K21.0
K21.0 — Gastro-esophageal reflux disease with esophagitis
Non-billable headerICD-10-CM
K21.0 is a non-billable header ICD-10-CM code for gastro-esophageal reflux disease with esophagitis. It cannot be billed on its own: choose one of the more specific child codes below.
Other codes that can never be billed with K21.0
These codes carry an Excludes1 note pointing at K21.0. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading K21.0 alone.
- K20Esophagitis
Risk adjustment
K21.0 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Code to one of these instead K21.0
2 child codes. Green means billable.
Related codes at this level
Codes that share K21. If K21.0 is not quite right, the correct code is usually one of these.
Questions about K21.0
- Is K21.0 a billable ICD-10-CM code?
- No. K21.0 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does K21.0 sit in the tabular list?
- Diseases of the digestive system (K00-K95), in the block Diseases of esophagus, stomach and duodenum (K20-K31).