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Dx

ICD-10-CM 2027

ICD-10 code for breast adenocarcinoma-in-situ

D05.9

Unspecified type of carcinoma in situ of breast

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Adenocarcinoma-in-situ › breast”. Page updated September 29, 2026.

About coding breast adenocarcinoma-in-situ

The ICD-10-CM code for breast adenocarcinoma-in-situ is D05.9 (Unspecified type of carcinoma in situ of breast).

Within D05, choose D05.9 (Unspecified type of carcinoma in situ of breast) only when documentation doesn't support a more specific option: lobular carcinoma in situ of breast (D05.0), Intraductal carcinoma in situ of breast (D05.1) and other specified type of carcinoma in situ of breast (D05.8).

To report this condition, pick the subcode that matches the documentation: D05.90 (breast), D05.91 (breast) and D05.92 (breast).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Common questions about breast adenocarcinoma-in-situ ICD-10 codes

What is the ICD-10 code for breast adenocarcinoma-in-situ?

D05.9 — Unspecified type of carcinoma in situ of breast (a header code; report a more specific subcode).

Is D05.9 billable?

No. D05.9 is a header code. Report one of its more specific subcodes instead.