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T79.1 ICD-10-CM Code: Fat embolism (traumatic)

Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.

Coding at a Glance

7th character
Required — see the character table on this page
Tabular directives
3 Excludes1 · 4 Excludes2

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for T79.1 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2026Effective: October 1, 2025

Notes without a marker are published on T79.1 itself; “inherited from” names the category or block whose note applies here.

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.

Source: inherited from T79

7th Character Guide

"The appropriate 7th character is to be added to each code from category T79"

  • A — initial encounter
  • D — subsequent encounter
  • S — sequela

How the encounter character is assigned. “Initial encounter” means the patient is receiving active treatment for the condition — it is not limited to the first visit, and a different or new provider giving active treatment still assigns it. “Subsequent encounter” covers care during the healing or recovery phase after active treatment. “Sequela” is for complications or conditions that arise as a direct result of the original condition.

ICD-10-CM Official Guidelines for Coding and Reporting, Section I.C.19.a (paraphrased by MedCoder).

Variant codes in this family

T79.1XXA, T79.1XXD, T79.1XXS

Character meanings are CMS's official 7th-character extensions for this family, as carried in each variant code's official description; variant codes are registry rows. The explanation of how the encounter character is assigned is MedCoder editorial, distinct from the official content above it.

Coder workflow for T79.1

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

Before you code T79.1

  1. T79.1 is not reportable as written. Select the more specific code beneath it that the documentation supports. Codes are reported to the highest level of specificity the classification provides (Guidelines I.B.2).

    ReviewT79.1XXA, T79.1XXD, T79.1XXS

    See the relationships section · Guide: How to choose an ICD-10-CM code →

  2. A 7th character is required in this family. Confirm the documented encounter: initial (active treatment), subsequent (healing or recovery phase), or sequela. T79.1 is not valid without one. “Initial” means active treatment, not the first visit (Guidelines I.C.19.a).

    See the 7th Character Guide · Guide: 7th characters: initial, subsequent, sequela →

  3. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with T79.1. 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 one of the more specific codes beneath T79.1?
    Yes → Select that code and continue the checks below on its own page.
    No → T79.1 cannot be reported as written; query for the specificity its subcategory needs.

    ReviewT79.1XXA, T79.1XXD, T79.1XXS

  2. Does the documentation support a condition named in T79.1’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.

    ReviewO08.2, O88.8

  3. Is the encounter phase documented — active treatment, healing or recovery, or a sequela?
    Yes → Assign the matching 7th character; the variant codes are in the 7th Character Guide.
    No → The code is invalid without its 7th character — query for the missing element.

Consider T79.1. 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).
Encounter type
Active treatment, healing or recovery phase, or sequela — the basis of the 7th character (Guidelines I.C.19.a).

Official instructions as workflow

  • Excludes1 — check before selecting T79.1(3 notes)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with T79.1: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    CompareO08.2, O88.8

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

  • Excludes2 — not part of T79.1(4 notes)

    Coding workflow: The conditions named in this note are not included in T79.1. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

    CompareJ80, P22.0

    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 T79.1 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).

ReviewO08.2, O88.8

Documentation: The patient returns during the healing or recovery phase after active treatment of the same condition.

Coding question: Which 7th character applies?

Path: Review the official 7th-character definitions for this family in the 7th Character Guide.

Reason: “Initial encounter” means active treatment, not the first visit; care during recovery takes “subsequent encounter”, and a complication arising from the original condition takes “sequela” (Guidelines I.C.19.a).

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.

Code Overview

Fat embolism (traumatic) is a non-billable ICD-10-CM category code (T79.1). A more specific billable subcode must be selected for claims submission.

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

Indexed Clinical Terms (1)

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.

Decision Points

The directives on this code's own record, as a pre-claim checklist.

  1. A 7th character applies in this family. Confirm the documented encounter matches the character assigned. See the official 7th-character definitions and this code’s variants
  2. 3 Excludes1 entries — codes named there are generally not reported together with this code (Guidelines I.A.12.a). See the Excludes1 notes
  3. 4 Excludes2 entries — those conditions are not part of this code and may be reported additionally when documented. See the Excludes2 notes

Checklist rows are derived from this code's own official directives; the wording of each check is MedCoder editorial. The official notes themselves are in the sections each row links to.

Verify Before Coding

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 structured relationships — computed from published CMS and AHRQ datasets

Other codes that name T79.1 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 1 Excludes2 note: I26 — Pulmonary embolism.

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

Referenced by 2 Code First instructions: I26.04 — Fat embolism of pulmonary artery with acute cor pulmonale, I26.96 — Fat embolism of pulmonary artery without acute cor pulmonale.

Each of these codes carries a Code First note naming this condition — when that code is reported, THIS code is sequenced first, ahead of it.

Related Codes

Same Index main term, other category

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

O88.13 — Amniotic fluid embolism in the puerperium (obstetric, puerperal, amniotic fluid), O88.21 — Thromboembolism in pregnancy (obstetric, pregnancy), O88.22 — Thromboembolism in childbirth (obstetric, childbirth), O88.23 — Thromboembolism in the puerperium (obstetric, puerperal), O88.31 — Pyemic and septic embolism in pregnancy (obstetric, pregnancy, pyemic), O88.32 — Pyemic and septic embolism in childbirth (obstetric, childbirth, pyemic), O88.33 — Pyemic and septic embolism in the puerperium (obstetric, puerperal, pyemic), O88.81 — Other embolism in pregnancy (obstetric, pregnancy, fat), O88.82 — Other embolism in childbirth (obstetric, childbirth, fat), O88.83 — Other embolism in the puerperium (obstetric, puerperal, fat), T80.0 — Air embolism following infusion, transfusion and therapeutic injection (following, infusion, therapeutic injection or transfusion, air), T81.710 — Complication of mesenteric artery following a procedure, not elsewhere classified (postoperative, postprocedural, artery, mesenteric), T81.711 — Complication of renal artery following a procedure, not elsewhere classified (air, following, procedure NEC, artery, renal), T81.718 — Complication of other artery following a procedure, not elsewhere classified (postoperative, postprocedural, artery, specified NEC), T81.719 — Complication of unspecified artery following a procedure, not elsewhere classified (postoperative, postprocedural, artery), T81.72 — Complication of vein following a procedure, not elsewhere classified (air, following, procedure NEC, vein), T82.817 — Embolism due to cardiac prosthetic devices, implants and grafts (due to device, implant or graft, heart), T82.818 — Embolism due to vascular prosthetic devices, implants and grafts (due to device, implant or graft, vascular NEC), T83.81 — Embolism due to genitourinary prosthetic devices, implants and grafts (due to device, implant or graft, urinary NEC), T84.81 — Embolism due to internal orthopedic prosthetic devices, implants and grafts (due to device, implant or graft, electronic, bone), +103 more

Contextual Map

Every relationship of T79.1 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 T79.1 with these 11 related codes in Claim Check

Hierarchy

Excludes1

Referenced by Excludes2 notes

  • I26 — Pulmonary embolism[Excludes2]: “pulmonary embolism due to trauma (T79.0, T79.1)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Code First instructions

Index entries

  • Embolism (multiple) (paradoxical), fat (cerebral) (pulmonary) (systemic)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes (40)

Change history

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

Common coding questions

Can T79.1 be billed directly?

No. T79.1 (Fat embolism (traumatic)) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.

Does T79.1 require a 7th character?

Yes. The appropriate 7th character is to be added to each code from category T79.

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 FY2026 tabular list, index and tables, effective October 1, 2025 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v43.1 (April 2026) 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 structured 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 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.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Fat embolism (traumatic)

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027 (effective October 1, 2026), and none are recorded for this code. Note changes are tracked from FY2027 only.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to T79.1 in its code family, with their registry titles.

View all codes in the T79 family