Skip to content
Dx

ICD-10-CM 2027 diagnosis code

D05.01Lobular carcinoma in situ of right breast

✓ Billable / specific

D05.01 is a valid, billable ICD-10-CM code for lobular carcinoma in situ of right breast. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About D05.01

D05.01 is the ICD-10-CM diagnosis code for lobular carcinoma in situ of right breast. It belongs to category D05 (carcinoma in situ of breast), block D00-D09 (in situ neoplasms) and chapter 2 (neoplasms). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within D05.0 (lobular carcinoma in situ of breast), D05.01 is specifically for lobular carcinoma in situ of right breast. Related codes cover unspecified breast (D05.00) and left breast (D05.02).

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 582 (Mastectomy for Malignancy with CC/MCC, relative weight 1.8006), DRG 583 (Mastectomy for Malignancy without CC/MCC, relative weight 1.8006), DRG 597 (Malignant Breast Disorders with MCC, relative weight 1.7383), DRG 598 (Malignant Breast Disorders with CC, relative weight 1.0962) and DRG 599 (Malignant Breast Disorders without CC/MCC, relative weight 0.6925), 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 has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 233.0 (carcinoma in situ of breast).

Notes that apply from higher levels

Instructions written at a parent level also apply to D05.01.

› From D05 Carcinoma in situ of breast
Excludes1
  • carcinoma in situ of skin of breast (D04.5)
  • malignant neoplasm of breast (C50.-)
  • melanoma in situ of breast (skin) (D03.5)
  • Paget's disease of breast or nipple (C50.-)

Broader instructions also apply from D00-D09 In situ neoplasms and Chapter 2: Neoplasms.

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

ICD-9-CM equivalent

Converter →
  • 233.0Carcinoma in situ of breastapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

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
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about D05.01

Is D05.01 billable?

Yes. D05.01 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can D05.01 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict D05.01 as a principal diagnosis.

Is D05.01 a CC or MCC?

No. D05.01 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does D05.01 group to?

D05.01 is used in the MS-DRG v44.0 logic for MS-DRG 582 (Mastectomy for Malignancy with CC/MCC), MS-DRG 583 (Mastectomy for Malignancy without CC/MCC), MS-DRG 597 (Malignant Breast Disorders with MCC), MS-DRG 598 (Malignant Breast Disorders with CC) and MS-DRG 599 (Malignant Breast Disorders without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for D05.01?

The CMS General Equivalence Mappings map D05.01 to ICD-9-CM 233.0.