ICD-9-CM procedure code (retired)
28.99 — Other operations on tonsils and adenoids
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 28.99
28.99 is an ICD-9-CM procedure code for other operations on 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 6 ICD-10-PCS codes, such as 0CQP0ZZ (Repair Tonsils, Open Approach), 0CQP3ZZ (Repair Tonsils, Percutaneous Approach) and 0CQPXZZ (Repair Tonsils, External Approach). All of these are approximate matches, so review the record to pick the right one.
ICD-10-PCS equivalents
- 0CQP0ZZRepair Tonsils, Open Approachapproximate
- 0CQP3ZZRepair Tonsils, Percutaneous Approachapproximate
- 0CQPXZZRepair Tonsils, External Approachapproximate
- 0CQQ0ZZRepair Adenoids, Open Approachapproximate
- 0CQQ3ZZRepair Adenoids, Percutaneous Approachapproximate
- 0CQQXZZRepair Adenoids, External Approachapproximate
Common questions about 28.99
What is the ICD-10 code for ICD-9 28.99?
- The GEMs map 28.99 to ICD-10-PCS 0CQP0ZZ, 0CQP3ZZ, 0CQPXZZ, 0CQQ0ZZ, 0CQQ3ZZ and 0CQQXZZ.
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.