Concussion ICD-10-CM Coding: Current Injury vs. Post-Concussional Syndrome

Concussions are among the most commonly coded traumatic brain injuries (TBIs) in outpatient, emergency department, sports medicine, neurology, and urgent care settings. However, ICD-10-CM concussion coding requires careful attention to the duration of loss of consciousness (LOC), encounter status, and whether the provider is treating an acute injury or persistent post-concussive symptoms.

This updated 2026 medical coding guide explains the ICD-10-CM rules for coding current concussions, post-concussion syndrome, sequela conditions, history of concussion, documentation requirements, and CPC exam tips.

Quick Answer: What Is the ICD-10 Code for a Concussion?

For a current concussion, use category S06.0X-. Accurate coding requires a 6th character to identify the duration of loss of consciousness (LOC) and a 7th character for the encounter type.

Examples include:

• S06.0X0A – Concussion without loss of consciousness, initial encounter
• S06.0X1A – Concussion with LOC of 30 minutes or less, initial encounter
• S06.0X2A – Concussion with LOC of 31–59 minutes, initial encounter

For lingering symptoms after the initial injury has healed, assign F07.81 for post-concussional syndrome.

2026 Concussion Coding Table (S06.0X)

The following table provides quick-reference ICD-10-CM codes for the most commonly reported concussion diagnoses.

Additional concussion code options may apply depending on the exact documented LOC duration and encounter type.

Common search terms associated with these diagnoses include:

• diagnosis code for concussion
• concussion with loss of consciousness ICD-10
• ICD-10 mild concussion
• concussion ICD code
• DX code for concussion

Understanding Category S06.0X-

Category S06.0X- is used for acute concussion injuries. These codes are classified under traumatic brain injuries (TBI) within ICD-10-CM Chapter 19.

Documentation should clearly identify:

• Whether loss of consciousness occurred
• The duration of LOC
• The encounter type
• Current symptoms
• Neurological findings
• Whether the concussion is still actively being treated

Providers often document symptoms such as:

• Headache
• Dizziness
• Memory impairment
• Nausea
• Sensitivity to light
• Difficulty concentrating
• Balance disturbances

Medical coders should verify that the provider documentation supports the specific LOC duration before selecting the appropriate code.

Post-Concussion Syndrome (F07.81)

Post-concussion syndrome occurs when symptoms continue beyond the expected recovery period after the initial injury.

The ICD-10-CM code for post-concussion syndrome is:

• F07.81 – Postconcussional syndrome

Common persistent symptoms include:

• Chronic headaches
• Dizziness
• Cognitive fatigue
• Memory problems
• Sleep disturbances
• Mood changes
• Difficulty concentrating

This diagnosis is typically assigned after the acute injury phase has resolved.

Common keyword searches include:

• post concussion syndrome ICD-10
• ICD-10 post concussive syndrome
• postconcussion syndrome ICD-10

Coding Alert

Do not use S06.0X- codes if the patient is only being treated for post-concussion syndrome (F07.81). Category S-codes are for the acute injury phase.

7th Character Requirements: A, D, or S?

Concussion ICD-10-CM codes require a 7th character extension to identify the encounter status.

A — Initial Encounter

Use “A” when the patient is receiving active treatment for the concussion.

Examples:

• Emergency department care
• Initial physician evaluation
• Surgical treatment
• Active management of symptoms

Example:

• S06.0X0A

D — Subsequent Encounter

Use “D” after active treatment has ended and the patient is receiving routine healing care.

Examples:

• Follow-up visits
• Observation visits
• Rehabilitation monitoring

Example:

• S06.0X0D

S — Sequela

Use “S” for residual effects that remain after the original injury has healed.

Examples:

• Chronic headaches from prior concussion
• Memory deficits
• Cognitive impairment due to previous TBI

Example:

• S06.0X0S

When using sequelacoding, the residual condition is coded first, followed by the injury code with the “S” extension.

In many cases, F07.81 may be coded alongside a sequela concussion code if documentation supports both conditions.

Coding for History of Concussion

If the patient has fully recovered from a prior concussion but the history remains clinically relevant, assign:

• Z87.820 – Personal history of traumatic brain injury

This code may be appropriate when:

• A provider references a prior concussion history
• Previous TBI affects treatment decisions
• Sports clearance evaluations are performed
• Neurological risk factors are discussed

Do not assign active injury codes when the concussion has completely resolved.

Common keyword searches include:

• history of concussion ICD-10
• ICD-10 history of concussion
• ICD-10 code for HX of concussion

Documentation Requirements for Accurate Coding

Strong provider documentation is critical for proper reimbursement and ICD-10-CM compliance.

Documentation should include:

• Mechanism of injury
• Presence or absence of LOC
• Exact LOC duration
• Current neurological symptoms
• Cognitive findings
• Imaging results if available
• Follow-up status
• Whether symptoms are acute or chronic

Neurological exam documentation is especially important for accurate evaluation and management coding.

For additional documentation guidance, review the 2026 E/M coding guidelines at Coding Clarified E/M 2026 Guidelines

Common Concussion Coding Mistakes

Using Unspecified LOC Codes When Documentation Is Available

Coders should avoid unspecified LOC options when the physician documents a precise timeframe.

Confusing Acute Injury With Post-Concussion Syndrome

Acute concussion injuries use category S06.0X-, while persistent symptoms after recovery may require F07.81.

Missing the 7th Character

Failure to append the required 7th character can result in claim rejection.

Reporting Active Injury Codes for Resolved Conditions

Once the injury has healed, use history or sequela codes instead of active injury codes.

CPC Exam Tips for Concussion Coding

Students preparing for the CPC exam should focus on:

• Differentiating acute injury vs sequela conditions
• Identifying correct 7th character extensions
• Recognizing traumatic brain injury terminology
• Understanding LOC documentation requirements
• Following ICD-10-CM injury chapter guidelines

Remember:

• “A” does not always mean the first visit; it means active treatment.
• Sequela coding requires coding the residual condition first.
• Post-concussion syndrome is not coded as an acute concussion.

Summary

Concussion coding in ICD-10-CM requires accurate documentation of loss of consciousness, encounter type, and symptom progression.

Key codes include:

• S06.0X0A – Concussion without LOC
• S06.0X1A – Concussion with LOC less than 30 minutes
• S06.0X2A – Concussion with LOC 31–59 minutes
• F07.81 – Postconcussional syndrome
• Z87.820 – Personal history of traumatic brain injury

Understanding the difference between active injuries, sequela conditions, and historical conditions is essential for accurate medical coding, reimbursement, and CPC exam success.