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ICD-10 Coding for Obtundation(R40.0, G92)

Complete ICD-10-CM coding and documentation guide for Obtundation. Includes clinical validation requirements, documentation requirements, and coding pitfalls.

Also known as:

Reduced alertnessDecreased responsiveness

Related ICD-10 Code Ranges

Complete code families applicable to Obtundation

R40.0Primary Range

Somnolence, stupor, and obtundation

Primary code for states of reduced alertness and responsiveness when no underlying cause is identified.

Toxic encephalopathy

Used when obtundation is due to drug toxicity.

Metabolic encephalopathy

Used when obtundation is due to metabolic disturbances.

Code Comparison: When to Use Each Code

Compare key differences between these codes to ensure accurate selection

CodeDescriptionWhen to UseKey Documentation
R40.0Somnolence, stupor, and obtundationUse when no definitive cause of reduced alertness is identified.
  • GCS ≤12
  • Normal head CT
  • Absence of CAM criteria
G92Toxic encephalopathyUse when obtundation is due to drug toxicity.
  • Serum drug levels > therapeutic range
  • Documented Naloxone response

Clinical Decision Support

Always review the patient's clinical documentation thoroughly. When in doubt, choose the more specific code and ensure documentation supports it.

Key Information: ICD-10 code for obtundation

Essential facts and insights about Obtundation

The ICD-10 code for obtundation is R40.0, used when no specific underlying cause is identified.

Primary ICD-10-CM Codes for obtundation

Somnolence, stupor, and obtundation
Billable Code

Decision Criteria

clinical Criteria

  • No definitive cause identified after workup.

coding Criteria

  • Avoid if specific cause like sepsis or drug toxicity is documented.

Applicable To

  • Obtundation
  • Somnolence
  • Stupor

Excludes

Clinical Validation Requirements

  • GCS ≤12
  • Normal head CT
  • Absence of CAM criteria

Code-Specific Risks

  • Incorrect use when a specific cause is known.

Coding Notes

  • Ensure no underlying cause is documented before using R40.0.

Ancillary Codes

Additional codes that should be used in conjunction with the main diagnosis codes when applicable.

Toxic encephalopathy

G92
Use when obtundation is due to drug toxicity.

Metabolic encephalopathy

G93.41
Use when obtundation is due to metabolic disturbances.

Differential Codes

Alternative codes to consider when ruling out similar conditions to the primary diagnosis.

Stupor

R40.1
Stupor involves more profound unresponsiveness compared to obtundation.

Coma

R40.2-
Coma is characterized by complete unresponsiveness.

Metabolic encephalopathy

G93.41
Use G93.41 for metabolic causes, not toxins.

Documentation & Coding Risks

Avoid these common documentation and coding issues when documenting Obtundation to ensure proper reimbursement, maintain compliance, and reduce audit risk. These guidelines are particularly important when using ICD-10 code R40.0.

Impact

Clinical: Misinterpretation of patient's condition., Regulatory: Potential for audit issues., Financial: Incorrect reimbursement due to coding errors.

Mitigation Strategy

Use specific terms and scales like GCS., Document underlying causes if known.

Impact

Reimbursement: May lead to incorrect DRG assignment., Compliance: Non-compliance with coding guidelines., Data Quality: Inaccurate clinical data representation.

Mitigation Strategy

Identify and code the underlying cause first.

Impact

Failure to sequence underlying cause codes before R40.0.

Mitigation Strategy

Educate coders on proper sequencing rules.

Documentation errors, coding pitfalls, and audit risks are interconnected aspects of medical coding and billing. Addressing all three areas helps ensure accurate coding, optimal reimbursement, and regulatory compliance.

Frequently Asked Questions

Common questions about ICD-10 coding for Obtundation, with expert answers to help guide accurate code selection and documentation.

Documentation Templates for Obtundation

Use these documentation templates to ensure complete and accurate documentation for Obtundation. These templates include all required elements for proper coding and billing.

Emergency Department Evaluation

Specialty: Emergency Medicine

Required Elements

  • Level of consciousness
  • Response to stimuli
  • Glasgow Coma Scale
  • Supporting lab results

Example Documentation

Patient exhibits obtunded mental status: responds only to vigorous tactile stimulation with unintelligible vocalizations. GCS 10. No evidence of infectious source or toxic ingestion. Serum sodium 118 mEq/L.

Examples: Poor vs. Good Documentation

Poor Documentation Example
Patient sleepy, difficult to arouse.
Good Documentation Example
Obtunded mental status: requires repeated sternal rub to elicit eye opening (GCS 8). Normal CT head. Serum glucose 82 mg/dL, ammonia 25 μmol/L.
Explanation
The good example provides specific clinical findings and supporting lab results, improving clarity and coding accuracy.

Need help with ICD-10 coding for Obtundation? Ask your questions below.

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