Clinical Context
A 42-year-old patient with chronic hepatitis B infection presents for evaluation of worsening liver enzymes and new onset fatigue. The clinician orders a quantitative hepatitis D viral load to determine active hepatitis D virus (HDV) replication because HDV only occurs with hepatitis B virus (HBV) co-infection and can accelerate liver injury. A phlebotomy technician collects a blood specimen in an appropriate viral transport tube; the specimen is sent to a molecular diagnostics laboratory. In the lab, a nucleic acid amplification test using a DNA/RNA probe quantifies HDV RNA and reports viral load in international units per milliliter. Results are provided to the ordering provider and placed in the medical record to guide disease staging and antiviral or referral decisions.
Coding Specifications
| Modifier | Description | When to Use |
|---|
26 | Professional component | When billing only the professional interpretation portion if the laboratory separates professional and technical components. |
52 | Reduced services | When the test is partially performed or abbreviated and the full service was not completed for documented reasons.
53 | Discontinued procedure | When specimen collection or testing was started but discontinued due to patient or technical reasons.
59 is not in the provided modifiers; therefore, no use is listed.
62 | Two surgeons | Not typically applicable to this laboratory test; included rarely if dual-surgeon operative care is billed alongside procedures resulting in testing.
78 | Unplanned return to OR following initial procedure | Not typically applicable to the laboratory test itself; used in surgical contexts that may trigger repeat testing.
80 | Assistant surgeon | Not typically applicable to this lab procedure; included for completeness when surgical services are billed concurrently.
90 | Reference (outside) laboratory | When the specimen is sent to an outside reference lab and the billing must indicate testing performed by another laboratory.
AS | Physician assistant, nurse practitioner, or clinical nurse specialist services for Medicare | When these clinician types order or bill for associated specimen collection services under Medicare rules.
TC | Technical component | When billing only the laboratory technical component (equipment, reagents, and processing) if separated from the professional component.
QK | Medical direction of two, three, or four concurrent anesthesia procedures | Not applicable to the lab test; not used for molecular diagnostic billing.
QX | CRNA service with medical direction | Not applicable to the lab test; not used for molecular diagnostic billing.
QY | Medical direction of one CRNA by an anesthesiologist | Not applicable to the lab test; not used for molecular diagnostic billing.
| Taxonomy Code | Specialty | Notes |
|---|
207RH0000X | Infectious Disease | ID physicians order, interpret, and manage viral hepatitis including HDV testing. |
207L00000X | Gastroenterology | Gastroenterologists monitor and manage chronic hepatitis and order viral load testing.
207Q00000X | Hepatology | Hepatologists specialize in liver disease management and use HDV viral load for staging and therapy decisions.
208000000X | Pathology & Laboratory Medicine | Laboratory physicians and directors oversee molecular diagnostic testing and result validation.
363L00000X | Clinical Laboratory Scientist | Laboratory professionals perform nucleic acid testing and report quantitative viral loads.
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|
B16.9 | Hepatitis B acute without delta-agent | Acute hepatitis B can allow HBV testing; HDV testing is only indicated if HBV infection is present. |
B18.1 | Chronic viral hepatitis B without delta-agent | Chronic HBV infection is the required substrate for HDV co-infection; viral load measurement helps assess HDV activity.
B17.0 | Delta-agent hepatitis [hepatitis D] | Direct diagnosis indicating HDV infection; quantitative RNA testing confirms active replication and guides management.
K75.9 | Inflammatory liver disease, unspecified | Used when liver inflammation is present and etiology is being determined; HDV testing helps clarify viral causes.
K74.60 | Unspecified cirrhosis of liver | Advanced liver disease in patients with HBV/HDV co-infection; HDV viral load can influence staging and transplant evaluation.
R16.0 | Hepatomegaly | Clinical finding that may prompt evaluation for viral hepatitis including HDV in the setting of HBV infection.
R17 | Unspecified jaundice | Jaundice is a common manifestation of viral hepatitis; HDV testing is indicated in HBV-positive patients with worsening jaundice.
Z22.51 | Carrier of hepatitis B virus | HBV carriers should be evaluated for HDV if clinical deterioration occurs; RNA testing distinguishes active HDV replication.
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|
87523 | Using a nucleic acid (DNA or RNA) probe technique, the test quantifies the level of hepatitis D (delta) viral particles in the patient specimen, called viral load. | Primary procedure: quantifies HDV RNA to assess active infection in patients with hepatitis B co-infection. |
87622 | Infectious agent detection by nucleic acid (DNA or RNA); hepatitis C virus, amplified probe technique. | Related molecular viral load testing for hepatitis C performed in similar molecular workflows when evaluating viral hepatitis etiologies.
87340 | Hepatitis B virus surface antigen (HBsAg) test. | Often performed alongside HDV testing to confirm current hepatitis B infection required for HDV presence.
87491 | Infectious agent antigen detection by immunoassay technique; hepatitis C, acute. | Immunoassay tests for hepatitis viruses may be ordered in the diagnostic evaluation panel with molecular tests.
86704 | Hepatitis B core antibody (anti-HBc) serologic test. | Serologic markers for HBV (core antibody) are commonly used in initial evaluation and to interpret HDV results.
86403 | Hepatitis D virus antibody, total (HDV Ab). | Serologic screening for HDV antibody can precede or accompany nucleic acid testing to establish exposure and guide RNA testing.
80061 | Lipid panel (cholesterol, HDL, triglycerides) — example metabolic test. | Not directly related to HDV testing but commonly ordered in liver disease management for baseline metabolic risk assessment.
82270 | Bilirubin, total. | Liver function tests such as bilirubin are commonly ordered concurrently to assess hepatic injury in patients with viral hepatitis.
84460 | Thyroid stimulating hormone (TSH). | Routine labs sometimes included in comprehensive evaluations but not specific to HDV testing.
80053 | Comprehensive metabolic panel. | Standard panel to evaluate hepatic and renal function when assessing patients with chronic viral hepatitis.