ICD-10-CM 2027 diagnosis code
R55Syncope and collapse
R55 is a valid, billable ICD-10-CM code for syncope and collapse. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
Looking up by condition? See ICD-10 code for Syncope, ICD-10 code for Blackout, ICD-10 code for Collapse, ICD-10 code for Pre-syncope.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About R55
R55 is the ICD-10-CM diagnosis code for syncope and collapse. It belongs to block R50-R69 (general symptoms and signs) and chapter 18 (symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
Don't report R55 together with the conditions in its Excludes1 note: cardiogenic shock (R57.0), carotid sinus syncope (G90.01), heat syncope (T67.1), neurocirculatory asthenia (F45.8) and 9 more.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 312 (Syncope and Collapse, relative weight 0.866), in MDC 05 (Diseases and Disorders of the Circulatory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 780.2 (syncope and collapse).
Coding notes
- Blackout
- Fainting
- Vasovagal attack
- 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-)
Notes that apply from higher levels
Instructions written at a parent level also apply to R55.
Broader instructions also apply from Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified.
Alphabetic index entries
30 entriesTerms in the official ICD-10-CM index that lead to R55.
- 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)
Codes whose notes reference R55
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 05 · Diseases and Disorders of the Circulatory System
ICD-9-CM equivalent
Converter →- 780.2Syncope and collapseexact
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about R55
Is R55 billable?
- Yes. R55 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can R55 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict R55 as a principal diagnosis.
Is R55 a CC or MCC?
- No. R55 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does R55 group to?
- R55 is used in the MS-DRG v44.0 logic for MS-DRG 312 (Syncope and Collapse). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for R55?
- The CMS General Equivalence Mappings map R55 to ICD-9-CM 780.2.