ICD-10-CM 2027
ICD-10 code for dense breasts
From the official ICD-10-CM alphabetic index entry “Dense breasts”. Page updated September 29, 2026.
About coding dense breasts
The ICD-10-CM code for dense breasts is R92.30 (Dense breasts, unspecified).
Within R92.3, choose R92.30 (Dense breasts, unspecified) only when documentation doesn't support a more specific option: Mammographic fatty tissue density of breast (R92.31), Mammographic fibroglandular density of breast (R92.32), Mammographic heterogeneous density of breast (R92.33) and Mammographic extreme density of breast (R92.34).
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 dense breasts ICD-10 codes
What is the ICD-10 code for dense breasts?
- R92.30 — Dense breasts, unspecified.
Is R92.30 billable?
- Yes. R92.30 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can R92.30 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict R92.30 as a principal diagnosis.
Is R92.30 a CC or MCC?
- No. R92.30 is neither a CC nor an MCC under MS-DRG v44.0.