Alyce Reavis, RN,MSN,CCDS,CCS • July 7, 2026

When to Query for Hepatic Encephalopathy: CDI Documentation Tips 

In This Tip, You'll Learn How To: 

  • Recognize when a CDI query for hepatic encephalopathy is appropriate. 
  • Identify the documentation needed to support accurate hepatic encephalopathy ICD-10-CM coding. 
  • Link hepatic encephalopathy to the underlying liver disease for compliant code assignment. 
  • Spot common clinical indicators that support physician clarification. 
  • Avoid documentation gaps that can affect DRG assignment, severity reporting, and audit readiness. 

Accurate hepatic encephalopathy ICD-10 coding depends on precise physician documentation that captures the condition's clinical complexity and its relationship to underlying liver disease. Without a clear, documented linkage, CDI specialists risk missed diagnoses, inaccurate severity of illness scores, and lost reimbursement. Understanding when and how to query can meaningfully improve both record accuracy and patient safety outcomes. 


What Is Hepatic Encephalopathy? 

Hepatic encephalopathy (HE) is a neuropsychiatric complication of acute or chronic liver failure characterized by a spectrum of cognitive and motor disturbances — ranging from subtle personality changes to profound coma. It results from the accumulation of neurotoxins, particularly ammonia, when the liver can no longer adequately detoxify portal blood. HE is a serious, life-threatening condition that significantly affects a patient's severity of illness and risk of mortality. 


The code for hepatic encephalopathy is K76.82, Hepatic encephalopathy. There is a code also note that says to report the codes for the underlying liver disease. 


The codes in the table below are for the underlying liver disease. 


When reporting the underlying liver disease, keep in mind that there is an Excludes1 note for K72.01, K70.41, K72.11, K72.91. 


ICD-10-CM Codes 

Code Description
K72.91 Hepatic failure, unspecified with coma
K72.11 Chronic hepatic failure with coma
K72.01 Acute and subacute hepatic failure with coma
K70.41 Alcoholic hepatic failure with coma
K70.41 Toxic liver disease with hepatic necrosis, with coma
G93.40 Encephalopathy, unspecified

 CDI Note: ICD-10-CM classifies hepatic encephalopathy as a manifestation of hepatic failure "with coma." The coma code component is applied even for milder HE stages when documented by the physician, making precise documentation critical.


Clinical Indicators 

  • Altered mental status or confusion in a patient with known cirrhosis or liver disease 
  • Elevated serum ammonia levels (though not required for diagnosis, often present) 
  • Asterixis (flapping tremor) noted on physical exam 
  • EEG findings consistent with encephalopathy (e.g., triphasic waves) 
  • Use of lactulose or rifaximin as treatment indicators in the medication record 
  • Precipitating factors documented, such as GI bleeding, infection, or medication noncompliance 


Documentation Requirements 

  • Physician must explicitly state "hepatic encephalopathy" — terms like "confusion in setting of liver disease" are not codeable without a confirmed diagnosis 
  • The underlying liver disease (e.g., alcoholic cirrhosis, chronic hepatitis C) must be linked to the HE in documentation 
  • Severity or stage of HE should be noted when possible (e.g., West Haven Grade I–IV) 
  • Documentation should capture the precipitating factor (e.g., infection, GI bleed, dietary noncompliance) to tell the complete clinical story 
  • Progress notes, discharge summaries, and H&P must consistently reflect the diagnosis across the record 


CDI Query Opportunity 

Consider querying when a patient with known cirrhosis presents with altered mental status, confusion, or cognitive changes — and the physician has documented treatment with lactulose or rifaximin but has not explicitly named hepatic encephalopathy as a diagnosis. In this scenario, a concurrent query asking the physician to clarify whether the patient's altered mental status represents hepatic encephalopathy is both clinically supported and coding-essential. Capturing the confirmed diagnosis drives appropriate DRG assignment, reflects true severity of illness, and supports quality metrics. The query should reference specific clinical indicators from the record, such as elevated ammonia, asterixis, or EEG findings. 


FAQs

  • Does elevated ammonia alone justify coding hepatic encephalopathy?

    No. Elevated ammonia supports the clinical picture but is not sufficient for code assignment without a physician's documented diagnosis. CDI specialists should use ammonia levels as a query trigger, not as a standalone coding rationale. 

  • Can hepatic encephalopathy be coded as a secondary diagnosis?

    The hepatic encephalopathy is not a CC or MCC. The underlying liver disease code can add that so documentation would need to be specific enough to get two codes. 

  • What is the difference between coding G93.40 versus K72.91?

    G93.40 (Encephalopathy, unspecified) should only be used when the encephalopathy cannot be attributed to hepatic failure. When hepatic failure is the cause, then we would report K76.82 followed by a code like K70.40, alcoholic hepatic failure without coma. 

Key Takeaways 

  • Hepatic encephalopathy ICD-10 coding requires an explicit physician diagnosis — implied documentation is not enough 
  • Link HE to the underlying liver disease in all documentation to support accurate code assignment 
  • Clinical triggers (lactulose use, asterixis, elevated ammonia) are strong query opportunities, not standalone code justifications 
  • Consistent documentation across the H&P, progress notes, and discharge summary is essential for audit defense 
  • Accurate HE coding directly impacts DRG assignment, severity of illness, and risk-adjusted quality outcomes 
Alyce Reavis, RN,MSN,CCDS,CCS

Alyce Reavis, RN,MSN,CCDS,CCS 

Senior CDI Educator, Consulting Services at UASI


Drawing on clinical experience in adult, pediatric, and neonatal acute care, Alyce brings valuable insight to CDI education and documentation improvement. She holds an MSN in Leadership/Education along with CCDS, CCS, and AHIMA’s outpatient CDI micro credential, supporting health systems in strengthening documentation accuracy, quality reporting, and reimbursement integrity. Passionate about truthful, clinically aligned health records, she helps organizations ensure documentation reflects true patient acuity. She is a past presenter for the ACDIS National Convention, Local chapter meetings, and the ACDIS Virtual Best Practices conference. 


Works Cited

American Health Information Management Association. (2023). *ICD-10-CM Official Guidelines for Coding and Reporting FY2024.* Available at: https://www.cms.gov/files/document/fy-2026-icd-10-cm-coding-guidelines.pdf


American Association for the Study of Liver Diseases. (2014). *Hepatic Encephalopathy in Chronic Liver Disease: 2014 Practice Guideline.* Available at: https://www.aasld.org/publications/practice-guidelines 

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