2026 ICD-10-CM Diagnosis Code R45.851Suicidal ideations

ICD-10-CM Codes›R00–R99›R40-R46›R45

ICD-10-CM R45.851
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

R45.851 is a billable ICD-10-CM diagnosis code for suicidal ideations. 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 Suicidal ideation/attempt/intentional self-harm.

Code Identity

ICD-10-CM Code
R45.851
Billable Status
Yes — Valid for Submission
Code Describes
Suicidal ideations
Short Description
Suicidal ideations
Same as the full description in the CMS dataset.
Parent Code
R45.85
Homicidal and suicidal ideations

Code Classification

ChapterR00–R99Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
SectionR40-R46Symptoms and signs involving cognition, perception, emotional state and behavior
CategoryR45Symptoms and signs involving emotional state
This CodeR45.851Suicidal ideations

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • At increased risk for suicide
  • Feeling suicidal
  • Harmful thoughts
  • Has access to planned means of suicide
  • High suicide risk
  • Moderate suicide risk
  • Planning suicide
  • Suicidal
  • Suicidal behavior
  • Suicidal intent
  • Suicidal thoughts
  • Thoughts of self harm
  • Threatening suicide

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.

    • Ideation
      • suicidal

Clinical ClassificationClinical

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

CCSR MBD012
Suicidal ideation/attempt/intentional self-harm
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Suicide

Suicide is the taking of one's own life. It is a death that happens when someone harms themselves because they want to end their life. A suicide attempt is when someone harms themselves to try to end their life, but they do not die.

The full article covers:

  • What is suicide?
  • Who is at risk for suicide?
  • What are the warning signs for suicide?
  • What should I do if I need help or know someone who does?

Read the full article at MedlinePlus

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

Convert R45.851 to ICD-9-CMHistory

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

ICD-9-CM
V62.84 Suicidal ideation
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 R45.851Overview

Is R45.851 (Homicidal and suicidal ideations) a billable code?

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

Can R45.851 be a principal diagnosis?

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

What is the ICD-9 equivalent of R45.851?

Under the General Equivalence Mappings, suicidal ideations converts to ICD-9-CM V62.84 (suicidal ideation). 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.