ICD-10-CM 2027
ICD-10 code for breast density
From the official ICD-10-CM alphabetic index entry “Density › breast”. Page updated September 29, 2026.
About coding breast density
The ICD-10-CM code for breast density is R92.30 (Dense breasts, unspecified). The official index lists 5 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on R92.30.
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.
More specific breast density codes (official index)
- low R92.30 — Dense breasts, unspecified
- mammographic
- extreme R92.34 — Mammographic extreme density of breast
- fatty tissue R92.31 — Mammographic fatty tissue density of breast
- fibroglandular R92.32 — Mammographic fibroglandular density of breast
- heterogeneous R92.33 — Mammographic heterogeneous density of breast
Common questions about breast density ICD-10 codes
What is the ICD-10 code for breast density?
- R92.30 — Dense breasts, unspecified. More specific codes apply when the documentation supports them: R92.30, R92.34, R92.31, R92.32 and others below.
What is the ICD-10 code for low breast density?
- 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.