ICD-10-CM 2027
ICD-10 code for breast pendulous
From the official ICD-10-CM alphabetic index entry “Pendulous › breast”. Page updated September 29, 2026.
About coding breast pendulous
The ICD-10-CM code for breast pendulous is N64.89 (Other specified disorders of breast).
Within N64.8, choose N64.89 (Other specified disorders of breast) only when documentation doesn't support a more specific option: ptosis of breast (N64.81) and hypoplasia of breast (N64.82).
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 pendulous ICD-10 codes
What is the ICD-10 code for breast pendulous?
- N64.89 — Other specified disorders of breast.
Is N64.89 billable?
- Yes. N64.89 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N64.89 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N64.89 as a principal diagnosis.
Is N64.89 a CC or MCC?
- No. N64.89 is neither a CC nor an MCC under MS-DRG v44.0.