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ICD-10-CM 2027 diagnosis code

G08Intracranial and intraspinal phlebitis and thrombophlebitis

✓ Billable / specificMCC — major complication/comorbidity

G08 is a valid, billable ICD-10-CM code for intracranial and intraspinal phlebitis and thrombophlebitis. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Looking up by condition? See ICD-10 code for Cerebral thrombophlebitis, ICD-10 code for Cavernous sinus thrombophlebitis.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About G08

G08 is the ICD-10-CM diagnosis code for intracranial and intraspinal phlebitis and thrombophlebitis. It belongs to block G00-G09 (inflammatory diseases of the central nervous system) and chapter 6 (diseases of the nervous system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Don't report G08 together with the conditions in its Excludes1 note: abortion, ectopic or molar pregnancy (O00-O07, O08.7), pregnancy, childbirth and the puerperium (O22.5, O87.3) and nonpyogenic intracranial phlebitis and thrombophlebitis (I67.6).

The conditions in its Excludes2 note aren't part of G08, but may be coded alongside it if the patient has both: intracranial phlebitis and thrombophlebitis complicating nonpyogenic intraspinal phlebitis and thrombophlebitis (G95.1).

As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 023 (Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis with MCC or Antineoplastic Implant or Epilepsy with Neurostimulator, relative weight 5.7444), DRG 024 (Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis without MCC, relative weight 3.9708), DRG 091 (Other Disorders of Nervous System with MCC, relative weight 1.7046), DRG 092 (Other Disorders of Nervous System with CC, relative weight 1.0239) and DRG 093 (Other Disorders of Nervous System without CC/MCC, relative weight 0.7783), in MDC 01 (Diseases and Disorders of the Nervous System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 325 (phlebitis and thrombophlebitis of intracranial venous sinuses).

Coding notes

Applicable toConditions and synonyms classified to this code
  • 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
Excludes1Not coded here — never report together with this code
  • 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)
Excludes2Not included here — may be reported together if both conditions exist
  • intracranial phlebitis and thrombophlebitis complicating nonpyogenic intraspinal phlebitis and thrombophlebitis (G95.1)

Notes that apply from higher levels

Instructions written at a parent level also apply to G08.

Broader instructions also apply from Chapter 6: Diseases of the nervous system.

Alphabetic index entries

14 entries

Terms in the official ICD-10-CM index that lead to G08.

Codes whose notes reference G08

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 325Phlebitis and thrombophlebitis of intracranial venous sinusesexact

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about G08

Is G08 billable?

Yes. G08 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can G08 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict G08 as a principal diagnosis.

Is G08 a CC or MCC?

G08 is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does G08 group to?

G08 is used in the MS-DRG v44.0 logic for MS-DRG 023 (Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis with MCC or Antineoplastic Implant or Epilepsy with Neurostimulator), MS-DRG 024 (Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis without MCC), MS-DRG 091 (Other Disorders of Nervous System with MCC), MS-DRG 092 (Other Disorders of Nervous System with CC) and MS-DRG 093 (Other Disorders of Nervous System without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for G08?

The CMS General Equivalence Mappings map G08 to ICD-9-CM 325.