2026 ICD-10-CM Diagnosis Code D02.21Carcinoma in situ of right bronchus and lung

ICD-10-CM Codes›C00–D49›D00-D09›D02

ICD-10-CM D02.21
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

D02.21 is a billable ICD-10-CM diagnosis code for carcinoma in situ of right bronchus and lung. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Respiratory cancers.

Code Identity

ICD-10-CM Code
D02.21
Billable Status
Yes — Valid for Submission
Code Describes
Carcinoma in situ of right bronchus and lung
Short Description
Carcinoma in situ of right bronchus and lung
Same as the full description in the CMS dataset.
Parent Code
D02.2
Carcinoma in situ of bronchus and lung

Code Classification

ChapterC00–D49Neoplasms
SectionD00-D09In situ neoplasms
CategoryD02Carcinoma in situ of middle ear and respiratory system
This CodeD02.21Carcinoma in situ of right bronchus and lung

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Carcinoma in situ of bronchus and lung
  • Carcinoma in situ of bronchus of right lower lobe
  • Carcinoma in situ of bronchus of right middle lobe
  • Carcinoma in situ of bronchus of right upper lobe
  • Carcinoma in situ of lower lobe bronchus and lung
  • Carcinoma in situ of middle lobe bronchus and lung
  • Carcinoma in situ of middle lobe of right lung
  • Carcinoma in situ of right bronchus and lung
  • Carcinoma in situ of right lower lobe of lung
  • Carcinoma in situ of right upper lobe of lung
  • Carcinoma in situ of upper lobe bronchus and lung
  • Neoplasm of bronchus of middle lobe of right lung
  • Neoplasm of bronchus of right lower lobe
  • Neoplasm of bronchus of right upper lobe

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NEO022
Respiratory cancers
Default principal diagnosis: inpatient Yes · outpatient Yes

Table of NeoplasmsClinical

Anatomical sites in the Table of Neoplasms that reference this code family.

SiteMalig.
Primary		Malig.
Secondary		Ca
in situ		BenignUncertainUnspec.
bronchus › middle lobe of lungC34.2C78.0D02.21D14.31D38.1D49.1
lung › middle lobeC34.2C78.0D02.21D14.31D38.1D49.1

Patient EducationClinical

Lung Cancer

Lung cancer is cancer that forms in tissues of the lung, usually in the cells that line the air passages. It is the leading cause of cancer death in both men and women.

The full article covers:

  • What is lung cancer?
  • Who is more likely to develop lung cancer?
  • What are the symptoms of lung cancer?
  • How is lung cancer diagnosed?
  • What are the treatments for lung cancer?
  • Can lung cancer be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert D02.21 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
231.2 Ca in situ bronchus/lung
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About D02.21Overview

Is D02.21 (Carcinoma in situ of bronchus and lung) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report carcinoma in situ of right bronchus and lung on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does D02.21 group to?

When carcinoma in situ of right bronchus and lung 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 D02.21?

Under the General Equivalence Mappings, carcinoma in situ of right bronchus and lung converts to ICD-9-CM 231.2 (ca in situ bronchus/lung). The mapping is approximate, so confirm the match fits the documentation.

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.