2026 ICD-10-CM Diagnosis Code G08Intracranial and intraspinal phlebitis and thrombophlebitis
ICD-10-CM Codes›G00–G99›G00-G09›G08
- Billable — Valid for Submission
- MCC — Major Complication or Comorbidity
- Chronic Condition
G08 is a billable ICD-10-CM diagnosis code for intracranial and intraspinal phlebitis and thrombophlebitis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 23 through 24, 91 through 93. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 72 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other nervous system disorders (neither hereditary nor degenerative).
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Cavernous sinus syndrome
- Cerebral venous sinus thrombosis
- Cerebral venous thrombosis of cortical vein
- Cerebral venous thrombosis of sigmoid sinus
- Cerebral venous thrombosis of straight sinus
- Embolism of basilar sinus
- Embolism of cavernous venous sinus
- Embolism of inferior sagittal sinus
- Embolism of intracranial venous sinus
- Embolism of lateral venous sinus
- Endophlebitis
- Endophlebitis of basilar sinus
- Endophlebitis of cavernous venous sinus
- Endophlebitis of inferior sagittal sinus
- Endophlebitis of intracranial venous sinus
- Endophlebitis of lateral venous sinus
- Endophlebitis of superior sagittal sinus
- Endophlebitis of torcular Herophili
- Intracranial septic embolism
- Intracranial septic thrombophlebitis
- Intracranial thrombophlebitis
- Intracranial venous septic embolism
- Non-pyogenic venous sinus thrombosis
- Phlebitis cavernous sinus
- Phlebitis of basilar sinus
- Phlebitis of inferior sagittal sinus
- Phlebitis of intracranial venous sinus
- Phlebitis of lateral venous sinus
- Phlebitis of superior sagittal sinus
- Phlebitis of torcular Herophili
- Septic thrombophlebitis
- Septic thrombophlebitis of cavernous sinus
- Septic thrombophlebitis of cortical vein
- Septic thrombophlebitis of great cerebral vein
- Septic thrombophlebitis of lateral sinus
- Septic thrombophlebitis of sagittal sinus
- Septic thrombophlebitis of sigmoid sinus
- Septic thrombophlebitis of straight sinus
- Thrombophlebitis lateral venous sinus
- Thrombophlebitis of basal vein of Rosenthal
- Thrombophlebitis of basilar sinus
- Thrombophlebitis of cavernous sinus
- Thrombophlebitis of central nervous system venous sinuses
- Thrombophlebitis of cerebral vein
- Thrombophlebitis of inferior sagittal sinus
- Thrombophlebitis of internal cerebral vein
- Thrombophlebitis of intracranial venous sinus
- Thrombophlebitis of sigmoid sinus
- Thrombophlebitis of straight sinus
- Thrombophlebitis of superior anastomotic vein
- Thrombophlebitis of superior sagittal sinus
- Thrombophlebitis of torcular Herophili
- Thrombosis of basal vein
- Thrombosis of basilar sinus
- Thrombosis of cavernous venous sinus
- Thrombosis of cerebral medullary veins
- Thrombosis of cerebral venous sinus due to and following surgical procedure
- Thrombosis of inferior sagittal sinus
- Thrombosis of lateral venous sinus
- Thrombosis of superior anastomotic vein
- Thrombosis of superior sagittal sinus
- Thrombosis of torcular Herophili
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- 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
Type 1 Excludes
- intracranial phlebitis and thrombophlebitis complicating:
- abortion, ectopic or molar pregnancy O00 O07 O08.7
- pregnancy, childbirth and the puerperium O22.5 O87.3
- nonpyogenic intracranial phlebitis and thrombophlebitis I67.6
Type 2 Excludes
- intracranial phlebitis and thrombophlebitis complicating nonpyogenic intraspinal phlebitis and thrombophlebitis G95.1
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Embolism (multiple) (paradoxical) I74.9
intracranial See Also: Occlusion, artery, cerebral;
venous sinus G08
Inflammation, inflamed, inflammatory (with exudation)
vein See Also: Phlebitis;
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Brain Diseases
Your brain is the control center of your body. It controls your thoughts, memory, speech, and movement. It regulates the function of many organs. It's part of your nervous system, which also includes your spinal cord and peripheral nerves. The nervous system sends signals between your brain and the rest of the body.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert G08 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About G08Overview
What is the ICD-10 code for intracranial and intraspinal phlebitis and thrombophlebitis?
The ICD-10-CM code for intracranial and intraspinal phlebitis and thrombophlebitis is G08. It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is G08 (Intracranial and intraspinal phlebitis and thrombophlebitis) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report intracranial and intraspinal phlebitis and thrombophlebitis on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does G08 group to?
When intracranial and intraspinal phlebitis and thrombophlebitis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 23, 24, 91, 92, 93, with relative weights from 0.7963 to 5.7303 depending on complications. Higher weights mean higher Medicare reimbursement.
Is G08 a CC or MCC?
CMS lists G08 as an MCC (major complication or comorbidity) for FY 2026. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 72 closely related codes in its exclusion list.
What is the ICD-9 equivalent of G08?
Under the General Equivalence Mappings, intracranial and intraspinal phlebitis and thrombophlebitis converts to ICD-9-CM 325 (phlebitis intrcran sinus). The mapping is a direct match.
