2026 ICD-10-CM Diagnosis Code R55Syncope and collapse

ICD-10-CM Codes›R00–R99›R50-R69›R55

ICD-10-CM R55
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

R55 is a billable ICD-10-CM diagnosis code for syncope and collapse. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). As a symptom code, it should not be used as a principal diagnosis once a related definitive diagnosis has been established. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Syncope.

This medical diagnosis code is frequently used in Cardiology medical specialties to designate conditions such syncope and collapse.

Code Identity

ICD-10-CM Code
R55
Billable Status
Yes — Valid for Submission
Code Describes
Syncope and collapse
Chapter
R50-R69
General symptoms and signs

Code Classification

ChapterR00–R99Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
SectionR50-R69General symptoms and signs
CategoryR55Syncope and collapse
This CodeR55Syncope and collapse

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Anoxic seizure
  • Brief loss of consciousness
  • Cardiac syncope
  • Collapse
  • Collapse due to asphyxia
  • Convulsive syncope
  • Defecation syncope
  • Deglutition syncope
  • Dissociative neurological symptom disorder co-occurrent with alteration of consciousness
  • Drop attack
  • Effort syncope
  • Elderly vasovagal syndrome
  • Hypotensive syncope
  • Incomplete loss of consciousness without amnesia
  • Loss of consciousness
  • Loss of consciousness due to epidural intracranial hemorrhage
  • Malignant vasovagal syndrome
  • Micturition syncope
  • Moderate loss of consciousness
  • Near syncope
  • Prolonged loss of consciousness
  • Robin sequence
  • Situational syncope
  • Syncope
  • Syncope and collapse
  • Syncope caused by centrifugal force in flying
  • Syncope due to autonomic failure
  • Syncope due to orthostatic hypotension
  • Syncope symptom
  • Tussive syncope
  • Vasovagal symptom
  • Vasovagal syncope
  • Vasovagal syncope due to immersion
  • Ventricular extrasystoles with syncope, perodactyly and Robin sequence syndrome
  • Witnessed syncope

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Blackout
  • Fainting
  • Vasovagal attack

Type 1 Excludes

  • cardiogenic shock R57.0
  • carotid sinus syncope G90.01
  • heat syncope T67.1
  • neurocirculatory asthenia F45.8
  • neurogenic orthostatic hypotension G90.3
  • orthostatic hypotension I95.1
  • postprocedural shock T81.1
  • psychogenic syncope F48.8
  • shock NOS R57.9
  • shock complicating or following abortion or ectopic or molar pregnancy O00 O07 O08.3
  • shock complicating or following labor and delivery O75.1
  • Stokes-Adams attack I45.9
  • unconsciousness NOS R40.2

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Arrhythmia(auricle)(cardiac)(juvenile)(nodal)(reflex)(supraventricular)(transitory)(ventricle)
      • vagal
    • Attack, attacks
      • drop NEC
    • Attack, attacks
      • syncope
    • Attack, attacks
      • unconsciousness
    • Attack, attacks
      • vasomotor
    • Attack, attacks
      • vasovagal (paroxysmal) (idiopathic)
    • Blackout
    • Collapse
    • Collapse
      • general
    • Drop(in)
      • attack NEC
    • Fainting(fit)
    • Fit
      • fainting
    • Gower's
      • syndrome (vasovagal attack)
    • Instability
      • vasomotor
    • Loss(of)
      • consciousness, transient
    • Near-syncope
    • Phenomenon
      • vasomotor
    • Phenomenon
      • vasovagal
    • Pre-syncope
    • Reflex
      • vasovagal
    • Syncope(near) (pre-)
    • Syncope(near) (pre-)
      • cardiac
    • Syncope(near) (pre-)
      • heart
    • Syncope(near) (pre-)
      • vasoconstriction
    • Syncope(near) (pre-)
      • vasodepressor
    • Syncope(near) (pre-)
      • vasomotor
    • Syncope(near) (pre-)
      • vasovagal
    • Syndrome
      • Gower's
    • Syndrome
      • vasovagal
    • Vasovagal attack(paroxysmal)

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR SYM001
Syncope
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Heat Stress Disorders

    a group of conditions that develop due to overexposure or overexertion in excessive environmental heat.

  • Syncope

    a transient loss of consciousness and postural tone caused by diminished blood flow to the brain (i.e., brain ischemia). presyncope refers to the sensation of lightheadedness and loss of strength that precedes a syncopal event or accompanies an incomplete syncope. (from adams et al., principles of neurology, 6th ed, pp367-9)

  • Syncope, Vasovagal

    loss of consciousness due to a reduction in blood pressure that is associated with an increase in vagal tone and peripheral vasodilation.

  • Brain Ischemia

    localized reduction of blood flow to brain tissue due to arterial obstruction or systemic hypoperfusion. this frequently occurs in conjunction with brain hypoxia (hypoxia, brain). prolonged ischemia is associated with brain infarction.

  • Collapse

    failure of a physiologic function or system.

  • Collapse of Device|Collapse

    problem associated with the buckling or crushing of material from external forces.

  • Collapsed Lumen|COLLAPSED LUMEN

    a finding in which the walls of a tube or tubular organ have contorted or buckled into its cavity or channel.

  • Collapsed Lung

    atelectasis of an entire lung.

  • Device Collapser

    a component designed to fold or collapse something.

  • Difficult to Fold or Unfold|Difficult to Fold, Unfold or Collapse

    problem associated with the use of the device in terms of the user experiencing difficulty to close or to spread out/extend length of the device, even if the operation is being performed according to labeled instructions for use.

  • Inferior Vena Cava Collapse Due to Sniff Test Indicator|IVCCSIND|Inferior Vena Cava Collapse Indicator|Inferior Vena Cava Collapse Sniff Ind|Inferior Vena Cava Collapse Sniff Ind

    an indication as to whether resting inferior vena cava diameter is reduced with sniff, which is defined as a sharp inhalation.

  • Shock|Circulatory Collapse

    a life-threatening condition that requires immediate medical intervention. it is characterized by reduced blood flow that may result in damage of multiple organs. types of shock include cardiogenic, hemorrhagic, septic, anaphylactic, and traumatic shock.

Patient EducationClinical

Fainting

Fainting is a temporary loss of consciousness. If you're about to faint, you'll feel dizzy, lightheaded, or nauseous. Your field of vision may "white out" or "black out." Your skin may be cold and clammy. You lose muscle control at the same time, and may fall down.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert R55 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
780.2 Syncope and collapse
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About R55Overview

Is R55 (Syncope and collapse) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report syncope and collapse on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Can R55 be a principal diagnosis?

Use it with care. This is a symptom code, so once a definitive diagnosis explaining the syncope and collapse is established, that condition takes the principal position instead.

What is the ICD-9 equivalent of R55?

Under the General Equivalence Mappings, syncope and collapse converts to ICD-9-CM 780.2 (syncope and collapse). The mapping is a direct match.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.