2026 ICD-10-CM Diagnosis Code F43.10Post-traumatic stress disorder, unspecified

ICD-10-CM Codes›F01–F99›F40-F48›F43

ICD-10-CM F43.10
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

F43.10 is a billable ICD-10-CM diagnosis code for post-traumatic stress disorder, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as complex post-traumatic stress disorder. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Trauma- and stressor-related disorders.

Code Identity

ICD-10-CM Code
F43.10
Billable Status
Yes — Valid for Submission
Code Describes
Post-traumatic stress disorder, unspecified
Short Description
Post-traumatic stress disorder, unspecified
Same as the full description in the CMS dataset.
Parent Code
F43.1
Post-traumatic stress disorder (PTSD)

Code Classification

ChapterF01–F99Mental and behavioural disorders
SectionF40-F48Anxiety, dissociative, stress-related, somatoform and other nonpsychotic mental disorders
CategoryF43Reaction to severe stress, and adjustment disorders
This CodeF43.10Post-traumatic stress disorder, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Complex post-traumatic stress disorder
  • Concentration camp syndrome
  • Delayed onset post-traumatic stress disorder
  • Delayed onset post-traumatic stress disorder following military combat
  • Improvement in post-trauma response
  • Post-trauma response
  • Post-traumatic stress disorder
  • Stockholm syndrome

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.

    • Disorder(of)
      • post-traumatic stress (PTSD)
    • Disorder(of)
      • stress
        • post-traumatic
    • Neurosis, neurotic
      • posttraumatic (situational)
    • Neurosis, neurotic
      • traumatic

Clinical ClassificationClinical

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

CCSR MBD007
Trauma- and stressor-related disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Post-Traumatic Stress Disorder

Post-traumatic stress disorder (PTSD) is a mental health disorder that some people develop after they experience or see a traumatic event. The traumatic event may be life-threatening, such as combat, a natural disaster, a car accident, or sexual assault. But sometimes the event is not necessarily a dangerous one.

The full article covers:

  • What is post-traumatic stress disorder (PTSD)?
  • What causes post-traumatic stress disorder (PTSD)?
  • Who is more likely to develop post-traumatic stress disorder (PTSD)?
  • What are the symptoms of post-traumatic stress disorder (PTSD)?
  • How is post-traumatic stress disorder (PTSD) diagnosed?
  • What are the treatments for post-traumatic stress disorder (PTSD)?
  • Can post-traumatic stress disorder (PTSD) be prevented?

Read the full article at MedlinePlus

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

Convert F43.10 to ICD-9-CMHistory

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

ICD-9-CM
309.81 Posttraumatic stress dis
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 F43.10Overview

Is F43.10 (Post-traumatic stress disorder (PTSD)) a billable code?

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

What is the ICD-9 equivalent of F43.10?

Under the General Equivalence Mappings, post-traumatic stress disorder, unspecified converts to ICD-9-CM 309.81 (posttraumatic stress dis). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.