Is K20 a billable ICD-10-CM code?

No. K20 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does K20 sit in the tabular list?

Diseases of the digestive system (K00-K95), in the block Diseases of esophagus, stomach and duodenum (K20-K31).

What cannot be coded together with K20?

K20 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

K20

K20 — Esophagitis

Non-billable headerICD-10-CM

K20 is a non-billable header ICD-10-CM code for esophagitis. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

erosion of esophagus (K22.1-)
esophagitis with gastro-esophageal reflux disease (K21.0-)
reflux esophagitis (K21.0-)
ulcerative esophagitis (K22.1-)

Excludes2 — not included here, but may coexist

The excluded condition is not part of this code, but a patient can have both. You may code both.

eosinophilic gastritis or gastroenteritis (K52.81)

Use additional code

Add a secondary code to capture the detail described below.

code to identify:
alcohol abuse and dependence (F10.-)

Risk adjustment

K20 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 K20

3 child codes. Green means billable.

Questions about K20

Is K20 a billable ICD-10-CM code?: No. K20 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does K20 sit in the tabular list?: Diseases of the digestive system (K00-K95), in the block Diseases of esophagus, stomach and duodenum (K20-K31).
What cannot be coded together with K20?: K20 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.