ICD-9-CM procedure code (retired)
28.11 — Biopsy of tonsils and adenoids
About ICD-9-CM 28.11
28.11 is an ICD-9-CM procedure code for biopsy of tonsils and adenoids. 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 18 ICD-10-PCS codes, such as 0C9P0ZX (Drainage of Tonsils, Open Approach, Diagnostic), 0C9P3ZX (Drainage of Tonsils, Percutaneous Approach, Diagnostic) and 0C9PXZX (Drainage of Tonsils, External Approach, Diagnostic). All of these are approximate matches, so review the record to pick the right one. Some mappings are combinations: more than one ICD-10 code is needed to fully express the ICD-9 code.
ICD-10-PCS equivalents
- 0C9P0ZXDrainage of Tonsils, Open Approach, Diagnosticapproximate
- 0C9P3ZXDrainage of Tonsils, Percutaneous Approach, Diagnosticapproximate
- 0C9PXZXDrainage of Tonsils, External Approach, Diagnosticapproximate
- 0C9Q0ZXDrainage of Adenoids, Open Approach, Diagnosticapproximate
- 0C9Q3ZXDrainage of Adenoids, Percutaneous Approach, Diagnosticapproximate
- 0C9QXZXDrainage of Adenoids, External Approach, Diagnosticapproximate
- 0CBP0ZXExcision of Tonsils, Open Approach, Diagnosticapproximate
- 0CBP0ZXExcision of Tonsils, Open Approach, Diagnosticapproximate · combination (scenario 1, choice 1)
- 0CBP3ZXExcision of Tonsils, Percutaneous Approach, Diagnosticapproximate
- 0CBP3ZXExcision of Tonsils, Percutaneous Approach, Diagnosticapproximate · combination (scenario 1, choice 1)
- 0CBPXZXExcision of Tonsils, External Approach, Diagnosticapproximate
- 0CBPXZXExcision of Tonsils, External Approach, Diagnosticapproximate · combination (scenario 1, choice 1)
- 0CBQ0ZXExcision of Adenoids, Open Approach, Diagnosticapproximate
- 0CBQ0ZXExcision of Adenoids, Open Approach, Diagnosticapproximate · combination (scenario 1, choice 2)
- 0CBQ3ZXExcision of Adenoids, Percutaneous Approach, Diagnosticapproximate · combination (scenario 1, choice 2)
- 0CBQ3ZXExcision of Adenoids, Percutaneous Approach, Diagnosticapproximate
- 0CBQXZXExcision of Adenoids, External Approach, Diagnosticapproximate
- 0CBQXZXExcision of Adenoids, External Approach, Diagnosticapproximate · combination (scenario 1, choice 2)
Common questions about 28.11
What is the ICD-10 code for ICD-9 28.11?
- The GEMs map 28.11 to ICD-10-PCS 0C9P0ZX, 0C9P3ZX, 0C9PXZX, 0C9Q0ZX, 0C9Q3ZX, 0C9QXZX and 12 more.
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.