2027 ICD-10-CM Diagnosis Code R45.851Suicidal ideations
ICD-10-CM Codes›R00–R99›R40-R46›R45
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
R45.851 is a billable ICD-10-CM diagnosis code for suicidal ideations. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 880. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 1 closely related codes. 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
Code Classification
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
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to R45.851: its own notes plus those printed at R45.85, block R40-R46, and Chapter 18. A note printed at a category, block or chapter applies to every code under it.
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
Notes
General instructions on how these codes are used.
- This chapter includes symptoms, signs, abnormal results of clinical or other investigative procedures, and ill-defined conditions regarding which no diagnosis classifiable elsewhere is recorded.
- Signs and symptoms that point rather definitely to a given diagnosis have been assigned to a category in other chapters of the classification. In general, categories in this chapter include the less well-defined conditions and symptoms that, without the necessary study of the case to establish a final diagnosis, point perhaps equally to two or more diseases or to two or more systems of the body. Practically all categories in the chapter could be designated 'not otherwise specified', 'unknown etiology' or 'transient'. The Alphabetical Index should be consulted to determine which symptoms and signs are to be allocated here and which to other chapters. The residual subcategories, numbered .8, are generally provided for other relevant symptoms that cannot be allocated elsewhere in the classification.
- The conditions and signs or symptoms included in categories R00-R94 consist of:
- (a) cases for which no more specific diagnosis can be made even after all the facts bearing on the case have been investigated;
- (b) signs or symptoms existing at the time of initial encounter that proved to be transient and whose causes could not be determined;
- (c) provisional diagnosis in a patient who failed to return for further investigation or care;
- (d) cases referred elsewhere for investigation or treatment before the diagnosis was made;
- (e) cases in which a more precise diagnosis was not available for any other reason;
- (f) certain symptoms, for which supplementary information is provided, that represent important problems in medical care in their own right.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name R45.851, its category, or a range that includes it.
Index to Diseases and InjuriesGuidance
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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.
Code HistoryHistory
Questions About R45.851Overview
What is the ICD-10 code for suicidal ideations?
The ICD-10-CM code for suicidal ideations is R45.851 (sometimes written as R45851). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
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, 2026 through September 30, 2027.
What MS-DRG does R45.851 group to?
When suicidal ideations is the principal diagnosis on an inpatient stay, it groups to MS-DRG 880 (acute Adjustment Reaction and Psychosocial Dysfunction), which carries a relative weight of 0.9306. Higher weights mean higher Medicare reimbursement.
Is R45.851 a CC or MCC?
CMS lists R45.851 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 1 closely related codes in its exclusion list.
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.
