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ICD-10-CM 2027 diagnosis code

Q33.2Sequestration of lung

✓ Billable / specificPOA exemptMCC — major complication/comorbidity

Q33.2 is a valid, billable ICD-10-CM code for sequestration of lung. 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 Q33.2

Q33.2 is the ICD-10-CM diagnosis code for sequestration of lung. It belongs to category Q33 (congenital malformations of lung), block Q30-Q34 (congenital malformations of the respiratory system) and chapter 17 (congenital malformations, deformations, chromosomal abnormalities, and genetic disorders). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within Q33 (congenital malformations of lung), Q33.2 is specifically for sequestration of lung. Related codes cover congenital cystic lung (Q33.0), accessory lobe of lung (Q33.1), agenesis of lung (Q33.3), congenital bronchiectasis (Q33.4), ectopic tissue in lung (Q33.5), congenital hypoplasia and dysplasia of lung (Q33.6), other congenital malformations of lung (Q33.8) and congenital malformation of lung, unspecified (Q33.9).

As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 205 (Other Respiratory System Diagnoses with MCC, relative weight 1.8244) and DRG 206 (Other Respiratory System Diagnoses without MCC, relative weight 0.9257), 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 is exempt from present-on-admission (POA) reporting, so no POA indicator is required.

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 748.5 (agenesis, hypoplasia, and dysplasia of lung).

Notes that apply from higher levels

Instructions written at a parent level also apply to Q33.2.

Broader instructions also apply from Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to Q33.2.

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 →
  • 748.5Agenesis, hypoplasia, and dysplasia of lungapproximate

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 Q33.2

Is Q33.2 billable?

Yes. Q33.2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can Q33.2 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict Q33.2 as a principal diagnosis.

Is Q33.2 a CC or MCC?

Q33.2 is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does Q33.2 group to?

Q33.2 is used in the MS-DRG v44.0 logic for MS-DRG 205 (Other Respiratory System Diagnoses with MCC) and MS-DRG 206 (Other Respiratory System Diagnoses without 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 Q33.2?

The CMS General Equivalence Mappings map Q33.2 to ICD-9-CM 748.5.