G08 vs O22.5-
G08 and O22.5 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.
Intracranial and intraspinal phlebitis and thrombophlebitis
- Chapter 6
- Diseases of the nervous system
- Section
- G00-G09
- Septic embolism of intracranial or intraspinal venous sinuses and veins
- Septic endophlebitis of intracranial or intraspinal venous sinuses and veins
- Septic phlebitis of intracranial or intraspinal venous sinuses and veins
- Septic thrombophlebitis of intracranial or intraspinal venous sinuses and veins
- Septic thrombosis of intracranial or intraspinal venous sinuses and veins
- Embolism › intraspinal venous sinuses or veins
- Embolism › venous sinus
- Phlebitis › intracranial (venous) sinus (any)
- Phlebitis › intraspinal venous sinuses and veins
- Thrombophlebitis › cavernous sinus (venous)
Cerebral venous thrombosis in pregnancy
- Chapter 15
- Pregnancy, childbirth and the puerperium
- Section
- O20-O29
- Cerebrovenous sinus thrombosis in pregnancy
- Thrombophlebitis › cavernous sinus › complicating pregnancy
- Pregnancy › complicated by › thrombosis › cerebral venous
- Pregnancy › complicated by › thrombosis › cerebrovenous sinus
These two codes sit in different chapters of the Tabular List, which is usually the clearest signal that they describe different underlying processes rather than different degrees of the same one.
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