2026 ICD-10-CM Diagnosis Code R45.2Unhappiness

ICD-10-CM Codes›R00–R99›R40-R46›R45

ICD-10-CM R45.2
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

R45.2 is a billable ICD-10-CM diagnosis code for unhappiness. 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. Coders also document this condition as feeling despair. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Symptoms of mental and substance use conditions.

Code Identity

ICD-10-CM Code
R45.2
Billable Status
Yes — Valid for Submission
Code Describes
Unhappiness
Short Description
Unhappiness
Same as the full description in the CMS dataset.
Parent Code
R45
Symptoms and signs involving emotional state

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 CodeR45.2Unhappiness

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Feeling despair
  • Feeling unhappy
  • Improved mood
  • Persistent sadness
  • Reduced level of persistent sadness

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.

    • Unhappiness

Clinical ClassificationClinical

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

CCSR SYM008
Symptoms of mental and substance use conditions
Default principal diagnosis: inpatient Yes · outpatient Yes

Convert R45.2 to ICD-9-CMHistory

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

ICD-9-CM
300.9 Nonpsychotic disord NOS
Approximate The match is approximate rather than exact.

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 R45.2Overview

Is R45.2 (Symptoms and signs involving emotional state) a billable code?

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

Can R45.2 be a principal diagnosis?

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

What is the ICD-9 equivalent of R45.2?

Under the General Equivalence Mappings, unhappiness converts to ICD-9-CM 300.9 (nonpsychotic disord NOS). The mapping is approximate, so confirm the match fits the documentation.

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.