Is E79 a billable ICD-10-CM code?

No. E79 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does E79 sit in the tabular list?

Endocrine, nutritional and metabolic diseases (E00-E89), in the block Metabolic disorders (E70-E88).

What cannot be coded together with E79?

E79 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

E79

E79 — Disorders of purine and pyrimidine metabolism

Non-billable headerICD-10-CM

E79 is a non-billable header ICD-10-CM code for disorders of purine and pyrimidine metabolism. 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.

Ataxia-telangiectasia (Q87.19)
Bloom's syndrome (Q82.8)
Cockayne's syndrome (Q87.19)
calculus of kidney (N20.0)
combined immunodeficiency disorders (D81.-)
Fanconi's anemia (D61.09)
gout (M1A.-, M10.-)
orotaciduric anemia (D53.0)
progeria (E34.8)
Werner's syndrome (E34.8)
xeroderma pigmentosum (Q82.1)

Other codes that can never be billed with E79

These codes carry an Excludes1 note pointing at E79. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading E79 alone.

R79Other abnormal findings of blood chemistry
D53.0Protein deficiency anemia
E72Other disorders of amino-acid metabolism

Risk adjustment

E79 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 E79

5 child codes. Green means billable.

Questions about E79

Is E79 a billable ICD-10-CM code?: No. E79 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does E79 sit in the tabular list?: Endocrine, nutritional and metabolic diseases (E00-E89), in the block Metabolic disorders (E70-E88).
What cannot be coded together with E79?: E79 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.