2026 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 2026 (October 1, 2025 through September 30, 2026) 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
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Barrett Esophagus
a condition with damage to the lining of the lower esophagus resulting from chronic acid reflux (esophagitis, reflux). through the process of metaplasia, the squamous cells are replaced by a columnar epithelium with cells resembling those of the intestine or the salmon-pink mucosa of the stomach. barrett's columnar epithelium is a marker for severe reflux and precursor to adenocarcinoma of the esophagus.Esophageal Motility Disorders
disorders affecting the motor function of the upper esophageal sphincter; lower esophageal sphincter; the esophagus body, or a combination of these parts. the failure of the sphincters to maintain a tonic pressure may result in gastric reflux of food and acid into the esophagus (gastroesophageal reflux). other disorders include hypermotility (spastic disorders) and markedly increased amplitude in contraction (nutcracker esophagus).Esophageal Mucosa
circular innermost layer of the esophagus wall that mediates esophageal peristalsis which pushes ingested food bolus toward the stomach.Esophageal Neoplasms
tumors or cancer of the esophagus.Esophagus
the muscular membranous segment between the pharynx and the stomach in the upper gastrointestinal tract.
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
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, 2025 through September 30, 2026.
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 374, 375, 376, with relative weights from 0.9243 to 2.1387 depending on complications. Higher weights mean higher Medicare reimbursement.
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.
Footnotes
[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:
- The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
- The condition places limitations on self-care, independent living, and social interactions.
