2027 ICD-10-CM Diagnosis Code D00.1Carcinoma in situ of esophagus
ICD-10-CM Codes›C00–D49›D00-D09›D00
- Billable — Valid for Submission
- Chronic Condition
D00.1 is a billable ICD-10-CM diagnosis code for carcinoma in situ of esophagus. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 374 through 376. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Gastrointestinal cancers - esophagus.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Adenocarcinoma in situ of esophagus
- Carcinoma in situ of abdominal part of esophagus
- Carcinoma in situ of cervical esophagus
- Carcinoma in situ of esophagus
- Carcinoma in situ of lower third of esophagus
- Carcinoma in situ of middle third of esophagus
- Carcinoma in situ of thoracic part of esophagus
- Carcinoma in situ of upper third of esophagus
- Esophageal dysplasia
- High grade squamous intraepithelial neoplasia of esophagus
- Severe esophageal dysplasia
- Squamous cell carcinoma in situ of esophagus
- Squamous intraepithelial neoplasia of esophagus grade 3
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to D00.1: its own notes plus those printed at D00, block D00-D09, and Chapter 2. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- Bowen's disease
- erythroplasia
- grade III intraepithelial neoplasia
- Queyrat's erythroplasia
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Notes
General instructions on how these codes are used.
- Functional activity
- All neoplasms are classified in this chapter, whether they are functionally active or not. An additional code from Chapter 4 may be used, to identify functional activity associated with any neoplasm.
- Morphology [Histology]
- Chapter 2 classifies neoplasms primarily by site (topography), with broad groupings for behavior, malignant, in situ, benign, etc. The Table of Neoplasms should be used to identify the correct topography code. In a few cases, such as for malignant melanoma and certain neuroendocrine tumors, the morphology (histologic type) is included in the category and codes.
- Primary malignant neoplasms overlapping site boundaries
- A primary malignant neoplasm that overlaps two or more contiguous (next to each other) sites should be classified to the subcategory/code .8 ('overlapping lesion'), unless the combination is specifically indexed elsewhere. For multiple neoplasms of the same site that are not contiguous, such as tumors in different quadrants of the same breast, codes for each site should be assigned.
- Malignant neoplasm of ectopic tissue
- Malignant neoplasms of ectopic tissue are to be coded to the site mentioned, e.g., ectopic pancreatic malignant neoplasms are coded to pancreas, unspecified (C25.9).
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name D00.1, its category, or a range that includes it.
Applicable To 1
These notes mention D00.1.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Stage 0 Esophageal Cancer AJCC v7
stage 0 includes: for squamous cell carcinoma: tis (hgd), n0, m0, g1, gx, tumor location: any. for adenocarcinoma: tis (hgd), n0, m0, g1, gx. tis: high-grade dysplasia. n0: no regional lymph node metastasis. m0: no distant metastasis. g1: well differentiated. gx: grade cannot be assessed-stage grouping as g1. tumor location: location of the primary cancer site is defined by the position of the upper (proximal) edge of the tumor in the esophagus. (ajcc 7th ed.)
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. |
|---|---|---|---|---|---|---|
| esophagus | C15.9 | C78.89 | D00.1 | D13.0 | D37.8 | D49.0 |
| esophagus › abdominal | C15.5 | C78.89 | D00.1 | D13.0 | D37.8 | D49.0 |
| esophagus › cervical | C15.3 | C78.89 | D00.1 | D13.0 | D37.8 | D49.0 |
| esophagus › distal (third) | C15.5 | C78.89 | D00.1 | D13.0 | D37.8 | D49.0 |
| esophagus › lower (third) | C15.5 | C78.89 | D00.1 | D13.0 | D37.8 | D49.0 |
| esophagus › middle (third) | C15.4 | C78.89 | D00.1 | D13.0 | D37.8 | D49.0 |
| esophagus › proximal (third) | C15.3 | C78.89 | D00.1 | D13.0 | D37.8 | D49.0 |
| esophagus › thoracic | C15.4 | C78.89 | D00.1 | D13.0 | D37.8 | D49.0 |
| esophagus › upper (third) | C15.3 | C78.89 | D00.1 | D13.0 | D37.8 | D49.0 |
Patient EducationClinical
Esophageal Cancer
The esophagus is a hollow tube that carries food and liquids from your throat to your stomach. Early esophageal cancer usually does not cause symptoms. Later, you may have symptoms such as:
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert D00.1 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About D00.1Overview
What is the ICD-10 code for carcinoma in situ of esophagus?
The ICD-10-CM code for carcinoma in situ of esophagus is D00.1 (sometimes written as D001). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is D00.1 (Carcinoma in situ of oral cavity, esophagus and stomach) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report carcinoma in situ of esophagus on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does D00.1 group to?
When carcinoma in situ of esophagus is the principal diagnosis on an inpatient stay, it groups to MS-DRG 375, 374, 376, with relative weights from 0.8925 to 2.1101 depending on complications. Higher weights mean higher Medicare reimbursement.
Can D00.1 be reported with a code from D03?
Not as a rule. The Excludes1 note at D00, which applies to D00.1, lists "melanoma in situ (D03.-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What is the ICD-9 equivalent of D00.1?
Under the General Equivalence Mappings, carcinoma in situ of esophagus converts to ICD-9-CM 230.1 (ca in situ esophagus). The mapping is a direct match.
