ICD-10-CM 2027
ICD-10 code for tissue in lung ectopic
From the official ICD-10-CM alphabetic index entry “Ectopic, ectopia (congenital) › tissue in lung”. Page updated September 29, 2026.
About coding tissue in lung ectopic
The ICD-10-CM code for tissue in lung ectopic is Q33.5 (Ectopic tissue in lung).
Within Q33 (congenital malformations of lung), Q33.5 is specifically for ectopic tissue in lung. Related codes cover congenital cystic lung (Q33.0), accessory lobe of lung (Q33.1), sequestration of lung (Q33.2), agenesis of lung (Q33.3), congenital bronchiectasis (Q33.4), congenital hypoplasia and dysplasia of lung (Q33.6), other congenital malformations of lung (Q33.8) and congenital malformation of lung, unspecified (Q33.9).
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 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.
Common questions about tissue in lung ectopic ICD-10 codes
What is the ICD-10 code for tissue in lung ectopic?
- Q33.5 — Ectopic tissue in lung.
Is Q33.5 billable?
- Yes. Q33.5 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Q33.5 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Q33.5 as a principal diagnosis.
Is Q33.5 a CC or MCC?
- No. Q33.5 is neither a CC nor an MCC under MS-DRG v44.0.