2026 ICD-10-CM Diagnosis Code F07.81Postconcussional syndrome

ICD-10-CM Codes›F01–F99›F01-F09›F07

ICD-10-CM F07.81
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

F07.81 is a billable ICD-10-CM diagnosis code for postconcussional syndrome. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 102 through 103. The code is not accepted as a principal diagnosis by the Medicare Code Editor. Coders also document this condition as chronic traumatic encephalopathy. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Neurocognitive disorders.

Code Identity

ICD-10-CM Code
F07.81
Billable Status
Yes — Valid for Submission
Code Describes
Postconcussional syndrome
Short Description
Postconcussional syndrome
Same as the full description in the CMS dataset.
Parent Code
F07.8
Other personality and behavioral disorders due to known physiological condition

Code Classification

ChapterF01–F99Mental and behavioural disorders
SectionF01-F09Mental disorders due to known physiological conditions
CategoryF07Personality and behavioral disorders due to known physiological condition
This CodeF07.81Postconcussional syndrome

Code EditsBilling

Medicare Code Editor checks that affect claim validity for F07.81.

Unacceptable principal diagnosis
There are selected codes that describe a circumstance which influences an individual's health status but not a current illness or injury, or codes that are not specific manifestations but may be due to an underlying cause. These codes are considered unacceptable as a principal diagnosis.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Chronic traumatic encephalopathy
  • Late effect of traumatic injury to brain
  • Postconcussion state
  • Postconcussion syndrome
  • Post-concussional personality disorder
  • Traumatic encephalopathy

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Postcontusional syndrome (encephalopathy)
  • Post-traumatic brain syndrome, nonpsychotic

Use Additional Code

  • code to identify associated post-traumatic headache, if applicable G44.3

Type 1 Excludes

  • current concussion brain S06.0
  • postencephalitic syndrome F07.89

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.

    • Concussion(brain) (cerebral) (current)
      • syndrome
    • Disorder(of)
      • mental (or behavioral) (nonpsychotic)
        • following organic brain damage
          • postconcussional syndrome
    • Disorder(of)
      • postconcussional
    • Encephalopathy(acute)
      • in (due to) (with)
        • trauma (postconcussional)
    • Encephalopathy(acute)
      • postcontusional
    • Encephalopathy(acute)
      • traumatic (postconcussional)
    • Encephalosis, posttraumatic
    • Postconcussional syndrome
    • Postcontusional syndrome
    • Post-traumatic brain syndrome, nonpsychotic
    • Psychopathy, psychopathic
      • constitution, post-traumatic
    • Punch drunk
    • Status(post)
      • postcommotio cerebri
    • Syndrome
      • brain (nonpsychotic)
        • organic
          • post-traumatic (nonpsychotic)
    • Syndrome
      • brain (nonpsychotic)
        • postcontusional
    • Syndrome
      • brain (nonpsychotic)
        • post-traumatic, nonpsychotic
    • Syndrome
      • concussion
    • Syndrome
      • postconcussional
    • Syndrome
      • postcontusional

Clinical ClassificationClinical

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

CCSR NVS011
Neurocognitive disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Chronic Traumatic Encephalopathy

    degenerative brain disease linked to repetitive brain trauma. progressive symptoms may include memory loss; aggression; or depression.

  • Traumatic Encephalopathy

    encephalopathy resulting from trauma.

Patient EducationClinical

Concussion

A concussion is a type of brain injury. It involves a short loss of normal brain function. It happens when a hit to the head or body causes your head and brain to move rapidly back and forth. This sudden movement can cause the brain to bounce around or twist in the skull, creating chemical changes in your brain.

Read the full article at MedlinePlus

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

Convert F07.81 to ICD-9-CMHistory

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

ICD-9-CM
310.2 Postconcussion syndrome
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 F07.81Overview

Is F07.81 a billable code?

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

What MS-DRG does F07.81 group to?

On inpatient claims, postconcussional syndrome maps to MS-DRG 102, 103, with relative weights from 0.8363 to 1.1209 depending on complications. Higher weights mean higher Medicare reimbursement.

Can F07.81 be a principal diagnosis?

No. The Medicare Code Editor rejects this code as a principal diagnosis because postconcussional syndrome describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.

What is the ICD-9 equivalent of F07.81?

Under the General Equivalence Mappings, postconcussional syndrome converts to ICD-9-CM 310.2 (postconcussion syndrome). 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.