2026 ICD-10-CM Diagnosis Code D00.02Carcinoma in situ of buccal mucosa
ICD-10-CM Codes›C00–D49›D00-D09›D00
- Billable — Valid for Submission
- Chronic Condition
D00.02 is a billable ICD-10-CM diagnosis code for carcinoma in situ of buccal mucosa. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 11 through 13, 146 through 148. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Head and neck cancers - lip and oral cavity.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Carcinoma in situ of buccal mucosa
- Carcinoma in situ of lower buccal sulcus
- Carcinoma in situ of lower labial sulcus
- Carcinoma in situ of oral cavity
- Carcinoma in situ of upper buccal sulcus
- Carcinoma in situ of vestibule of mouth
- Carcinoma in situ upper labial sulcus
- Carcinoma-in-situ of oral mucosa
- Neoplasm of buccal mucosa
- Neoplasm of mandibular buccal sulcus
- Neoplasm of mandibular labial sulcus
- Neoplasm of maxillary buccal sulcus
- Neoplasm of maxillary labial sulcus
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Table of NeoplasmsClinical
Anatomical sites in the Table of Neoplasms that reference this code family.
| Site | Malig. Primary | Malig. Secondary | Ca in situ | Benign | Uncertain | Unspec. |
|---|---|---|---|---|---|---|
| alveolar › sulcus | C06.1 | C79.89 | D00.02 | D10.39 | D37.09 | D49.0 |
| buccal (cavity) › commissure | C06.0 | C79.89 | D00.02 | D10.39 | D37.09 | D49.0 |
| buccal (cavity) › groove (lower) (upper) | C06.1 | C79.89 | D00.02 | D10.39 | D37.09 | D49.0 |
| buccal (cavity) › mucosa | C06.0 | C79.89 | D00.02 | D10.39 | D37.09 | D49.0 |
| buccal (cavity) › sulcus (lower) (upper) | C06.1 | C79.89 | D00.02 | D10.39 | D37.09 | D49.0 |
| cheek › inner aspect | C06.0 | C79.89 | D00.02 | D10.39 | D37.09 | D49.0 |
| cheek › internal | C06.0 | C79.89 | D00.02 | D10.39 | D37.09 | D49.0 |
| cheek › mucosa | C06.0 | C79.89 | D00.02 | D10.39 | D37.09 | D49.0 |
| labial [See Also: Neoplasm, lip] › sulcus (lower) (upper) | C06.1 | C79.89 | D00.02 | D10.39 | D37.09 | D49.0 |
| mucosa › buccal | C06.0 | C79.89 | D00.02 | D10.39 | D37.09 | D49.0 |
| mucosa › cheek | C06.0 | C79.89 | D00.02 | D10.39 | D37.09 | D49.0 |
| mucosa › oral | C06.0 | C79.89 | D00.02 | D10.39 | D37.09 | D49.0 |
| oral (cavity) › mucosa | C06.0 | C79.89 | D00.02 | D10.39 | D37.09 | D49.0 |
Patient EducationClinical
Oral Cancer
Oral cancer is cancer of the mouth. It is a type of head and neck cancer. Most oral cancers are squamous cell cancers. They begin in the flat cells that cover the surfaces of your mouth, tongue, and lips. The cancer cells may spread into deeper tissue as the cancer grows.
The full article covers:
- What is oral cancer?
- Who is more likely to develop oral cancer?
- What are the symptoms of oral cancer?
- How is oral cancer diagnosed?
- What are the treatments for oral cancer?
- Can oral cancer be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert D00.02 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About D00.02Overview
What is the ICD-10 code for carcinoma in situ of buccal mucosa?
The ICD-10-CM code for carcinoma in situ of buccal mucosa is D00.02 (sometimes written as D0002). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is D00.02 (Carcinoma in situ of lip, oral cavity and pharynx) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report carcinoma in situ of buccal mucosa on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does D00.02 group to?
When carcinoma in situ of buccal mucosa is the principal diagnosis on an inpatient stay, it groups to MS-DRG 11, 12, 13, 146, 147, 148, with relative weights from 0.7971 to 5.4541 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of D00.02?
Under the General Equivalence Mappings, carcinoma in situ of buccal mucosa converts to ICD-9-CM 230.0 (ca in situ oral cav/phar). The mapping is approximate, so confirm the match fits the documentation.
