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G08 ICD-10-CM Code: Intracranial and intraspinal phlebitis and thrombophlebitis

Compare with another code for G08Check this code on a claim

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Coding at a Glance

Tabular directives
5 inclusion terms · 4 Excludes1 · 1 Excludes2

Billable · FY2027A valid, specific ICD-10-CM code, reportable for dates of service in FY2027.

What you need to know

Source: CMS/NCHS Official ICD-10-CM tabular notes, quoted. From the CMS/NCHS tabular list for the release in force. A note the category or block publishes applies to this code too, and is marked with where it comes from.

Excludes1Not reported with this code unless documented as unrelated
  • 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
  • intracranial phlebitis and thrombophlebitis complicating nonpyogenic intraspinal phlebitis and thrombophlebitis (G95.1)
IncludesWhat this code covers
  • 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

+1 more in Instructions

Where it sits Source: CMS/NCHS

Under:Chapter 6: Diseases of the Nervous SystemG00-G09 Inflammatory diseases of the central nervous system

Most relevant related codes MedCoder-derived

Read off the official notes above and this code’s own position in the tabular list. Which to report is a documentation question; Compare shows the two side by side.

CompareCheck ClaimView Related Codes

Inpatient Payment Groups (MS-DRG)

Potential MS-DRG participation — not a DRG assignment.

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v44, Appendix B.

  • MS-DRG 023 — CRANIOTOMY WITH MAJOR DEVICE IMPLANT OR ACUTE COMPLEX CNS PRINCIPAL DIAGNOSIS WITH MCC OR ANTINEOPLASTIC IMPLANT OR EPILEPSY WITH NEUROSTIMULATOR (MDC 01)
  • MS-DRG 024 — CRANIOTOMY WITH MAJOR DEVICE IMPLANT OR ACUTE COMPLEX CNS PRINCIPAL DIAGNOSIS WITHOUT MCC (MDC 01)
  • MS-DRG 091 — OTHER DISORDERS OF NERVOUS SYSTEM WITH MCC (MDC 01)
  • MS-DRG 092 — OTHER DISORDERS OF NERVOUS SYSTEM WITH CC (MDC 01)
  • MS-DRG 093 — OTHER DISORDERS OF NERVOUS SYSTEM WITHOUT CC/MCC (MDC 01)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for G08 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2027Effective: October 1, 2026

Trace:FY2027 changesChange historyRelease, file and checksum

Inclusion Terms

Alternative terms the tabular list files under 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

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

Coder workflow for G08

MedCoder structured workflow — derived from this code’s own official record

Before you code G08

  1. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with G08. Excludes1 conditions are not reported together with this code unless the record shows they are unrelated (Guidelines I.A.12.a).

    See the official tabular notes

Choose the right path

  1. Does the documentation support a condition named in G08’s Excludes1 note?
    Yes → Do not simply proceed: review the excluded code. Both are reported only when the record shows the two conditions are unrelated.
    No → Continue.

    ReviewO08.7, O22.5, O87.3, I67.6

Consider G08. Then confirm the code is valid for the date of service in the Verify section.

Documentation check

The provider’s diagnostic statement
Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).

Official instructions as workflow

  • Excludes1 — check before selecting G08(4 notes)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with G08: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    CompareO08.7, O22.5, O87.3, I67.6

    See the official tabular notes · Guidelines I.A.12.a

  • Excludes2 — not part of G08(1 note)

    Coding workflow: The conditions named in this note are not included in G08. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

    CompareG95.1

    See the official tabular notes · Guidelines I.A.12.b

Coding decision scenarios

Pattern scenarios for this code’s structure — decision rules, not clinical cases

Documentation: Both the condition G08 describes and a condition named in its Excludes1 note are documented for the same encounter.

Coding question: Can both codes be reported?

Path: Review the Excludes1 note and the excluded code, and look for a provider statement on whether the two conditions are related.

Reason: Excludes1 means the two are not coded together; the exception is when the record shows the conditions are unrelated to each other (Guidelines I.A.12.a).

ReviewO08.7, O22.5, O87.3, I67.6

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Don’t confuse G08 with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of G08 — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

  • O00— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of abortion, ectopic or molar pregnancy moves the case to O00; the two are not reported together unless documented as unrelated.

    Full comparison: G08 vs O00 →

  • O07— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of abortion, ectopic or molar pregnancy moves the case to O07; the two are not reported together unless documented as unrelated.

    Full comparison: G08 vs O07 →

  • O08.7— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of abortion, ectopic or molar pregnancy moves the case to O08.7; the two are not reported together unless documented as unrelated.

    Full comparison: G08 vs O08.7 →

  • O22.5— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of pregnancy, childbirth and the puerperium moves the case to O22.5; the two are not reported together unless documented as unrelated.

    Full comparison: G08 vs O22.5 →

  • O87.3— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of pregnancy, childbirth and the puerperium moves the case to O87.3; the two are not reported together unless documented as unrelated.

    Full comparison: G08 vs O87.3 →

  • I67.6— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of nonpyogenic intracranial phlebitis and thrombophlebitis moves the case to I67.6; the two are not reported together unless documented as unrelated.

    Full comparison: G08 vs I67.6 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Coding context

Guidelines, coding notes, decision aids, relationships (with MS-DRG and CCSR classification), hierarchy, HCC, coverage and the context map: what a coder reaches for after the core. Each section names whether it is official source data, a MedCoder-derived relationship or MedCoder editorial.

Code Overview

Intracranial and intraspinal phlebitis and thrombophlebitis is a billable ICD-10-CM diagnosis code (G08).

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Verify Before Coding

  • MCC as a secondary diagnosis (FY2027). Can raise the stay's MS-DRG severity tier.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder-derived relationships — computed from published CMS and AHRQ datasets

Other codes that name G08 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 2 Excludes2 notes across 2 chapters: G95.1 — Vascular myelopathies, I82 — Other venous embolism and thrombosis.

These codes’ tabular lists name this diagnosis as distinct — both may be reported when both are documented.

MS-DRG Grouper Relationships (FY2027)

Potential MS-DRG participation — not a DRG assignment.

FY2027 MS-DRG: MCC — Major Complication or Comorbidity. Reported as a secondary diagnosis, this code raises the stay's MS-DRG severity tier — except when the principal diagnosis is one of 72 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 5 MS-DRGs: DRG 023 (MDC 01), DRG 024 (MDC 01), DRG 091 (MDC 01), DRG 092 (MDC 01), DRG 093 (MDC 01).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):NVS020 — Other nervous system disorders (neither hereditary nor degenerative) (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same clinical process (MS-DRG)

Acts as MCC — raises the severity of other admissions. CMS groups these diagnoses into one MS-DRG principal-diagnosis exclusion process — a CC/MCC on this list never raises severity when the principal diagnosis is also on it.

E13.40 — Other specified diabetes mellitus with diabetic neuropathy, unspecified, E13.41 — Other specified diabetes mellitus with diabetic mononeuropathy, E13.42 — Other specified diabetes mellitus with diabetic polyneuropathy, E13.43 — Other specified diabetes mellitus with diabetic autonomic (poly)neuropathy, E13.44 — Other specified diabetes mellitus with diabetic amyotrophy, E13.49 — Other specified diabetes mellitus with other diabetic neurological complication, E13.618 — Other specified diabetes mellitus with other diabetic arthropathy, E13.620 — Other specified diabetes mellitus with diabetic dermatitis, E13.621 — Other specified diabetes mellitus with foot ulcer, E13.622 — Other specified diabetes mellitus with other skin ulcer, E13.628 — Other specified diabetes mellitus with other skin complications, E13.630 — Other specified diabetes mellitus with periodontal disease, E13.638 — Other specified diabetes mellitus with other oral complications, E13.649 — Other specified diabetes mellitus with hypoglycemia without coma, E13.65 — Other specified diabetes mellitus with hyperglycemia, E13.69 — Other specified diabetes mellitus with other specified complication, E13.8 — Other specified diabetes mellitus with unspecified complications, G06.0 — Intracranial abscess and granuloma, G06.1 — Intraspinal abscess and granuloma, G06.2 — Extradural and subdural abscess, unspecified, +51 more

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Other nervous system disorders (neither hereditary nor degenerative)).

E08.40 — Diabetes mellitus due to underlying condition with diabetic neuropathy, unspecified, E08.44 — Diabetes mellitus due to underlying condition with diabetic amyotrophy, E09.40 — Drug or chemical induced diabetes mellitus with neurological complications with diabetic neuropathy, unspecified, E09.44 — Drug or chemical induced diabetes mellitus with neurological complications with diabetic amyotrophy, E10.40 — Type 1 diabetes mellitus with diabetic neuropathy, unspecified, E10.44 — Type 1 diabetes mellitus with diabetic amyotrophy, E11.40 — Type 2 diabetes mellitus with diabetic neuropathy, unspecified, E11.44 — Type 2 diabetes mellitus with diabetic amyotrophy, E13.40 — Other specified diabetes mellitus with diabetic neuropathy, unspecified, E13.44 — Other specified diabetes mellitus with diabetic amyotrophy, G13.0 — Paraneoplastic neuromyopathy and neuropathy, G13.1 — Other systemic atrophy primarily affecting central nervous system in neoplastic disease, G13.2 — Systemic atrophy primarily affecting the central nervous system in myxedema, G13.8 — Systemic atrophy primarily affecting central nervous system in other diseases classified elsewhere, G36.0 — Neuromyelitis optica [Devic], G36.1 — Acute and subacute hemorrhagic leukoencephalitis [Hurst], G36.8 — Other specified acute disseminated demyelination, G36.9 — Acute disseminated demyelination, unspecified, G37.0 — Diffuse sclerosis of central nervous system, G37.1 — Central demyelination of corpus callosum, +97 more

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main terms “Thrombophlebitis”, “Thrombosis, thrombotic”, “Embolism”, …; these codes share that main term but sit in a different category of the Tabular List.

A52.05 — Other cerebrovascular syphilis (brain, due to syphilis), A52.06 — Other syphilitic heart involvement (mural, due to syphilis), A52.09 — Other cardiovascular syphilis (syphilitic), D73.5 — Infarction of spleen (spleen, splenic), D73.89 — Other diseases of spleen (spleen), E23.6 — Other disorders of pituitary gland (pituitary), E27.8 — Other specified disorders of adrenal gland (adrenal), E32.8 — Other diseases of thymus (thymus), E54 — Ascorbic acid deficiency (scorbutic, alveoli, teeth), G06.1 — Intraspinal abscess and granuloma (spinal cord, pyogenic origin), G09 — Sequelae of inflammatory diseases of central nervous system (cerebral, sequelae), G95.11 — Acute infarction of spinal cord (embolic) (nonembolic) (spinal cord), G95.19 — Other vascular myelopathies (spinal cord), H01.8 — Other specified inflammations of eyelid (eyelid, specified NEC), H01.9 — Unspecified inflammation of eyelid (eyelid), H05.00 — Unspecified acute inflammation of orbit (orbit, acute), H05.10 — Unspecified chronic inflammatory disorders of orbit (orbit), H30.00 — Unspecified focal chorioretinal inflammation (chorioretinal, focal), H30.01 — Focal chorioretinal inflammation, juxtapapillary (chorioretinal, focal, juxtapapillary), H30.02 — Focal chorioretinal inflammation of posterior pole (chorioretinal, focal, posterior pole), +235 more

Lab tests where this diagnosis supports Medicare coverage (NCD)

Medicare's National Coverage Determination (NCD) program lists this diagnosis as medical justification for these lab tests.

Partial Thromboplastin Time (PTT) Test, Prothrombin Time Test and INR (PT/INR)

Contextual Map

Every relationship of G08 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run G08 with these 10 related codes in Claim Check

Hierarchy

Excludes1 (10)

Excludes2

  • G95.1 — Vascular myelopathies[Excludes2]: “intracranial phlebitis and thrombophlebitis complicating nonpyogenic intraspinal phlebitis and thrombophlebitis (G95.1)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027

Referenced by Excludes2 notes

Clinical classification (CCSR)

MS-DRG Grouper

MDC crossing

  • MDC 01 — Diseases and Disorders of the Nervous System[MDC crossing]: “Diseases and Disorders of the Nervous System — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 8,919 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2027

Index entries (14)

  • Embolism (multiple) (paradoxical), intracranial, venous sinus (any)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Embolism (multiple) (paradoxical), intraspinal venous sinuses or veins[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Embolism (multiple) (paradoxical), venous sinus[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Inflammation, inflamed, inflammatory (with exudation), vein, intracranial or intraspinal (septic)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Phlebitis (infective) (pyemic) (septic) (suppurative), intracranial (venous) sinus (any)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Phlebitis (infective) (pyemic) (septic) (suppurative), intraspinal venous sinuses and veins[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Thrombophlebitis, cavernoussinus (venous)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Thrombophlebitis, cerebral (sinus) (vein)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • and 6 more

Change history

  • FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Reference

Index terms and tables, published questions and FAQ, every source behind this page with its release and checksum, the date-of-service check and the complete change history.

Indexed Clinical Terms (14)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2027 tabular list, index and tables, effective October 1, 2026 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v44.0 (October 2026) Release, file and checksum · Publisher’s page
Inpatient payment groups Official source data
CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v44 Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder-derived relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder editorial explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources

Labels on this page: Official source data · MedCoder-derived relationship · MedCoder editorial explanation. How to read the labels · All data sources and release dates · CMS coding rules

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "G08 — Intracranial and intraspinal phlebitis and thrombophlebitis." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/g08-intracranial-and-intraspinal-phlebitis-and-thrombophlebitis

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Intracranial and intraspinal phlebitis and thrombophlebitis

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027, and none are recorded for this code. Note changes are tracked from FY2027 only.