D05.12 is the authoritative medical code for Intraductal carcinoma in situ of left breast. This classification is used in medical billing and clinical recording to specify the clinical criteria for intraductal carcinoma in situ of left breast (ICD-10-CM D05.12), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Official Registry Overview & Definition
Intraductal carcinoma in situ of left breast is a billable ICD-10-CM diagnosis code D05.12. Includes: Bowen's disease; erythroplasia; grade III intraepithelial neoplasia; Queyrat's erythroplasia. Excludes1 (not coded here): carcinoma in situ of skin of breast D04.5; melanoma in situ of breast skin D03.5; Paget's disease of breast or nipple C50.-. Excludes2 (not included here): malignant neoplasm of breast C50.-.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for D05.12 in the official ICD-10-CM tabular list.
Includes
Conditions the official ICD-10-CM tabular list includes under this code.
- Bowen's disease
- erythroplasia
- grade III intraepithelial neoplasia
- Queyrat's erythroplasia
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- carcinoma in situ of skin of breast D04.5
- melanoma in situ of breast skin D03.5
- Paget's disease of breast or nipple C50.-
Excludes2 — Not Included Here
Conditions not covered by this code, but which may be reported alongside it when both are present.
- malignant neoplasm of breast C50.-
Frequently Asked Questions (FAQ) & Clinical Guidance
What can't be coded together with D05.12?
Per Excludes1 instructions, D05.12 must not be reported with: carcinoma in situ of skin of breast (D04.5); melanoma in situ of breast (skin) (D03.5); Paget's disease of breast or nipple (C50.-).
Can D05.12 be reported alongside related conditions?
Per Excludes2 instructions, D05.12 and the following may both be reported when both are present: malignant neoplasm of breast (C50.-).
Codes in This Family (16)
Official ICD-10-CM classifications in the same code family as D05.12, with their registry titles.
- D05 — Carcinoma in situ of breast
- D05.0 — Lobular carcinoma in situ of breast
- D05.00 — Lobular carcinoma in situ of unspecified breast
- D05.01 — Lobular carcinoma in situ of right breast
- D05.02 — Lobular carcinoma in situ of left breast
- D05.1 — Intraductal carcinoma in situ of breast
- D05.10 — Intraductal carcinoma in situ of unspecified breast
- D05.11 — Intraductal carcinoma in situ of right breast
- D05.8 — Other specified type of carcinoma in situ of breast
- D05.80 — Other specified type of carcinoma in situ of unspecified breast
- D05.81 — Other specified type of carcinoma in situ of right breast
- D05.82 — Other specified type of carcinoma in situ of left breast
- D05.9 — Unspecified type of carcinoma in situ of breast
- D05.90 — Unspecified type of carcinoma in situ of unspecified breast
- D05.91 — Unspecified type of carcinoma in situ of right breast
- D05.92 — Unspecified type of carcinoma in situ of left breast
Neoplasm Table Sites (17)
Anatomical sites from the official ICD-10-CM Table of Neoplasms that map to this code, with the matching behavior column.
- Neoplasm, neoplastic, areola — Ca in situ
- Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts) — Ca in situ
- Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), areola — Ca in situ
- Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), axillary tail — Ca in situ
- Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), central portion — Ca in situ
- Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), inner — Ca in situ
- Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), lower — Ca in situ
- Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), lower-inner quadrant — Ca in situ
- Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), lower-outer quadrant — Ca in situ
- Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), midline — Ca in situ
- Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), nipple — Ca in situ
- Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), outer — Ca in situ
- Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), tail (axillary) — Ca in situ
- Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), upper — Ca in situ
- Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), upper-inner quadrant — Ca in situ
- Neoplasm, neoplastic, breast (connective tissue) (glandular tissue) (soft parts), upper-outer quadrant — Ca in situ
- Neoplasm, neoplastic, nipple — Ca in situ
Related Codes & Numerical Sequence (Crawl Map)
Search engines and indexers are advised to traverse adjacent medical codes in this sub-chapter range to find correlated diagnoses or therapeutic procedures:
ICD Code D04.12
Carcinoma in situ of skin of left eyelid, including canthus