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ICD-10-CM 2027 diagnosis code

D02.4Carcinoma in situ of respiratory system, unspecified

✓ Billable / specific

D02.4 is a valid, billable ICD-10-CM code for carcinoma in situ of respiratory system, unspecified. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About D02.4

D02.4 is the ICD-10-CM diagnosis code for carcinoma in situ of respiratory system, unspecified. It belongs to category D02 (carcinoma in situ of middle ear and respiratory system), block D00-D09 (in situ neoplasms) and chapter 2 (neoplasms). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within D02, choose D02.4 (respiratory system, unspecified) only when documentation doesn't support a more specific option: larynx (D02.0), trachea (D02.1), bronchus and lung (D02.2) and other parts of respiratory system (D02.3).

Use an additional code to identify: exposure to environmental tobacco smoke (Z77.22), exposure to tobacco smoke in the perinatal period (P96.81), history of tobacco dependence (Z87.891), occupational exposure to environmental tobacco smoke (Z57.31), tobacco dependence (F17.-) and 1 more.

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 180 (Respiratory Neoplasms with MCC, relative weight 1.7806), DRG 181 (Respiratory Neoplasms with CC, relative weight 1.0936) and DRG 182 (Respiratory Neoplasms without CC/MCC, relative weight 0.7439), in MDC 04 (Diseases and Disorders of the Respiratory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 231.9 (carcinoma in situ of respiratory system, part unspecified).

Notes that apply from higher levels

Instructions written at a parent level also apply to D02.4.

› From D02 Carcinoma in situ of middle ear and respiratory system
Excludes1
  • melanoma in situ (D03.-)
Use additional code
  • code to identify:
  • exposure to environmental tobacco smoke (Z77.22)
  • exposure to tobacco smoke in the perinatal period (P96.81)
  • history of tobacco dependence (Z87.891)
  • occupational exposure to environmental tobacco smoke (Z57.31)
  • tobacco dependence (F17.-)
  • tobacco use (Z72.0)

Broader instructions also apply from D00-D09 In situ neoplasms and Chapter 2: Neoplasms.

Table of Drugs & Neoplasms entries

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 231.9Carcinoma in situ of respiratory system, part unspecifiedexact

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about D02.4

Is D02.4 billable?

Yes. D02.4 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can D02.4 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict D02.4 as a principal diagnosis.

Is D02.4 a CC or MCC?

No. D02.4 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does D02.4 group to?

D02.4 is used in the MS-DRG v44.0 logic for MS-DRG 180 (Respiratory Neoplasms with MCC), MS-DRG 181 (Respiratory Neoplasms with CC) and MS-DRG 182 (Respiratory Neoplasms without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for D02.4?

The CMS General Equivalence Mappings map D02.4 to ICD-9-CM 231.9.