Excludes1 pair
H40- vs H42
H40 and H42 are not coded together. ICD-10-CM declares them mutually exclusive with an Excludes1 note — the two conditions are not expected to occur together, so exactly one of them is normally correct for a given encounter. The Official Guidelines carve out one exception: if the two conditions are clearly unrelated to each other, both may be reported.
The official note, declared on H42
neovascular secondary angle closure glaucoma (H40.84-)
H42
Glaucoma in diseases classified elsewhere
Billable
- Chapter 7
- Diseases of the eye and adnexa
- Section
- H40-H42
Indexed under
- Glaucoma › in › amyloidosis
- Glaucoma › in › aniridia
- Glaucoma › in › endocrine disease NOS
- Glaucoma › in › Lowe's syndrome
- Glaucoma › in › metabolic disease NOS
Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027