ICD-10-CM 2027
ICD-10 code for lung endometriosis
From the official ICD-10-CM alphabetic index entry “Endometriosis › lung”. Page updated September 29, 2026.
About coding lung endometriosis
The ICD-10-CM code for lung endometriosis is N80.B2 (Endometriosis of lung).
Within N80.B (endometriosis of cardiothoracic space), N80.B2 is specifically for endometriosis of lung. Related codes cover pleura (N80.B1), diaphragm (N80.B3), the pericardial space (N80.B4), the mediastinal space (N80.B5) and cardiothoracic space (N80.B6).
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 lung endometriosis ICD-10 codes
What is the ICD-10 code for lung endometriosis?
- N80.B2 — Endometriosis of lung.
Is N80.B2 billable?
- Yes. N80.B2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N80.B2 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N80.B2 as a principal diagnosis.
Is N80.B2 a CC or MCC?
- No. N80.B2 is neither a CC nor an MCC under MS-DRG v44.0.