D31 vs D33.3
D31 and D33.3 can never be reported together. ICD-10-CM declares them mutually exclusive with an Excludes1 note, meaning the two conditions cannot occur in the same patient — so exactly one of them is correct for any given encounter.
The official note, declared on D31
benign neoplasm of optic nerve (D33.3)
D33.3
Benign neoplasm of cranial nerves
Billable
- Chapter 2
- Neoplasms
- Section
- D10-D36
Use when the record says
- Benign neoplasm of olfactory bulb
Indexed under
- Neurilemmoma › acoustic
- Neuroma › acoustic
- Neuroma › optic
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