DB90 - Infectious Liver Disease: Complete ICD-11 Coding Guide
1. Introduction
Infectious liver disease represents a set of conditions in which the liver is affected by various infectious agents, excluding classic viral hepatitis which has specific coding. This code encompasses bacterial, parasitic, fungal, and other infectious etiologies that cause primary or secondary hepatic impairment.
The clinical importance of infectious liver diseases lies in their capacity to cause significant hepatic dysfunction, potentially progressing to serious complications such as hepatic abscess, cholangitis, sepsis of hepatobiliary origin, and in extreme cases, hepatic insufficiency. The prevalence varies considerably according to geographic region, sanitary conditions, and local epidemiological profile, being more common in areas with limited sanitary infrastructure and greater exposure to parasitic agents.
From a public health perspective, these conditions represent a significant challenge, especially in vulnerable populations, immunocompromised patients, and in contexts of international travel. Early diagnosis and appropriate treatment are fundamental to prevent complications and reduce morbidity and mortality.
Correct coding using DB90 is critical for various aspects: it enables appropriate epidemiological tracking, facilitates prevalence and incidence studies, aids in health resource planning, ensures appropriate reimbursement in health systems, and enables analysis of clinical outcomes. Precision in coding differentiates these conditions from viral hepatitis, metabolic liver diseases, and other hepatic pathologies, ensuring targeted treatment and appropriate follow-up.
2. Correct ICD-11 Code
Code: DB90
Description: Infectious liver disease
Parent category: Diseases of the liver
The code DB90 in ICD-11 was designated specifically to classify infectious conditions affecting the hepatic parenchyma, intrahepatic biliary system or hepatic vascular structures, caused by non-viral infectious agents or by viruses different from those that cause classic viral hepatitis (A, B, C, D, E).
This code encompasses bacterial infections such as pyogenic hepatic abscess, parasitic infections including hepatic amebiasis, echinococcosis, schistosomiasis with hepatic involvement, fascioliasis, fungal infections in immunocompromised patients, and other less common infectious etiologies.
The hierarchical structure of ICD-11 positions DB90 within the chapter of diseases of the digestive system, specifically in the section of hepatic diseases, allowing systematic categorization and efficient retrieval of clinical data. Coding can be complemented with additional codes that specify the etiological agent when identified, allowing greater diagnostic granularity and facilitating more detailed epidemiological analyses.
3. When to Use This Code
Code DB90 should be applied in specific clinical situations where there is clear evidence of infectious process affecting the liver:
Scenario 1: Pyogenic Hepatic Abscess Patient presents with persistent fever, pain in the right hypochondrium, painful hepatomegaly, and imaging studies (ultrasound or computed tomography) demonstrating encapsulated fluid collection in the hepatic parenchyma. Blood cultures or culture of drained material identify bacteria such as Klebsiella pneumoniae, Escherichia coli, or Streptococcus. Elevated inflammatory markers and leukocytosis confirm active infectious process.
Scenario 2: Hepatic Amebiasis Patient with history of prior diarrhea or exposure to poor sanitary conditions develops pain in the right upper abdominal quadrant, fever, and malaise. Imaging studies reveal cystic lesion in the liver, serology for Entamoeba histolytica positive, and favorable response to specific treatment with metronidazole or tinidazole confirms the diagnosis.
Scenario 3: Hepatic Echinococcosis (Hydatid Cyst) Incidental or symptomatic identification of hepatic cyst in patient with history of exposure to dogs or endemic areas. Characteristic imaging on radiological studies showing cyst with daughter vesicles, positive serology for Echinococcus, and histopathological confirmation when applicable. May present with abdominal pain, palpable mass, or complications such as rupture.
Scenario 4: Hepatic Fascioliasis Patient presents with acute febrile syndrome with painful hepatomegaly, marked eosinophilia, and history of consumption of watercress or raw aquatic vegetables. Serological tests detect antibodies against Fasciola hepatica, and eggs may be identified in stool in the chronic phase. Symptoms include abdominal pain, nausea, and urticaria.
Scenario 5: Bacterial Cholangitis with Parenchymal Involvement Patient with biliary obstruction develops ascending infection with bacteremia, presenting with Charcot's triad (fever, jaundice, abdominal pain) or Reynolds' pentad (adding mental confusion and hypotension). Studies demonstrate dilation of biliary ducts, signs of systemic infection, and impairment of hepatic function.
Scenario 6: Fungal Hepatic Infection in Immunosuppressed Patients Transplant recipients, patients with advanced HIV, or those undergoing chemotherapy develop disseminated fungal infection with hepatic involvement. Hepatosplenic candidiasis or aspergillosis with hepatic lesions identified on imaging studies, confirmed by culture or biopsy, with elevation of hepatic enzymes and systemic manifestations.
4. When NOT to Use This Code
It is essential to recognize situations where DB90 is not appropriate, avoiding coding errors:
Classic Viral Hepatitis: When the diagnosis is hepatitis A, B, C, D, or E, specific codes from the category of infectious diseases should be used, not DB90. The presence of specific serological markers (HBsAg, anti-HCV, IgM anti-HAV) directs toward specific viral coding.
Alcoholic Liver Disease: Even if there is secondary infection, if the primary etiology is alcohol consumption with steatosis, alcoholic hepatitis, or cirrhosis, specific codes for alcoholic liver disease should take priority.
Non-Alcoholic Fatty Liver Disease: Accumulation of fat in the liver related to metabolic syndrome, obesity, or diabetes does not constitute an infectious process and should be coded as DB92.
Acute Liver Failure: When the predominant presentation is fulminant hepatic failure, regardless of initial etiology, DB91 may be more appropriate, especially if the initial infectious phase has already been overcome.
Established Cirrhosis: Even if prior infection was the cause, if the current diagnosis is established cirrhosis without active infectious process, DB93 is more appropriate.
Autoimmune Hepatitis: Inflammatory process of autoimmune nature should not be coded as infectious, even with elevated transaminases and similar symptoms.
Drug-Induced Liver Injury: Medication-induced hepatotoxicity does not constitute an infectious process and has specific coding.
Hepatic Metastases: Secondary lesions from neoplasms are not infectious processes, even when there is secondary infection, and should be coded primarily as neoplastic disease.
5. Step-by-Step Coding Process
Step 1: Assess Diagnostic Criteria
Confirm the presence of hepatic infectious process through:
Clinical Manifestations: Fever, right upper quadrant pain, hepatomegaly, jaundice, constitutional symptoms such as malaise, weight loss, and night sweats.
Laboratory Exams: Elevation of liver enzymes (ALT, AST), alkaline phosphatase and bilirubin; leukocytosis with left shift; elevated inflammatory markers (CRP, ESR); positive blood cultures or specific cultures; specific serologies for parasites.
Imaging Exams: Ultrasound, computed tomography, or magnetic resonance imaging demonstrating lesions suggestive of abscess, parasitic cyst, or infectious infiltration of hepatic parenchyma.
Microbiological Confirmation: Whenever possible, identify the etiologic agent through cultures, serologies, PCR, or histopathologic examination.
Step 2: Verify Specifiers
Etiologic Agent: Identify whether bacterial, parasitic, fungal, or other. Use complementary codes to specify the agent when known.
Location: Determine whether the involvement is diffuse parenchymatous, localized (single or multiple abscess), or involving intrahepatic bile ducts.
Severity: Assess extent of hepatic involvement, presence of complications (abscess rupture, bacteremia, septic shock), and degree of hepatic dysfunction.
Duration: Classify as acute (recent onset, intense symptoms) or chronic (prolonged course, insidious symptoms), which may influence therapeutic approach.
Step 3: Differentiate from Other Codes
DB91 - Acute or Subacute Hepatic Failure: Use DB91 when there is hepatic function failure with encephalopathy, severe coagulopathy, and imminent risk of death, even if initiated by infection. DB90 is for hepatic infection without established failure.
DB92 - Non-Alcoholic Fatty Liver Disease: Use DB92 when there is steatosis without infectious etiology, related to metabolic factors. The fundamental difference is absence of infectious agent and presence of metabolic risk factors.
DB93 - Hepatic Fibrosis or Cirrhosis: Use DB93 when the predominant diagnosis is advanced fibrosis or established cirrhosis, even if caused by prior infection. DB90 is for active infectious process, not for fibrotic sequela.
Step 4: Required Documentation
Checklist of Mandatory Information:
- Detailed description of symptoms and clinical signs
- Laboratory exam results with dates
- Imaging exam reports with description of lesions
- Results of cultures and serologies
- Etiologic agent when identified
- Antimicrobial treatment instituted
- Clinical course and therapeutic response
- Complications if present
- Procedures performed (drainage, biopsy)
Adequate Record: Clearly document "infectious hepatic disease due to [specific agent]" or "pyogenic hepatic abscess" or "hepatic amebiasis," facilitating accurate coding and subsequent audit.
6. Complete Practical Example
Clinical Case
A 52-year-old male patient, farmer, seeks medical care with a complaint of fever for 10 days, severe pain in the right upper quadrant of the abdomen, loss of appetite, and weight loss of 4 kg in the last month. He reports an episode of bloody diarrhea approximately 2 months ago, which improved spontaneously. Denies alcohol use or illicit drug use. On physical examination: compromised general condition, febrile (38.7°C), jaundiced (+/4+), painful hepatomegaly palpable 4 cm below the right costal margin, without signs of peritoneal irritation.
Initial Laboratory Tests:
- Leukocytes: 16,500/mm³ (neutrophilia)
- Hemoglobin: 11.2 g/dL
- ALT: 156 U/L
- AST: 189 U/L
- Alkaline phosphatase: 340 U/L
- Total bilirubin: 3.8 mg/dL (direct: 2.6 mg/dL)
- CRP: 145 mg/L
- Albumin: 2.9 g/dL
Abdominal Ultrasound: Hepatomegaly with rounded, hypoechoic lesion with irregular contours, measuring 8.5 cm in the right lobe, suggestive of hepatic abscess.
Computed Tomography: Confirmed cystic lesion with peripheral enhancement after contrast, hypodense content, located in hepatic segment VII, compatible with abscess.
Serology for Entamoeba histolytica: IgG and IgM positive.
Diagnostic Reasoning: Epidemiological history compatible (farmer, previous diarrhea), characteristic clinical presentation, typical image of hepatic abscess, and positive serology confirm the diagnosis of hepatic amebiasis (amebic abscess).
Step-by-Step Coding
Criteria Analysis:
- Confirmed hepatic infectious process: ✓
- Identified etiological agent (E. histolytica): ✓
- Documented structural lesion: ✓
- Not viral hepatitis: ✓
- No established hepatic insufficiency: ✓
Code Selected: DB90 - Infectious liver disease
Complete Justification: The patient presents with parasitic infection of the liver with formation of amebic abscess, confirmed by specific serology and characteristic imaging. This is not viral hepatitis (negative viral serologies), there is no acute hepatic insufficiency (no encephalopathy or severe coagulopathy), and the process is primarily infectious, not metabolic or cirrhotic. DB90 is the most appropriate code for this condition.
Complementary Codes: A specific code for Entamoeba histolytica may be added when the system allows greater granularity, specifying the etiological agent.
Instituted Treatment: Intravenous metronidazole followed by oral route, with excellent clinical response, fever resolution in 72 hours, and progressive reduction of the lesion on follow-up examinations.
7. Related Codes and Differentiation
Within the Same Category
DB91: Acute or Subacute Liver Failure
When to use DB91: Patient with fulminant hepatic failure, hepatic encephalopathy, severe coagulopathy (INR >1.5), intense jaundice and risk of imminent death. Even if initiated by infection, the dominant presentation is insufficiency.
When to use DB90: Hepatic infection without significant functional failure. Patient maintains preserved or only mildly compromised hepatic function, without encephalopathy.
Main difference: DB91 indicates organ failure with grave prognosis; DB90 indicates treatable infection without established failure.
DB92: Non-Alcoholic Fatty Liver Disease
When to use DB92: Hepatic steatosis in patient with metabolic syndrome, obesity, diabetes or dyslipidemia, without evidence of infectious process. Diagnosis by imaging or biopsy showing fat accumulation.
When to use DB90: Documented infectious process with identified or strongly suspected etiologic agent, regardless of coexisting steatosis.
Main difference: DB92 is metabolic disease; DB90 is infectious disease. Completely distinct etiologies.
DB93: Hepatic Fibrosis or Cirrhosis
When to use DB93: Patient with established cirrhosis, advanced fibrosis documented by biopsy or elastography, with signs of portal hypertension, ascites or chronic decompensation.
When to use DB90: Acute or chronic hepatic infection without established cirrhosis, or when active infectious process is the predominant diagnosis.
Main difference: DB93 represents permanent structural sequela; DB90 represents potentially reversible infectious process.
Differential Diagnoses
Hepatocarcinoma: Hepatic lesions in cirrhotic patient or with elevated alpha-fetoprotein suggest neoplasia, not infection. Imaging pattern and biopsy differentiate.
Acute Cholecystitis: Pain in right hypochondrium may be confused, but ultrasonography differentiates inflamed gallbladder from hepatic parenchymal lesion.
Acute Pancreatitis: Upper abdominal pain with elevation of amylase and lipase, without focal hepatic lesion, distinguishes from hepatic infection.
8. Differences with ICD-10
In ICD-10, hepatic infections were coded in a less specific manner, frequently using K75.0 (Hepatic abscess) or codes for specific infections with extension for hepatic involvement. The granularity was lower and the categorization less systematic.
Equivalent ICD-10 Code: K75.0 (Hepatic abscess) was the closest, but did not comprehensively cover all hepatic infections.
Main Changes in ICD-11:
ICD-11 introduces DB90 as a broader and more inclusive category, allowing coding of various infectious etiologies of the liver under a unified code, facilitating epidemiological analyses. The improved hierarchical structure allows more intuitive navigation and more efficient data retrieval. The possibility of adding complementary codes to specify etiological agents offers greater diagnostic precision without compromising the simplicity of basic coding.
Practical Impact: Healthcare professionals find the appropriate code more easily in ICD-11, reducing coding errors. Health information systems can generate more accurate reports on infectious hepatic diseases. The transition requires training, but results in better data quality and improved international comparability.
9. Frequently Asked Questions
How is infectious liver disease diagnosed?
Diagnosis combines clinical, laboratory, and radiological evaluation. Clinically, fever, localized abdominal pain, hepatomegaly, and constitutional symptoms are sought. Laboratory workup includes complete blood count, liver function tests, inflammatory markers, and specific serologies based on suspected etiology. Imaging studies such as ultrasound, computed tomography, or magnetic resonance imaging are essential for identifying structural lesions. When possible, microbiological confirmation through blood cultures, culture of drained material, or specific serologies establishes definitive diagnosis.
Is treatment available in public health systems?
Yes, treatments for hepatic infections are generally available in public health systems. Antibiotics for bacterial infections, antiparasitic agents for amebiasis and other parasitic infections, and antifungal agents for fungal infections are part of essential medication lists. Procedures such as percutaneous drainage of abscesses can be performed in hospitals with adequate infrastructure. Access may vary depending on local resources and case complexity.
How long does treatment last?
Duration varies depending on etiology and severity. Bacterial abscesses require antibiotic therapy for 4 to 6 weeks, often starting intravenously and completing orally. Hepatic amebiasis is treated with metronidazole for 7 to 10 days, followed by a luminal agent. Echinococcosis may require prolonged treatment with albendazole for months, sometimes combined with surgery. Fungal infections in immunosuppressed patients frequently require prolonged therapy until complete resolution and immune recovery.
Can this code be used in medical certificates?
Yes, DB90 can be used in medical certificates when appropriate, documenting the condition that justifies work absence. Infectious liver diseases frequently cause temporary disability due to systemic symptoms, pain, and need for hospital treatment. Duration of absence should be individualized according to severity, therapeutic response, and type of professional activity of the patient.
What complications can occur?
Complications include abscess rupture with peritonitis, bacteremia and sepsis, formation of multiple abscesses, extension to adjacent structures, development of fistulas, hepatic insufficiency in severe cases, and chronicity with hepatic fibrosis. Echinococcosis may be complicated by cyst rupture and anaphylactic reaction. Early recognition and appropriate treatment minimize risks.
Is it possible to prevent infectious liver diseases?
Prevention involves hygiene measures, adequate sanitation, water treatment, appropriate food cooking, avoiding consumption of raw vegetables in endemic areas, vector and animal reservoir control, vaccination when available, and precautions when traveling to risk areas. In immunosuppressed patients, antimicrobial prophylaxis may be indicated according to protocol.
What is the difference between pyogenic and amebic abscess?
Pyogenic abscess is caused by bacteria, usually polymicrobial or by enteric organisms, frequently secondary to abdominal infection or bacteremia. It presents with high fever, intense leukocytosis, and purulent content. Amebic abscess is caused by Entamoeba histolytica, usually single in the right lobe, with "chocolate-colored" content, associated with positive serology and suggestive epidemiological history. Treatment differs: bactericidal antibiotics for pyogenic, antiparasitic agents for amebic.
When is hepatic abscess drainage necessary?
Percutaneous or surgical drainage is indicated when the abscess is large (usually >5 cm), does not respond adequately to clinical treatment within 48-72 hours, presents risk of rupture, or when diagnostic confirmation through culture of material is needed. Small abscesses frequently respond to antimicrobial treatment alone. The decision is individualized considering size, location, number of lesions, and patient's clinical condition.
Conclusion
Appropriate coding of infectious liver diseases using DB90 in ICD-11 is fundamental for accurate documentation, epidemiological analysis, and appropriate clinical management. Understanding when to apply this code, differentiating it from similar conditions, and documenting appropriately ensures quality in patient care and integrity of health information systems. Recognition of the diverse infectious etiologies affecting the liver, from bacterial to parasitic and fungal infections, allows for targeted diagnostic and therapeutic approach, improving clinical outcomes and reducing complications.
External References
This article was prepared based on reliable scientific sources:
- 🌍 WHO ICD-11 - Infectious liver disease
- 🔬 PubMed Research on Infectious liver disease
- 🌍 WHO Health Topics
- 📊 Clinical Evidence: Infectious liver disease
- 📋 Ministry of Health - Brazil
- 📊 Cochrane Systematic Reviews
References verified on 2026-02-03