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Q83.8 as a principal diagnosis.
Is Q83.8 a CC or MCC?
- No. Q83.8 is neither a CC nor an MCC under MS-DRG v44.0.