T75.00 ICD-10-CM Code: Unspecified effects of lightning

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for T75.00 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 T75.00 itself; “inherited from” names the category or block whose note applies here.

7th Character Guide

"The appropriate 7th character is to be added to each code from category T75"

• 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

T75.00XA, T75.00XD, T75.00XS

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 T75.00

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

Before you code T75.00

1. T75.00 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).

   ReviewT75.00XA, T75.00XD, T75.00XS

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

2. Unspecified does not mean incorrect. When the record gives no greater specificity, T75.00 may be the appropriate code. Check the record for detail that supports a more specific sibling. An unspecified code is for records that do not provide the detail a more specific code needs; a query, not an assumption, is the route to specificity (Guidelines I.A.9.b, I.B.18).

   ReviewT75.01, T75.09

   See the relationships section · Guide: Other vs unspecified (NEC vs NOS) →

3. A 7th character is required in this family. Confirm the documented encounter: initial (active treatment), subsequent (healing or recovery phase), or sequela. T75.00 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 →

4. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with T75.00. 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 T75.00?
   Yes → Select that code and continue the checks below on its own page.
   No → T75.00 cannot be reported as written; query for the specificity its subcategory needs.

   ReviewT75.00XA, T75.00XD, T75.00XS

2. Does the record document the detail a more specific sibling code needs?
   Yes → Review the specific siblings in this subcategory.
   No → Continue — T75.00 is appropriate when the documentation goes no further.

   ReviewT75.01, T75.09

3. Does the documentation support a condition named in T75.00’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.

   ReviewT78

4. 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 T75.00. Then review the Code Also note, and 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).

Any detail beyond this code’s title

What the record states that a more specific sibling code would capture — or its absence, which itself supports the unspecified code.

Official instructions as workflow

• Excludes1 — check before selecting T75.00(1 note)

  Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with T75.00: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

  CompareT78

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

• Excludes2 — not part of T75.00(1 note)

  Coding workflow: The conditions named in this note are not included in T75.00. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

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

• Code Also — related condition(6 notes)

  Coding workflow: Review the related condition when both are documented and the instruction applies. A Code Also note does not fix sequencing; the order follows the circumstances of the encounter.

  ReviewY92.523, Y92.21, Y92.52, Y92.01, Y92.81

  See the official tabular notes · Guidelines I.A.17

Coding decision scenarios

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

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.

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.

• Lightning (effects) (stroke) (struck by)

Don’t confuse T75.00 with…

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

The codes most likely to be picked instead of T75.00 — 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.

• T78— 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 adverse effects NEC moves the case to T78; the two are not reported together unless documented as unrelated.

  Full comparison: T75.00 vs T78 →

• T75.00XA— Encounter relationship (Review)

  Same underlying diagnosis, different encounter phase.

  The same diagnosis at a different phase of care; one encounter takes one 7th character.

  What moves you there: Documentation of a initial encounter moves the case to T75.00XA.

  Full comparison: T75.00 vs T75.00XA →

• T75.00XD— Encounter relationship (Review)

  Same underlying diagnosis, different encounter phase.

  The same diagnosis at a different phase of care; one encounter takes one 7th character.

  What moves you there: Documentation of a subsequent encounter moves the case to T75.00XD.

  Full comparison: T75.00 vs T75.00XD →

• T20— Excludes2 relationship (Informational)

  Distinct conditions — both may be reported.

  A distinct condition — both may be reported when both are documented.

  What moves you there: Documentation of burns (electric) adds T20; it is not part of this code and both may be reported when both are documented.

  Full comparison: T75.00 vs T20 →

• T31— Excludes2 relationship (Informational)

  Distinct conditions — both may be reported.

  A distinct condition — both may be reported when both are documented.

  What moves you there: Documentation of burns (electric) adds T31; it is not part of this code and both may be reported when both are documented.

  Full comparison: T75.00 vs T31 →

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.

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. 6 Code Also notes — a second code may apply; the guidelines leave its sequencing to the circumstances of the encounter. See the Code Also notes
3. 1 Excludes1 entry — codes named there are generally not reported together with this code (Guidelines I.A.12.a). See the Excludes1 notes
4. 1 Excludes2 entry — 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

• Not billable as written — a more specific code is required: T75.00XA, T75.00XD, T75.00XS.
• Requires a 7th character. "The appropriate 7th character is to be added to each code from category T75" Options: T75.00XA, T75.00XD, T75.00XS

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 T75.00 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 10 Excludes1 notes: W85 — Exposure to electric transmission lines (via T75.0.-), W85-W99 — Exposure to electric current, radiation and extreme ambient air temperature and pressure (W85-W99) (via T75.0.-), W86 — Exposure to other specified electric current (via T75.0.-), W88 — Exposure to ionizing radiation (via T75.0.-), W89 — Exposure to man-made visible and ultraviolet light (via T75.0.-), W90 — Exposure to other nonionizing radiation (via T75.0.-), W92 — Exposure to excessive heat of man-made origin (via T75.0.-), W93 — Exposure to excessive cold of man-made origin (via T75.0.-), W94 — Exposure to high and low air pressure and changes in air pressure (via T75.0.-), W99 — Exposure to other man-made environmental factors (via T75.0.-).

These codes’ tabular lists mark this diagnosis as mutually exclusive — not reported together unless the conditions are documented as unrelated.

Referenced by 9 Excludes2 notes: X00 — Exposure to uncontrolled fire in building or structure (via T75.0.-), X00-X08 — Exposure to smoke, fire and flames (X00-X08) (via T75.0.-), X01 — Exposure to uncontrolled fire, not in building or structure (via T75.0.-), X02 — Exposure to controlled fire in building or structure (via T75.0.-), X03 — Exposure to controlled fire, not in building or structure (via T75.0.-), X04 — Exposure to ignition of highly flammable material (via T75.0.-), X05 — Exposure to ignition or melting of nightwear (via T75.0.-), X06 — Exposure to ignition or melting of other clothing and apparel (via T75.0.-), X08 — Exposure to other specified smoke, fire and flames (via T75.0.-).

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

Referenced by 1 Code First instruction: W20 — Struck by thrown, projected or falling object.

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 “Lightning”; these codes share that main term but sit in a different category of the Tabular List.

E53.8 — Deficiency of other specified B group vitamins

Contextual Map

Every relationship of T75.00 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 T75.00 with these 17 related codes in Claim Check

Hierarchy

• S00-T88 — Chapter 19: Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) (S00-T88)[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Referenced by Excludes1 notes (10)

• W85 — Exposure to electric transmission lines[Excludes1](via T75.0.-): “lightning (T75.0-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• W85-W99 — Exposure to electric current, radiation and extreme ambient air temperature and pressure (W85-W99)[Excludes1](via T75.0.-): “lightning (T75.0-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• W86 — Exposure to other specified electric current[Excludes1](via T75.0.-): “lightning (T75.0-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• W88 — Exposure to ionizing radiation[Excludes1](via T75.0.-): “lightning (T75.0-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• W89 — Exposure to man-made visible and ultraviolet light[Excludes1](via T75.0.-): “lightning (T75.0-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• W90 — Exposure to other nonionizing radiation[Excludes1](via T75.0.-): “lightning (T75.0-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• W92 — Exposure to excessive heat of man-made origin[Excludes1](via T75.0.-): “lightning (T75.0-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• W93 — Exposure to excessive cold of man-made origin[Excludes1](via T75.0.-): “lightning (T75.0-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• and 2 more

Referenced by Excludes2 notes (9)

• X00 — Exposure to uncontrolled fire in building or structure[Excludes2](via T75.0.-): “lightning (T75.0-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• X00-X08 — Exposure to smoke, fire and flames (X00-X08)[Excludes2](via T75.0.-): “lightning (T75.0-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• X01 — Exposure to uncontrolled fire, not in building or structure[Excludes2](via T75.0.-): “lightning (T75.0-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• X02 — Exposure to controlled fire in building or structure[Excludes2](via T75.0.-): “lightning (T75.0-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• X03 — Exposure to controlled fire, not in building or structure[Excludes2](via T75.0.-): “lightning (T75.0-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• X04 — Exposure to ignition of highly flammable material[Excludes2](via T75.0.-): “lightning (T75.0-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• X05 — Exposure to ignition or melting of nightwear[Excludes2](via T75.0.-): “lightning (T75.0-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• X06 — Exposure to ignition or melting of other clothing and apparel[Excludes2](via T75.0.-): “lightning (T75.0-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• and 1 more

Referenced by Code First instructions

• W20 — Struck by thrown, projected or falling object[Code First]: “lightning strike (T75.00)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Index entries

• Lightning (effects) (stroke) (struck by)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes (40)

• T75 — Other and unspecified effects of other external causes[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• T75.0 — Effects of lightning[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• T75.00XA — Unspecified effects of lightning, initial encounter[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• T75.00XD — Unspecified effects of lightning, subsequent encounter[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• T75.00XS — Unspecified effects of lightning, sequela[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• T75.01 — Shock due to being struck by lightning[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• T75.01XA — Shock due to being struck by lightning, initial encounter[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• T75.01XD — Shock due to being struck by lightning, subsequent encounter[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• and 32 more

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

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

Nearest Codes in This Family

Official ICD-10-CM classifications closest to T75.00 in its code family, with their registry titles.

• T75 — Other and unspecified effects of other external causes
• T75.0 — Effects of lightning
• T75.00XA — Unspecified effects of lightning, initial encounter
• T75.00XD — Unspecified effects of lightning, subsequent encounter
• T75.00XS — Unspecified effects of lightning, sequela
• T75.01 — Shock due to being struck by lightning
• T75.01XA — Shock due to being struck by lightning, initial encounter
• T75.01XD — Shock due to being struck by lightning, subsequent encounter
• T75.01XS — Shock due to being struck by lightning, sequela
• T75.09 — Other effects of lightning

View all codes in the T75 family