2027 ICD-10-CM Diagnosis Code D05.12Intraductal carcinoma in situ of left breast
ICD-10-CM Codes›C00–D49›D00-D09›D05
- Billable — Valid for Submission
- Chronic Condition
D05.12 is a billable ICD-10-CM diagnosis code for intraductal carcinoma in situ of left breast. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 582 through 583, 597 through 599. Coders also document this condition as bilateral carcinoma in situ of breasts. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Breast cancer - ductal carcinoma in situ (DCIS).
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Bilateral carcinoma in situ of breasts
- Carcinoma in situ of left breast
- Carcinoma in situ of right breast
- Ductal carcinoma in situ of bilateral breasts
- Ductal carcinoma in situ of breast
- Ductal carcinoma in situ of left breast
- Ductal carcinoma in situ of right breast
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to D05.12: its own notes plus those printed at D05, block D00-D09, and Chapter 2. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- Bowen's disease
- erythroplasia
- grade III intraepithelial neoplasia
- Queyrat's erythroplasia
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Notes
General instructions on how these codes are used.
- Functional activity
- All neoplasms are classified in this chapter, whether they are functionally active or not. An additional code from Chapter 4 may be used, to identify functional activity associated with any neoplasm.
- Morphology [Histology]
- Chapter 2 classifies neoplasms primarily by site (topography), with broad groupings for behavior, malignant, in situ, benign, etc. The Table of Neoplasms should be used to identify the correct topography code. In a few cases, such as for malignant melanoma and certain neuroendocrine tumors, the morphology (histologic type) is included in the category and codes.
- Primary malignant neoplasms overlapping site boundaries
- A primary malignant neoplasm that overlaps two or more contiguous (next to each other) sites should be classified to the subcategory/code .8 ('overlapping lesion'), unless the combination is specifically indexed elsewhere. For multiple neoplasms of the same site that are not contiguous, such as tumors in different quadrants of the same breast, codes for each site should be assigned.
- Malignant neoplasm of ectopic tissue
- Malignant neoplasms of ectopic tissue are to be coded to the site mentioned, e.g., ectopic pancreatic malignant neoplasms are coded to pancreas, unspecified (C25.9).
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name D05.12, its category, or a range that includes it.
Applicable To 1
These notes mention D05.12.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Breast Ductal Carcinoma In Situ|Ductal Breast Carcinoma In Situ
a breast carcinoma entirely confined to the mammary ducts. it is also known as dcis. there is no evidence of invasion of the basement membrane. currently, it is classified into three categories: high-grade dcis, intermediate-grade dcis and low-grade dcis. in this classification the dcis grade is defined by a combination of nuclear grade, architectural growth pattern and presence of necrosis. the size of the lesion as well as the grade and the clearance margins play a major role in dictating the most appropriate therapy for dcis.
Patient EducationClinical
Breast Cancer
Breast cancer is a cancer that starts in breast tissue. It happens when cells in the breast change and grow out of control. New cells grow even when you don't need them, and old cells don't die when they should. These extra cells can form a mass called a tumor.
The full article covers:
- What is breast cancer?
- What are the types of breast cancer?
- What causes breast cancer?
- Who is at risk for breast cancer?
- What are the signs and symptoms of breast cancer?
- How is breast cancer diagnosed?
- What are the treatments for breast cancer?
- Can breast cancer be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert D05.12 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About D05.12Overview
What is the ICD-10 code for intraductal carcinoma in situ of left breast?
The ICD-10-CM code for intraductal carcinoma in situ of left breast is D05.12 (sometimes written as D0512). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is D05.12 (Intraductal carcinoma in situ of breast) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report intraductal carcinoma in situ of left breast on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does D05.12 group to?
When intraductal carcinoma in situ of left breast is the principal diagnosis on an inpatient stay, it groups to MS-DRG 598, 582, 599, 597, 583, with relative weights from 0.6756 to 1.8014 depending on complications. Higher weights mean higher Medicare reimbursement.
Can D05.12 be reported with D04.5?
Not as a rule. The Excludes1 note at D05, which applies to D05.12, lists "carcinoma in situ of skin of breast (D04.5)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What is the ICD-9 equivalent of D05.12?
Under the General Equivalence Mappings, intraductal carcinoma in situ of left breast converts to ICD-9-CM 233.0 (ca in situ breast). The mapping is approximate, so confirm the match fits the documentation.
