D09.9 is the authoritative medical code for Carcinoma in situ, unspecified. This classification is used in medical billing and clinical recording to specify the clinical criteria for carcinoma in situ, unspecified (ICD-10-CM D09.9), 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
Carcinoma in situ, unspecified is a billable ICD-10-CM diagnosis code D09.9. Includes: Bowen's disease; erythroplasia; grade III intraepithelial neoplasia; Queyrat's erythroplasia. Excludes1 (not coded here): melanoma in situ D03.-.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for D09.9 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.
Frequently Asked Questions (FAQ) & Clinical Guidance
What can't be coded together with D09.9?
Per Excludes1 instructions, D09.9 must not be reported with: melanoma in situ (D03.-).
Codes in This Family (11)
Official ICD-10-CM classifications in the same code family as D09.9, with their registry titles.
- D09 — Carcinoma in situ of other and unspecified sites
- D09.0 — Carcinoma in situ of bladder
- D09.1 — Carcinoma in situ of other and unspecified urinary organs
- D09.10 — Carcinoma in situ of unspecified urinary organ
- D09.19 — Carcinoma in situ of other urinary organs
- D09.2 — Carcinoma in situ of eye
- D09.20 — Carcinoma in situ of unspecified eye
- D09.21 — Carcinoma in situ of right eye
- D09.22 — Carcinoma in situ of left eye
- D09.3 — Carcinoma in situ of thyroid and other endocrine glands
- D09.8 — Carcinoma in situ of other specified sites
Neoplasm Table Sites (2)
Anatomical sites from the official ICD-10-CM Table of Neoplasms that map to this code, with the matching behavior column.
- Neoplasm, neoplastic — Ca in situ
- Neoplasm, neoplastic, unknown site or unspecified — 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 D13.9
Benign neoplasm of ill-defined sites within the digestive system