D05.9 ICD-10-CM Code: Unspecified type of carcinoma in situ of breast
D05.9 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · free HCC coding tools
HCC Buddy Code Card
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FY 2026 Apr update / Neoplasms (C00-D49) / In situ neoplasms (D00-D09)
D05.9
Header CodeICD-10-CMOfficial ICD-10-CMCodebook guidanceUnspecified type of carcinoma in situ of breast
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialNo inclusion terms are included in this display for D05.9. Check the code and parent instructions in the Code Book.
Excludes 2
Official- malignant neoplasm of breast (C50.-)Inherited from D05
Related Codes
Includes
Official- Bowen's diseaseInherited from D00-D09
- erythroplasiaInherited from D00-D09
- grade III intraepithelial neoplasiaInherited from D00-D09
- Queyrat's erythroplasiaInherited from D00-D09
Excludes 1
Official- carcinoma in situ of skin of breast (D04.5)Inherited from D05
- melanoma in situ of breast (skin) (D03.5)Inherited from D05
- Paget's disease of breast or nipple (C50.-)Inherited from D05
Code First
OfficialNo Code First sequencing instructions are included in this display for D05.9. Check the code and parent instructions in the Code Book.
Use Additional
OfficialNo Use Additional Code instructions are included in this display for D05.9. Check the code and parent instructions in the Code Book.
Code Also
OfficialNo Code Also instructions are included in this display for D05.9. Check the code and parent instructions in the Code Book.
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
- Code
- D05.9
- Description
- Unspecified type of carcinoma in situ of breast
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- No
- Payment year
- 2026
Coder workflow notes
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What This Code Means
D05.9 is the ICD-10-CM diagnosis code for unspecified type of carcinoma in situ of breast. D05.9 sits in the ICD-10-CM chapter for neoplasms (c00-d49), within the section covering in situ neoplasms (d00-d09).
Header codes like D05.9 cannot be reported on claims directly; they organize child codes that share clinical context. Coders should select the billable child code that matches the documented presentation and then verify its current source-backed HCC mapping. Do not infer a child code or risk adjustment value from the header alone.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for D05.9 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.