Other and unspecified effects of other external causes (T75) ICD-10-CM
The T75 code range covers other and unspecified effects of other external causes with 69 ICD-10-CM diagnosis codes. 48 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
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.
- adverse effects NEC T78
Type 2 Excludes
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.
7th Character Note
Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.
- The appropriate 7th character is to be added to each code from category T75
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
- A - initial encounter
- D - subsequent encounter
- S - sequela
Codes in the T75 Range 69 codes · 48 billable
- T75 Other and unspecified effects of other external causesNon-billable
- T75.0 Effects of lightningNon-billable
- T75.00 Unspecified effects of lightningNon-billable
- 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 lightningNon-billable
- 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 lightningNon-billable
- T75.09XA Other effects of lightning, initial encounter
- T75.09XD Other effects of lightning, subsequent encounter
- T75.09XS Other effects of lightning, sequela
- T75.1 Unspecified effects of drowning and nonfatal submersionNon-billable
- T75.1XXA Unspecified effects of drowning and nonfatal submersion, initial encounter
- T75.1XXD Unspecified effects of drowning and nonfatal submersion, subsequent encounter
- T75.1XXS Unspecified effects of drowning and nonfatal submersion, sequela
- T75.2 Effects of vibrationNon-billable
- T75.20 Unspecified effects of vibrationNon-billable
- T75.20XA Unspecified effects of vibration, initial encounter
- T75.20XD Unspecified effects of vibration, subsequent encounter
- T75.20XS Unspecified effects of vibration, sequela
- T75.21 Pneumatic hammer syndromeNon-billable
- T75.21XA Pneumatic hammer syndrome, initial encounter
- T75.21XD Pneumatic hammer syndrome, subsequent encounter
- T75.21XS Pneumatic hammer syndrome, sequela
- T75.22 Traumatic vasospastic syndromeNon-billable
- T75.22XA Traumatic vasospastic syndrome, initial encounter
- T75.22XD Traumatic vasospastic syndrome, subsequent encounter
- T75.22XS Traumatic vasospastic syndrome, sequela
- T75.23 Vertigo from infrasoundNon-billable
- T75.23XA Vertigo from infrasound, initial encounter
- T75.23XD Vertigo from infrasound, subsequent encounter
- T75.23XS Vertigo from infrasound, sequela
- T75.29 Other effects of vibrationNon-billable
- T75.29XA Other effects of vibration, initial encounter
- T75.29XD Other effects of vibration, subsequent encounter
- T75.29XS Other effects of vibration, sequela
- T75.3 Motion sicknessNon-billable
- T75.3XXA Motion sickness, initial encounter
- T75.3XXD Motion sickness, subsequent encounter
- T75.3XXS Motion sickness, sequela
- T75.4 ElectrocutionNon-billable
- T75.4XXA Electrocution, initial encounter
- T75.4XXD Electrocution, subsequent encounter
- T75.4XXS Electrocution, sequela
- T75.8 Other specified effects of external causesNon-billable
- T75.81 Effects of abnormal gravitation [G] forcesNon-billable
- T75.81XA Effects of abnormal gravitation [G] forces, initial encounter
- T75.81XD Effects of abnormal gravitation [G] forces, subsequent encounter
- T75.81XS Effects of abnormal gravitation [G] forces, sequela
- T75.82 Effects of weightlessnessNon-billable
- T75.82XA Effects of weightlessness, initial encounter
- T75.82XD Effects of weightlessness, subsequent encounter
- T75.82XS Effects of weightlessness, sequela
- T75.83 Effects of war theaterNon-billable
- T75.830 Gulf war illnessNon-billable
- T75.830A Gulf war illness, initial encounter New
- T75.830D Gulf war illness, subsequent encounter New
- T75.830S Gulf war illness, sequela New
- T75.838 Effects of other war theaterNon-billable
- T75.838A Effects of other war theater, initial encounter New
- T75.838D Effects of other war theater, subsequent encounter New
- T75.838S Effects of other war theater, sequela New
- T75.89 Other specified effects of external causesNon-billable
- T75.89XA Other specified effects of external causes, initial encounter
- T75.89XD Other specified effects of external causes, subsequent encounter
- T75.89XS Other specified effects of external causes, sequela
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the T75 range.
Atmosphere
The gaseous envelope surrounding a planet or similar body. (From Random House Unabridged Dictionary, 2d ed)
Epilepsy, Reflex
A subtype of epilepsy characterized by seizures that are consistently provoked by a certain specific stimulus. Auditory, visual, and somatosensory stimuli as well as the acts of writing, reading, eating, and decision making are examples of events or activities that may induce seizure activity in affected individuals. (From Neurol Clin 1994 Feb;12(1):57-8)
Immersion
The placing of a body or a part thereof into a liquid.
Immersion Foot
A condition of the feet produced by prolonged exposure of the feet to water. Exposure for 48 hours or more to warm water causes tropical immersion foot or warm-water immersion foot common in Vietnam where troops were exposed to prolonged or repeated wading in paddy fields or streams. Trench foot results from prolonged exposure to cold, without actual freezing. It was common in trench warfare during World War I, when soldiers stood, sometimes for hours, in trenches with a few inches of cold water in them. (Andrews' Diseases of the Skin, 8th ed, p27)
Lightning
An abrupt high-current electric discharge that occurs in the ATMOSPHERE and that has a path length ranging from hundreds of feet to tens of miles. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
Lightning Injuries
Accidental injuries caused by brief high-voltage electrical discharges during thunderstorms. Cardiopulmonary arrest, coma and other neurologic symptoms, myocardial necrosis, and dermal burns are common. Prompt treatment of the acute sequelae, including cardiopulmonary resuscitation, is indicated for survival.
Motion Sickness
Disorder caused by motion. It includes sea sickness, train sickness, roller coaster rides, rocking chair, hammock swing, car sickness, air sickness, or SPACE MOTION SICKNESS. Symptoms include nausea, vomiting and/or dizziness.
Space Motion Sickness
Disorder characterized by nausea, vomiting, and dizziness, possibly in response to vestibular disorientation or fluid shifts associated with space flight. (From Webster's New World Dictionary)
Spasms, Infantile
An epileptic syndrome characterized by the triad of infantile spasms, hypsarrhythmia, and arrest of psychomotor development at seizure onset. The majority present between 3-12 months of age, with spasms consisting of combinations of brief flexor or extensor movements of the head, trunk, and limbs. The condition is divided into two forms: cryptogenic (idiopathic) and symptomatic (secondary to a known disease process such as intrauterine infections; nervous system abnormalities; BRAIN DISEASES, METABOLIC, INBORN; prematurity; perinatal asphyxia; TUBEROUS SCLEROSIS; etc.). (From Menkes, Textbook of Child Neurology, 5th ed, pp744-8)
About the T75 Code Range
The T75 ICD-10 code section covers various less common and unspecified effects caused by external forces such as lightning, drowning, vibration, motion sickness, electrocution, and abnormal gravitational forces. These codes are used when conditions result from these specific external events but do not fit more specific injury categories.
This section includes codes like T75.00 for unspecified effects of lightning, addressing injuries such as electric shock or direct lightning strike, also known as accidents caused by lightning or electric shock injury of peripheral nerve. Codes under drowning, such as T75.1XXA, capture effects like immersion hypothermia or acute respiratory distress syndrome following nonfatal submersion. For vibration-related injuries, codes like T75.20XA include vibration injury of peripheral nerve, pneumatic hammer syndrome, and traumatic vasospastic syndrome (a vasomotor arterial disorder). Motion sickness, encompassing car, sea, or air sickness, is coded under T75.3XXA. Electrocution injuries, including paralysis and cardiac arrest caused by electric shock, are found under T75.4XXA. Additionally, effects of abnormal gravitation or weightlessness, often relevant in aerospace medicine, fall under T75.81XA and T75.82XA. This ICD-10 code series helps clinicians and coders accurately document diagnoses from these diverse external causes when more specific codes are not available.
Questions About This Page
How many billable codes are in the T75 range?
Of the 69 codes in this range, 48 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the T75 range classify?
The range classifies other and unspecified effects of other external causes. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
