2026 ICD-10-CM Diagnosis Code D02.4Carcinoma in situ of respiratory system, unspecified
ICD-10-CM Codes›C00–D49›D00-D09›D02
- Billable — Valid for Submission
- Chronic Condition
D02.4 is a billable ICD-10-CM diagnosis code for carcinoma in situ of respiratory system, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 180 through 182. Coders also document this condition as carcinoma in situ of respiratory and intrathoracic organ. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Respiratory cancers.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Carcinoma in situ of respiratory and intrathoracic organ
- Carcinoma in situ of respiratory system
- Carcinoma in situ of respiratory tract
- Carcinoma in situ of upper respiratory tract
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.
Patient EducationClinical
Cancer
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Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert D02.4 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About D02.4Overview
Is D02.4 (Carcinoma in situ of middle ear and respiratory system) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report carcinoma in situ of respiratory system, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does D02.4 group to?
When carcinoma in situ of respiratory system, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 180, 181, 182, with relative weights from 0.7440 to 1.7660 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of D02.4?
Under the General Equivalence Mappings, carcinoma in situ of respiratory system, unspecified converts to ICD-9-CM 231.9 (ca in situ resp sys NOS). 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.
