2026 ICD-10-CM Diagnosis Code R45.84Anhedonia

ICD-10-CM Codes›R00–R99›R40-R46›R45

ICD-10-CM R45.84
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

R45.84 is a billable ICD-10-CM diagnosis code for anhedonia. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 947 through 948. 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 Symptoms of mental and substance use conditions.

Code Identity

ICD-10-CM Code
R45.84
Billable Status
Yes — Valid for Submission
Code Describes
Anhedonia
Short Description
Anhedonia
Same as the full description in the CMS dataset.
Parent Code
R45.8
Other 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 CodeR45.84Anhedonia

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Anhedonia
  • Capacity for emotion - finding
  • Capacity for enjoyment - finding
  • Enjoyment of life - finding
  • Loss of capacity for enjoyment
  • Markedly diminished pleasure

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.

    • Anhedonia

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

Clinical InformationClinical

  • Anhedonia

    inability to experience pleasure due to impairment or dysfunction of normal psychological and neurobiological mechanisms. it is a symptom of many psychotic disorders (e.g., depressive disorder, major; and schizophrenia).

  • Anhedonia

    an inability to experience pleasure.

Patient EducationClinical

Depression

Depression is more than a feeling of being sad or irritable for a few days. It's a serious mood disorder. As one of the most common mental disorders in the United States, depression can affect how you think, feel, and your everyday life.

The full article covers:

  • What is depression?
  • What are the different types of depression?
  • What causes depression?
  • Who is at risk of depression?
  • What are the symptoms of depression?
  • How is depression diagnosed?
  • What are the treatments for depression?
  • Can depression be prevented?

Read the full article at MedlinePlus

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

Convert R45.84 to ICD-9-CMHistory

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

ICD-9-CM
780.99 Other general symptoms
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 R45.84Overview

Is R45.84 (Other symptoms and signs involving emotional state) a billable code?

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

What MS-DRG does R45.84 group to?

When anhedonia is the principal diagnosis on an inpatient stay, it groups to MS-DRG 947, 948, with relative weights from 0.8005 to 1.2694 depending on complications. Higher weights mean higher Medicare reimbursement.

Can R45.84 be a principal diagnosis?

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

What is the ICD-9 equivalent of R45.84?

Under the General Equivalence Mappings, anhedonia converts to ICD-9-CM 780.99 (other general symptoms). 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.