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ICD-10-CM 2027 diagnosis code

R92.342Mammographic extreme density, left breast

✓ Billable / specific

R92.342 is a valid, billable ICD-10-CM code for mammographic extreme density, left breast. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code last changed in FY2024 (effective October 1, 2023). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About R92.342

R92.342 is the ICD-10-CM diagnosis code for Mammographic extreme density, left breast. It belongs to category R92 (abnormal and inconclusive findings on diagnostic imaging of breast), block R90-R94 (abnormal findings on diagnostic imaging and in function studies, without diagnosis) and chapter 18 (symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within R92.34 (Mammographic extreme density of breast), R92.342 is specifically for Mammographic extreme density, left breast. Related codes cover right breast (R92.341) and bilateral breasts (R92.343).

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.

It was added in FY2024, effective October 1, 2023.

Notes that apply from higher levels

Instructions written at a parent level also apply to R92.342.

› From R92.3 Mammographic density found on imaging of breast
Code also
  • , if applicable, inconclusive mammogram (R92.2)

Broader instructions also apply from R90-R94 Abnormal findings on diagnostic imaging and in function studies, without diagnosis and Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

MDC 09 · Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2024 (effective 10/1/2023): Added
  • No changes since FY2024.

Common questions about R92.342

Is R92.342 billable?

Yes. R92.342 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can R92.342 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict R92.342 as a principal diagnosis.

Is R92.342 a CC or MCC?

No. R92.342 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does R92.342 group to?

R92.342 is used in the MS-DRG v44.0 logic for MS-DRG 600 (Non-Malignant Breast Disorders with CC/MCC) and MS-DRG 601 (Non-Malignant Breast Disorders without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.