ICD-9-CM procedure code (retired)
34.91 — Thoracentesis
ICD-9-CM was replaced by ICD-10 on October 1, 2015. These are the ICD-10-PCS equivalents from the CMS General Equivalence Mappings.
About ICD-9-CM 34.91
34.91 is an ICD-9-CM procedure code for Thoracentesis. ICD-9-CM was retired for U.S. claims on October 1, 2015, when ICD-10-PCS took over.
The CMS General Equivalence Mappings translate it to 4 ICD-10-PCS codes, such as 0B9N8ZZ (Drainage of Right Pleura, Via Natural or Artificial Opening Endoscopic), 0B9P8ZZ (Drainage of Left Pleura, Via Natural or Artificial Opening Endoscopic) and 0W993ZZ (Drainage of Right Pleural Cavity, Percutaneous Approach). All of these are approximate matches, so review the record to pick the right one.
ICD-10-PCS equivalents
- 0B9N8ZZDrainage of Right Pleura, Via Natural or Artificial Opening Endoscopicapproximate
- 0B9P8ZZDrainage of Left Pleura, Via Natural or Artificial Opening Endoscopicapproximate
- 0W993ZZDrainage of Right Pleural Cavity, Percutaneous Approachapproximate
- 0W9B3ZZDrainage of Left Pleural Cavity, Percutaneous Approachapproximate
Common questions about 34.91
What is the ICD-10 code for ICD-9 34.91?
- The GEMs map 34.91 to ICD-10-PCS 0B9N8ZZ, 0B9P8ZZ, 0W993ZZ and 0W9B3ZZ.
GEMs are a translation aid, not a substitute for coding from the record. The 2027 ICD-10 code set has changed since the last GEMs release in 2018. Page updated September 29, 2026.